# Presentation: 158504

## News

- Collision Hall Access
- A special access list + D0 Hazard Awareness + Gert for now
- Changes to MCH3 Power Distribution pending
- Muon Commissioning Leaders
- Post-Docs and senior graduate students with a big role in commissioning. Role is:
- to assist in commissioning organization especially integration
- to assist in shift training
- Steve Doulas, Rob McCroskey, & Dennis Shpakov

## Gas System
At Present
Ar(80%)-CH4(10%)-CF4 (10%) Gas in 1st 6 PDT’s
Most PDT’s are leak-checked.
Design
 Clean and Dirty Gas systems are finished (JK) and approved by HH, TD, KK.
Design for Gas Recycler/Cryogenic Cleaning has started (JK)
Running at full speed (4 liters per minute per pdt) in one pass mode is too expensive
Late Developing Problem has come up
80-10-10 is flammable (barely) in air.
Considering mixtures of Ar-CO2-CF4 and mixtures with less methane e.g. Ar(82%)-CH4(8%)-CF4(10%)
For now - pdt hv is off until Monday (slow gas) at which time we will have 6 PDT’s on Argon-C02  which has a 1.2 microsec max drift time.

- At Present
- Ar(80%)-CH4(10%)-CF4 (10%) Gas in 1st 6 PDT’s
- Most PDT’s are leak-checked.
- Design
-  Clean and Dirty Gas systems are finished (JK) and approved by HH, TD, KK.
- Design for Gas Recycler/Cryogenic Cleaning has started (JK)
- Running at full speed (4 liters per minute per pdt) in one pass mode is too expensive
- Late Developing Problem has come up
- 80-10-10 is flammable (barely) in air.
- Considering mixtures of Ar-CO2-CF4 and mixtures with less methane e.g. Ar(82%)-CH4(8%)-CF4(10%)
- For now - pdt hv is off until Monday (slow gas) at which time we will have 6 PDT’s on Argon-C02  which has a 1.2 microsec max drift time.

**PDT Commissioning**

## Gas System Design 

## PDT Infrastructure

- 58+/94th’s PDT’s have finished cables - remaining underway (no update) though I know Herman, Tom M., Carl Lundberg and Victor Bogyagin have made progress
- Electronics (no update)
- 90/94th’s LVPS’s installed + tested
- 84/94th’s FEB’s installed
- 18/94th’s Control Cards installed
- Monitoring, Control, Readout
- Hardware database increased to 94 PDT’s.
- Plague of problems suppressed (SH, FB, TD)
- COMICS download of Front-Ends updated

## All files copied to domino directory /prj_root/808/mtst_1/group_datafiles
Module ID problem in data
Some anecdotal evidence regarding crashes
Get more events before crash if less PDT’s have data
Get fewer events before crash if L1 rate is higher
Lately, PDT 121 seems to be the culprit (I didn’t always check which had died). 
104870, 104901, 104903 sent to reco farm. Probably a D0 daq milestone!
Short Term Plan for this week
study crashes in the first 6 PDT’s 
commission L3 filter on events with PDT data
Reposition the adc and time gates a little later Tested positions. 
add A-layer top east PDT’s continues

- Module ID problem in data
- Some anecdotal evidence regarding crashes
- Get more events before crash if less PDT’s have data
- Get fewer events before crash if L1 rate is higher
- Lately, PDT 121 seems to be the culprit (I didn’t always check which had died).
- 104870, 104901, 104903 sent to reco farm. Probably a D0 daq milestone!
- Short Term Plan for this week
- study crashes in the first 6 PDT’s
- commission L3 filter on events with PDT data
- Reposition the adc and time gates a little later Tested positions.
- add A-layer top east PDT’s continues

**Data Taking w/ 6 PDT’s**

## Aphi and Cosmic Cap

- First (East side) of two central muon readout crates is stable and has been readout many times.
- West Side has all connections and cards (borrowed FMU’s MFC) including VBD. I believe the PC needs a little setup.
- Steve, Dennis, + Vladimir working on electronics pulsing and LED pulsing in local data-taking mode.
- Plan for this week:
- Change trigger from “or-of-ors” to “or-of-ands” for Cosmic Cap cosmic runs. Done.
- Readout west scint crate  Close.
- Readout east + west scint crates together.
- Continue to develop local data-taking and pulsing.

## 6 PDT Cosmics Runs
HV nominal, xad pipelines
104809 -1467 events, FEB crashed
104815 -1367 events, FEB crashed
CFG.dat confusion
6 PDT Cosmics Special Runs
104869 -543 events, HV for 111, 211 off      FEB crashed
104870 -4561 events, HV for 111,211,121,221 was off, ended normally.
104871 -1051 events, HV for B-layer off
CFG.dat file: 211, 111, 221, 121, 231, 131
6 PDT Cosmics Runs
HV nominal, xad pipelines
104901 -839 events, FEB crashed
104903 - 340 events, FEB crashed

- HV nominal, xad pipelines
- 104809 -1467 events, FEB crashed
- 104815 -1367 events, FEB crashed
- CFG.dat confusion
- 6 PDT Cosmics Special Runs
- 104869 -543 events, HV for 111, 211 off      FEB crashed
- 104870 -4561 events, HV for 111,211,121,221 was off, ended normally.
- 104871 -1051 events, HV for B-layer off
- CFG.dat file: 211, 111, 221, 121, 231, 131
- 6 PDT Cosmics Runs
- HV nominal, xad pipelines
- 104901 -839 events, FEB crashed
- 104903 - 340 events, FEB crashed

**Data Taking w/ 6 PDT’s**