LARP Accelerator Systems Status, Plans, Questions 14 January 2009 CERN-US Meeting, CERN Tom...
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Transcript of LARP Accelerator Systems Status, Plans, Questions 14 January 2009 CERN-US Meeting, CERN Tom...
LARP Accelerator Systems Status, Plans, Questions
14 January 2009
CERN-US Meeting, CERN
Tom Markiewicz/SLAC
BNL - FNAL- LBNL - SLAC
US LHC Accelerator Research Program
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 2 / 34
Personal Preamble
Previous LARP leadership had the attitude“We are not a CERN job shop”
Currently, discussion shades to“Why bother if CERN’s not interested”
DOE management CONSTANTLY tells us“Fixed sum game, MANAGE, make the tough decisions, LARP can’t do
everything…”LARP programs with LARP hard deliverables have not been “on-time; on-budget”
– Luminosity Monitor, Rotatable Collimator, Roman pot for UA9– Fear of creating a similar but larger fiscal problem if begin a Crab Cavity– Need for better written handshake/documentation obvious– Impact of LHC schedule a touchy but important subject
Confusion in the minds of upper level managers between Phase I, II Lumi and Phase II collimation upgrades and LARP/APUL has created some ill willAnything this group can do to help clarify this is helpful
LARP has tried to maximize the Accelerator Systems and to draw on non-LARP (i.e. laboratory) resources with some success– Fiscal situation not maintainable & will need to downsize LARP AS program
to fund effort currently being “donated” by labs “as an investment”
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 3 / 34
Outline
• Introduce LARP Accelerator System task list and what LARP is doing to manage them and maintain communication. Invite your candid comments and clarifications– Prioritization– Grade what’s been done– Agreement on Deliverables & Milestones– Adequateness of LARP internal documentation for tasks
• Status, reports, documentation,…
– Bi-Lateral CERN/Task documentation• Technical specification of agreed deliverables, “Hand-off” criteria,
specification of level of CERN/LARP support before & after handoff
• Report on Luminosity Monitor recent history and status• Report on Rotatable Collimator• Comments on LLRF, Ecloud, Crab if time allows
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 4 / 34
Task List & FY09
Budget2.9M$
BNL FNAL LBNL SLAC Total
1 Accelerator Systems 380 311 1,005 1,205 2,901 1.1 Instrumentation Ratti 50 35 800 40 9251.1.1 Phase I 50 35 800 40 9251.1.1.1 Chromaticity Feedback Tan (15) 15 01.1.1.2 Luminosity Monitor Ratti 800 8001.1.1.4 Schottky Jansson 20 201.1.1.5 AC Dipole Bai 65 0 651.1.1.6 LLRF Fox 40 40
1.3 Collimation Markiewicz 35 101 0 985 11211.3.1 Phase I 0 0 0 0 01.3.1.1 Cleaning Efficiency Study Drees 0 01.3.2 Phase II 35 101 0 985 11211.3.2.1 Rotatable Collimators Markiewicz 950 9501.3.2.2 Tertiary Collimation Study Mokhov 01.3.2.2 Crystal Collimation Peggs 35 101 0 35 171
T980 at Tevatron Mokhov 10 76 10 96CRYSTAL at SPS Peggs 25 25 25 75
1.3.2.3 Irradiation Studies Simos 0
1.4 Accelerator Physics Fischer 295 175 205 180 855 1.4.1 Studies 295 175 205 180 855 1.4.1.1 Electron cloud Pivi - - 90 65 155
Simulations Furman - - 50 - 50 Ecloud FB at SPS Fox 40 40 80 Grooved Chambers Pivi 25 25
Beam-beam Valishev 70 130 - - 200 1.4.1.2 Simulation Sen - 110 - 110 1.4.1.3 Wire Beam-Beam compensation Fischer 50 - - - 50 1.4.1.5 Electrons lens Shiltsev 20 20 - - 40 1.4.1.4 Discretionary Markiewicz 25.0 25.0 25.0 25.0 100 1.4.1.6 Crab cavities Calaga 200 20 40 40 300 1.4.1.6 PS2 Studies Wienands 50 50 100
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 5 / 34
Accelerator System Tasks that have “Finished”
By end of FY07, collaboration on– Tune & Coupling feedback– Schottky Monitor– AC Dipole
resulted in installed hardware. Uniformly deemed a SUCCESS.– “Hardware” was built to LARP designs by CERN:
• no cost or schedule drama
– In FY08 LARP provided modest support for testing, improvements, software interfaces and commissioning and in FY09 the line items remain with a funds to allow ‘Beam Commissioning’
By end of FY07– RHIC Benchmarking of SIXTRACK– MARS-based study of tertiary collimators– Irradiation study of Carbon & Glidcop collimator materials
