Post on 22-Feb-2016
description
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
0
50
100
Series1Series3Series5
0 500 1000 1500 2000 2500 3000 3500
-60-50-40-30-20-10
0
Series1Series3Series5
0 500 1000 1500 2000 2500 3000 3500
-20-15-10-505
Series1Series3Series5
7
PMT HV optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
8
DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
9
DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
10
DE detector setting optimization
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
11
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 %
12
Oscilloscope snap
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
13
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
14
Conclusions
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
15
Backup
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
16
Magnetic shielding measurement
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
17
Electronics view
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
18
Testing station setup
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
19
Routine measurement setup view
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
20
Oscilloscope snap 1
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
21
Oscilloscope snap 2
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
22
Oscilloscope snap 3
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
23
Oscilloscope snap 4
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
24
Oscilloscope snap 5
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
25
Oscilloscope snap 6
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
26
Oscilloscope snap 7
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
27
Oscilloscope snap 8
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
28
Oscilloscope snap 9
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
29
Oscilloscope snap 10
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
30
Oscilloscope snap 11
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block
31
Oscilloscope snap 12
15.1.204 V. Vorobel, SuperNEMO meeting, Aussois
DE left
DE right
scint. block