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Recent Cavity Monitor Tests. Credit: John Musson, Anna Boehle, Vince Sulkosky. Good position & current for 10 nA to 100 uA At 10 nA : Need absolute position to 0.2 mm Need resolution of ~ 0.5 mm (1-shot at 200 nsec)

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Recent Cavity Monitor Tests

Credit: John Musson, Anna Boehle, Vince Sulkosky

  • Good position & current for 10 nA to 100 uA

  • At 10 nA :

  • Need absolute position to 0.2 mm

  • Need resolution of ~ 0.5 mm (1-shot at 200 nsec)

  • HRS rates ~ 200 kHz  good for Q

2

Goals ~achieved, but need to repeat with a current & position scan withconstant gain.



High current tests (Jan 2008)

Cavity BPMs

correlated to

Striplines

Good

Good

Saturated gain (oops)

Spectrometer DAQ


Beam Current correlated to Standard BCMs


Low - Current ( 50 nA ) Tests

Cavity X,Y,Q

Steering Coils

Target

8.8 kHz

Bigbite

deflected

beam

uA

Stripline X,Y



100 nA : Striplines disappear,Cavity positions ~ same


50 nA: Calibration Changed !

(oops ! Gain adjusted)


At 9.5 uA

(oops ! Gain adjusted)


Resolution Analysis

Method 1:

Use 1 BPM as a measure of beam motion on the other.

Subtract it off, residual is the resolution (approx).


50 nA

Resolution

~ 400 um

1-shot at 200 nsec.

It will be better with averaging


Resolution Analysis

Method 2:

Using a line built from other monitors, look at residual to the line.

Results comparable to method 1.

Position is known much better than the beam pipe diameter !


Summary -- Cavity Monitors

  • Working well, we have the G0 version of electronics

  • Good signals at 10 nA  Can measure Q

  • Plan to repeat scan ( Ibeam , X, Y )

  • with constant gains

2

2


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