resulted in presentations & publications. Not useless, but value discussable.– Each of these STUDIES is nominally finished– The irradiation study would continue if funds were available to support it
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 6 / 34
Program Oversight
My experience as AS Program Leader in FY2008 has led to a number of actions
Form Accelerator Systems Advisory Committee to parallel Magnet Steering Comm.– Bruning, Fischer, Markiewicz, Peggs/Prebys, Ratti
ASAC meets (Webex) at least weekly on general matters or as crisis management team– New Initiative selection– Budget– Collaboration Meeting Planning– Luminosity Monitor Program Management
Structure LARP Tasks into units large enough to warrant regular WEBEX meetings and see to it that these are held with additional participation of Program Leader, Deputy, LARP Accel System managers AND CERN Points of Contact– As opposed to semi-annual reports of what Physicist X did at Lab Y for Task
Z using his/her favorite simulation code– At CMs, apathy of general LARP membership to anything they are not
personally involved in is striking & sad
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 7 / 34
Project Management
LARP Acc. Systems is producing hardware for CERN in 3 areas– Lumi Monitor– Rotatable Collimator– Roman Pot for SPS Crystal Collimation Expt #UA9
And is considering delivering a crab cavity prototype
My thoughts:– Each of these would ideally be managed outside of LARP– Annual reviews necessary but not sufficient
• Aug. 2007 Lumi review & April ’08 CM10 did not foresee June’08 ‘crisis’
– Monthly budget reporting without “earned value” necessary but not sufficient
– Lumi has convinced me that some external manager(s) must follow progress ~biweekly to fully understand the project in real time so that surprises do not happen
– TWM is trying to do this for the UA9 Roman Pots (reporting to Eric)– No one forces TWM to do this for Rotatable Collimator
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 8 / 34
CERN and LARP Communication
Occurs at various CERN levels– CERN Point(s) of Contact:
• eg. Assmann (collimation); Bravin (Lumi)– CERN middle managers: Ostijic (IR Upgrade Czar)– CERN key managers: Evans/Myers– CERN LARP contact: Oliver Bruning– CERN Director
Roughly mapping onto LARP– LARP Task Leader
• Markiewicz (Collimation); Ratti (Lumi)– LARP LAUC/APUL czar (Peggs/Wanderer)– LARP L1 (Markiewicz)– LARP Program Leader (Prebys)– OHEP (Strauss, Kovar)– US Lab leadership (Kahn-SLAC, Holmes-FNAL, Gourlay-LBL, Roser-BNL)
• Oral “story” sometimes inconsistent and full set of players never in same room• Inadequate written correspondence• Improvement in both these areas required
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 9 / 34
LARP Instrumentation Task Meetings
Chromaticity Feedback, Schottky Monitor, AC Dipole– No formal periodic meetings; assume sporadic contact with CERN
POCs; reports at parallel sessions of LARP collab mtg (CM)– No direct management oversight
Luminosity Monitor– Regular LBL staff mtgs and Ratti/Bravin mtgs during CERN trips– Biweekly status meetings with
• Prebys, Markiewicz, Bruning, Peggs, Ratti, Bravin, Corlett (LBL mgmt), 2 LBL EEs
– Full grilling by AS at CM#11 followed by plenary report to LARP
LLRF Modelling– SLAC 5 person group plus 2 CERN POCs exchange email & visits– SLAC ARD presentations ~6 weeks and CM presentation– No direct management oversight
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 10 / 34
LARP Collimation Task Meetings
Rotatable Collimator
– Weekly staff (5) mtg at SLAC with web-posted progress report
– Biweekly webex/video with CERN collimation group (5-10 people)
– Report at parallel session of CM mtg (3 people attend) & included in plenary summary (to largely apathetic audience)
Crystal Collimation
– Weekly Webex meeting to which all members of both T980 (Fermilab expt.) and CERN SPS UA9 are invited
• Typically SLAC(6), BNL(1) plus Markiewicz, Prebys, Peggs & Scandale (CERN)• Approx. monthly reports from FNAL (Mokhov) on T980
– Unknown but large number of bi-lateral UA9 meetings in Europe
– Regular meetings of FNAL T-980 staff & FNAL resident visitors
– Semi annual mini crystal workshops & LARP CM presentations
– I am personally disappointed that the synergy hopped for between these two complementary efforts is not being realized
