GATING GEM

GDD Meeting December the 17th Gabriele Croci

Experimental Setup

2

8.9 keV Copper X-Rays

ED

ET1

ET2

ET3

EI

13 mm

2 mm

3 mm

2 mm

2 mm

Drift

Preamp GEM

Gating GEM

Bottom GEM 1

Bottom GEM 2

A

B

C

No PreAMP GEM Measurements

Pedestal

CB

3

No Pre GEM Scans

4

PreAmp GEM Spectrum

Pedestal

B C

A

5

PreGEM Voltage Scan

6

Gate GEM Scans with PG on

7

ET1 Scans

ΔVPreGEM = 380 V ΔVPreGEM = 400 V

ΔVPreGEM = 420 V

8

ED ScansΔVPreGEM = 380 V ΔVPreGEM = 400 V

ΔVPreGEM = 420 V

9

Current Measurements Setup

10

ED

ET1

ET2 = 0

ET3 = 0

EI = 0

13 mm

2 mm

3 mm

2 mm

2 mm

Drift

Preamp GEM

Gating GEM

Bottom GEM 1

Bottom GEM 2

8.9 KeV X-Ray

VGGb = -100

Ionization Current Measurement

11

Pre GEM Voltage Scan

12

Ed Scans

13

ET1 Scans

14