Difference between revisions of "GEM"
(→Commissioning Meeting Summary) |
(→Meeting , May 17th, 2010) |
||
Line 140: | Line 140: | ||
[http://www.jlab.org/~mfriend/GEMs/ Megan's plots] | [http://www.jlab.org/~mfriend/GEMs/ Megan's plots] | ||
+ | |||
+ | === [[Beam data , May 19th, 2010]] === | ||
+ | HV | ||
+ | |||
+ | http://www.jlab.org/~adaq/halog/html/1005_archive/100519220407.html | ||
+ | |||
+ | UVA Bottom 3550 V | ||
+ | UVA Top 3600 V | ||
+ | |||
+ | |||
+ | INFN Bottom 4000 V | ||
+ | UVA Top 3600 V | ||
+ | |||
+ | http://www.jlab.org/~adaq/halog/html/1005_archive/100519221308.html | ||
+ | |||
+ | 27692 pedestal | ||
+ | |||
+ | 27697 Qsq | ||
+ | |||
+ | 27698 Qsq | ||
+ | |||
+ | 27699 Qsq | ||
+ | |||
+ | 27700 Qsq | ||
+ | |||
+ | 27701 Qsq |
Revision as of 22:21, 19 May 2010
Contents
General GEM Information
- NIM Papers
- PDG Accelerator Detector Review (See Section 28.6.3)
- Super BigBite CDR
Presentations
http://www.jlab.org/~cisbani/SBS_Tracker.pdf
GEM Detectors for PREX
Configuration
The GEMs were mounted in an XY XY XY XY configuation on April 14. Our best guess at positions (from Dustin) in the rotated coordinate system are:
Detector | Orientation | z (m) |
Bottom UVA | XY | 1.15 |
Top UVA | XY | 1.15 |
Bottom INFN | XY | 1.4 |
Top INFN | XY | 1.4 |
Chambers are placed orthogonal to the z axis.
HV Adjustment
Individual chamber HV is controlled through a CAEN N1471 NIM module. It can be remotely controled through minicom on ahut. The channel mapping is
http://www.jlab.org/~adaq/halog/html/1004_archive/100414225720.html
Channel | Cable | Detector |
0 | 7 | Top UVA |
1 | 8 | Bottom UVA |
2 | FPP7 | Top INFN |
3 | FPP6 | Bottom INFN |
Gas configuration
The gas is presently a 80-20 Argon/CO2 mix (or 70/30?).
Replaying Data and Software
Replaying data can be done on any of the adaq machines. Simply do
goprex analyzer prex_gem_L.C
and enter in the run number and number of events you would like to analyze. The database for the GEMs is in the $DB_DIR directory. This replay uses the TreeSearch-GEM library for GEM decoding, clustering, and tracking maintained by Ole Hansen.
Replayed files go in the rootfiles directory and are named
prex_gem_L_xxxxx.root
Run List
Work to Do/Main issues
- HV Scan
- Pedestal analysis (Francesco Cusanno)
- Stability
- Event-by-event corrections algorithm
- Higher order event-by-event corrections
- HV/Rate dependence
- Pedestal value/widths to find bad channels
- Cluster Analysis
- Multiple cluster propagation across planes
- Clusters energy association between planes, noise evaluation
- Position Resolution (Ozgur Ates)
- Evaluate plane resolution
- Different ways to utilize energy information to maximize resolution(?)
- Efficiency/Gain Analysis (Kiad)
- Evaluate hit efficiency vs. ADC cuts
- Efficiency, gain vs. strip
- Efficiency, gain vs. HV
- Gain differences in readout planes
- Tracking (Ole + Kiad)
- Quantify X-Y hit association techniques
- Bad Channels Handling (Ole)
- List to ignore in software
- How they affect clustering/energy weighting
Commissioning Meeting Summary
Analysis status, April 19, 2010
Listed projects that need to be finished for GEM tracking and divided among students/postdocs/staff.
Seamus' HALOG post on status:
http://www.jlab.org/~adaq/halog/html/1004_archive/100416175501.html
Analysis status, April 26, 2010
Source runs, April 27, 2010
http://www.jlab.org/~adaq/halog/html/1004_archive/100427134612.html
Beam data, May 5th, 2010
Run 27605 to 27610
http://www.jlab.org/~adaq/halog/html/1005_archive/100507142643.html
UVA bottom 3600 V UVA top 3750 V
Meeting , May 17th, 2010
Beam data , May 19th, 2010
HV
http://www.jlab.org/~adaq/halog/html/1005_archive/100519220407.html
UVA Bottom 3550 V UVA Top 3600 V
INFN Bottom 4000 V
UVA Top 3600 V
http://www.jlab.org/~adaq/halog/html/1005_archive/100519221308.html
27692 pedestal
27697 Qsq
27698 Qsq
27699 Qsq
27700 Qsq
27701 Qsq