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 11 / 34
LARP Accelerator Physics Task Meetings
Beam-Beam Simulations in support of Electron Lens & Wire Compensation– No regular meetings to my knowledge– Annual mini-wkshp (eg. 12/3/08 at BNL) & report at parallel session of CM
Ecloud: Simulations, SPS Measurements & studies, SPS Vacuum chamber insert studiy– Monthly Webex attended by CERN (3), SLAC (3) and LBL(3) and typically
Prebys & Markiewicz– Semi-annual meetings in context of global Ecloud effort (eg. EC Mitigation-
08 CERN, 12/08) and CARE series of workshops– Reports in parallel session of CM
Crab Cavity– Monthly international webex
• UK, KEK, CERN (incl. LARP-residents), BNL, SLAC, FNAL, LBL, AES• Prebys, Markiewicz, Peggs, Strait
– Annual mini-workshop, quarterly(?) mtgs at CERN, LARP CMs & CARE PS2
– Weekly/biweekly webex with BNL, FNAL, LBL & SLAC w/ Prebys & Markiewicz
– CM and CERN organized workshops
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 12 / 34
Many New Initiatives were Discussed at LARP CM#10-April 2008 BNL
The initiatives discussed were:
– LLRF Studies at LHC
– Control of Ecloud Instability in the SPS with Transverse RF Damping
– SPS Ecloud Remediation via Grooved and Coated Vacuum Chambers
– The CRYSTAL collimation test at SPS
– An Optical Diffraction Monitor for LHC
– Coherent Electron Cooling for LHC
– Collimation Studies at LBNL’s HCX facility
– Studies of Intensity Dependent Performance Limits to the LHC Injector Chain
– PS2 Studies
– Instrumentation Commissioning Proposal
– The use of PEP-II “Model Independent Analysis” at LHC
– The use of PEP-II “Phase Advance Analysis” at LHC
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 13 / 34
LARP ASAC MeetingsBruning, Fischer, Markiewicz, Peggs, Ratti
Initiatives were graded on the following topics with the first three being considered the most important factors. The CERN point of contact canvassed the relevant parties at CERN to gauge CERN interest and committee consensus was reached on the other topics based on CM#10 presentations and supporting documentation.– Impact on LHC luminosity enhancement– Level of interest by CERN– State of art use of physics or technology– Level of institutional collaboration – Time scale– Average yearly cost– University Involvement– Relevance to the US Program– Whether or not the program would be done in any event without LARP
funds– Level of CERN resources contributed to the program– Level of non-LARP US resources contributed to the program– Definite end of program with clear definition of deliverable or result
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 14 / 34
NI Decisions for Spring 2008
While the level of support LARP can provide is in most cases less than that requested by the proponents, the LARP ASAC has agreed to:– Create a LLRF Studies task under Instrumentation– Expand the scope of the existing “Electron Cloud” task to include
• Ecloud Simulations
• SPS Ecloud Feedback
• SPS Ecloud vacuum chamber study
– Support the CRYSTAL collimation experiment at the SPS as part of the existing Crystal Collimation task
– Create a new “PS2 Studies” task under Accelerator Physics whose scope still needs more definition but which will include the proposed intensity limitation to the LHC injector chain performance
Approved by LARP exec committee Sept. 2008
Prebys letter to all LARP members with announcement
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 15 / 34
Luminosity Monitors2 per IP + One Spare
Detector Interface ChassisGAS Distribution/Monitoring Panel
PC for Local Monitoring1 per IP
DAQ Firmware
Shaper (& Chassis)Preamp/HV Assembly
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 16 / 34
Luminosity Monitor Crisis & Response
As Lumi is/will be the first LARP produced hardware installed in LHC it is essential that we deliver
June 2008 letter from CERN luminosity monitoring group leader Enrico Bravin raised concern that– Lumi might be be late for 2008 run– PMT system would be deployed for 2008– As long as robust system ready for 2009, no harm
Response:1. Major LARP support in FY09, before CY2009 run, to fully complete the
system (electronics fabrication, firmware, software & integration)2. Biweekly meetings of LARP ASAC w/Ratti-Bravin since June 29, 2008
