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Title: A machine protection beam position monitor system

Abstract

Loss of the stored beam in an uncontrolled manner can cause damage to the PEP-II B Factory. We describe here a device which detects large beam position excursions or unexpected beam loss and triggers the beam abort system to extract the stored beam safely. The bad-orbit abort trigger beam position monitor (BOAT BPM) generates a trigger when the beam orbit is far off the center (>20 mm), or rapid beam current loss (dI/dT) is detected. The BOAT BPM averages the input signal over one turn (136 kHz). AM demodulation is used to convert input signals at 476 MHz to baseband voltages. The detected signal goes to a filter section for suppression of the revolution frequency, then on to amplifiers, dividers, and comparators for position and current measurements and triggering. The derived current signal goes to a special filter, designed to perform dI/dT monitoring at fast, medium, and slow current loss rates. The BOAT BPM prototype test results confirm the design concepts.

Authors:
; ;  [1]
  1. Stanford Linear Accelerator Center Stanford, California 94309 (United States)
Publication Date:
OSTI Identifier:
21202385
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 451; Journal Issue: 1; Conference: 8. beam instrumentation workshop, Stanford, CA (United States), 4-7 May 1998; Other Information: DOI: 10.1063/1.57017; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; AMPLIFIERS; BEAM CURRENTS; BEAM EXTRACTION; BEAM MONITORING; BEAM MONITORS; BEAM POSITION; DESIGN; ELECTROMAGNETIC FILTERS; ELECTRON BEAMS; KHZ RANGE; MESON FACTORIES; MHZ RANGE; ORBITS; PARTICLE LOSSES; PEP STORAGE RINGS; POSITRON BEAMS; RELATIVISTIC RANGE; SIGNALS

Citation Formats

Medvedko, E, Smith, S, and Fisher, A. A machine protection beam position monitor system. United States: N. p., 1998. Web. doi:10.1063/1.57017.
Medvedko, E, Smith, S, & Fisher, A. A machine protection beam position monitor system. United States. https://doi.org/10.1063/1.57017
Medvedko, E, Smith, S, and Fisher, A. 1998. "A machine protection beam position monitor system". United States. https://doi.org/10.1063/1.57017.
@article{osti_21202385,
title = {A machine protection beam position monitor system},
author = {Medvedko, E and Smith, S and Fisher, A},
abstractNote = {Loss of the stored beam in an uncontrolled manner can cause damage to the PEP-II B Factory. We describe here a device which detects large beam position excursions or unexpected beam loss and triggers the beam abort system to extract the stored beam safely. The bad-orbit abort trigger beam position monitor (BOAT BPM) generates a trigger when the beam orbit is far off the center (>20 mm), or rapid beam current loss (dI/dT) is detected. The BOAT BPM averages the input signal over one turn (136 kHz). AM demodulation is used to convert input signals at 476 MHz to baseband voltages. The detected signal goes to a filter section for suppression of the revolution frequency, then on to amplifiers, dividers, and comparators for position and current measurements and triggering. The derived current signal goes to a special filter, designed to perform dI/dT monitoring at fast, medium, and slow current loss rates. The BOAT BPM prototype test results confirm the design concepts.},
doi = {10.1063/1.57017},
url = {https://www.osti.gov/biblio/21202385}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 451,
place = {United States},
year = {Thu Dec 10 00:00:00 EST 1998},
month = {Thu Dec 10 00:00:00 EST 1998}
}