Vacuum system upgrade

1. V. Vorobel, SuperNEMO meeting, Aussois Vacuumsystem upgrade • Vacuumprobeinstalled • Spectrometersealed – vacuumimprovedfrom 300 Pa to 7 Pa. • Wehave to change a hooseforfurtherimprovement. • Efect on spectraissignificant

2. Electronics upgrade V. Vorobel, SuperNEMO meeting, Aussois • PC controlleddisriminator CAEN installedin VME – simplificationofelectronics, welldefinedand stablethreshold, no possible interference betweencrates • Independent HV sourcesfordifferentPMTs – to equilibratedifferences in gains. We are waitingfordeliveryof VME PC controlled HV modules. • Cablesfixation • Waitingfornew PC controled HV modules and repaired VME doesn‘tpreventmeasurement.

3. V. Vorobel, SuperNEMO meeting, Aussois Magnetichistory influence • Doestheelectronbeamenergydepend on thepreviously set energydue to themagnetichysteresis? • 1) Ifwekeepthe rule – first go up to magneticsaturationthen go down to thedesiredenergy • 2) Ifwekeepthe rule – don‘tkeep 1) ifthedesiredenergy < theoriginalenergy

4. V. Vorobel, SuperNEMO meeting, Aussois Swappingmeasurement • Doesthepeakpositiondepend on themeasurementposition in the Black-Box due to magneticfieldvariations?

5. V. Vorobel, SuperNEMO meeting, Aussois Magneticshielding upgrade • 4 m-metal cylindersinternalf133mm,length 305mm, thickness 1mm for PMT shieldinginsteadofthelow C steelcylinderswhichwereused up to now • plan to make a m-metal box (thickness 1mm) to coverthespectrometercompletly

6. V. Vorobel, SuperNEMO meeting, Aussois Magneticshieldingmeasurement • Magnetic sensor placedinsteadof PMT in measurementpossition 1. • B-fieldmeasured in 3 directions in 3 shieldingconfigurations (no shield, low C steel, m-metal) forcurrents in thecoilcorresponding to theelectronbeamenergies 0-1600keV, saturation.

7. V. Vorobel, SuperNEMO meeting, Aussois PMT HV optimization

8. V. Vorobel, SuperNEMO meeting, Aussois DE detectorsettingoptimization

9. V. Vorobel, SuperNEMO meeting, Aussois DE detectorsettingoptimization

10. V. Vorobel, SuperNEMO meeting, Aussois DE detectorsettingoptimization

11. V. Vorobel, SuperNEMO meeting, Aussois DE detectorsettingoptimization • PMT HV 1300 V • DE HV 1200 V • Vacuum 6.4 Pa • E=1000 keV • R=13.6 %

12. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap DE left scint. block DE right

13. V. Vorobel, SuperNEMO meeting, Aussois Observedspectra • PMT HV 1300 V • DE HV 1200 V • DE threshold 15 mV • Vacuum7 Pa

14. V. Vorobel, SuperNEMO meeting, Aussois Conclusions

15. V. Vorobel, SuperNEMO meeting, Aussois Backup

16. V. Vorobel, SuperNEMO meeting, Aussois Magneticshieldingmeasurement

17. V. Vorobel, SuperNEMO meeting, Aussois Electronicsview

18. V. Vorobel, SuperNEMO meeting, Aussois Testing station setup

19. V. Vorobel, SuperNEMO meeting, Aussois Routinemeasurementsetupview

20. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 1 DE left scint. block DE right

21. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 2 DE left scint. block DE right

22. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 3 DE left scint. block DE right

23. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 4 DE left scint. block DE right

24. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 5 DE left scint. block DE right

25. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 6 DE left scint. block DE right

26. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 7 DE left scint. block DE right

27. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 8 DE left scint. block DE right

28. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 9 DE left scint. block DE right

29. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 10 DE left scint. block DE right

30. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 11 DE left scint. block DE right

31. V. Vorobel, SuperNEMO meeting, Aussois Oscilloscopesnap 12 DE left scint. block DE right