Scintillators testing at Prague Vít Vorobel, Aivaras Zukauskas, Dimitri Mathian Petr Pridal, Fadahat Mamedov Guillaume Lutter, Emmanuel Chauveau Oleg Kochetov (Financed by FMP ChU, IEAP CTU, JINR Dubna) 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Outline Spectrometers - hysteresis, vacuum, calibration Scintillator testing setup, stability X-wall blocks (Envinet) scan 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

“Spectrometers” Dubna #1 Dubna #2 (in BlackBox) Praha Best reached vacuum ~100 Pa in all three spectrometers 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 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 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 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 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Calibration Bi207 used for calibration of Si detector (1 mm thickness) FWHM ~20 keV at 976 keV 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

Spectrometer calibration 260 keV 385 keV 510 keV 640 keV 770 keV 900 keV 1040 keV 1170 keV 1440 keV FWHM ~30 keV at 1 MeV 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 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. yoke 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Assembly procedure Teflon tape 3 layers Mylar 12 mm 2 layers Optical grease BC630 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Stabilization Electron energy from spectrometer set 1 MeV Electrons measured with X-wall block Peak position vs. time displayed Stabilization reached in 15 hours Dubna spectrometer #2 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

X-wall blocks – Envinet (exposition 20 min.) 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux X-wall scintillator # 1 (FWHM at 1 MeV) 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux X-wall scintillator # 2 (FWHM at 1 MeV) 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux X-wall scintillator # 3 (FWHM at 1 MeV) 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 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 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Backup 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Stabilization Prague spectrometer 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Stabilization Dubna spectrometer #2 Dubna spectrometer #2 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux Stabilization Dubna spectrometer #2 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux

V. Vorobel, SuperNEMO meeting, Bordeaux 19.6.2012 V. Vorobel, SuperNEMO meeting, Bordeaux