SCIPC

1
SCIPC WG5 (L0)
Breese Quinn, Ela Barberis, Bill Cooper, Eric
Kajfasz, Elizaveta Shabalina, Taka Yasuda,
Eckhard von Toerne
Agenda Monday 17 May 2004

• 1530 Introduction (05')    Breese Q. 
• 1535 L0 Design Review (20')    Andrei
  N.
• 1555 Pre-Inst. Plans (Fall shutdown) (20')   
  Bill C. Lyn B.
• 1615 L0 Geometry MC (15')    Lisa S. 
• 1630 Review Inst. Comm. Schedule (30') All 
• 1700 Run IIa What went right/wrong? (30')All

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)

3
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

4
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

5
L0 Design Pitch Adapter Concern

• Change wrt Run2B design pitch adapter
• 1st prototype failed, vendor is trying again (due
  in a few weeks)
• 2nd vendor is being brought in to give it a try

6
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
• Weve done a lot of RD 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

7
L0 Design Noise Control
8
L0 Design Noise Control

• L0 module
• L0 modules on
  grounded support
  structure

9
Fall Shutdown Plans Mechanical

• H disk removal/repair
• Only two H disks will remain once L0 is installed
• All four H disks have many unusable wedges
• H wedges will be redistributed to make two good
  H disks
• Should the rebuilding of the H disks be done
  during this years fall shutdown or during next
  years upgrade?
• Pro try to get as much done work ahead of time
  as possible
• Con difficult job dont remove the H disks
  twice if you dont have to
• Considerations
• Beam pipe risk would have to be disconnected,
  not cut
• Do the H disks have to be removed for clearance
  measurements anyway?
• Likely see next slide
• Is there enough time/manpower to get it done in
  13 weeks?
• Lisa will ask Moscow for schedule estimate
• What are the physics risks of failure?
• Eckhard is pursuing this
• General consensus is we want it done now if at
  all possible

10
Fall Shutdown Plans Mechanical

• Measuring beam pipe region clearances
• There 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 tracks
• This 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 doesnt work, this will be the
  last time to check the aperture. If we dont and
  find out next year that its too small, the game
  is over.
• There are very careful and capable people to do
  the work.

11
Fall Shutdown Plans Electrical

• Install 1-4 L0 modules
• Hardware installation (Bagby, Foglesong)
• Sensor modules in gaps on the horseshoe
• Power supplies in the cathedral
• SEQC firmware installed
• Software
• Download GUI needs to handle SVX4 chips (Bucholz)
• Install more HV for L0
• Hardware (Prague?)
• Have new HV pods and fanout boxes for L0 bias
  voltages
• Need more cabling
• Software
• Lots more mapping (Quinn)
• Modify GUIs
• Almost all of this work is in MCH2 it can start
  immediately

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

13
L0 Software Overview

• Huge number of tasks ZERO names!

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controls
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14
L0 Software Physics Commissioning

• Huge number of tasks ZERO 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

15
SCIPC WG5 (L0) Summary

• Two major areas of concern
• Planning for Fall 2004 shutdown activities
• Get as much done as is reasonably possible
• Clearance measurements
• H disk removal/repair
• Cooling system studies
• Photography
• Many decisions to be made in the next couple of
  weeks
• L0 Physics Commissioning
• Run IIa did not provide a good model here
• Enormous number of software tasks and no one is
  working on them
• Need a person responsible for physics
  commissioning studies program within the group
• Other
• Review of existing Installation schedule taking
  place asynchronously offline. Will address it
  before Fresno
• Revise Installation status
• Include Commissioning schedule
• SMT/L0 Integration needs to happen on a short
  timescale