1 / 19

FCAL R&D in Minsk Group: Sensors and Electronics

FCAL R&D in Minsk Group: Sensors and Electronics. Presented by Igor Emeliantchik. FCAL Collaboration Meeting @ MPI Munich October 1 7 , 2006, Munich , Germany. Current Spectrometric Setup. NIM + CAMAC LeCroy 2249W ADC “Tetrode” preamp. 90 Sr. Paraffin collimator. Diamond.

elizalde
Download Presentation

FCAL R&D in Minsk Group: Sensors and Electronics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. FCAL R&D in Minsk Group:Sensors and Electronics Presented by Igor Emeliantchik FCAL Collaboration Meeting@ MPI MunichOctober 17, 2006, Munich, Germany

  2. Current Spectrometric Setup • NIM + CAMAC • LeCroy 2249W ADC • “Tetrode” preamp 90Sr Paraffin collimator Diamond Scintillator Noise: with Minsk diamond – 580e- with Freiburg diamond – 750e- PMT

  3. Monocrystalline Diamond Detector Contact device is made for measurement of non-packaged diamond detectors

  4. CCD Measurement Difficulties Background Signal • Background is much bigger than signal • Two possible reasons: • Low efficiency of trigger system due to small area of the diamond. • Non-uniformity of the diamond – “dead” areas give no signal.

  5. Response dependence on the dose absorbed,measured with oscilloscope Averaged amplitude of response to the whole -spectrum of 90Sr was measured with digital oscilloscope at each dose point. Detector behavior seems to demonstrate classical pumping effect, no polarisation.

  6. Test of trigger efficiency: measurement of natural diamond of the same area Background Signal Trigger efficiency seems to be not the cause of large background in the case of syntethic monocrystalline diamond

  7. CCD versus dosemeasured in standard way The trendline confirms the previous measurement made with oscilloscope. No polarization, just pumping

  8. Next Steps New samples, not yet measured 1. Experimenting with parameters of thermobaric procedure. Dependence of N-N and Me-N centers formation on the temperature and duration of annealing, measurement with optical methods 2. Comparison of Fe-Ni and Fe-Co grown diamonds and choosing the best. Nikel and cobalt have different solubilities in diamond and form different types of defects. 3. Detailed measurement of stability and dose dependent behavior.

  9. Freiburg CVD DiamondsMeasurement of Charge Collection Distance Desy7, before irradiation Desy7, irradiated with 1 Gy Fitting with 2 gausses, left one represents the background, right one – the signal

  10. CDD Dependence on the Time and Dose, sample Desy7 Strong polarisation effects can explain this behavior

  11. CDD Dependence on the Time and Dose, sample FAP7.3 Polarization effects are expressed even stronger

  12. DESY7 with Replaced MetallizationTi-Ag with proper annealing for titanium carbidization Dose related behavior hadn’t changed, but the value of CCD before irradiation increased twofold (CCD = 32m with old metallization, CCD = 65m with new metallization).

  13. Electronics for a segment of BeamCal detector prototype based on GaAs sensors GaAs detectors provide: • Strong signal • High radiation hardness: GaAs/Si  10 • Small leakage currents (no refrigeration) Sensor segment layout Sensor specifications The sensor, output connectors and a power supply connector are mounted on a common PCB

  14. AS01PDA ASIC meet the detector requirements AS01PDA main parameters

  15. AS01PDA block diagram

  16. AS01PDA on the small PCB and eight channels flat bar PCB Main unit of the FEE prototype One flat bar of the FEE prototype The GaAs prototype electronics will consist of eleven PCB flat bars (87 channels)

  17. FEE prototype measurement results Gain and waveform versus detector capacitance in response to 10fC input charge Linearity at different power supply voltages Linearity measurements done by Krzysztof Oliwa and Wojciech Wierba The IC was earlier tested with Tomsk GaAs detectors (1cm x 1cm) and shown good results

  18. Schedule of assembling of GaAs calorimeter segment prototype • End of October - 87 channels of the FEE will be done • November – GaAs sensors will be done

  19. Conclusions 1. First measurements of Minsk monocrystalline diamond detector are performed. 2. New metallization for CVD diamonds is tested; the first sample with new metallization works better than with old one. 3. First channel of redout electronics for GaAs calorimeter segment prototype is assembled and tested; the work is going on within the schedule.

More Related