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Properties of scCVD diamonds irradiated with a high intensity Au beam

Properties of scCVD diamonds irradiated with a high intensity Au beam. T0 detector and beam monitoring reqirements for Au+Au experiment in HADES Au beam properties at SIS 18 Radiation hardness tests of scCVD diamond detector scCVD diamond detector with strip metalization in Apr 2012

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Properties of scCVD diamonds irradiated with a high intensity Au beam

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  1. Properties of scCVD diamonds irradiated with a high intensity Au beam • T0 detector and beam monitoring reqirements for Au+Au experiment in HADES • Au beam properties at SIS 18 • Radiation hardness tests of scCVD diamond detector • scCVD diamond detector with strip metalization in Apr 2012 • Outlook: • CBM/HADES at SIS100 and CBM @ SIS300 • fast readout electronics Jerzy Pietraszkoa , W. Koeniga, Trägera for the HADES Collaboration aGSI Helmholtz Centre for Heavy Ion Research GmbH Planckstrasse 1, D-64291 Darmstadt, Germany

  2. The HADES detector at GSI Au+Au pp@3.5 GeV we+e− sM(w)  2.0% http://www-hades.gsi.de • azimuth. symmetry • large coverage: y = 0 - 2 • hadron & lepton PID • 2% mass resolution • LVL2 lepton trigger • forward wall ToF measurement essential part of particle identification (T0 determination) diamond detector 2 ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  3. 6 1 2 5 7 4 3 4.7mm 8 Start - Halo 4,7 mm HADES Start-Veto system (Au+Au) 15 gold targets (Ø 2.2 mm) Detector requirements: Low material budget (low interaction probability), good time resolution (below 50 ps) In vacuum operation, located directly in front of the target in order to reduce load on the RICH  Start det.: monocrystalline diamond, 70 m thickness, 4.7mm x 4.7mm Veto det.: polycrystalline diamond, 100 m thickness, behind the RICH Detector. Start detector ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  4. 6 1 2 5 7 4 3 4.7mm 8 15 gold targets (Ø 2.2 mm) Veto detector, pcCVD reference detector Start detector scCVD 4,7 mm 10 mm Veto detector Start detector 45 cm HADES Start-Veto system (Au+Au)  Start det.: monocrystalline diamond, 70 m thickness, 4.7mm x 4.7mm Veto det.: polycrystalline diamond, 100 m thickness, behind the RICH Detector. ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  5. Signal characteristics for Au ions @ 1.23 AGeV pcCVD E. Berdermann et al., „First applications of CVD diamonds ...”, Como 1998 • Reduction of the effective field due to the large space charge produced by heavy ions • Optimal working point for Au beam: 6-7 V/µm ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  6. Start-Veto system readout electronics 8 x LVDS timing output signals NINO chip: Developed for Time-of-flight measurements in the ALICE experiment Key features:  Adjustable discriminator thresholds.  Front end time jitter <10ps.  Sustains very high rate (>>10MHz)  Peaking time: 1ns.  Input signal range: 30fC - 2pC.  Noise: <2500 e-.  Discriminator threshold: 10fC - 100fC.  Timing precision: <10ps jitter.  Output: LVDS. Issues: High rate, up to 107/s per channel. Fast signals, analog signal from diamond – 200 ps rise time, base width < 1ns. Our approach: Dedicated NINO based discriminator board with trigger functionality. Time measurement performed by HADES TRB board – based on HPTDC. NINO-based board 8 x input signals 8 x scaler/trigger output signals ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  7. scCVD with high intensity Au beam stability problem ! Long term stability problem – increasing off-spill current • Effect clearly visible after 2-3 hours of continuous Au beam with intensity 106/s (/ mm2) • Observed for scCVD and pcCVD diamond materials Setup and conditions: Start det.: monocrystalline diamond, 70 m thickness, HV set to 200 V. Veto det.: polycrystalline diamond, 100 m thickness, HV set to 200 V. Beam particles intensity: 106/s per channel  Strong dependence on the HV observed: example: 200 V – 0.25 A 150 V – 0.08 A could not stand 4-5 weeks of Au+Au production run in HADES !!!!  Stable long term operation at 1.4 V/µm ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  8. St ch2 35 ps St ch3 38 ps St ch1 41 ps St ch4 35 ps St ch5 St ch6 St ch8 HPTDC resolution St ch7 Start-Veto system – test with Au beam, time resolution at 1V/ m (HV = 50 V) HV reduced by a factor of 4 (200 V  50 V) - the time resolution below 50 ps  expected stable long term operation during high intensity HI run ! ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  9. M. Träger, GSI Det.Lab 0.8 mm Five days with Au beam (Au 2011) Dismounted Start detector: Electron microscope Beam spot 0.8x1.6 mm2 1.28 mm2 X-ray Microanalysis (EDX) No damage to the Au metalization surface visible GSI Target.Lab ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  10. Beam profile in X and Y directions Au beam properties at SIS 18measuerd with a strip detectror 3σy = 1.26 mm 3σx = 0.97 mm ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  11. 6 1 2 5 7 4 3 8 4.7mm + 30 % DAQ off + 30 % beam times in 2010  3.04 x 1011 Au ions / 1.0 mm2 3.04 x 1011 Au ions / mm2 1.9 x 10 11 Au ions Five days with Au beam ADC spectra: Pu239 - Am241 - Cm244 in vacuum (5.157 MeV, 5.486 MeV, 5.804 MeV) Total dose during 5 days measured in the Start detector outer segments inner segments M. Träger, GSI Det.Lab ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  12. 3.04x 1011Au ions / mm2 0.70 x 1011 Au ions / mm2 Start detector efficiency determination Strong eff. changes correlated with shifts in beam position !! ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  13. Threshold characteristics (Aug11): cut amplitudes lower than 35mV Radiation hardness study with Au beam - amplitude reduction • After 3.04 x 1011 Au ions /mm2about 5% of signals below 35 mV • Total absorbed dose : 7.9 Grad (312 MeV / Au ion) • Amplitude reduction by a factor of 2.7 • Precise CCE measurment needed Analog signals, Au beam, HV: 100V Amplitude; 94 mV ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  14. Start detector time resolution ( after 3.04 x 1011 Au ions / mm2, 7.9 Grad)  difficult conclusions: the right picture measured for signals very close to the discriminator threshold level (large time jitter)  worsening comes from electronics ! ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  15. Highly segmented diamond sensor – excellent beam diagnostic capabilities – used in Apr 2012(5 weeks Au beam) - 16 stripes on each side • strip width: 200µm • gap: 90 µm • thickness about 60 µm 4.39 mm Beam profile in X and Y directions ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  16. Outlook: Fast readout electronics T0 detector and beam quality monitor for FAIR (HADES/CBM)  high rate experiments (109 HI beam particles) : decent segmentation + fast readout electronics (TRB3) TRB 2 Board: 4 TDC – 128 channels (HPTDC), 4x512Mb SDRAM, FPGA – Virtex4LX40, ETRAX, FS – 4 processors, 100Mb/s,TCP/IP, 2,5 Gb/s optical link, DSP TigerSharc, DC/DC converters, AddOn connector  Time, ToT, 96ps/bin - 128 channels  Time, ToT, 25ps/bin - 32 channels  Rate capability: up to 3 MHz per channel All channels show RMS below 25ps/1.4 = 17.8 ps New development available: Eugen Bayer, Michael Traxler Real Time Conference (RT), 2010 17th IEEE-NPSS ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  17. High rate, high charge resolution measurement (Diamond, ECal, MDC, ....) Outlook: Fast readout electronics dE/dx Large jitter of the integrator width (charge) due to high gain for low frequency noise After walk correction via leading edges:  Charge Resolution:0.17 % ADAMAS 1st Workshop, GSI, Darmstadt, 16-18 December 2012

