V. Vorobel, SuperNEMO meeting, Aussois Vacuum system upgrade Vacuum probe installed Spectrometer sealed – vacuum improved from 300 Pa to 7 Pa. We have to change a hoose for further improvement. Efect on spectra is significant

V. Vorobel, SuperNEMO meeting, Aussois Electronics upgrade PC controlled disriminator CAEN installed in VME – simplification of electronics, well defined and stable threshold, no possible interference between crates Independent HV sources for different PMTs – to equilibrate differences in gains. We are waiting for delivery of VME PC controlled HV modules. Cables fixation Waiting for new PC controled HV modules and repaired VME doesn‘t prevent measurement.

V. Vorobel, SuperNEMO meeting, Aussois Magnetic history influence Does the electron beam energy depend on the previously set energy due to the magnetic hysteresis? 1) If we keep the rule – first go up to magnetic saturation then go down to the desired energy 2) If we keep the rule – don‘t keep 1) if the desired energy < the original energy

V. Vorobel, SuperNEMO meeting, Aussois Swapping measurement Does the peak position depend on the measurement position in the Black-Box due to magnetic field variations?

V. Vorobel, SuperNEMO meeting, Aussois Magnetic shielding upgrade - 4  -metal cylinders internal  133mm,length 305mm, thickness 1mm for PMT shielding instead of the low C steel cylinders which were used up to now - plan to make a  -metal box (thickness 1mm) to cover the spectrometer completly

V. Vorobel, SuperNEMO meeting, Aussois Magnetic shielding measurement - Magnetic sensor placed instead of PMT in measurement possition 1. - B-field measured in 3 directions in 3 shielding configurations (no shield, low C steel,  -metal) for currents in the coil corresponding to the electron beam energies keV, saturation.

PMT HV optimization V. Vorobel, SuperNEMO meeting, Aussois

 E detector setting optimization V. Vorobel, SuperNEMO meeting, Aussois

 E detector setting optimization V. Vorobel, SuperNEMO meeting, Aussois

 E detector setting optimization V. Vorobel, SuperNEMO meeting, Aussois

 E detector setting optimization V. Vorobel, SuperNEMO meeting, Aussois - PMT HV 1300 V - DE HV 1200 V - Vacuum 6.4 Pa - E=1000 keV - R=13.6 %

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Observed spectra V. Vorobel, SuperNEMO meeting, Aussois - PMT HV 1300 V   E HV 1200 V   E threshold 15 mV - Vacuum 7 Pa

Conclusions V. Vorobel, SuperNEMO meeting, Aussois

Backup V. Vorobel, SuperNEMO meeting, Aussois

Magnetic shielding measurement V. Vorobel, SuperNEMO meeting, Aussois

Electronics view V. Vorobel, SuperNEMO meeting, Aussois

Testing station setup V. Vorobel, SuperNEMO meeting, Aussois

Routine measurement setup view V. Vorobel, SuperNEMO meeting, Aussois

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block

Oscilloscope snap V. Vorobel, SuperNEMO meeting, Aussois  E left  E right scint. block