October 22, 2003 H.J. Krebs 1

LST Mechanical Design Review

2004 IR-2 Installation Schedule

H.J. Krebs

October 22, 2003

October 22, 2003 H.J. Krebs 2

2004 Installation• Scope of work is located on top & bottom

sextants– Remove 18 layers of RPCs– Install 6 layers of 7/8” thick brass absorber in

layers 5,7,9,11,13 & 15 – 11.5 tons/sextant– Install LST detectors in layers

1,2,3,4,6,8,10,12,14,16,17 & 18– An investigation will be performed at

commencement of this down to determine if the layer 19 RPC can be retained at some functioning level

October 22, 2003 H.J. Krebs 3

2004 Installation• Schedules do not include any time for:

– Post and pre-run PEP survey work• In the past, this has been 2.5 to 3 work days

– PPS certification• In the past, this has been 4 days

– Tours and photography sessions• In 2002, we lost two days to this• If tours or photography sessions are important, they may

occur between midnight and 07:00

– LST commissioning• 15 work days for bottom sextant• 2 work days for top sextant

– Replacement of any LST detectors that have problems after installation

October 22, 2003 H.J. Krebs 4

2004 Installation• Flux return steel

– Side gap plates• Have removed many times• Very confident in schedule for these tasks

– Center gap plates• Have never removed before• Very confident in schedule for these tasks

– Corner plates• Have never removed before• Schedule times for these tasks are an educated guess• Test removal of two corner block bolts in summer 2003

– Somewhat easy to remove– Bolt threads appear to be in excellent condition

• An unbolting/bolting sequence needs to be developed– Assume torquing these bolts 3 times during reinstallation

– Helicoils• Have had trouble with these in the past• Assume a problem with 1% of helicoils

– Means replacing two helicoils in 2004– There is no time included in the schedule for helicoil replacement

» Probably a few hours per helicoil replacement

October 22, 2003 H.J. Krebs 5

2004 Installation• Steel position

– Shall be monitored to assure that the barrel assembly is stable

– Some early thoughts on this• Dial indicators at strategic locations• Survey targets added at strategic locations

– i.e., on mid corner blocks to see if structure is becoming egg shaped

• Take periodic measurements– At beginning for reference– After bolts are loosened on each corner plate– At the beginning of each day– At the beginning of second shift– At the end of each day– At end for final reference

October 22, 2003 H.J. Krebs 6

2004 Installation• RPC removal

– RPCs are “ripped” out• HV & gas line still connected on BWD end• Time may be lost cleaning the steel gaps of this debris

– Bottom RPCs must be ripped loose, then cut, then pulled, then cut, etc.

• Not enough space in Z to extract in one piece

– RPCs range in weight from approximately 150 pounds for layer 1 to 250 pounds for layer 18

– 3600 sq ft of RPCs will be removed– Cover FWD beamline and detector face for protection

October 22, 2003 H.J. Krebs 7

2004 Installation• Where do items go during the installation process?

– Flux return steel to IR-12– Flux return bolts

• There are approximately 232 bolts 1-1/2”-6UNC x 14” lg.• Need to keep track of these• Need to protect threads

– Platforms and walkways along service road to Building 611– Main shield wall blocks along the Loop Road– RPCs thrown out in the IR-2 parking lot

• Where do items come from during the installation process?– Steel handling fixtures from IR-12– Elevator platforms from IR-12– Brass absorber plates from IR-12– LST detectors from SLD Collider Hall– Electronics and gas system from SLD Collider Hall

October 22, 2003 H.J. Krebs 8

2004 Installation• Schedules are based on:

– Mechanical installation assumes two 8-hour shifts per day, six days per week (3rd,6th and last week one 10-hour shift) – very taxing

– LST installation assumes one 10-hour shift per day, six days per week

• Mechanical installation team will provide support to LST team during this period and will also work one 10-hour shift per day, six days per week

– Wireway installation, cabling and gas hookup will be performed on owl shift

– Installation schedules denote IFR/LST work only• Work by other systems must be performed during owl shift

