Results from Diamond Detector tests at ELETTRA
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1 Results from Diamond Detector tests at ELETTRA Wolfgang Freund, WP74 European XFEL User s Meeting 2013 Satellite Workshop on Photon Beam Diagnostics, 24 Jan 2013
2 Acknowledgements 2 This beamtime would not have been possible without the support of: Klaus Giewekemeyer & Sadia Bari for taking care of the measurements at the first beamline (SYRMEP) Ralf Menk & Mattias Antonelli access to 2nd beamline & on-site support Michal Pomorski at CEA, Saclay for fabrication of the diamond coatings
3 Content 3 Diamond Detector for the European XFEL Mechanical Setup Experiment at ELETTRA People Setup Results Further Steps
4 Diamond Detector for the European XFEL 4 Requirements for European XFEL: High pulse energy Robust High repetition rate (4.5MHz) Speed Beam stability < 10% rms Intensity: 0.1% relative accuracy Continually in beam path Minimal interference with beam Why Diamond Detector? High charge carrier mobility fast rise time (~ 4000 cm 2 /Vs) Radiation Hard High transmission (hard x-rays) semi-online
5 Diamond Detector for the European XFEL 5 Setup Collaborating partners: Detector fabrication: CEA Saclay (M. Pomorski) Electronics: Cividec (E. Griesmayer) photon electronic grade sccvd diamond Images courtesy M. Pomorski Ref: M.Pomorski et al., Phys. Status Solidi A 206, No. 9, (2009) / DOI /pssa
6 Mechanical Setup 6 Single crystal CVD Diamond DLC layer with Al electrodes Thickness: 300µm Active area: 3.6mm x3.6mm UHV compatible design fits through a 38mm ID tube X1 Diamond Bias and readout Y1 Y2 X2 Ceramic baseplate
7 Experiment at ELETTRA People involved with the Diamond Detector: Cigdem Ozkan (WP74) Wolfgang Freund (WP74) Ralf Menk (ELETTRA) Mattias Antonelli (ELETTRA) ELETTRA machine parameters: 2GeV 470 bunches, 60 bunches dark gap, 2ns separation Microfluorescence beamline Bending magnet Pseudo channel-cut Si crystal or pink beam (Be window) Slits for beam profiling Photon beam parameters 3-14keV 100µm x 200µm with monochromatic beam (6keV) 100µm x 100µm with pink beam Diamond Detector Translation stages 7 slits
8 Measurements 8 ADC or scope ADC PC PC ADC or scope HV Detector Intensity Response Mapping x/y-position scans with 50µm stepwidth HV Spatial Resolution Mapping x/y-position scans with 50µm/100µm stepwidth Preamplifier Testing Cividec C6 Charge Amplifier (100MHz) Cividec C2 High Bandwidth (2GHz) Current Preamplifier (FEMTO DHPCA 100) Analysis is on-going!
9 Detector response mapping 9 Current taken from rear electrode, bias on front side = +300V Scan with monochromatic beam at 6keV Scan with pink beam
10 Detector response mapping 10 Not a surface effect. Crystal defect? Overlay of response map on detector photo
11 Spatial resolution (rear side electrodes) 11 Top edge electrode Bottom edge electrode Bias: front side at + 300V Readout: back side Difference
12 Spatial resolution (front side electrodes) 12 Left electrode Right electrode Bias: back side at - 300V Readout: front side Difference Difference/sum
13 Detector output (no preamplifiers) 13 Dark gap 10 ns Detector is fast enough for XFEL (~4.5MHz) High intensity? (charge cloud effects ) 2ns separation Time constant calculated from geometry: C = 7.5 pf DLC layer: ~ 2kΩ τ = ~ 15ns
14 Further Steps 14 Topogram of diamond for identification of defects New contact design New detector with 50µm diamond (sccvd and second housing available) Tests at high intensity sources / XFEL Implementation of diamond detector DAQ with WP76 Thank you for your attention! Posters: 129, 170, 248
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