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

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%

SCIPCMay 19, 2004

B. QuinnUniversity of Mississippi

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

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

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

SCIPCMay 19, 2004

B. QuinnUniversity of Mississippi

7

L0 Design: Noise Control

SCIPCMay 19, 2004

B. QuinnUniversity of Mississippi

8

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.

SCIPCMay 19, 2004

B. QuinnUniversity 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 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

Revise Installation statusInclude Commissioning schedule

SMT/L0 Integration needs to happen on a short timescale