October 22, 2003 H.J. Krebs 9

Hall Crew Actual Work Time (Two 8-hour Shifts)Days Actual Work Time

0.05 39 minutes

0.1 1 hour 18 minutes

0.15 1 hour 57 minutes

0.2 2 hours 36 minutes

0.25 3 hours 15 minutes

0.3 3 hours 54 minutes

0.35 4 hours 33 minutes

0.4 5 hours 12 minutes

0.45 5 hours 51 minutes

0.5 6 hours 30 minutes

0.55 7 hours 9 minutes

0.6 7 hours 48 minutes

0.65 8 hours 27 minutes

0.7 9 hours 6 minutes

0.75 9 hours 45 minutes

0.8 10 hours 24 minutes

0.85 11 hours 3 minutes

0.9 11 hours 42 minutes

0.95 12 hours 21 minutes

1 13 hours

October 22, 2003 H.J. Krebs 10

Hall Crew Actual Work Time (One 10-hour Shift)Days Actual Work Time

0.05 23 minutes

0.1 47 minutes

0.15 1 hour 10 minutes

0.2 1 hour 33 minutes

0.25 1 hour 56 minutes

0.3 2 hours 20 minutes

0.35 2 hours 43 minutes

0.4 3 hours 6 minutes

0.45 3 hours 29 minutes

0.5 3 hours 53 minutes

0.55 4 hours 16 minutes

0.6 4 hours 39 minutes

0.65 5 hours 2 minutes

0.7 5 hours 26 minutes

0.75 5 hours 49 minutes

0.8 6 hours 12 minutes

0.85 6 hours 36 minutes

0.9 6 hours 59 minutes

0.95 7 hours 22 minutes

1 7 hours 45 hours

October 22, 2003 H.J. Krebs 11

2004 Installation Schedule

ID Task Name Duration Start Finish Predecessors

209 SUMMER DOWN 2004 57.75 days 7/1/04 9/8/04210 Begin Summer Down 0 days 7/1/04 7/1/04

211 OPEN DETECTOR (Two 8-hour Shifts) 2 days 7/1/04 7/2/04212 Open IR-2 Curtain Wall 0.1 days 7/1/04 7/1/04 210

213 Open FWD End Door - East 0.1 days 7/1/04 7/1/04 212

214 Install EQ Brace - FWD Lwr East 0.15 days 7/1/04 7/1/04 213

215 Insert Manlift 1 - FWD East 0.05 days 7/1/04 7/1/04 214

216 Install EQ Brace - FWD Upr East 0.1 days 7/1/04 7/1/04 215

217 Open Fwd End Door - West 0.1 days 7/1/04 7/1/04 216

218 Install EQ Brace - FWD Lwr West 0.15 days 7/1/04 7/1/04 217

219 Install EQ Brace - FWD Upr West 0.1 days 7/1/04 7/1/04 218

220 Remove DIRC Cyl, Lead and BWD End plug 0.25 days 7/1/04 7/2/04 219

221 Transport DIRC Cyl, Lead and BWD End Plug to IR-12 0.1 days 7/2/04 7/2/04 220

222 Open BWD End Door - West 0.1 days 7/2/04 7/2/04 221

223 Install EQ Brace - BWD Lwr West 0.15 days 7/2/04 7/2/04 222

224 Insert Manlift 2 - BWD West 0.05 days 7/2/04 7/2/04 223

225 Install EQ Brace - BWD Upr West 0.1 days 7/2/04 7/2/04 224

226 Open BWD End Door - East 0.1 days 7/2/04 7/2/04 225

227 Install EQ Brace - BWD Lwr East 0.15 days 7/2/04 7/2/04 226

228 Insert Manlift 3 - BWD East 0.05 days 7/2/04 7/2/04 227

229 Install EQ Brace - BWD Upr East 0.1 days 7/2/04 7/2/04 228

230 Detector Open and EQ Braced 0 days 7/2/04 7/2/04 229

7/1

BBR,HC,Crane

BBR,HC,FE

BBR,HC,Crane,FE

BBR,HC,Crane,FE

BBR,HC,Crane,FE

BBR,HC,FW

BBR,HC,Crane,FW

BBR,HC,Crane,FW

BBR,HC,Crane,BC

BBR,HC,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,BE

BBR,HC,Crane,BE

BBR,HC,Crane,BE

BBR,HC,Crane,BE

7/2

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 12

Open FWD and BWD End Doors

October 22, 2003 H.J. Krebs 13

Install EQ Braces & Remove IFR Cooling Loops

Earthquaqe blocks are installed with shims.

Earthquaqe blocks

October 22, 2003 H.J. Krebs 14

2004 Installation ScheduleID Task Name Duration Start Finish Predecessors

231 PREP TO REMOVE STEEL (Two 8-Hour Shifts) 6.4 days 7/1/04 7/9/04232 IFR WORK (Owl Shift) 3.2 days 7/1/04 7/6/04233 Shut Off & Drain IFR Barrel Cooling System 0.25 days 7/1/04 7/1/04 210

234 Remove IFR HV Boxes - Upr FWD East & Upr FWD West 0.5 days 7/1/04 7/2/04 219

235 Remove Barrel FECs - FWD Top & Bottom 0.25 days 7/3/04 7/3/04 257

236 Disconnect Gas, HV & Remove Lines/Cables/Wireways - FWD Top & Bottom 0.25 days 7/3/04 7/3/04 235

237 Remove Barrel FECs - BWD Top & Bottom 0.25 days 7/3/04 7/3/04 236

238 Disconnect Gas, HV & Remove Lines/Cables/Wireways - BWD Top & Bottom 0.25 days 7/3/04 7/6/04 237

239 RELEASE SOLENOID SUPPORTS (Day Shift) 1.2 days 7/3/04 7/6/04240 Unbolt Solenoid External Axial Support Rods - Upr FWD East & Upr FWD West 0.25 days 7/3/04 7/3/04 230

241 Remove Solenoid Radial Support Arm - FWD Upr East 0.1 days 7/3/04 7/3/04 240

242 Remove Solenoid Radial Support Arm - FWD Upr West 0.1 days 7/3/04 7/3/04 241

243 Release Solenoid External Radial Wedge Support - FWD Upr East 0.05 days 7/3/04 7/3/04 242

244 Release Solenoid External Radial Wedge Support - FWD Upr West 0.05 days 7/3/04 7/3/04 243

245 Release Solenoid External Radial Wedge Support - BWD Upr East 0.05 days 7/3/04 7/3/04 244

246 Release Solenoid External Radial Wedge Support - BWD Upr West 0.05 days 7/3/04 7/3/04 245

247 Unbolt Solenoid External Axial Support Rods - Lwr East & Lwr West 0.25 days 7/3/04 7/3/04 246

248 Remove Solenoid Radial Support Arm - FWD Lwr East 0.1 days 7/3/04 7/3/04 247

249 Remove Solenoid Radial Support Arm - FWD Lwr West 0.1 days 7/6/04 7/6/04 248

250 Transport Solenoid Radial Support Arms to IR-12 0.1 days 7/6/04 7/6/04 249

251 Solenoid Supports Released 0 days 7/6/04 7/6/04 250

252 REMOVE SHIELDING (Day Shift) 3 days 7/6/04 7/9/04253 Disassemble Shield Wall Blocks 2 days 7/6/04 7/8/04 251

254 Remove FWD IFR Background Shield Wall 1 day 7/8/04 7/9/04 253

255 MISCELLANEOUS PREP WORK (Swing Shift) 4.4 days 7/3/04 7/9/04256 Remove FWD Upr & Lwr Ctr Cooling Loops & Hoses 0.1 days 7/3/04 7/3/04 230

