TGEMS

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

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

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

Descriminated signals

HV setting

Cathode HV (Volts)	First THGEM foil(Volts)	Second THGEM foil(Volts)	Third THGEM foil(Volts)	Third THGEM foil current [math]\displaystyle{ \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

File:Positive Pulse THGEMD strips and pulse from CFD HV3000Volts 11-9-08.pngFile:Ring from THGEMD strips and pulse from CFDisc HV3000Volts 11-9-08.png

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