Test beam strategy Tomohiro Yamazaki - Indico

Test beam strategy
Tomohiro Yamazaki
3rd Jul. 2015
Test Beam at CERN
日程
GIF++ 19th Aug - 1st Sep (14 days)
H8 26th Aug - 14th Sep (19 days)
参加者 from Japan
越智(8/28-9/15)，片岡，増渕，齋藤，川本
山根(-9/13)，山内(-9/4)，長坂(-9/15)，長谷川(-9/4)，斉藤 (9/15?): 8/17山崎，山谷 : 8/11 – 9/15
木村，清野 : 8/4 – 8/27
03/07/2015
Test beam strategy
2
Chambers
alpha
J11
J12
J13
J14
J15
J16
J17
J18
EN
EN
EN
HN
HN
HN
EN
HN
Kobe
Kobe
ICEPP
ICEPP
ICEPP
Kobe
X-ray
neutron
GIF++
H8
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
alpha, X-ray を当てたchamberのパフォーマンスをH8 or GIFでみたい
Resolution 出すのに，Tmm をテレスコープとして使う？
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Background Simulation (Flux)
Background task force http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/RADIATION/gen-2005-001-feb05.pdf
Gamma flux
25 kHz/cm2
L = 1×1034 cm-2s-1
HL-LHC:
125 kHz/cm2
The n and γ fluences are in units of kHz/cm2 and the μ and p fluences in Hz/cm2 .
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Previous Study at Saclay (2011)
Gamma irradiation (R17a chamber)
arXiv:1301.7648
60Co
(1.17 MeV and 1.33 MeV) 268 GBq
50 cm from source → Flux : 1.7×107 Hz/cm2
Integrated photon flux : 3×1013 photons/cm2
( Total integrated charge : 15 mC/cm2 )
→ Integrated photon flux corresponds to HL-LHC 10 years with security factor 3
Gain
480 hours irradiation
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Previous Study at Saclay (2011)
Performance after irradiation
SPS H6 beam line
R17a chamber : exposed ( X-ray, neutron, gamma, alpha)
R17b chamber : unexposed
Tmm chambers for tracking
Resolution
Efficiency
Error-bars represent the standard deviation of the different scans
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GIF++
GIF++ seminar : https://indico.cern.ch/event/387753/
137Cs
(662 keV) 14 TBq
Expected current (10×10 cm2)
5.6 μA (1m), 1.4 μA (2m), 0.62 μA (3m)
Gamma Flux
130 MHz/cm2 (1m)
= ATLAS × 1000
ATLAS environment : 3m w/ filter(100)
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Rate
Gamma flux (1m)
Total gamma flux (10 years HL-LHC) :
125 kHz/cm2 × 6×106 sec/year ×10 years = 7.5×1012 photons/cm2
300 fb-1/year, L= 5×1034 cm-2s-1
16 hours irradiation corresponds to 10 years
Integrated charge
HL-LHC 10 years : 48 mC/cm2 ( 10 kHz/cm2, G=10000)
260 hours at 1m from the source
Hit rate
work in progress (Geant4 Simulation)
Hit rate = flux × sensitivity
Sensitivity of muon chambers ~ 4×10-3 → Max hit rate in ATLAS ~ 1kHz/cm2
Sensitivity of test chambers for 662 keV gamma > 5×10-4, dE ~ a few keV
a few days – week ?
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Summary
• ESL chamberを使える状態にするのが最優先事項
• テレスコープとしてTmm chamber などを使いたい
• Hit rate のsimulationなどを今後つめていく
• 時間がないのでalpha, X-ray, neutronも計画的に
• 学会まで時間がないので，解析も大変
日本から人はいっぱい来たけど，，，とならないようにがんばります
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Back up
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Background Simulation (Hit rate)
ATLAS NOTE, Expected Muon Spectrometer Background in Run 2
https://cds.cern.ch/record/1707800
Assuming micromegas has same sensitivity as CSC ( 4×10-3 for 1 MeV gamma)
Photon Hit rate
( local max, HL-LHC )
Max photon Hit rate is about 1 kHz/cm2
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Operation time of LHC
Luminosity = 5×1034 cm-2s-1 = 5×10-5 fb-1s-1
(300 fb-1/year) / (5× 10-5 fb-1s-1) = 6×106 sec/year
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Resolution during the full test beam period
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Background Simulation (flux)
Background task force, ATL-GEN-2005-001
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Photon Sensitivity
ATLAS NOTE
Expected Muon Spectrometer
Background in Run 2
https://cds.cern.ch/record/1707800
@ 1MeV
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Test beam strategy
CSC
4×10-3
MDT
8×10-3
RPC
4×10-3
TGC
4×10-3
15
Photon Energy Spectrum @ATLAS
2.3<η <2.7
1.4<η <2.3
η <1.4
03/07/2015
ATLAS muon spectrometer TDR (1997)
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Neutron Sensitivity
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Neutron Energy Spectrum @ATLAS
2.3<η <2.7
1.4<η <2.3
η <1.4
ATLAS muon spectrometer TDR (1997)
test beam region
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Irradiator
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Irradiation area
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