257 Remove BWD Upr & Lwr Ctr Cooling Loops & Hoses 0.1 days 7/3/04 7/3/04 256

258 Drill & Tap FWD Door Tracks 0.5 days 7/3/04 7/3/04 257

259 Modify FWD PEP Pier Platforms 0.5 days 7/3/04 7/6/04 258

260 Remove FWD GAP Filler Plates - Transport to IR-12 0.5 days 7/6/04 7/6/04 259

261 Cover FWD Barrel Face & FWD Beamline 0.5 days 7/6/04 7/7/04 260

262 Install Steel Position Dial Indicators & Survey Targets 0.25 days 7/7/04 7/7/04 261

263 Remove Lower West Electronics House Walkway - Take to Shop 0.1 days 7/9/04 7/9/04 254,262

264 Install Upper Electronics House to East Detector Stairway 0.1 days 7/9/04 7/9/04 263

BBR,IFR

BBR,IFR,FC

BBR,IFR,FC

BBR,IFR,FC

BBR,IFR,BC

BBR,IFR,BC

BBR,HC,CRYO,FE,FW

BBR,HC,CRYO,Crane,FE

BBR,HC,CRYO,Crane,FW

BBR,HC,CRYO,FE

BBR,HC,CRYO,FW

BBR,HC,CRYO,FE,FW

BBR,HC,CRYO,Crane,FE

BBR,HC,CRYO,Crane,FW

7/6

BBR,HC,RIG,Crane

BBR,HC,Crane,FC

BBR,HC,FC

BBR,HC,Crane,FE,FW

BBR,HC

BBR,HC

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 15

Install Beam Line Protection, Remove Solenoid Support Arms

Beam pipe protection can interfere with the man lift.

October 22, 2003 H.J. Krebs 16

2004 Installation Schedule

ID Task Name Duration Start Finish Predecessors

265 REMOVE STEEL (Two 8-hour Shifts) 2.45 days 7/9/04 7/12/04266 Remove Upr FWD Center Gap Plate - Transport to IR-12 0.15 days 7/9/04 7/9/04 264

267 Remove Corner Plate F1 - Transport to IR-12 0.4 days 7/9/04 7/9/04 266

268 Record Steel Movement 0.05 days 7/9/04 7/9/04 267

269 Remove Corner Plate F6 - Transport to IR-12 0.4 days 7/9/04 7/10/04 267

270 Record Steel Movement 0.05 days 7/10/04 7/10/04 269

271 Remove Flux Bar - FWD Top - Transport to IR-12 0.2 days 7/10/04 7/10/04 269

272 Remove Lwr FWD Center Gap Plate - Transport to IR-12 0.2 days 7/10/04 7/10/04 271

273 Remove Corner Plate F3 - Transport to IR-12 0.4 days 7/10/04 7/12/04 272

274 Record Steel Movement 0.05 days 7/12/04 7/12/04 273

275 Remove Corner Plate F4 - Transport to IR-12 0.4 days 7/12/04 7/12/04 273

276 Record Steel Movement 0.05 days 7/12/04 7/12/04 275

277 Remove Flux Bar - FWD Bottom - Transport to IR-12 0.25 days 7/12/04 7/12/04 276

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC

BBR,HC,Crane,FW

BBR,HC

BBR,HC,Crane,FC

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC

BBR,HC,Crane,FW

BBR,HC

BBR,HC,Crane,FC

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 17

Remove Gap Plates, Upper Corner Blocks & Upper Flux Bar

October 22, 2003 H.J. Krebs 18

Remove Lower Corner Blocks & Lower Flux BarInstall Elevator Platform, Begin Brass Absorber and LST Installation

October 22, 2003 H.J. Krebs 19

2004 Installation ScheduleID Task Name Duration Start Finish Predecessors

278 BOTTOM SEXTANT DETECTOR REPLACEMENT 19.45 days 7/12/04 8/4/04279 (Two 8-hour Shifts) 0 days 7/12/04 7/12/04 277

280 Transport Lower Vertical Positioner Components to IR-2 0.1 days 7/12/04 7/12/04 277

281 Install Lower General Fixture Vertical Positioner 0.25 days 7/12/04 7/13/04 280

282 Transport RPC Removal Hardware to IR-2 0.1 days 7/13/04 7/13/04 281

283 Remove 18 Layers of RPCs & Dispose (2hr 53min/layer)(Pull & Cut) 4 days 7/13/04 7/17/04 282

284 Deliver LST Modules to IR-2 0.15 days 7/17/04 7/17/04 283

285 Install 12 Layers of LSTs (7hr 30min/layer) (One 10-hour Shift) 9 days 7/17/04 7/28/04 284

286 Transport Bottom Brass Absorber Plates to IR-2 (84 Plates) 0.1 days 7/28/04 7/28/04 285

287 Install 6 Layers of Brass Absorber - Bottom (51min/plate) 5.5 days 7/28/04 8/4/04 286

288 Bottom Sextant LSTs & Brass Absorber Installed 0 days 8/4/04 8/4/04 287

289 Remove Lower General Fixture Vertical Positioner - Transport to IR-12 0.25 days 8/4/04 8/4/04 288

290 SCHEDULE STATUS - DO WE PROCEED? 0 days 8/4/04 8/4/04 289291 TOP SEXTANT DETECTOR REPLACEMENT 15.7 days 8/4/04 8/21/04292 (Two 8-hour Shifts) 0 days 8/4/04 8/4/04 290