– 13 meetings held with written reports (TWM)3. Greatly increased involvement of LBL management (Corlett + EE Head)
– MS Project maintained by LBL EE & kept up to date4. Ongoing discussions on how to minimize commissioning cost & handoff
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 17 / 34
Lumi Status: All Hardware on Track for pre-April 2009 Installation & Integration
Detectors– 4 detectors in their final configuration at CERN and spare at LBL– Installation will happen upon CERN’s request
• CERN activities at point 1 and 5 currently preclude chamber installation
Preamps– Two or four needed finished– Protoype unit will be upgraded to “production” version– about 2 weeks behind schedule, but within the float allowed
Shapers– Boards ready & chassis panels back from the shops; Need integration– Plan to ship in January
Detector Interface Units (2)– Both ready to be shipped (ahead of schedule)
Gas Panels– Finished & turned over to CERN
• One FM needs to be replaced & gas monitoring software tweaked
Firmware– Phase I (Low Luminosity “Counting”) complete– Phase II (High Lum pulse height with centroid deconvolution) a future project
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 18 / 34
Points for Discussion: Luminosity Monitor
Satisfaction with currently planned production and schedule
Level and duration of continued involvement of LBL team as luminosity increases
Adequacy of current and planned future documentation
Agreement on performance benchmarks for system
??
LARP Rotatable Collimators for LHC Phase II Collimation
Gene Anzalone (CAD), Eric Doyle (ME-FEA, ret.), Lew Keller (FLUKA, ret.), Steve Lundgren (ME), Tom Markiewicz (Phys), Reggie Rogers (Mech Tech)
& Jeff Smith (PD)
BNL - FNAL- LBNL - SLAC
US LHC Accelerator Research Program
1) Adapt rotatable NLC collimator design concept to LHC: “RC”
2) Build and test one collimator jaw with 10kW resistive heaters to verify thermo-mechanical performance
• Minimize deflection when absorbs with 60kW for 10 sec
3) Build a collimator that can be destructively beam tested at new TT60 facility yet which still rotates, provides clean collimation surfaces, whose cooling system survives and which is UHV
4) Build a 2nd(?) fully functional collimator & test it at LHC
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 20 / 34
Rotatable Collimator Design
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 21 / 34
Rotatable Collimator Manufacturing
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 22 / 34
RF Transition Piece and “Geneva” Rotating Drive
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 23 / 34
RC0 10kW Distortion Test
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 24 / 34
Rotating Collimator Drawing Treenot counting prototype pieces, fixtures,
redesigns, etc
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 25 / 34
RC Status
SLAC team continues to feel optimistic that a fully functional prototype can be finished in FY09. – Materials, fabrication requisitions for 3 new jaws have been placed and
some parts are in houseMechanically precise UHV parts are difficult
– Accepted 2/6 molydenum shafts with damage– In RC0, had two major machining & brazing snafus
Undermanned relative to CERN Phase II (25 FTEs over 2 years) and underfunded (8 MCHF M&S)
“Finishing” and integrating prototype with as many parts and subassemblies as RC in time will be challenging
Very good will between Assmann & TWM but need firmer handshake– TT60 prototype AND LHC prototype– Formal requirements documents
• Cu tubing versus CuNi tubing– Level of CERN support – Handoff definition– Commissioning plan
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 26 / 34
Points for Discussion: Rotatable Collimator Program
• Assmann/Markiewicz agree to a timeline for a technology decision on Phase II Secondary collimators that requires– Adequate LHC running with Phase I collimation system to understand
limitations and possible schemes to ameliorate efficiency/impedance issues
– Completion of TT60 test facility (with SLAC participation) and robustness testing of LARP RC prototype & two CERN prototypes
– Improvement of 3 designs, if indicated by TT60 tests, & installation and tests in LHC
– Final technology, lattice dependent choice of a set of secondary Phase II collimators
