SCIPC WG5 (L0)

1. SCIPC WG5 (L0) Breese Quinn, Ela Barberis, Bill Cooper, Eric Kajfasz, Elizaveta Shabalina, Taka Yasuda, Eckhard von Toerne • 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 B. Quinn University 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) B. Quinn University of Mississippi

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% B. Quinn University of Mississippi

4. L0 Design: Expected Enhancement • Layer0 will recover b-tagging efficiencyto 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 B. Quinn University of Mississippi

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 B. Quinn University of Mississippi

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 • 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 B. Quinn University of Mississippi

7. L0 Design: Noise Control B. Quinn University of Mississippi

8. L0 Design: Noise Control • L0 module • L0 modules on grounded support structure B. Quinn University of Mississippi

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 year’s fall shutdown or during next year’s upgrade? • Pro: try to get as much done work ahead of time as possible • Con: difficult job – don’t remove the H disks twice if you don’t 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 B. Quinn University of Mississippi

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 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. B. Quinn University of Mississippi

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 B. Quinn University 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 B. Quinn University of Mississippi

13. L0 Software Overview • Huge number of tasks – ZERO names! ? ? controls ? ? ? ? ? ? ? ? ? ? ? ? ? B. Quinn University of Mississippi

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 B. Quinn University of Mississippi

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 B. Quinn University of Mississippi