293 Transport Upper Vertical Positioner Components to IR-2 0.1 days 8/4/04 8/4/04 290

294 Install Upper General Fixture Vertical Positioner 0.25 days 8/4/04 8/4/04 293

295 Remove 18 Layers of RPCs & Dispose - Top (1hr 48min/lyr) 2.5 days 8/4/04 8/7/04 294

296 Transport RPC removal Hardware to IR-12 0.1 days 8/7/04 8/7/04 295

297 Deliver LST Modules to IR-2 0.15 days 8/7/04 8/7/04 296

298 Install 12 Layers of LSTs (6hr 40 min/lyr) (One 10-hour Shift) 8 days 8/7/04 8/17/04 297

299 Transport Top Brass Absorber Plates to IR-2 (84 Plates) 0.1 days 8/17/04 8/17/04 298

300 Install 6 Layers of Brass Absorber - Top (42min/plate) 4.5 days 8/17/04 8/21/04 299

301 Top Sextant LSTs & Brass Absorber Installed 0 days 8/21/04 8/21/04 300

7/12

BBR,HC,Crane,FC

BBR,HC,Crane,FC,BE,BW

BBR,HC,LST,Crane,FC,BE,BW

BBR,HC,Crane,FC,BE,BW

8/4

BBR,HC,Crane,FC

8/4

8/4

BBR,HC,Crane,FC

BBR,HC,Crane,FC,BE,BW

BBR,HC,LST,Crane,FC,BE,BW

BBR,HC,Crane,FC,BE,BW

8/21

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 20

2004 Installation

October 22, 2003 H.J. Krebs 21

2004 Installation Schedule

ID Task Name Duration Start Finish Predecessors

302 LST CABLING, HV & GAS (Owl Shift) 26.95 days 7/28/04 8/28/04303 Install Wireways and Connect Signal Cabling - Bottom FWD 2 days 7/28/04 7/30/04 285

304 Install HV Cabling - Bottom FWD 1 day 7/30/04 7/31/04 303

305 Install/Connect Gas Lines - Bottom FWD 1 day 7/31/04 8/2/04 304

306 Install Wireways and Connect Signal Cabling - Bottom BWD 2 days 8/2/04 8/4/04 305

307 Install/Connect HV Cabling - Bottom BWD 1 day 8/4/04 8/5/04 306

308 Install/Connect Gas Lines - Bottom BWD 1 day 8/5/04 8/6/04 307

309 Bottom LSTs Connected With Cabling, HV & Gas 0 days 8/6/04 8/6/04 308

310 Install Wireways and ConnectSignal Cabling - Top FWD 2 days 8/17/04 8/19/04 298

311 Install/Connect HV Cabling - Top FWD 1 day 8/19/04 8/20/04 310

312 Install/Connect Gas Lines - Top FWD 1 day 8/20/04 8/21/04 311

313 Install Wireways and Connect Signal Cabling - Top BWD 2 days 8/21/04 8/24/04 312

314 Install/Connect HV Cabling - Top BWD 1 day 8/24/04 8/25/04 313

315 Install/Connect Gas Lines - Top BWD 1 day 8/25/04 8/26/04 314

316 Top LSTs Connected With Cabling, HV & Gas 0 days 8/26/04 8/26/04 315

317 LST System Commissioning - Bottom 15 days 8/6/04 8/24/04 309

318 LST System Commissioning - Top 2 days 8/26/04 8/28/04 316

319 Remove Upper General Fixture Vertical Positioner - Transport to IR-12 0.5 days 8/26/04 8/26/04 316

BBR,LST,FC

BBR,LST,FC

BBR,LST,FC

BBR,LST,BE,BW

BBR,LST,BE,BW

BBR,LST,BE,BW

8/6

BBR,LST,FC

BBR,LST,FC

BBR,LST,FC

BBR,LST,BE,BW

BBR,LST,BE,BW

BBR,LST,BE,BW

8/26

BBR,LST

BBR,HC,Crane,FC

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 22

2004 Installation ScheduleID Task Name Duration Start Finish Predecessors

320 INSTALL STEEL (Two 8-hour Shifts) 4.2 days 8/26/04 9/1/04321 INSTALL LOWER STEEL 1.75 days 8/26/04 8/28/04322 Deliver FWD Bottom Flux Bar to IR-2 - Install 0.25 days 8/26/04 8/27/04 319

323 Deliver Corner Plate F3 to IR-2 - Install 0.5 days 8/27/04 8/27/04 322

324 Torque Corner Plate Bolts - F3 0.5 days 8/27/04 8/28/04 323

325 Deliver Corner Plate F4 to IR-2 - Install 0.5 days 8/27/04 8/28/04 323

326 Torque Corner Plate Bolts - F4 0.5 days 8/28/04 8/28/04 325

327 Deliver LWR Center Gap Plate to IR-2 - Install 0.15 days 8/28/04 8/28/04 325

328 Deliver Lwr FWD Gap Plates to IR-2 0.05 days 8/28/04 8/28/04 327

329 Install Lwr FWD Gap Filler Plates 0.25 days 8/28/04 8/28/04 328

330 INSTALL UPPER STEEL 1.7 days 8/28/04 8/31/04331 Deliver FWD Top Flux Bar to IR-2 - Install 0.2 days 8/28/04 8/28/04 329,319

332 Deliver Corner Plate F1 to IR-2 - Install 0.5 days 8/28/04 8/30/04 331

333 Torque Corner Plate Bolts - F1 0.5 days 8/30/04 8/30/04 332

334 Deliver Corner Plate F6 to IR-2 - Install 0.5 days 8/30/04 8/30/04 332

335 Torque Corner Plate Bolts - F6 0.5 days 8/30/04 8/31/04 334

336 Deliver UPR FWD Center Gap Plate to IR-2 - Install 0.15 days 8/30/04 8/30/04 334

337 Deliver Upr FWD Gap Plates to IR-2 0.05 days 8/30/04 8/30/04 336

338 Install Upr FWD Gap Filler Plates 0.25 days 8/31/04 8/31/04 337

339 Flux Return Steel Assembled 0 days 8/31/04 8/31/04 338

340 MISCELLANEOUS WORK 0.2 days 8/31/04 8/31/04341 Record Final Steel Movement 0.05 days 8/31/04 8/31/04 339

342 Remove Steel Position Dial Indicators 0.05 days 8/31/04 8/31/04 341

343 Remove FWD Detector Cover & FWD Beamline Cover 0.1 days 8/31/04 8/31/04 342

344 IFR WORK 0.65 days 8/31/04 9/1/04345 Install IFR Cooling Loops/Connect Hoses - FWD Bottom 0.1 days 8/31/04 8/31/04 343

346 Install IFR Cooling Loops/Connect Hoses - FWD Top 0.1 days 8/31/04 8/31/04 345

347 Install IFR Cooling Loops/Connect Hoses - BWD Top 0.1 days 8/31/04 8/31/04 346

348 Install IFR Cooling Loops/Connect Hoses - BWD Bottom 0.1 days 8/31/04 8/31/04 347

349 Fill and Start IFR Barrel Cooling System 0.25 days 8/31/04 9/1/04 348

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FE,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FE,FW

