Diagnostic_Paris_SReinhardt

Report
Munich-Centre for Advanced Photonics
A pixel detector system for
laser-accelerated ion detection
Sabine Reinhardt
Fakultät für Physik, Ludwig-Maximilians-Universität München, Germany
Munich-Centre for Advanced Photonics
Detection of laser-accelerated proton (ion) beams:
• Ultra-short (<= ns) highly intense (> 107 ions/cm2) ion pulses
• EMP presence
• Mixed radiation background
• Large energy spread of ions
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Pixel detector as online detector in Thomson spectrometer:
• real time measurement
108 particles / cm²
=
1 particle / µm²
• excellent spatial resolution
• good energy resolution
A, N
Φ 
N
 const
A
1/
4A
g 1/4 N
Investigated detector systems:
• Kappa DX-4
• Timepix
(commercial system)
(scientific system)
 collaboration with IAEP CTU Prague
(commercial system)
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Munich 14 MV Tandem accelerator
• Electrostatic accelerator
• protons: 8- 25 MeV
• 3 irradiation modes:
 single particle
 continuous
 pulsed
g similar to laser ion pulse
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Kappa DX-4
• Kodak CCD sensor KAI 1020
• 7.4 mm x 7.4 mm pixel size
• 2 mm depletion depth
• commercial system
• integrating detector
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Summary
+ Dynamic range:
1 - 106 p/cm2/pulse
+ Linear response
+ Radiation hardness
(20 MeV, 107p/cm2):
1000 shots
- Charge sharing effects
- Small sensitive area
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Timepix (in collaboration with IAEP CTU Prague)
• Medipix collaboration (CERN)
• hybrid detector system
• 300 mm Si-sensor
Single event
• 256 x 256 pixel (50 x 50 mm2)
• 3 different read-out modes:
• Medipix mode (counting)
Double event
• Timepix mode (time)
• TOT mode (energy)
cluster = adjacent pixel above threshold
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Summary
+ Single particle response
+ Linear response
+ Good energy resolution
65 keV @ 5239 keV
- Large charge sharing effects
- Small sensitive area
-- Saturation and non-linear effects
2.5 . 105 p/cm2 /pulse
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Rad Eye detector system
• RadEye 1 sensor
• Si-photodiode array
• 48 mm x 48 mm pixel size
• 2 mm depletion depth
• large sensitive area:
25 mm x 50 mm
• commercial system
• integrating detector
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Single proton sensitivity
Cluster pixel distribution:
Munich 14 MV Tandem accelerator
• continuous beam
• 15 MeV protons
• ~ 104p/cm2/s
Cluster distribution:
single hit
double hit
No charge sharing effects observed
Single and double hits can be distinguished
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Munich 14 MV Tandem accelerator
• pulsed beam
• 20 MeV protons
• 104 - 107 p/cm2/ns
a
c
b
d
Good agreement to continuous
measurements
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Radiation hardness
Munich 14 MV Tandem accelerator
• continuous + pulsed beam
• 20 MeV protons
• <= 6 .1010 p/cm2
Lifetime n 90% residual dynamic range
3000 shots
(20 MeV, 107p/cm2)
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
MPQ Atlas laser
• 2.5 J, 30 fs,
• focal spot 3 mm (FWHM)
• 5-10 nm DLC foils
• wide angle spectrometer
g dipole set
2 x 0.5 T
g entrance slit 0.3 x 140 mm2
• Eproton > 1 MeV
laser
DLC foil
07.-08.06.2012
dipole set
Entrance slit
Al- foil
RadEyeSystem
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Pixel value spectrum:
Peak position n Energy loss
Peak content n
07.-08.06.2012
Average number of
proton hits per pixel
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Sensor “C”
07.-08.06.2012
Sensor “D”
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
SRIM 2008:
Energy loss simulation
Test with with a-source:
g good agreement
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
MPQ Atlas laser
• 400 mJ, 30 fs
• 20-40 nm DLC foils
• small angle spectrometer
g only dipole 0.5 T
g pinhole
2.5 mm
• Eproton > 4 MeV
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Compact integrated system “RE4PC”
 Stand alone system
 computer control and read-out electronics
 Compact size: 30 x 25 x 25 cm3
 Parallel read-out of 4 RadEye detectors
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Astra Gemini laser
• 4-6 J, 50 fs
• focal spot: 3 mm (FWHM)
• target: 75 nm plastic foil
• p > 3.7 MeV
• C > 20 MeV
p
6+C
??
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Conclusion
RadEye-Detector
 Single proton sensitivity
 Limited energy resolution
 Sufficient radiation hardness
 Linear pulse dose response up to 107 p/cm2
 No problems with EMP in laser-environment
RE4PC
 Compact pixel detector system based on RadEye sensor developed
 Sensitive area as large as 100 x 50 mm2
 Extension of functionality planned (trigger, read-out speed, ...)
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France
Munich-Centre for Advanced Photonics
Many thanks to
Wolfgang Draxinger, and Walter Assmann
Klaus Allinger, Jianhui Bin, Wenjun Ma and Jörg Schreiber
Carlos Granja and Frantisek Krejci
07.-08.06.2012
Instrumentation for Diagnostics and Control of Laser-Accelerated Proton (Ion) Beams: 2nd Workshop, Paris, France

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