GEM

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APV 25 TEDF

General GEM Information

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


GEM class variables

  • Tree  :T  : Hall A Analyzer Output DST *
  • Entries : 50874 : Total = 2404513729 bytes File Size = 204721823 *
  •  :  : Tree compression factor = 11.77 *
  • Br 0 :T.gem.x1.hit.adc : data[Ndata.T.gem.x1.hit.adc]/D *
  • Entries : 50874 : Total Size= 417941 bytes File Size = 247905 *
  • Baskets : 20 : Basket Size= 32000 bytes Compression= 1.68 *
  • ............................................................................*
  • Br 1 :T.gem.x1.hit.pos : data[Ndata.T.gem.x1.hit.pos]/D *
  • Entries : 50874 : Total Size= 417941 bytes File Size = 173593 *
  • Baskets : 20 : Basket Size= 32000 bytes Compression= 2.40 *
  • ............................................................................*
  • Br 2 :T.gem.x1.hit.size : data[Ndata.T.gem.x1.hit.size]/D *
  • Entries : 50874 : Total Size= 417966 bytes File Size = 64792 *
  • Baskets : 20 : Basket Size= 32000 bytes Compression= 6.44 *
  • ............................................................................*
  • Br 3 :T.gem.x1.hit.type : data[Ndata.T.gem.x1.hit.type]/D *
  • Entries : 50874 : Total Size= 417966 bytes File Size = 41224 *
  • Baskets : 20 : Basket Size= 32000 bytes Compression= 10.12 *
  • ............................................................................*
  • Br 4 :T.gem.x1.strip.adc : data[Ndata.T.gem.x1.strip.adc]/D *
  • Entries : 50874 : Total Size= 98231855 bytes File Size = 17749252 *
  • Baskets : 3180 : Basket Size= 32000 bytes Compression= 5.53 *
  • ............................................................................*
  • Br 5 :T.gem.x1.strip.adc_p : data[Ndata.T.gem.x1.strip.adc_p]/D *
  • Entries : 50874 : Total Size= 98238225 bytes File Size = 69205992 *
  • Baskets : 3180 : Basket Size= 32000 bytes Compression= 1.42 *
  • ............................................................................*
  • Br 6 :T.gem.x1.nhits : T.gem.x1.nhits/D *
  • Entries : 50874 : Total Size= 417522 bytes File Size = 43319 *
  • Baskets : 104 : Basket Size= 4000 bytes Compression= 9.58 *
  • ............................................................................*
  • Br 7 :T.gem.x1.noise : T.gem.x1.noise/D *
  • Entries : 50874 : Total Size= 417522 bytes File Size = 341742 *
  • Baskets : 104 : Basket Size= 4000 bytes Compression= 1.21 *
  • ............................................................................*
  • Br 8 :T.gem.x1.nstrips : T.gem.x1.nstrips/D *
  • Entries : 50874 : Total Size= 417838 bytes File Size = 49291 *
  • Baskets : 105 : Basket Size= 4000 bytes Compression= 8.43 *
  • ............................................................................*


To plot amplitude for each strip :

T->Draw("T.gem.x1.strip.adc:Iteration$");

To look at amplitude ( total energy deposition )


T->Draw("T.gem.x1.hit.adc","T.gem.x1.hit.size>1");


