Longitudinal impedance of capacitive pick-up electrodes: Calculations and comparison with measurements
In order to obtain high sensitivity over a broad frequency range, split cylinder capacitive pick-up electrodes have been adopted as the beam position monitors (BPMs) for the AGS booster. Numerical simulation and prototype measurements have been employed to find the coupling impedance of a BPM. The impedance was calculated using the MAFIA computer codes, and measurements were made using a coaxial wire. We found that the measured impedance depended strongly on external electronics, which could not be modeled using the computer code. Additionally, the calculated impedance is a function of beam velocity, which was not studied in the measurements. Only by using both could a reliable bound on the shunt impedance be obtained. We find that the longitudinal impedance of the BPMs is negligible for normal operating conditions in the booster.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 10173203
- Report Number(s):
- BNL-47103; CONF-920706-19; ON: DE92019499
- Resource Relation:
- Conference: International conference on high energy accelerators,Hamburg (Germany),20-24 Jul 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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