SCIPC May 19, 2004 B. Quinn University of Mississippi 1 SCIPC WG5 (L0) 15:30Introduction (05') Breese Q. 15:35L0 Design Review (20') Andrei N. 15:55Pre-Inst. Plans (Fall shutdown) (20') Bill C. Lyn B. 16:15L0 Geometry MC (15') Lisa S. 16:30Review Inst. & Comm. Schedule (30') All 17:00Run IIa: What went right/wrong? (30')All Agenda: Monday 17 May 2004 Breese Quinn , Ela Barberis, Bill Cooper, Eric Kajfasz, Elizaveta Shabalina, Taka Yasuda, Eckhard von Toerne
SCIPC WG5 (L0). Breese Quinn , Ela Barberis, Bill Cooper, Eric Kajfasz, Elizaveta Shabalina, Taka Yasuda, Eckhard von Toerne. 15:30Introduction (05') Breese Q. 15:35L0 Design Review (20') Andrei N. - PowerPoint PPT Presentation
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SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
1
SCIPC WG5 (L0)
15:30 Introduction (05') Breese Q.
15:35 L0 Design Review (20') Andrei N.
15:55 Pre-Inst. Plans (Fall shutdown) (20') Bill C. Lyn B.
16:15 L0 Geometry MC (15') Lisa S.
16:30 Review Inst. & Comm. Schedule (30') All
17:00 Run IIa: What went right/wrong? (30')All
Agenda: Monday 17 May 2004
Breese Quinn, Ela Barberis, Bill Cooper, Eric Kajfasz, Elizaveta Shabalina, Taka Yasuda, Eckhard von Toerne
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
2
L0 Design: Run IIa status
We expect Layer 1 Micron sensors to begin to fail at exposures of ~ 3-4 fb-1
We are seeing continuing failures of readouts in the current detector (84% currently enabled)
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
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L0 Design: Physical
Detector must fit between radii of 16mm – beam pipe flange and 22.8mm – SMT support structure openings
6 phi segments, 8 z segments
48 HDIs x 256 channels
Phi acceptance 98.4%
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
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L0 Design: Expected Enhancement
Layer0 will recover b-tagging efficiency to original values before irradiation
If “no loss” model is assumed Layer0 improves b-tagging per jet by 15%
Improvement in vertex resolution allows considerable increase of Bs mixing reach
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
5
L0 Design: Pitch Adapter Concern
Change wrt Run2B design : pitch adapter1st prototype failed, vendor is trying again (due in a few weeks)
2nd vendor is being brought in to give it a try
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
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L0 Design: Noise Control
CDF L00 had negative experience using analog cables – large noise
Concluded that source of noise are poorly grounded conductors near sensors and analog cables
We’ve done a lot of R&D trying to avoid same mistakes
Found that low inductance ground connections are very important to equalize potential between different parts
Found a solution when Carbon Fiber support structure is forced to be at ground potential providing low inductance path
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
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L0 Design: Noise Control
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
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L0 Design: Noise Control
L0 module
L0 modules on grounded support structure
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
9
Fall Shutdown Plans: Mechanical
H disk removal/repairOnly two H disks will remain once L0 is installedAll four H disks have many unusable wedgesH wedges will be redistributed to make two “good” H disksShould the rebuilding of the H disks be done during this year’s fall shutdown or during next year’s upgrade?
Pro: try to get as much done work ahead of time as possibleCon: difficult job – don’t remove the H disks twice if you don’t have to
ConsiderationsBeam pipe risk – would have to be disconnected, not cutDo the H disks have to be removed for clearance measurements anyway?
Likely – see next slideIs there enough time/manpower to get it done in 13 weeks?
Lisa will ask Moscow for schedule estimateWhat are the physics risks of failure?
Eckhard is pursuing this
General consensus is we want it done now if at all possible
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
10
Fall Shutdown Plans: Mechanical
Measuring beam pipe region clearancesThere is some uncertainty about the reliability of the clearance numbers in hand
One extreme or the other:“Open heart surgery”: remove the beam pipe and probably H disks for direct measurement access
This does require that the beam pipe be cut
“MRI”: may be possible to map the membrane openings with tracksThis needs to be determined soon – by whom?
There is risk involved with beam pipe work, but I believe it comes down to two things:
If the mapping doesn’t work, this will be the last time to check the aperture. If we don’t and find out next year that it’s too small, the game is over.
There are very careful and capable people to do the work.
Software Download GUI needs to handle SVX4 chips (Bucholz)
Install more HV for L0Hardware (Prague?)
Have new HV pods and fanout boxes for L0 bias voltages
Need more cabling
SoftwareLots more mapping (Quinn)
Modify GUIs
Almost all of this work is in MCH2 – it can start immediately
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
12
L0 Geometry in Simulation
Implement new SMT geometry in D0gstar (D0 Geant)
Modify SMT hit storage interface (simpp)
Modify SMT hit digitization package (d0sim)
Modify SMT hit packing (into raw data chunk) (smtraw, smtutil, pack_reco)
Modify SMT cluster reconstruction packages
Modify reconstructiongeometry and track reconstruction
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
13
L0 Software Overview
Huge number of tasks – ZEROZERO names!
controls
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SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
14
L0 Software – Physics Commissioning
Huge number of tasks – ZEROZERO names!Need a non-trivial number of workers
Lisa & Ela are putting together a task list/manpower estimate
Will require push from management ala calorimeter group expansion
Need a “L0 Physics Commissioning” leader (Quinn – find, not be!)Responsible for encouraging tool development, but even more so for implementing a plan for studies using those tools to get physics quality data
Within the SMT/L0 group, parallel to Installation leaders (Bill, Lyn)
Integrated to the Algorithms/Tracking groups
SCIPCMay 19, 2004
B. QuinnUniversity of Mississippi
15
SCIPC WG5 (L0) Summary
Two major areas of concernPlanning for Fall 2004 shutdown activities
Get as much done as is reasonably possibleClearance measurementsH disk removal/repairCooling system studiesPhotography
Many decisions to be made in the next couple of weeksL0 Physics Commissioning
Run IIa did not provide a good model hereEnormous number of software tasks and no one is working on themNeed a person responsible for physics commissioning studies program within the group
OtherReview of existing Installation schedule taking place asynchronously offline. Will address it before Fresno