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Comparisons of Scintillating Fiber, Diamond Particle Detector and Beam Current Transformer

Explore the comparison of scintillating fiber, diamond particle detector, and beam current transformer signals in a detailed study conducted by T. Tsang at BNL in 2009. Analyzing peak heights and responses for pump-probe studies.

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Comparisons of Scintillating Fiber, Diamond Particle Detector and Beam Current Transformer

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  1. Comparisons of Scintillating Fiber, Diamond Particle Detector and Beam Current Transformer T. Tsang BNL (Nov 24, 2009)

  2. Scintillating fiber channel #0 Feb. 6, 2008 scintillating fiber һγ 2 meter long, BCF-20, 1-mm diameter blue emitting scintillating fiber 12 meter long, 1-mm diameter BFH37-1000 fiber, blue T=0.77 Avalanche photodiode plastic scintillating fiber Saint-Gobain BCF-20 1/e length >3.5 meter fluorescence decay time ~ 2.5 ns ~8000 photons/Mev typical signal trace shot # 17020 8 bunches 6 TP

  3. Diamond particle detector from Marcus Palm typical diamond detector signal trace Shot # 17017 Shot # 17006

  4. Correlation of Scintillator & Diamond Particle detector signal Nov 4 2009 calculated correlation of peak height (data smoothed with 3 or 5 pts) Nov. 11, 2007, 17000 series data Red: x, diamond particle detector signal @ left 20o Black: y, scintillator detector signal P&S 0.94 0.90 0.87 0.47 0.93 0.56 0.83 0.97 0.95 0.89 0.95 0.92 nanosecond

  5. typical transformer signal trace Beam current transformer summary.xls appear to be a file for adjusting the baseline shift transformer.zip – higher resolution data RawTransformerData.tgz – lower resolution data

  6. Correlation of Scintillator & Diamond Detector & Current TransformerSignals Nov 13 2009 Nov. 11, 2007, 17000 series data Red: x, diamond particle detector signal @ left 20o Black: y, scintillator detector signal Blue: z, current transformer signal calculated correlation of peak height (data smoothed with 3 or 5 pts) P&S P&T 0.93 0.94 0.88 0.90 0.74 0.87 0.24 0.47 0.78 0.93 0.53 0.56 0.81 0.83 0.92 0.97 0.95 0.95 0.89 0.89 0.93 0.95 0.88 0.92 nanosecond

  7. Correlation of Scintillator & diamond Particle & current Transformersignal pump-probe studies Nov 18 2009 calculated correlation of peak height (data smoothed with 3 or 5 pts) Nov. 11, 2007, 17000 series data Red: x, diamond particle detector signal @ left 20o Black: y, scintillator detector signal Blue: z, current transformer signal P&S P&T Pump Probe 0.39 0.87 0.92 0.063 0.95 0.88 0.92 nanosecond

  8. Details of diamond particle detector Nov. 6, 2009 Marcus Palm’s diagram 0.5x7.5x7.5 mm3 Au padding 0.5 µm thick Actual diagram guard ring back pCVD 1 kΩ 100 nF electrode front - 0 Ω -500 V 50 Ω term. on oscilloscope 0 Ω 1 MΩ + GND From MPalm_AB_note.pdf

  9. Nov. 6, 2009 Response of diamond particle detector using 193 nm ArF laser laser illumination location Response of diamond particle detector using α injection 241Am @ 5.5 MeV 241Am place in the front – hole draft induced 241Am place in the back - electron drift induced 0.5 mm thick pCVD Electron saturation velocity: 2.3 x 105 m/s → 2.2 ns pulse response Hole saturation velocity: 1 x 105 m/s → 5.0 ns pulse response contradicting our result here !

  10. Nov. 19, 2009 Response of diamond particle detector using x-ray injection @ NSLS-X15A (19 keV) NSLS parameters Bunch frequency: 52.88 MHz Bunch spacing: ~19 ns Bunch length: 287 ps x-ray beam size: 0.2x0.2 mm2 Measured results Transmittance of Au pad: 0.92 Absorption of diamond: 0.0672 Typical photocurrent (ave): ~nA Diamond responsitivity: 0.00464 A/W x-ray injected on the back detector response map response is fairly uniform To be examined on other (more intense) x-ray beamlines the drooping effect of diamond detector, if any diamond detector response No drooping ? x-ray injection drooping ?

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