Scintillators testing at Prague
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Transcript of Scintillators testing at Prague
V. Vorobel, SuperNEMO meeting, Bordeaux
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Scintillators testing at Prague
Vít Vorobel, Aivaras Zukauskas, Dimitri MathianPetr Pridal, Fadahat Mamedov
Guillaume Lutter, Emmanuel ChauveauOleg Kochetov
(Financed by FMP ChU, IEAP CTU, JINR Dubna)
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Spectrometers - hysteresis, vacuum, calibrationScintillator testing setup, stabilityX-wall blocks (Envinet) scan
Outline
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“Spectrometers”
Dubna #1 Dubna #2 (in BlackBox) Praha
Best reached vacuum ~100 Pa in all three spectrometers19.6.2012
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Setup
NEMO3 PMT 5 inch + cookie inside steel tube (mag shielding)
Wrapped scintillator block
Aluminium frame supporting block with PMT
DeltaE detector - 100mm PVT + 2 PMT
Spectrometer
XY-table
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Setup Black Box 100 x 130 x 130 cm
PMTs NEMO-3 5’.
Delta E - 100 mm PVT Eljen foil, 2 PMTs in coincidence
Signal readout – Digitizer CAEN V1720, 8 channel, alternatively Amplifier + ADC.
Monoenergetic electron source - “Spectrometer” Power Suply TTi, PC controlled. magnet yoke - low hysteresis material. 90Sr, 370MBq
Spectrometer calibration Si detector, 1 mm thickness, 20 mm2. 207Bi, 100 kBq.
XY-table Range 45 x 45 cm. Control with PC serial port
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Calibration Bi207 used for calibration of Si detector (1 mm thickness) FWHM ~20 keV at 976 keV
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Spectrometer calibration
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FWHM ~30 keV at 1 MeV
260 keV
1440 keV
770 keV
385 keV 510 keV
640 keV 900 keV
1040 keV 1170 keV
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Hysteresis
– Set I = -2 A– Increase gradually current and measure Eup(I)– Set I= +2 A– Decrease gradually current and measure Edown(I)
Electron energy measured with 1 mm Si detector
Original yoke
Low hyst. yoke19.6.2012
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Assembly procedure
Teflon tape 3 layers Mylar 12 mm 2 layers Optical grease BC630
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Stabilization
Dubna spectrometer #2
Electron energy from spectrometer set 1 MeV Electrons measured with X-wall block Peak position vs. time displayed
Stabilization reached in 15 hours
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X-wall blocks – Envinet (exposition 20 min.)
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X-wall scintillator # 1 (FWHM at 1 MeV)
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X-wall scintillator # 2 (FWHM at 1 MeV)
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X-wall scintillator # 3 (FWHM at 1 MeV)
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Conclusion
We are ready to characterise the scintillator blocks FWHM of 3 X-wall blocks measured 12.7-14.7 % (spectrometer resolution
not subtracted), measurement will be repeated
Plan 69 X-wall blocks still in Prague 4 of them should be measured in Prague, Bordeaux, UCL for cross-check
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Backup
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StabilizationPrague spectrometer
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Stabilization
Dubna spectrometer #2
Dubna spectrometer #2
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Stabilization
Dubna spectrometer #2
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