1. Colliding Beams Group Involvement In CMS (see also M
Colliding Beams Group Involvement In CMS (see also M. Paulini’s talk on the Counter Group’s CMS Work)
T. Ferguson
DOE Review August 29, 2007

2. Outline Personnel CMS Detector and Endcap Muon System
Installation Work
Software/Analysis Work
Database Work
Future Plans
DOE Review August 29, 2007

3. CMU Faculty T. Ferguson – spends about 90% of time on CMS.
Have been US Endcap Muon Institution Board Chairman for the last 8 years.
H. Vogel and R. Briere – spend only about 5% of time on CMS. Mostly CLEO.
DOE Review August 29, 2007

4. Research Scientists 1) Nikolai Terentiev (8/98 – present)
Previously a senior PNPI physicist - had worked at Fermilab for over 15 years. Works 100% on CMS.
Our contact person at Fermilab. Does analysis of
calibration and test beam data, and software development.
2) Igor Vorobiev (4/00 – present)
Previously a senior physicist with ITEP/Moscow working on L3. Works 100% on CMS.
Our contact person at CERN. Expert on Databases. Has set-up and maintains 6 different databases for the CMS Endcap Muon system. Also on the overall CMS Database Advisory Committee
DOE Review August 29, 2007

5. Graduate Students
Ryan Carroll – Third-year student. Has finished all his classes and passed his qualifying exams. Will be moving to CERN this fall.
Bora Akgun – Third-year student. Transferred from the Univ. of Pittsburgh. Needs one more semester of courses and to pass a qualifying exam in January. Will move to CERN after that.
Both students spent the summer 2007 at CERN working on the installation of the CMS detector.
DOE Review August 29, 2007

6. CMS Detector
DOE Review August 29, 2007

7. Schematic of one endcap muon disk, showing the 4 layers of chambers.
CMS Endcap Muon System
Schematic of one endcap muon disk, showing the 4 layers of chambers.
DOE Review August 29, 2007

8. CMS Endcap Muon System 396 Cathode Strip Chambers (CSCs)
144 Large CSCs (3.4x1.5 m2):
72 ME2/2 chambers
72 ME3/2 chambers
144 Small CSCs (1.8x1.1 m2):
72 ME1/2 chambers
72 ME1/3 chambers
o CSCs (1.9x1.5 m2):
36 ME2/1 chambers
36 ME3/1 chambers
36 ME4/1 chambers
Front-end Electronics:
200k Cathode channels
160k Anode channels
DOE Review August 29, 2007

9. Endcap Muon Electronics
FED Crate in XSC55
Trig Motherboard (UCLA)
Clock Control Board
(Rice)
DAQ Motherboard (Ohio State)
DDU Board (Ohio State)
Anode Front-end Board
(CMU/PNPI)
Anode LCT Board
(UCLA, CMU/PNPI)
Cathode Front-end Board (Ohio State)
PA/SH ASIC (Ohio State)
SCA ASIC (UC Davis)
Comparator ASIC (UCLA/CERN)
LV Dist Board
(Wisc, UCD)
Custom Backplane
(Florida)
Slow Control (Ohio State, UCR)
CSC
CFEB
ALCT
1 of 24
1 of 2
LVDB M P C D B T O N R L E
DOE Review August 29, 2007

10. All Endcap Muon Chambers Installed
DOE Review August 29, 2007

11. Summary Table of Problems
Disc
Installed
Commissioned
Problems
Plane Cross-talk
AFEB
Cable probl
LVBD-LVMB
AFEB ch dead,
short
CFEB Noise
YE-1 36 1
YE-2
108 13 8 2
YE-3 18
YE+1 72
YE+2 15 4 9
YE+3
- Must be repaired
- Can be ignored
- Can be fix, but needs board replacement or taking a chamber down
DOE Review August 29, 2007

12. Completed ME-1 Disk
DOE Review August 29, 2007

13. Layout for Magnet Test and Cosmic Challenge (MTCC)
~2/9 of HB (~280°)
2 ECAL (~40°)
~1/24 of HE (~30°)
MTCC #1 only
MTCC #1 and #2
~1/12 of CSCs (~60°)
~1/20 of DT (~60°)
Tracker (~1%)
DOE Review August 29, 2007

14. Summary of MTCC Running July – October 2006
Accumulated Events per Trigger Cocktail
Accumulated CSC/DT triggered Events per B-field
Stable Operation
24/7 shift crew operation
Large amount of cosmic events recorded for various B-field settings
Muon Endcap actively participated both in the trigger and data readout
Summary of triggers collected per B-field
DOE Review August 29, 2007

15. MTCC Online Event Display
CSC–CSC/TF–GMT–GT triggered event
CSC/DT–GMT–GT trigger integration, with Global DAQ readout
Run 4593#52618
Ilaria Segoni, Dan Holmes, et al.
CSC+DT triggered event
(using GMT+GT)
DOE Review August 29, 2007

16. Lowering of Endcap Disks and Central Barrel into Pit, Nov. 06 – Feb. 07

17. Good Publicity for Endcap Muon System
DOE Review August 29, 2007

18. CMS Schedule (fall & winter)
October ‘07
Tracker will be inserted
tables on both ends of vac tank, no access for + endcap
November, December ‘07
Lower the 3 - endcap disks into pit
January ‘08
Beam pipe insertion - will need to move endcap disks back and forth
Access for installing mini-cable chains and pipes/cables may be poor
February ‘08
Install pixel barrel and forward detectors
DOE Review August 29, 2007

