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SEM monitors tests PSI February MeV protons

Published byPeregrine Golden Modified over 6 years ago

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Presentation on theme: "SEM monitors tests PSI February MeV protons"— Presentation transcript:

1 SEM monitors tests PSI 17..19 February 2006 62 MeV protons
Previously irradiated standard SEM PSI New SEM with grounded plates around ceramics C II F type SEM with no ceramics between HV and SIGNAL F type

2 F type BLM_S

3 F type BLM_S

4 Ceram II (CII)

5 BLM_S Geant4 Simulation Secondary Emission Yield 0. 057 e-/primary @ 1
BLM_S Geant4 Simulation Secondary Emission Yield GeV

6 SEM Foil Geant4 Simulation Secondary Emission Yield 0
SEM Foil Geant4 Simulation Secondary Emission Yield GeV From Calibration: 0.036! 450 GeV

7 HV scan F Type Transverse with 1cm collimator 7e8p+/s/cm2

8 BLM_S Linearity from May 06 in PSB (1 point per bunch)

9 Simultaneous measurement with SEM and ACEM (SEM directly in the beam)

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13 Transient effect when changing HV in transverse position – effect on the CERAMICS?

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17 19 FEB 2006 F SEM COLLIMATOR position scan

18 19 FEB 2006 F SEM HV scan with Cu collimator

19 Ceram II Beam on Connectors shielding removed

20 F Type Beam on connectors
HV Beam I Beam II F Type Beam on connectors 80pA/cm2 16pA/cm2

21 Attempt to calculate SEY from Bethe Bloch

22 CERAM III with 2 shielding plates Beam on connectors HV SCAN
No clear dependence observed Rem: notice the current density Little better than slide #20

23 CERAM III TRANSVERSE HV SCAN WHY lower for NEGATIVE HV
CERAM III TRANSVERSE HV SCAN WHY lower for NEGATIVE HV?? Centering of beam..? Rather flat down to 10V Transverse -> Aproxim. SEY ! Variations in normalized SEY due to mistakes in PSI beam files

24 F type III TRANSVERSE HV SCAN

25 CERAM III LONGITUDINAL HV SCAN
Strong signal +- 2V ! Voltage not known well below 10V Theory 1.5MeV p+ -> 30%SEY from slide #21…

26 F type III LONGITUDINAL HV SCAN why lower than ceram III?
Strong signal +- 2V ! Theory 1.5MeV p+ -> 30%SEY from slide #21…

27 Ceram III TRANSVERSE POSITION SCAN
GEANT4 simulation to be done including the signal & HV rods – visible on X scan

28 BLMI LONGITUDINAL HV SCAN
Notice the err low negative HV

29 BLMI LONGITUDINAL HV SCAN zoom in time evolutions @ low neg HV
Is this the effect of ions with continuous beam??

30 BLMI LONGITUDINAL Remanent radiation zoom after beam end
Almost linear in LogLog plot => Exponential decay

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