Vacuum system upgrade
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15.1.204 1 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
description
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. Electronics upgrade. - PowerPoint PPT Presentation
Transcript of Vacuum system upgrade
115.1.204 V. Vorobel, SuperNEMO meeting, Aussois
Vacuum system upgradeVacuum probe installedSpectrometer sealed – vacuum improved from 300 Pa to 7 Pa.We have to change a hoose for further improvement.
Efect on spectra is significant
215.1.204 V. Vorobel, SuperNEMO meeting, Aussois
Electronics upgradePC 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.
315.1.204 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 energy2) If we keep the rule – don‘t keep 1) if the desired energy < the original energy
415.1.204 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?
515.1.204 V. Vorobel, SuperNEMO meeting, Aussois
Magnetic shielding upgrade- 4 m-metal cylinders internal f133mm,length 305mm, thickness 1mm for PMT shielding
instead of the low C steel cylinders which were used up to now- plan to make a m-metal box (thickness 1mm) to cover the spectrometer completly
615.1.204 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, m-metal)
for currents in the coil corresponding to the electron beam energies 0-1600keV, saturation.
0 500 1000 1500 2000 2500 3000 3500-50
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Series1Series3Series5
0 500 1000 1500 2000 2500 3000 3500
-60-50-40-30-20-10
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Series1Series3Series5
0 500 1000 1500 2000 2500 3000 3500
-20-15-10-505
Series1Series3Series5
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PMT HV optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
- PMT HV 1300 V- DE HV 1200 V- Vacuum 6.4 Pa- E=1000 keV- R=13.6 %
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Oscilloscope snap
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Observed spectra
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
- PMT HV 1300 V- DE HV 1200 V- DE threshold 15 mV- Vacuum 7 Pa
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Conclusions
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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Backup
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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Magnetic shielding measurement
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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Electronics view
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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Testing station setup
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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Routine measurement setup view
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
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Oscilloscope snap 1
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 2
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 3
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 4
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 5
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 6
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 7
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 8
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 9
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 10
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 11
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
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Oscilloscope snap 12
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