19. Work of Nikolai Terentiev
Wrote complete package for validating the simulation of hits in all 3 types of CMS muon chambers – CSCs, DTs and RPCs.
Improved the CSC raw-data digitization code to include read-out and unpacking error codes – first CMS subdetector to do this.
Did gas gain stability study of CSCs to measure their stability.
Compared measured chamber parameters between the MTCC and FAST site tests to check for stability and for any problems with the MTCC tests.
Measured time offsets for anode electronics – needed for accurately tagging of correct beam crossing.
Worked on automating and analyzing the anode electronics calibration programs.
DOE Review August 29, 2007

20. CSC Gas Gain Stability in MTCC
Monitoring CSC gas gain.
Mean ADC Sum(i) – Mean ADC Sum(Ref) vs days in MTCC1 and MTCC for ME+2/2/32 as 3D plot (color represents the bin occupancy in Z).
DOE Review August 29, 2007

21. CSC Gas Gain Stability in MTCC
Monitoring CSC gas gain (cont’d).
Ratio R=(Mean ADCSum(i)) / (Mean ADCSum(Ref)) for all gas gain locations in all CSCs in all MTCC data. Note: RMS = 0.08 and MEAN = 1.04.
Equivalent Delta(HV) distribution. Note:
RMS~14 V (~0.4% of HV setting of 3600 V).
DOE Review August 29, 2007

22. Comparison of Gas Gain in MTCC and FAST Site Tests
Relative gas gain spread in MTCC and FAST.
Instead of direct comparison of the gas gains use gas gain spread defined relatively to the average per CSC.
For each gas location in all CSC find voltage offset equalizing gas gain in CSC:
Delta(HV) = -190 * ln(R) where R=(Landau peak(i)) / (Average Landau peak).
Good correlation between MTCC and FAST site tests. MEAN ~ 1 V, RMS ~ 25V for difference in Delta(HV).
DOE Review August 29, 2007

23. Anode Timing Distributions
Probability to get all 6 anode hits within
a certain number of 25 ns beam crossings.
DOE Review August 29, 2007

24. Anode Timing Resolution
DOE Review August 29, 2007

25. I. Vorobiev Database Work
1. I. Vorobiev is a leader in CMS database work. He is the only real database person in the endcap muon group.
2. Set up web sites for CERN chamber tests and test beam runs.
3. Set up endcap muon construction database with all cables, chamber and electronics information in it.
4. Wrote Test Beam database with all run conditions and chamber configurations in it.
5. Set up Equipment Management database which will contain information on entire CMS detector – for French nuclear authorities.
6. Now setting up conditions database, which will contain all information needed for running the detector. Testing it using slice test running.
7. Also writing a configuration database, which will contain all data describing the set-up of the detector elements for each run.
DOE Review August 29, 2007

26. CSC Databases Conditions Calibrations and Tests
Detector Control System (DCS) information, Alignment
Configuration
Mapping
Detector Description (CMS)
Equipment Management (EMDB) (CMS)
Construction databases
FAST Site Databases
Electronic Board Inventory
CSC Tracking
Equipment Production DBs (AFEB, ALCT, TMB, RAT, HV)
DOE Review August 29, 2007

27. Database Web Page http://cmsdoc.cern.ch/CSC/CERN/db.html EMU/CSC
DOE Review August 29, 2007

28. Dataflow of Non-Event Data
ORCON (Point 5)
ORCOFF (CERN) T0 T1 T2
(From Frank Glege)
DOE Review August 29, 2007

29. Configuration and Conditions Data
Configuration data are data needed to bring the detector into any running mode, e.g., HV settings for power supplies and programmable parameters for front-end electronics. Configuration data require version and tag as meta-data (data that describes the data). Database set-up is under the control of the individual sub-detectors.
Conditions data have 2 main uses: 1) Post-mortem analysis of detector conditions (online); 2) Event reconstruction and data quality monitoring (offline). Offline conditions are a subset of online conditions. Conditions data require interval of validitiy (IOV), version, and tag as meta-data. Database set-up is under the control of the individual sub-detectors.
DOE Review August 29, 2007

30. Configuration Database Schema
DOE Review August 29, 2007

31. Configuration Database Web Interface
DOE Review August 29, 2007

32. Conditions Database
To store information on calibration and electronics performance monitoring.
AFEB - 14 tests, 18 numbers per channel + 12 per board.
CFEB – 18 tests, (96+32) numbers per channel + 75 per chamber.
ALCT – 4 tests, 384 numbers bytes per board.
TMB – 4 tests, 960 numbers bytes per board.
Calibration objects are transferred from Online to Offline to be used
in reconstruction.
DOE Review August 29, 2007

33. Mapping Database
Conversion of electronic addresses in peripheral crates to chamber addresses and vice versa.
DOE Review August 29, 2007

34. Future Plans
1) Continue work on calibration programs and online monitoring of anode electronics for actual running.
2) Continue work on writing CMS reconstruction software.
3) Continue analyzing MTCC data (N. Terentiev was at CERN for 2 months this summer).
4) Complete databases needed for configuring detector and saving running conditions.
5) Get new graduate students started on CMS software and analysis. Both have taken introductory courses at FNAL.
6) Continue helping with the installation and commissioning of the endcap muon system in preparation for the first collisions in June 2008.
DOE Review August 29, 2007

35. Request for Additional CMS Post-doc Position
CLEO data-taking will finish in March Present CLEO post-doc will finish soon after that.
This is a crucial time for CMS experiment. Estimate is that the Endcap Muon system needs about 20 FTEs more.
With 2 graduate students stationed at CERN, we need another permanent person there to help supervise them when their advisor is not there.
We request short-term funds to hire an additional CMS post-doc until the present CLEO post-doc finishes.
DOE Review August 29, 2007