8/31

BBR,HC

BBR,HC

BBR,HC

BBR,HC,FC

BBR,HC,FC

BBR,HC,BE,BW

BBR,HC,BE,BW

BBR,IFR

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 23

2004 Installation Schedule

ID Task Name Duration Start Finish Predecessors

350 PREP FOR DETECTOR CLOSE-UP (One 10-hour Shift) 4.15 days 8/31/04 9/4/04351 ADJUST SOLENOID SUPPORTS 1.2 days 8/31/04 9/1/04352 Deliver Solenoid Radial Support Arms to IR-2 0.1 days 8/31/04 8/31/04 339

353 Install Solenoid Radial Support Arm - FWD Lwr West 0.1 days 8/31/04 8/31/04 352,338

354 Install Solenoid Radial Support Arm - Fwd Lwr East 0.1 days 8/31/04 8/31/04 353

355 Connect and Tension Solenoid External Axial Support Rods - Lwr FWD West & Lwr Fwd East 0.25 days 8/31/04 8/31/04 354

356 Adjust Solenoid External Radial Support Wedge - Upr Fwd West 0.05 days 8/31/04 8/31/04 355

357 Adjust Solenoid External Radial Support Wedge - Upr FWD East 0.05 days 8/31/04 8/31/04 356

358 Adjust Solenoid External Radial Support Wedge - Upr Bwd East 0.05 days 8/31/04 8/31/04 357

359 Adjust Solenoid External Radial Support Wedge - Upr Bwd West 0.05 days 9/1/04 9/1/04 358

360 Install Solenoid Radial Support Arm - Upr FWD West 0.1 days 9/1/04 9/1/04 359

361 Install Solenoid Radial Support Arm - Upr FWD East 0.1 days 9/1/04 9/1/04 360

362 Connect and Tension Solenoid External Axial Support Rods - Upr Fwd West & Upr Fwd East 0.25 days 9/1/04 9/1/04 361

363 Solenoid Supports Adjusted 0 days 9/1/04 9/1/04 362

364 INSTALL SHIELDING 3.2 days 9/1/04 9/4/04365 Install FWD IFR Background Shield Wall 1 day 9/1/04 9/2/04 361

366 Install Shielding in Shield Wall Cable Tray Opening 1 day 9/1/04 9/2/04 361

367 Remove Upper Electronics House to East Detector Stairway 0.1 days 9/2/04 9/2/04 365

368 Replace Lower West Electronics House Walkway 0.1 days 9/2/04 9/2/04 367

369 Assemble Shield Wall 2 days 9/2/04 9/4/04 368

BBR,HC,CRYO,FW

BBR,HC,CRYO,FE

BBR,HC,CRYO,FE,FW

BBR,HC,CRYO,FW

BBR,HC,CRYO,FE

BBR,HC,CRYO,Crane,FW

BBR,HC,CRYO,Crane,FE

BBR,HC,CRYO,FE,FW

9/1

BBR,HC,Crane,FC

BBR,HC,Crane

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 24

2004 Installation Schedule

ID Task Name Duration Start Finish Predecessors

370 CLOSE DETECTOR (One 10-hour Shift) 2.3 days 9/4/04 9/8/04371 Deliver BWD End Plug, Lead Horseshoe and DIRC Cylinder to IR-2 0.2 days 9/4/04 9/4/04 369,363,339