• Impact of any decision on “Cold Collimators” on this plan not clear• Current discussions to inclusion of any production of the 30 Phase II
secondary collimators as part of APUL and the so-called Phase I IR Upgrade not clear and generates negative comments (“I hear CERN is not interested, so why are we bothering with this”)
• Written documentation on what must be delivered, performance specifications, CERN support for delivrables, eventual continuing involvement for commisiopning, etc are sorely needed: How do we ensure task manager(s) supply this
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 27 / 34
LHC LLRF TaskJohn Fox , Claudio Rivetta, Themis Mastorides, Dan van Winkle
Why SLAC?PEP-II and LHC have same basic LLRF architectureSLAC Group has much unique expertise and well developed set of software tools developed
for PEP-II that can be used to configure the LHC system, study it and improve it
Progress in 2008Five multi-weeks trips in April, June 2008, NovemberSLAC software model configured for LHC and interfaced to control system
In post-Sept.19,2008 world, remote diagnostics more highly valued than ever
Near Term Plans8 person-weeks at CERN in CY09 for beam commissioning
Data from closed loop LLRF system with beam present will be compared against model and changes to LHC hardware configuration suggested
Expand model to include feedback & longitudinal emittance dilutionEventually, develop theory & programs to model the long-term (24 hr) behavior
CostsPredominately labor provided by SLAC Accelerator Development funds in FY08, FY09
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 28 / 34
Sample LLRF Result
Open Loop Xfer Function from time-domain excitation technique vs. model result (green)
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 29 / 34
Transverse RF Feedback in SPS to Control Beam Instabilities Produced by Electron Cloud Effects
Focus Ecloud simulation effort on effects expected in SPS that could be mitigated via techniques pioneered by US labs
SPS Ecloud dynamics studies predictHorizontal - coupled-bunch behaviorVertical - single bunch-like instability
2008 Plan (continuing in ’09)Measure & quantify Ecloud effects on beam (instrumentation)Compare measurements with E cloud/beam models
≥2009 PlanDevelop beam-FB simulation, evaluate possible feedback implementations.Propose a technical implementation & develop Engineering SpecsProof of principle experiments & technical R&D
Eventual possible LHC construction project item
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 30 / 34
Grooved Vacuum Insertion Test at the SPS for Electron Cloud Studies
Electron cloud mitigation test chambers for SPS in prep
SLAC is manufacturing two grooved insertionsMetal folding & razor blades techniques for 1mm max. height
Installation & Testing planned
Metal Folding: Form multiple folds. [EMEGA Company, USA] Brazed-up Assembly: Use individual razor type foil blades
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 31 / 34
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 32 / 34
T980 and UA9
152mm x-y Dual sided Roman Pot for UA9
manufactured by LARP/SLAC
Single-particle dynamics study brings knowledge applicable to LHC using Si tracking detectors in Roman Poys
Improved T980 Goniometer and October 2008 Channeling Results
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 33 / 34
Points for Discussion: Crab Cavity
Plan for proof of principle experiment at LHC– One cavity/cryostat system or two?– Location, available space, infrastructure, time scale for installation
& removal– Fabrication details, cost & schedule– Measurements to be made and definition of success– Management of multilab effort with LARP, CERN and industry
Relevance to final configuration– Local (2 per beam per IP) versus global– Time scale, cost, etc.– Studies (e.g. collimation)
CERN-US Mtg - 14 Jan 2009 LARP Acc.Systems - T. MarkiewiczSlide n° 34 / 34
FY09 Challenges in Accelerator Systems
Deliver Luminosity Monitor and end task
Deliver RC Prototype and scale back task
Launch Crab Cavity with correct level of effort ($), matching CERN interests & schedule
Craft and launch PS2 program
Work effectively with CERN on collimation component of APUL
Synergize T980 and UA9 crystal collimation teams and control costs of UA9 Roman Pot