Difference between revisions of "TGEMS"

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Revision as of 22:57, 10 October 2008

TGEMS : defined as GEM detector which use thick PCboard (0.4 mm thick) size GEM preamplifiers with hole diameters between 0.5 and 1 mm.

PCboard spacing = 1.5 - 2 mm.

[1], Media:01352098.pdf

TGEM Detector HV setting

[2]Media:Development_of_Tracking_Detectors_with_industrially_produced_GEM_Foils.pdf

[math]V_{GEM} = 0.103 \times V_{Drift}[/math]

[math]V_{GEM}[/math] is between ~[300V, 600V] for [math]CF_4[/math] and for [math]Ar/CO_2[/math] it is [200V, 370V];

[math]V_{Drift}[/math] voltage is ~[2900V, 5800V] ([1950V, 4000V]) for [math]CF_4[/math] ([math]Ar/CO_2[/math]).

TGEM detector.jpgTGEM detector 1.jpg

TGEM Detector TGEMfoil 1.jpgTGEM Detector TGEMfoil 2.jpgTGEM Detector TGEMfoil 3.jpg
TGEM Detector cathode.jpgTGEM Detector.jpg

Descriminated signals

HV setting

Cathode HV (Volts) First THGEM foil(Volts) Second THGEM foil(Volts) Third THGEM foil(Volts) Third THGEM foil current [math]\mu[/math]A
3000 1756 1657 1652 1273


Descriminator setup

I used 2 timing amps to integrate the signal and amplify more then the basic GEM.

The following setttings were

Parameter Dial setting</math>A
Timing Amp1 20
Timing Amp1 Integration 50 ns
Timing Amp2 4
Timing Amp2 Integration 20 ns
CFD Threshold 5.22
CFD Threshold ULD 5.28
CFD Threshold LLD 3.04



Pulse from THGEMD strips and CFD HV3000Volts 11-9-08.pngPulse from THGEMD strips and nothing from CFDisc HV3000Volts 11-9-08.png

300px300px

Noise from THGEMD strips and pulse from CFD HV3000Volts 11-9-08.pngNoise from THGEMD strips and no pulse CFD HV3000Volts 11-9-08.png



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