Balloon borne experiment of Balloon borne experiment of MeV-Gamma Camera MeV-Gamma Camera with μ-PIC with μ-PIC H.Nishimura H.Nishimura T.Tanimori, H.Kubo, K.Miuchi, K.Tsuchiya, S.Ka T.Tanimori, H.Kubo, K.Miuchi, K.Tsuchiya, S.Ka buki, A.Takeda, Y.Okada, K.Hattori, K.Ueno, S. buki, A.Takeda, Y.Okada, K.Hattori, K.Ueno, S. Kurosawa Kurosawa (KYOTO University) (KYOTO University) MeV gamma-ray Camera with μ-PIC System and Operation of first balloon experiment Summary and Future work 2007 MPGD 研研研 研研 @ Photo: Saga balloon Fes
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Balloon borne experiment of MeV-Gamma Camera with μ-PIC
Balloon borne experiment of MeV-Gamma Camera with μ-PIC. H.Nishimura T.Tanimori, H.Kubo, K.Miuchi, K.Tsuchiya, S.Kabuki, A.Takeda, Y.Okada, K.Hattori, K.Ueno, S.Kurosawa (KYOTO University). Photo: Saga balloon Festi. MeV gamma-ray Camera with μ-PIC System and Operation - PowerPoint PPT Presentation
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Balloon borne experiment of Balloon borne experiment of MeV-Gamma CameraMeV-Gamma Camera
Sensitivity gap Sensitivity gap in MeV gamma-ray regionin MeV gamma-ray region
keV MeV GeV TeV
sensitiv
ity
All Sky survey
NeXT
1mCrab
EGRETAir CherenkovGLAST(2007)
~1 °
Our Goal
-15-15
15X [cm]
15
Y [
cm]
MeV-gamma Compton CameraMeV-gamma Compton CameraClassicalDetect energy of e- and γ
and direction of γ
600 events
restrict a direction of γincident in donut-shaped area
Image become broad,and generate ghost.
ex.COMPTEL
two source image
2.6
m
1.7m
CGRO 衛星 COMPTEL
Liquid scinti.
NaI(Tl) scinti
150 events
Advanced
Able to image with less events
-15-15
15
15
X [cm]
Y [
cm]
⇒Our DetectorDetect energy of e- and γ
and direction of e- andγrestrict a direction of γincident in arc area
Gas Time Projection Chamber (μ-TPC) Recoil electron with 3D track and energy less Multiple Scatter Scintillation Camera Direction and energy of scatter γ-ray.
Our Compton CameraOur Compton Camera
Get Direction and energy of incident gamma-ray event by eventGeometrical angle v.s Kinematics angle
⇒ Reject incorrect Compton event
To detect recoil electron. Gas Time Projection Chamber
Electric Field(E=0.4kV/cm)
Drift Velosity(Ar) =4cm/sec
・ Large Volume.>10×10×10cm・ Strong Structure・ less readout65000pixel⇒512line
Flight for 7 hoursAM 5:26(JST) DAQ on 6:11 Launch 8:56 into Level Flight 12:59 DAQ off 13:45 Slash down 14:32 recover by ship
0 1 2 3 4 5 6 7 8 [hour]
35.0Km32.0Km
launch operation endMax at 16km
level flight
・ telemetry no problem・ detector ・DAQ no problem・ rate of data taking ~ 20H z・ Dead time ~10%
DAQ trigger rate
GSO TRIGGER RATE (No VETO)
赤 CPU青 inner air緑 outer air紫 Power System黒 battery (3B36)
Temperature
0 1 2 3 4 5 6 7 [hour]
10
102
103
Hz
/PM
T
GSO ( sum ) trigger rate
Flight Status
operation of TPC @32km height operation of TPC @32km height
launch
End
Rate of micro discharge
hour
altitude
No critical dischargeand damagefor μ-PIC and GEM.
Increasing μ-discharge caused by large energy deposit event .
Charged Particle ModeCharged Particle Mode
red : Landau function 4.8 keV/cm @ peak
MIP 5.3 keV/cm
dE/dx 分布 ( Single track )Single Track
Multi Trackd E /dx[keV/cm]
Observation of MeV Gamma-rayObservation of MeV Gamma-ray
← Observed γ-ray spectrum
Preliminary
• @height of 32 ~ 35 km, 3.5 hour• with 3str Field of view• Total ~250 photons
Final result is coming soon...
Next StepNext Step(10cm)3 MeV γ-ray Camera @ Sanriku(2006)
(30cm)3 Camera @Japan 6 hours (2009?)•Observation of Crab and Cyg X-1
(40cm)3 Camera Long flight Balloon ~ 10 Days
(50cm)3 Camera all-sky survey on satellite
・ 30×30 cm2 μ-PIC・ 23×28cm2 GEM or 15×28cm2GEM× 2・ Development low power read out system ⇒CMOS-ASIC with KEK
ConclusionConclusionBalloon experiment of MeV gamma-ray Camera with μ-PIC 10X10X14cm 3 Gas TPC + GSO Scintillator measurement of diffuse gamma-ray2006/9/1 launch 、7 hours flight 4 hours level flight at the hight of 32~35km
Detect ~ 250 photons (100keV ~1 MeV)No critical discharge and no damage at detector (μ-PIC)Our μ-TPC TPC was operated without any problem.
Future workFuture workmore detail analys of flight data
Construct larger detector
ガンマ線観測モードガンマ線観測モード
• 高度 32 ~ 35 km, 3.5 時間• 視野 3str 内のイベントのみ• Total ~250 photons
← レベルフライトで観測された ガンマ線スペクトル
Preliminary
Preliminary
天頂角依存性 →• 100 ~ 900 keV• 高度 32 ~ 35km, 3.5h
Atmospheric flux
Total flux(Atmospheric + Cosmic)
0 90 180
Zenith angle [degrees]
0.3 MeV
0.5
0.8
1.0
← 大気の厚みに対する カウントレートの変化
• 視野 (3str) 内• エラーバーは 統計のエラーのみ• 図中の曲線は cosmic 成分 : Fc = a E–b× exp(-z/τtot) a,b: free parameter τtot: mean free path atmospheric 成分 : Fa = c E-d × z c,d: free parameter と仮定して R(z) = ∫(Fc + Fa)εeffdE で fitting して得たもの