TGEMS

Neutron_TGEM_Detector_Abdel

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 (we have 0.5 diameter boards in stock).

PCboard spacing = 1.5 - 2 mm (distance between the centers of 2 holes in parallel layers is 1mm).

[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

Test Setup 1

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

I used 2 Ortec timing amps to integrate the signal and amplify more than what we did for the standard GEM.

The following setttings were

Parameter	Dial setting
Timing Amp1	x20
Timing Amp1 Integration	50 ns
Timing Amp2	x4
Timing Amp2 Integration	20 ns
CFD Threshold	5.22
CFD Threshold ULD	5.28
CFD Threshold LLD	3.04

THGEM see through detector

File:D01072012 IonChamberDemo.jpg

GEM fission chamber tests

GEM_Fission_IAC_11082013

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