372 Install BWD End Plug, Lead Horseshoe and DIRC Cylinder 0.25 days 9/4/04 9/4/04 371

373 Remove EQ Brace - Upr FWD East 0.15 days 9/4/04 9/7/04 372

374 Remove EQ Brace - Upr Fwd West 0.15 days 9/7/04 9/7/04 373

375 Remove EQ Brace - Lwr Fwd East 0.1 days 9/7/04 9/7/04 374

376 Close FWD East End Door 0.15 days 9/7/04 9/7/04 375,345

377 Remove Manlift 1 - Fwd West 0.05 days 9/7/04 9/7/04 376

378 Remove EQ Brace - Lwr FWD West 0.1 days 9/7/04 9/7/04 377

379 Close FWD West End Door 0.15 days 9/7/04 9/7/04 378

380 Remove EQ Brace - Upr BWD West 0.15 days 9/7/04 9/7/04 379,348

381 Remove Manlift 2 - BWD West 0.05 days 9/7/04 9/7/04 380

382 Remove EQ Brace - Lwr BWD West 0.1 days 9/7/04 9/8/04 381

383 Remove EQ Brace - Upr BWD East 0.15 days 9/8/04 9/8/04 382

384 Remove Manlift 3 - BWD East 0.05 days 9/8/04 9/8/04 383

385 Remove EQ Brace - Lwr BWD East 0.1 days 9/8/04 9/8/04 384

386 Close BWD West End Door 0.15 days 9/8/04 9/8/04 385

387 Close BWD East End Door 0.15 days 9/8/04 9/8/04 386

388 Close Curtain Wall 0.1 days 9/8/04 9/8/04 387

389 Detector Closed 0 days 9/8/04 9/8/04 388

BBR,HC,Crane,BC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FE

BBR,HC,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FW

BBR,HC,FW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BE

BBR,HC,Crane,BE

BBR,HC,Crane,BE

BBR,HC,BW

BBR,HC,BE

BBR,HC,Crane

9/8

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 25

2004 Critical Path

ID Task Name Duration Start Finish Predecessors

1 SUMMER DOWN 2004 57.75 days 7/1/04 9/8/042 Begin Summer Down 0 days 7/1/04 7/1/04

3 OPEN DETECTOR (Two 8-hour Shifts) 2 days 7/1/04 7/2/044 Open IR-2 Curtain Wall 0.1 days 7/1/04 7/1/04 2

5 Open FWD End Door - East 0.1 days 7/1/04 7/1/04 4

6 Install EQ Brace - FWD Lwr East 0.15 days 7/1/04 7/1/04 5

7 Insert Manlift 1 - FWD East 0.05 days 7/1/04 7/1/04 6

8 Install EQ Brace - FWD Upr East 0.1 days 7/1/04 7/1/04 7

9 Open Fwd End Door - West 0.1 days 7/1/04 7/1/04 8

10 Install EQ Brace - FWD Lwr West 0.15 days 7/1/04 7/1/04 9

11 Install EQ Brace - FWD Upr West 0.1 days 7/1/04 7/1/04 10

12 Remove DIRC Cyl, Lead and BWD End plug 0.25 days 7/1/04 7/2/04 11

13 Transport DIRC Cyl, Lead and BWD End Plug to IR-12 0.1 days 7/2/04 7/2/04 12

14 Open BWD End Door - West 0.1 days 7/2/04 7/2/04 13

15 Install EQ Brace - BWD Lwr West 0.15 days 7/2/04 7/2/04 14

16 Insert Manlift 2 - BWD West 0.05 days 7/2/04 7/2/04 15

17 Install EQ Brace - BWD Upr West 0.1 days 7/2/04 7/2/04 16

18 Open BWD End Door - East 0.1 days 7/2/04 7/2/04 17

19 Install EQ Brace - BWD Lwr East 0.15 days 7/2/04 7/2/04 18

20 Insert Manlift 3 - BWD East 0.05 days 7/2/04 7/2/04 19

21 Install EQ Brace - BWD Upr East 0.1 days 7/2/04 7/2/04 20

22 Detector Open and EQ Braced 0 days 7/2/04 7/2/04 21

7/1

BBR,HC,Crane

BBR,HC,FE

BBR,HC,Crane,FE

BBR,HC,Crane,FE

BBR,HC,Crane,FE

BBR,HC,FW

BBR,HC,Crane,FW

BBR,HC,Crane,FW

BBR,HC,Crane,BC

BBR,HC,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,BE

BBR,HC,Crane,BE

BBR,HC,Crane,BE

BBR,HC,Crane,BE

7/2

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 26

2004 Critical PathID Task Name Duration Start Finish Predecessors

23 PREP TO REMOVE STEEL (Two 8-Hour Shifts) 6.4 days 7/1/04 7/9/0431 RELEASE SOLENOID SUPPORTS (Day Shift) 1.2 days 7/3/04 7/6/0432 Unbolt Solenoid External Axial Support Rods - Upr FWD East & Upr FWD West 0.25 days 7/3/04 7/3/04 22

33 Remove Solenoid Radial Support Arm - FWD Upr East 0.1 days 7/3/04 7/3/04 32

34 Remove Solenoid Radial Support Arm - FWD Upr West 0.1 days 7/3/04 7/3/04 33

35 Release Solenoid External Radial Wedge Support - FWD Upr East 0.05 days 7/3/04 7/3/04 34

36 Release Solenoid External Radial Wedge Support - FWD Upr West 0.05 days 7/3/04 7/3/04 35

37 Release Solenoid External Radial Wedge Support - BWD Upr East 0.05 days 7/3/04 7/3/04 36

38 Release Solenoid External Radial Wedge Support - BWD Upr West 0.05 days 7/3/04 7/3/04 37

39 Unbolt Solenoid External Axial Support Rods - Lwr East & Lwr West 0.25 days 7/3/04 7/3/04 38

40 Remove Solenoid Radial Support Arm - FWD Lwr East 0.1 days 7/3/04 7/3/04 39

41 Remove Solenoid Radial Support Arm - FWD Lwr West 0.1 days 7/6/04 7/6/04 40

42 Transport Solenoid Radial Support Arms to IR-12 0.1 days 7/6/04 7/6/04 41

43 Solenoid Supports Released 0 days 7/6/04 7/6/04 42

44 REMOVE SHIELDING (Day Shift) 3 days 7/6/04 7/9/0445 Disassemble Shield Wall Blocks 2 days 7/6/04 7/8/04 43

46 Remove FWD IFR Background Shield Wall 1 day 7/8/04 7/9/04 45

47 MISCELLANEOUS PREP WORK (Swing Shift) 4.4 days 7/3/04 7/9/0455 Remove Lower West Electronics House Walkway - Take to Shop 0.1 days 7/9/04 7/9/04 46,54

56 Install Upper Electronics House to East Detector Stairway 0.1 days 7/9/04 7/9/04 55

57 REMOVE STEEL (Two 8-hour Shifts) 2.45 days 7/9/04 7/12/0458 Remove Upr FWD Center Gap Plate - Transport to IR-12 0.15 days 7/9/04 7/9/04 56

59 Remove Corner Plate F1 - Transport to IR-12 0.4 days 7/9/04 7/9/04 58

61 Remove Corner Plate F6 - Transport to IR-12 0.4 days 7/9/04 7/10/04 59

63 Remove Flux Bar - FWD Top - Transport to IR-12 0.2 days 7/10/04 7/10/04 61

64 Remove Lwr FWD Center Gap Plate - Transport to IR-12 0.2 days 7/10/04 7/10/04 63

65 Remove Corner Plate F3 - Transport to IR-12 0.4 days 7/10/04 7/12/04 64

67 Remove Corner Plate F4 - Transport to IR-12 0.4 days 7/12/04 7/12/04 65

68 Record Steel Movement 0.05 days 7/12/04 7/12/04 67

69 Remove Flux Bar - FWD Bottom - Transport to IR-12 0.25 days 7/12/04 7/12/04 68

BBR,HC,CRYO,FE,FW

BBR,HC,CRYO,Crane,FE

BBR,HC,CRYO,Crane,FW

BBR,HC,CRYO,FE

BBR,HC,CRYO,FW

BBR,HC,CRYO,FE,FW

BBR,HC,CRYO,Crane,FE

BBR,HC,CRYO,Crane,FW

7/6

BBR,HC,RIG,Crane

BBR,HC,Crane,FC

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC

BBR,HC,Crane,FC

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 27

2004 Critical PathID Task Name Duration Start Finish Predecessors

70 BOTTOM SEXTANT DETECTOR REPLACEMENT 19.45 days 7/12/04 8/4/0472 Transport Lower Vertical Positioner Components to IR-2 0.1 days 7/12/04 7/12/04 69

