A 12-min Introduction to The ILC Machine Detector...
Transcript of A 12-min Introduction to The ILC Machine Detector...
A 12-min Introduction toThe ILC Machine Detector
Interface and SiD
Tom Markiewicz/SLACLCWS’10, Beijing, China
27 March 2010
2010.03.28 SiD MDI-LCWS’10 T. Markiewicz/SLAC 2 of 21
QD0 Support System
Vibration-cognizant support of the final quadrupole (“QD0”) cryostat and its semi-permanently attached 1.9K heat exchanger & feed box, consistent with “Push/Pull” motion of the detector– QD0 “owned” by SiD & rests on door
• Not cantilevered off a rear support (ILD)• Not in unmoveable tunnel extension (CLIC)
– QD0 travels “cold” along w/ SiD during push/pull after beamline vacuum broken at designated valves
– Vibration mitigated by having facing QD0 lenses as logically connected to the supporting bedrock floor as possible & relying on coherence length of natural seismic ground motion to correlate motion of lenses while minimizing/eliminating all vibration sources that SiD or BDS equipment in IR hall might produce
• Prejudice AGAINST a platform as it might serve to amplify motion to detector• Benefit from Barrel-Door design that does not have a “Salami-sliced” barrel
– ANSYS studies of QD0 vibration begun in 2009 & to be updated at this conference tomorrow (Oriunno)
QD0 QDF
Shielding
Spacer structure
Rails on the support tube
Active stabilizers
2m Door opening Procedure, on the beam I
2010.03.28 SiD MDI-LCWS’10 3 of 21T. Markiewicz/SLAC
QDF
Shielding
Spacer structure
QD0
Active stabilizers
Rails on the support tube
2m Door opening Procedure, on the beam II
2010.03.28 SiD MDI-LCWS’10 4 of 21T. Markiewicz/SLAC
QDF
Shielding
Spacer structure
QD0
Active stabilizers
Rails on the support tube
2m Door opening Procedure, on the beam III
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Integration of the QD0 cryoline
Hilman Rollers
QD0 service cryostat
He2 cryoline
Ancillary platform
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QD0 Alignment System
• Conceptual 5 d.o.f. magnet mover system to satisfy the alignment requirements of the beam delivery system proposed but needs an engineering design
– As in FFTB (now at ATF2)– As used for LCLS wigglers
• “Mona Lisa” Frequency Scanning Interferometry system with associated free lines of sight to confirm alignment suggested but not currently included in SiD baseline
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Steppers
Steppers
Steppers
QD0 Cryostat
Cam-wedges
Steppers
2 d.o.f.
3 d.o.f. View A-A
View A-A
Shaft
QD0
Door inner ring D230 mm
Door Iron Plates
Stepper Motor
5 degrees of freedom
D390 mm
Gap 35mm
QD0
Door inner ring D230 mm
Door Iron Plates
Stepper Motor
5 degrees of freedom
D390 mm
Gap 35mm
460 mm
390 mm
Example (SiD) of QD0 support with 5-DOF magnet mover system
M. Oriunno, SLAC
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Integration of the “R20” region
“R20” region = all detectors within ~20cm of beamline):– beampipe, FCAL=LumiCal + Beamcal, Masking, Feedback BPMs
& Kickers, Vacuum pumps(?)
• Conceptual solution to support massive Lumical+mask+Beamcal cantilevered from nose of QD0– Effect on QD0 vibration stability– Precise and reproducible positioning of Lumical
R20 Detailed Schematic
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-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
0 0.5 1 1.5 2 2.5 3 3.5 4
QD0
Lumi(220 kg)
Mask (507 kg)
LowZee&Beamcal(136 kg)
Support Clam-shell
10mm steel
1616 mmØ392
QD0
Lumi(220 kg)
Mask (507 kg)
LowZee&Beamcal(136 kg)
Support Clam-shell
10mm steel
1616 mmØ392
Current Implementation of FCAL support & Alignment Movers
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Support and locomotion of SiD within the IR Hall
Hot Button Compatibility Issues with ILD tend to make this subject dominate MDI discussions
• Platform (or not) solution– Prejudice is that it exposes SiD to increased vibration risk
• Rollers, airpads, strand jacks• Height differenceGeneral agreement to try to move from “personal experience
based prejudices” to decision based on prototypes and measurements
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SiD Preferred Push/pull locomotion
Hilman rollers
Hilman rollersstrands jacks
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Off-the shelf Strand Jacks
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SiD on Half-Platform Stored in Lateral Alcoves (rejected)
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SiD on a platform(under study)
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Proposed Roller & Support Sceme for a Platform
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Four support lines for 4’000 tons each
View from below (Rollers)
10kt unitAnti-Seismic support
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Radiation Shielding design & associated calculations
Hinged Pacman to make SiD “Self-Shielded” when on beamline
20 R.L. Cu target in IP-14 mµSv/lost_train. 500 GeV, 9 MW
2010.03.28 SiD MDI-LCWS’10 T. Markiewicz/SLAC 19 of 21Mario Santana/SLAC
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Other “MDI” Topics Not Discussed Today
• Fringe Field specification & compliance• Calculation of & remediation of beam-beam backgrounds and
incoming beam backgrounds– Pairs from beamstrahlung– Muons from collimation– Synchrotron radiation Photons
• IR Hall Design– Sizes, Heights, Crane Capacity, Shaft diameters, etc.– Hall Services
• Cryo systems, power supplies, readout, racks, etc.
• Assembly Procedures– Above Ground (CMS) or below groud
• Sometimes “LEP”=Luminosity, Energy & Polarization measurement devices
• Sometimes the FCAL devices themselves
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Summary of ILC MDI• A complete conceptual MDI design is documented in the SiD LOI and
October 2009 talks at ALCPG’09 Albuquerque
• People involved:– Marco Oriunno ßßßß– Phil Burrows– Takashi Maruyamaßßßß– Mario Santana– Marty Breidenbach ßßßß– TWM
• SiD is not yet doing the kind of work required for an engineering design (e.g. 2012 TDR) nor keeping up (imho) with the quality of prototyping and measurements we are seeing from ILD and CLIC
• There are many areas where more help would be useful and welcome