The effect of beam intensity on the performance of beam position monitor
The current design of the beam position monitor (BPM) is based upon the approach of converting the amplitude modulation (AM) into phase angle modulation (PM). Consequently, the BPM is subject to the threshold effects which a PM system typically has. The threshold effects are caused by the signal-to-noise ratio (SNR) of the concerned system. For a BPM, its SNR is related to the operating intensity of the proton beam. The SNR degrades as the beam intensity lowers. Therefore, it is predictable that the threshold effects would take place when the beam intensity is lower than a certain level. An analysis was made to examine this situation. The result suggests that the BPM has a certain estimation bias. This bias is dependent on both the beam position and SNR. When this beam intensity is lower than a certain threshold, the estimation bias starts to increase dramatically, resulting in the BPM failure.
- OSTI ID:
- 127819
- Report Number(s):
- CONF-920376-; ISSN 0003-0503; TRN: 96:000295
- Journal Information:
- Bulletin of the American Physical Society, Vol. 37, Issue 9; Conference: Meeting of the American Physical Society, Indianapolis, IN (United States), 16-20 Mar 1992; Other Information: PBD: Dec 1992
- Country of Publication:
- United States
- Language:
- English
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