73 Install Lower General Fixture Vertical Positioner 0.25 days 7/12/04 7/13/04 72

74 Transport RPC Removal Hardware to IR-2 0.1 days 7/13/04 7/13/04 73

75 Remove 18 Layers of RPCs & Dispose (2hr 53min/layer)(Pull & Cut) 4 days 7/13/04 7/17/04 74

76 Deliver LST Modules to IR-2 0.15 days 7/17/04 7/17/04 75

77 Install 12 Layers of LSTs (7hr 30min/layer) (One 10-hour Shift) 9 days 7/17/04 7/28/04 76

78 Transport Bottom Brass Absorber Plates to IR-2 (84 Plates) 0.1 days 7/28/04 7/28/04 77

79 Install 6 Layers of Brass Absorber - Bottom (51min/plate) 5.5 days 7/28/04 8/4/04 78

80 Bottom Sextant LSTs & Brass Absorber Installed 0 days 8/4/04 8/4/04 79

81 Remove Lower General Fixture Vertical Positioner - Transport to IR-12 0.25 days 8/4/04 8/4/04 80

82 SCHEDULE STATUS - DO WE PROCEED? 0 days 8/4/04 8/4/04 8183 TOP SEXTANT DETECTOR REPLACEMENT 15.7 days 8/4/04 8/21/0485 Transport Upper Vertical Positioner Components to IR-2 0.1 days 8/4/04 8/4/04 82

86 Install Upper General Fixture Vertical Positioner 0.25 days 8/4/04 8/4/04 85

87 Remove 18 Layers of RPCs & Dispose - Top (1hr 48min/lyr) 2.5 days 8/4/04 8/7/04 86

88 Transport RPC removal Hardware to IR-12 0.1 days 8/7/04 8/7/04 87

89 Deliver LST Modules to IR-2 0.15 days 8/7/04 8/7/04 88

90 Install 12 Layers of LSTs (6hr 40 min/lyr) (One 10-hour Shift) 8 days 8/7/04 8/17/04 89

94 LST CABLING, HV & GAS (Owl Shift) 25.45 days 7/28/04 8/26/04102 Install Wireways and ConnectSignal Cabling - Top FWD 2 days 8/17/04 8/19/04 90

103 Install/Connect HV Cabling - Top FWD 1 day 8/19/04 8/20/04 102

104 Install/Connect Gas Lines - Top FWD 1 day 8/20/04 8/21/04 103

105 Install Wireways and Connect Signal Cabling - Top BWD 2 days 8/21/04 8/24/04 104

106 Install/Connect HV Cabling - Top BWD 1 day 8/24/04 8/25/04 105

107 Install/Connect Gas Lines - Top BWD 1 day 8/25/04 8/26/04 106

108 Top LSTs Connected With Cabling, HV & Gas 0 days 8/26/04 8/26/04 107

110 LST System Commissioning - Top 0 days 8/26/04 8/26/04 108

111 Remove Upper General Fixture Vertical Positioner - Transport to IR-12 0.5 days 8/26/04 8/26/04 110,109

BBR,HC,Crane,FC

BBR,HC,Crane,FC,BE,BW

BBR,HC,LST,Crane,FC,BE,BW

BBR,HC,Crane,FC,BE,BW

8/4

BBR,HC,Crane,FC

8/4

BBR,HC,Crane,FC

BBR,HC,Crane,FC,BE,BW

BBR,HC,LST,Crane,FC,BE,BW

BBR,LST,FC

BBR,LST,FC

BBR,LST,FC

BBR,LST,BE,BW

BBR,LST,BE,BW

BBR,LST,BE,BW

8/26

8/26

BBR,HC,Crane,FC

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 28

2004 Critical PathID Task Name Duration Start Finish Predecessors

112 INSTALL STEEL (Two 8-hour Shifts) 4.2 days 8/26/04 9/1/04113 INSTALL LOWER STEEL 1.75 days 8/26/04 8/28/04114 Deliver FWD Bottom Flux Bar to IR-2 - Install 0.25 days 8/26/04 8/27/04 111

115 Deliver Corner Plate F3 to IR-2 - Install 0.5 days 8/27/04 8/27/04 114

117 Deliver Corner Plate F4 to IR-2 - Install 0.5 days 8/27/04 8/28/04 115

119 Deliver LWR Center Gap Plate to IR-2 - Install 0.15 days 8/28/04 8/28/04 117

120 Deliver Lwr FWD Gap Plates to IR-2 0.05 days 8/28/04 8/28/04 119

121 Install Lwr FWD Gap Filler Plates 0.25 days 8/28/04 8/28/04 120

122 INSTALL UPPER STEEL 1.7 days 8/28/04 8/31/04123 Deliver FWD Top Flux Bar to IR-2 - Install 0.2 days 8/28/04 8/28/04 121,111

124 Deliver Corner Plate F1 to IR-2 - Install 0.5 days 8/28/04 8/30/04 123

126 Deliver Corner Plate F6 to IR-2 - Install 0.5 days 8/30/04 8/30/04 124

128 Deliver UPR FWD Center Gap Plate to IR-2 - Install 0.15 days 8/30/04 8/30/04 126

129 Deliver Upr FWD Gap Plates to IR-2 0.05 days 8/30/04 8/30/04 128

130 Install Upr FWD Gap Filler Plates 0.25 days 8/31/04 8/31/04 129

131 Flux Return Steel Assembled 0 days 8/31/04 8/31/04 130

142 PREP FOR DETECTOR CLOSE-UP (One 10-hour Shift) 4.15 days 8/31/04 9/4/04143 ADJUST SOLENOID SUPPORTS 1.2 days 8/31/04 9/1/04144 Deliver Solenoid Radial Support Arms to IR-2 0.1 days 8/31/04 8/31/04 131

