Vacuum system upgrade
description
Transcript of Vacuum system upgrade
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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
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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.
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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
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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?
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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
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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
0
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