Run List

PREX GEM Runs

Work to Do/Main issues

  • 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

GEM Meeting, 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

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

27696 Spot++ with T5 on lead 2

27697 Qsq lead 2

27698 Qsq lead 2

27699 Qsq lead 2

27700 Qsq lead 2

27701 Qsq lead 3

VDC Projection

http://www.jlab.org/~adaq/halog/html/1005_archive/100520164442.html


Beam data , June 11th, 2010

Run from 27792 to 27844 have the GEM in the datastream and with HV on

UVA Bottom 3650 V UVA Top 3700 V


INFN Bottom 4100 V UVA Top 3600 V

Pedestal run 27792

Pedestal check run 27793

Run # Target Ch0 (V) Ch1 (V) Ch2 (V) Ch3 (V) Current (uA) P0 (GeV) Comment
27792 No Target 3700 3650 3600 4100 0.03 1.063 Pedestal
27793 No Target 3700 3650 3600 4100 0.03 1.063 Pedestal Check
27795 Thin C12 3700 3650 3600 4100 0.03 1.063 Qsq
27796 Thin C12 3700 3650 3600 4100 0.03 1.063 Qsq
27797 Thick C12 3700 3650 3600 4100 0.03 1.063 Qsq
27798 Thin Pb 3700 3650 3600 4050 0.03 1.063 Qsq
27800 Thin Pb 3750 3650 3600 4050 0.03 1.063 Qsq
27801 Thin Pb 3800 3700 3600 4050 0.03 1.063 Qsq
27804 Thin C12 3800 3700 3600 4050 0.005 1.063 Qsq
27805 Thick C12 3800 3700 3600 4050 0.005 1.063 Qsq
27825 Thin Pb 3800 3700 3600 4050 0.005 1.063 Qsq
27826 Thin Pb 3800 3700 3600 4050 0.005 1.063 Qsq
27827 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq
27828 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq
27829 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq
27830 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq (0x00)
27831 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq(0x8)
27832 Thin Pb 3800 3700 3600 4050 0.05 1.073 Qsq(0x10)
27833 Thin Pb 3800 3700 3600 4050 0.05 1.083 Qsq(0x18)
27834 Thin Pb 3800 3700 3600 4050 0.05 1.083 Qsq(0x1c)
27835 Thin Pb 3800 3700 3600 4050 0.05 1.083 Qsq
27836 Thin Pb 3800 3700 3600 4050 0.05 1.073 Qsq
27837 Thin Pb 3800 3700 3600 4050 0.05 1.084 Qsq
27838 Thin Pb 3800 3700 3600 4050 0.05 1.1 Qsq
27839 Thin Pb 3800 3700 3600 4050 0.05 1.13 Qsq
27840 Thin Pb 3800 3700 3600 4050 0.05 1.13 Qsq
27841 Thin Pb 3800 3700 3600 4050 0.05 1.168 Qsq
27842 Thin Pb 3800 3700 3600 4050 0.05 1.122 Qsq
27843 Thin Pb 3800 3700 3600 4050 0.05 1.121 Qsq


Efficiencies and VDC correlations

http://www.jlab.org/~adaq/halog/html/1006_archive/100613235755.html

http://www.jlab.org/~adaq/halog/html/1006_archive/100614000351.html

http://www.jlab.org/~adaq/halog/html/1006_archive/100614000759.html

http://www.jlab.org/~adaq/halog/html/1006_archive/100614001232.html

GEM amplitude

http://www.jlab.org/~adaq/halog/html/1006_archive/100611191212.html

Beam data , June 15th, 2010

Run # Target Ch0 (V) Ch1 (V) Ch2 (V) Ch3 (V) Current (uA) P0 (GeV) Comment
27884 Lead/ Diamond #1 3700 3650 3600 4100 0.03 1.063 Data
27885 Lead/ Diamond #1 3700 3650 3600 4100 0.03 1.063 Pedestal with beam
27886 Lead/ Diamond #1 3700 3650 3600 4100 0.03 1.063 - 2% Qsq -2%
27887 Lead/ Diamond #1 3700 3650 3600 4100 0.03 1.063 -3% Qsq -3 %
27797 Thick C12 3700 3650 3600 4100 0.03 1.063 Qsq
27798 Thin Pb 3700 3650 3600 4050 0.03 1.063 Qsq
27800 Thin Pb 3750 3650 3600 4050 0.03 1.063 Qsq
27801 Thin Pb 3800 3700 3600 4050 0.03 1.063 Qsq
27804 Thin C12 3800 3700 3600 4050 0.005 1.063 Qsq
27805 Thick C12 3800 3700 3600 4050 0.005 1.063 Qsq
27825 Thin Pb 3800 3700 3600 4050 0.005 1.063 Qsq
27826 Thin Pb 3800 3700 3600 4050 0.005 1.063 Qsq
27827 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq
27828 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq
27829 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq
27830 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq (0x00)
27831 Thin Pb 3800 3700 3600 4050 0.05 1.063 Qsq(0x8)
27832 Thin Pb 3800 3700 3600 4050 0.05 1.073 Qsq(0x10)
27833 Thin Pb 3800 3700 3600 4050 0.05 1.083 Qsq(0x18)
27834 Thin Pb 3800 3700 3600 4050 0.05 1.083 Qsq(0x1c)
27835 Thin Pb 3800 3700 3600 4050 0.05 1.083 Qsq
27836 Thin Pb 3800 3700 3600 4050 0.05 1.073 Qsq
27837 Thin Pb 3800 3700 3600 4050 0.05 1.084 Qsq
27838 Thin Pb 3800 3700 3600 4050 0.05 1.1 Qsq
27839 Thin Pb 3800 3700 3600 4050 0.05 1.13 Qsq
27840 Thin Pb 3800 3700 3600 4050 0.05 1.13 Qsq
27841 Thin Pb 3800 3700 3600 4050 0.05 1.168 Qsq
27842 Thin Pb 3800 3700 3600 4050 0.05 1.122 Qsq
27843 Thin Pb 3800 3700 3600 4050 0.05 1.121 Qsq
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