145 Install Solenoid Radial Support Arm - FWD Lwr West 0.1 days 8/31/04 8/31/04 144,130

146 Install Solenoid Radial Support Arm - Fwd Lwr East 0.1 days 8/31/04 8/31/04 145

147 Connect and Tension Solenoid External Axial Support Rods - Lwr FWD West & Lwr Fwd East 0.25 days 8/31/04 8/31/04 146

148 Adjust Solenoid External Radial Support Wedge - Upr Fwd West 0.05 days 8/31/04 8/31/04 147

149 Adjust Solenoid External Radial Support Wedge - Upr FWD East 0.05 days 8/31/04 8/31/04 148

150 Adjust Solenoid External Radial Support Wedge - Upr Bwd East 0.05 days 8/31/04 8/31/04 149

151 Adjust Solenoid External Radial Support Wedge - Upr Bwd West 0.05 days 8/31/04 8/31/04 150

152 Install Solenoid Radial Support Arm - Upr FWD West 0.1 days 9/1/04 9/1/04 151

153 Install Solenoid Radial Support Arm - Upr FWD East 0.1 days 9/1/04 9/1/04 152

156 INSTALL SHIELDING 3.2 days 9/1/04 9/4/04157 Install FWD IFR Background Shield Wall 1 day 9/1/04 9/2/04 153

159 Remove Upper Electronics House to East Detector Stairway 0.1 days 9/2/04 9/2/04 157

160 Replace Lower West Electronics House Walkway 0.1 days 9/2/04 9/2/04 159

161 Assemble Shield Wall 2 days 9/2/04 9/4/04 160

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FE,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FC

BBR,HC,Crane,FE,FW

8/31

BBR,HC,CRYO,FW

BBR,HC,CRYO,FE

BBR,HC,CRYO,FE,FW

BBR,HC,CRYO,FW

BBR,HC,CRYO,FE

BBR,HC,CRYO,Crane,FW

BBR,HC,CRYO,Crane,FE

BBR,HC,Crane,FC

BBR,HC,Crane

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 29

2004 Critical Path

ID Task Name Duration Start Finish Predecessors

162 CLOSE DETECTOR (One 10-hour Shift) 2.3 days 9/4/04 9/8/04163 Deliver BWD End Plug, Lead Horseshoe and DIRC Cylinder to IR-2 0.2 days 9/4/04 9/4/04 161,155,131

164 Install BWD End Plug, Lead Horseshoe and DIRC Cylinder 0.25 days 9/4/04 9/4/04 163

165 Remove EQ Brace - Upr FWD East 0.15 days 9/4/04 9/4/04 164

166 Remove EQ Brace - Upr Fwd West 0.15 days 9/7/04 9/7/04 165

167 Remove EQ Brace - Lwr Fwd East 0.1 days 9/7/04 9/7/04 166

168 Close FWD East End Door 0.15 days 9/7/04 9/7/04 167,137

169 Remove Manlift 1 - Fwd West 0.05 days 9/7/04 9/7/04 168

170 Remove EQ Brace - Lwr FWD West 0.1 days 9/7/04 9/7/04 169

171 Close FWD West End Door 0.15 days 9/7/04 9/7/04 170

172 Remove EQ Brace - Upr BWD West 0.15 days 9/7/04 9/7/04 171,140

173 Remove Manlift 2 - BWD West 0.05 days 9/7/04 9/7/04 172

174 Remove EQ Brace - Lwr BWD West 0.1 days 9/7/04 9/7/04 173

175 Remove EQ Brace - Upr BWD East 0.15 days 9/8/04 9/8/04 174

176 Remove Manlift 3 - BWD East 0.05 days 9/8/04 9/8/04 175

177 Remove EQ Brace - Lwr BWD East 0.1 days 9/8/04 9/8/04 176

178 Close BWD West End Door 0.15 days 9/8/04 9/8/04 177

179 Close BWD East End Door 0.15 days 9/8/04 9/8/04 178

180 Close Curtain Wall 0.1 days 9/8/04 9/8/04 179

181 Detector Closed 0 days 9/8/04 9/8/04 180

BBR,HC,Crane,BC

BBR,HC,Crane,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FE

BBR,HC,FE

BBR,HC,Crane,FW

BBR,HC,Crane,FW

BBR,HC,FW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BW

BBR,HC,Crane,BE

BBR,HC,Crane,BE

BBR,HC,Crane,BE

BBR,HC,BW

BBR,HC,BE

BBR,HC,Crane

9/8

H2 H1 H2 H1 H2 H12003 2004 2005 2006

October 22, 2003 H.J. Krebs 30

Conclusions and Comments• 10 weeks of scheduled work time is needed to replace RPCs with 6

layers of brass absorber and 12 layers of LST detectors in both the top and bottom sextants if NOTHING goes wrong– Additional 4 days of PPS certification almost a certainty– Some time lost for tours and/or photography is a probability– No time allotted to replace LSTs that are not functioning properly after

installation – overly optimistic– 17 days allotted for commissioning of lower sextant LSTs but only 2

days are allotted for commissioning of upper sextant LSTs– Many tasks have NEVER been performed previously – could be a long

learning curve– Will lose 1:1 on schedule time for any of the above

• There may be some schedule optimization possible – but not much. From the critical path it is determined that the schedule is:– Driven by crane usage – 1 crane– Driven by LST installation – 1 installation team– Most everyone is working in the same place – FWD end of barrel

October 22, 2003 H.J. Krebs 31

Conclusions and Comments• Our mechanical installation team is aging

– Have some young replacements but not as experienced• A mechanical breakdown of the crane would have an

adverse schedule effect• An agreement must be worked out to deal with the

VESDA system during this installation period– Have experienced significant schedule delays in the past by us

setting off the fire alarms• A two month down would result in a reduced scope of

work– Only one sextant could have the brass absorber/LST

replacement, or– Remove RPCs and replace with brass in both sextants but NO

LST installation (just an opinion), or– Some other option

• Our goal is to be ready as early as possible to take advantage of any potential schedule advancement.