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Title: A Flexible, Low Cost, Beam Loss Monitor Evaluation System

Abstract

A flexible, low cost, Beam Loss Monitor (BLM) Evaluation System based on Bergoz BLMs has been developed. Monitors can easily be moved to any location for beam loss investigations and/or monitor usefulness evaluations. Different PC pulse counting cards are compared and tested for this application using the display software developed based on LabVIEW. Beam problems uncovered with this system are presented.

Authors:
; ; ;  [1]
  1. National Synchrotron Research Center (NSRC), PO Box 93, Nakorn Ratchasema (Thailand)
Publication Date:
OSTI Identifier:
21049303
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436027; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM MONITORING; BEAM MONITORS; COMPUTER CODES; EVALUATION; LOSSES; PARTICLE BEAMS; PARTICLE LOSSES; PULSES

Citation Formats

Hoyes, George Garnet, Pimol, Piti, Juthong, Nawin, and Attaphibal, Malee. A Flexible, Low Cost, Beam Loss Monitor Evaluation System. United States: N. p., 2007. Web. doi:10.1063/1.2436027.
Hoyes, George Garnet, Pimol, Piti, Juthong, Nawin, & Attaphibal, Malee. A Flexible, Low Cost, Beam Loss Monitor Evaluation System. United States. doi:10.1063/1.2436027.
Hoyes, George Garnet, Pimol, Piti, Juthong, Nawin, and Attaphibal, Malee. Fri . "A Flexible, Low Cost, Beam Loss Monitor Evaluation System". United States. doi:10.1063/1.2436027.
@article{osti_21049303,
title = {A Flexible, Low Cost, Beam Loss Monitor Evaluation System},
author = {Hoyes, George Garnet and Pimol, Piti and Juthong, Nawin and Attaphibal, Malee},
abstractNote = {A flexible, low cost, Beam Loss Monitor (BLM) Evaluation System based on Bergoz BLMs has been developed. Monitors can easily be moved to any location for beam loss investigations and/or monitor usefulness evaluations. Different PC pulse counting cards are compared and tested for this application using the display software developed based on LabVIEW. Beam problems uncovered with this system are presented.},
doi = {10.1063/1.2436027},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • The design of the beam loss monitor system for the Argonne National Laboratory Advanced Photon Source is based on using a number of air dielectric coaxial cables as long ionization chambers. The coaxial cables are multiplexed into a high sensitivity DC current-to-voltage converter, which provides an output proportional to the average loss rate over the length of the multiplexed cable. Losses of sufficient amplitude generate measurable voltage pulses on the coaxial cable at a location near the loss point. Multiplexed pulse timing circuits determine the location of the losses by measuring the time at which these voltage pulses arrive atmore » the beginning of the coaxial cable. The loss monitor system has been tested on the SPEAR accelerator at SSRL and was demonstrated to be as sensitive as the DCCT. Preliminary performance data from the APS injector show that the sensitivities of the current-to-voltage converter circuit are about ten picoamperes of loss monitor signal per picocoulomb per second beam loss rate. The corresponding pulse sensitivity is about 28 {mu}V pulse amplitude in the coaxial cable per picocoulomb of loss. Both these sensitivities are at 300-MeV beam energies. The loss monitor has proven useful in initial commissioning of the injector. Further data will be available as accelerator construction and commissioning continue. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.« less
  • The beam bunches extracted from the TRIUMF cyclotron are usually about 4 ns long, contain {similar_to}4{times}10{sup 7} protons, and are spaced at 43 ns. A wall current monitor capable of giving the charge distribution within a bunch, on a bunch by bunch basis, has recently been installed together with a sampling system for routine display in the control room. The wall current monitor is enclosed in a vacuum vessel and no ceramic spacer is required. This enhances the response to high frequencies; ferrite rings extend the low frequency response. Bench measurements show a flat response between a few hundred kilohertzmore » and 4.6 GHz. For a permanent display in the control room the oscilloscope will be replaced by a Stanford Research Systems fast sampler module, a scanner module, and an interface module made at TRIUMF. The time to acquire one 10 ns distribution encompassing the beam bunch is 30 ms with a sample width of 100 ps and an average sample spacing of 13 ps. The scan, sample, and retrace signals are buffered and carried on 70 m differential lines to the control room. An analog scope in XYZ mode provides a real time display. Signal averaging can be performed by using a digital oscilloscope in YT mode.« less
  • Considerable cost savings can be realized if the metal container used for lithium-based batteries is replaced with a flexible multi-laminate containment commonly used in the food packaging industry. This laminate structure must have air, moisture, and electrolyte barrier capabilities, be resistant to hydrogen-fluoride attack, and be heat-sealable. After extensive screening of commercial films, the polyethylene and polypropylene classes of polymers were found to have an adequate combination of mechanical, permeation, and seal-strength properties. The search for a better film and adhesive is ongoing.