The Beam Loss Monitors at CEBAF

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The CEBAF beam will carry about 800 kW of power concentrated into a 200 zm diameter. Current estimates are that a stray beam will burn through the vacuum wall within 50226100 zsec. The CEBAF Fast Shutdown (FSD) system have been designed to prevent such an occurrence.Intial estimates of the time constraints dictated that FSD sensor functions would have about 10 zsec to detect and forward a fault to the FSD. The BLM is one of the sensor functions; therefore, we designed it to this specification. Reliability of the FSD was a critical concern that dictated a 5 MHz permission signal ... continued below

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page(s) 141-154

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Perry, John October 1, 1990.

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Description

The CEBAF beam will carry about 800 kW of power concentrated into a 200 zm diameter. Current estimates are that a stray beam will burn through the vacuum wall within 50226100 zsec. The CEBAF Fast Shutdown (FSD) system have been designed to prevent such an occurrence.Intial estimates of the time constraints dictated that FSD sensor functions would have about 10 zsec to detect and forward a fault to the FSD. The BLM is one of the sensor functions; therefore, we designed it to this specification. Reliability of the FSD was a critical concern that dictated a 5 MHz permission signal sent from the sensor function; permission exists when the signal is present, and is removed if the signal is not present for any reason, including system failure. A strong desire was expressed among the CEBAF design community for a short history of the radiation levels before a fault condition. All these considerations went into the design of the BLM system.

Physical Description

page(s) 141-154

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  • Talk compiled for Workshop On Particle Beam Instrumentation, 1-4 Oct 1990, Batavia, Illinois

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  • Report No.: CEBAF-PR-90-22
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 954178
  • Archival Resource Key: ark:/67531/metadc934641

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1990

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 6, 2016, 7:23 p.m.

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Perry, John. The Beam Loss Monitors at CEBAF, article, October 1, 1990; [Newport News, Virginia]. (digital.library.unt.edu/ark:/67531/metadc934641/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.