  18. Thank you We highly appreciate the support of E. Berdermann et al. from the GSI Detector Laboratory and A. Hübner at al. from the GSI Target Laboratory for the detector preparation.

  19. Start-Veto system forHADES pion/proton experiment (MIPs) Experimental conditions and requirements for HADES pion experiment: Secondary pion beam, mom.=1GeV/c (MIPs)  scCVD Demanding beam particles intensity >106 pions/sec Secondary beam. Beam spot diameter 1-2 cm  Large area moncrystaline diamond Timing signal for Tof measurement and for trigger - 50 ps time resolution Prototype: 4.7 mm x 4.7 mm, monocrystalline: used for proton induced reactions NIMA 618 (2010) 121-123

  20. TDiff TDiff ToT ToT Start-detector for MIPs – test with p beam after ToT cut Juelich proton beam, 2.95 GeV:  Two Start det.: monocrystalline diamond, 500 m thickness, 4.7mm x 4.7mm, with halo functionality, 50nm Cr/150nm Au metallization.  Stable operation at intensities > 10^6 protons/ s/channel, BEST TIME RES = 100 ps, expected 50ps

  21. ~1.5 m of cable The Multipurpose Trigger Readout Board TRB Pulser test signal sent to 8 channels.  Individual INL corrections for each channel  All 32 channels show RMS below 25ps/1.4 = 17.8 ps TRB Board: 4 TDC – 128 channels (HPTDC), 4x512Mb SDRAM, FPGA – Virtex4LX40, ETRAX, FS – 4 processors, 100Mb/s,TCP/IP, 2,5 Gb/s optical link, DSP TigerSharc, DC/DC converters, AddOn connector  Time, ToT, 96ps/bin - 128 channels  Time, ToT, 25ps/bin - 32 channels  Rate capability: up to 3 MHz per channel

  22. 6 1 2 5 7 4 3 8 4.7mm Beam position monitoring Precise position information

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