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Position Sensitive Wall Current Monitor
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Position sensitive WCM |
The monitor is basically a
WCM.
A ceramic ring, diameter 100mm, length
40mm and wall thickness 5mm interrupts the image current as it flows
along with the beam on the inside surface of the vacuum chamber.
Distributed
around the ring are 32 resistors, each consisting of three 10Ω
resistors in series. A voltage develops across the resistors as the
wall current passes through.
A shielding box, with two Philips 2E8 ferrite
rings to get better LF response, surrounds all.
At four equally spaced points around the
ceramic ring, signals are picked off. Anzac H9 hybdrids (2MHz-2GHz)
are used to combine the signals into horizontal an vertical differences
and a sum signal.
The monitor is presently installed in
SS00
of the PS.
Some PU properties |
Bandwidth Σ: | 2.7MHz-1.5GHz |
Bandwidth Δ: | 9.4MHz-1.5GHz |
Rt : | 1.26 Ω |
Sx : | 40mm |
Sy : | 40mm |
References:
-
G. Schneider, "A 1.5GHz wide-band beam position and intensity monitor
for the electron-positron accumulator",
CERN-PS 87-9 (1987),
PAC'87, March 1987
- J. Belleman, "A note on frequency response equalization",
wcm00.pdf, March 2010
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Updated: Tuesday October 05 2021
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