photoelectron extraction and collection efficiency studies in csi-thgem for ne based mixtures
DESCRIPTION
Photoelectron extraction and collection efficiency studies in CsI-THGEM for Ne based mixtures. C.D.R. Azevedo , M . Cortesi, A.V. Lyashenko, A. Breskin, R. Chechik, J. Miyamoto, V. Peskov, J. Escada, J.F.C.A. Veloso and J.M.F. dos Santos Physics Department – University of Aveiro - PowerPoint PPT PresentationTRANSCRIPT
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C.D.R. Azevedo, M. Cortesi, A.V. Lyashenko, A. Breskin, R. Chechik, J. Miyamoto, V. Peskov, J. Escada, J.F.C.A. Veloso and J.M.F. dos Santos
Physics Department – University of Aveiro
Physics Department – University of Coimbra
Weizmann Institute of Science
Photoelectron extraction and collection efficiency studies in CsI-THGEM for Ne based mixtures
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Motivation
• THGEM in Ne mixtures• High gain @ low voltages
reduced discharge probability discharge energy charging-up effects
• Single photoelectron detection capability• Collection and extraction efficiency• Effective photon detection efficiency
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Gain
0 200 400 600 800 1000 120010-2
10-1
100
101
102
103
104
105
106
107
E
ffect
ive
Gai
n
VTHGEM
(V)
Ne/5% CF4 Ne/10% CF4 Ne/5% CH4 Ne/10% CH4 Ne/23% CH4
Single THGEM (t = 0.4 mm, d = 0.3 mm, a = 0.7 mm, h = 0.1 mm)
Atm. pressureGas flow mode
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Extraction efficiency (εextr)
vac
gasextr I
I
0 2 4 6 8 10 120.4
0.8
1.2
1.6
2.0
2.4
2.8
Ivac Igas(Ne/10% CF4)
I(nA
)
EDrift
(kV/cm)
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Extraction efficiency (εextr)
0.0 0.5 1.0 1.5 2.0 2.5 3.00.4
0.5
0.6
0.7
0.8
0.9
1.0Atm. pressureGas flow mode
E
xtra
ctio
n ef
ficie
ncy
EDrift
(kV/cm)
CH4 CF4 Ne/10% CF4 Ne/5% CF4 Ne/10% CH4 Ne/5% CH4 Ar/5% CH4
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Photocathode Electric Field
-0.3 -0.2 -0.1 0.0 0.1 0.2 0.30
1
2
3
4
5E
lect
ric F
iled
(kV
/cm
)
Distance from center between holes (mm)
VTHGEM
= 500 V V
THGEM = 700 V
VTHGEM
= 900 V
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Collection efficiency (εcoll)
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Collection efficiency (εcoll)
ref
THGEMcoll N
N
0 5 10 15 20 25 30 35 40100
101
102
103
104
105
Cou
nts
Channel
ROI
Reference detector
Investigated detector
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Collection efficiency (εcoll)
200 300 400 500 600 700 800 900 10000.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2Atm. pressureGas flow mode
Single THGEM (t = 0.4 mm, d = 0.3 mm, a = 0.7 mm, h = 0.1 mm)
C
olle
ctio
n ef
ficie
ncy
VTHGEM
(V)
G=220 G=25 G=103 G=210 G=103
Ne/5% CF4 Ne/5% CH4 Ne/10% CF4 Ne/10% CH4 Ne/23% CH4
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Effective photon detection efficiency (εeffph)collextreffeffph AQE
Gas ∆VTHGEM(V) Gain QE 170nm Aeff εextr εcoll Εeffph
Ne/CH4(95/5) 800 5.4E4 0.3 0.54 0.73 1 0.12
Ne/CH4(90/10) 900 1.3E5 0.3 0.54 0.79 1 0.13
Ne/CF4(95/5) 750 6.0E5 0.3 0.54 0.76 1 0.12
Ne/CF4(90/10) 850 1.2E6 0.3 0.54 0.83 1 0.14
Gas ∆VTHGEM(V) Gain QE170nm Aeff εextr εcoll Εeffph
Ne/CH4(95/5) 800 5.4E4 0.3 0.91 0.73 1 0.20
Ne/CH4(90/10) 900 1.3E5 0.3 0.91 0.79 1 0.22
Ne/CF4(95/5) 750 6.0E5 0.3 0.91 0.76 1 0.21
Ne/CF4(90/10) 850 1.2E6 0.3 0.91 0.83 1 0.23
This geometry: t = 0.4 mm, a = 0.7 mm, d = 0.3 mm, h = 0.1 mm
Perspectives for optimized geometry: t = 0.4 mm, a = 1 mm, d = 0.3 mm, h = 0.01 mm
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Conclusions Gain > 105 were reached in all mixtures
106 in Ne/10%CF4
Extraction efficiency (εextr) > 72% @ 1.5 kV/cm83% @ 2 kV/cm in Ne/10%CF4
Full collection efficiency (εcoll) @ realistic operation conditions Effective photon detection efficiency 12 < εeffph < 14%
20% < εeffph < 23% with optimized geometry83% @ 2 kV/cm in Ne/10%CF4
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Thanks for your attention
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