Experiences from First Top-Off Injection at the Stanford Synchrotron Radiation Lightsource

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As the Stanford Synchrotron Radiation Lightsource (SSRL) of the SLAC National Accelerator Laboratory (SLAC) is moving toward Top-Off injection mode, SLAC's Radiation Protection Department is working with SSRL on minimizing the radiological hazards of this mode. One such hazard is radiation that is created inside the accelerator concrete enclosure by injected beam. Since during Top-Off injection the stoppers that would otherwise isolate the storage ring from the experimental area stay open, the stoppers no longer prevent such radiation from reaching the experimental area. The level of this stray radiation was measured in April 2008 during the first Top-Off injection tests. ... continued below

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6 pages

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Bauer, J.M.; Liu, J.C.; Prinz, A.; Rokni, S.H. & /SLAC December 11, 2009.

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As the Stanford Synchrotron Radiation Lightsource (SSRL) of the SLAC National Accelerator Laboratory (SLAC) is moving toward Top-Off injection mode, SLAC's Radiation Protection Department is working with SSRL on minimizing the radiological hazards of this mode. One such hazard is radiation that is created inside the accelerator concrete enclosure by injected beam. Since during Top-Off injection the stoppers that would otherwise isolate the storage ring from the experimental area stay open, the stoppers no longer prevent such radiation from reaching the experimental area. The level of this stray radiation was measured in April 2008 during the first Top-Off injection tests. They revealed radiation dose rates of up to 18 microSv/h (1.8 millirem/h) outside the experimental hutches, significantly higher than our goal of 1 microSv/h (0.1 millirem/h). Non-optimal injection increased the measured dose rates by a factor two. Further tests in 2008 indicated that subsequent improvements by SSRL to the injection system have reduced the dose rates to acceptable levels. This presentation describes the studies performed before the Top-Off tests, the tests themselves and their major results (both under initial conditions and after improvements were implemented), and presents the controls being implemented for full and routine Top-Off injection.

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6 pages

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  • Presented at5th International Workshop on Radiation Safety at Synchrotron Radiation Sources, Trieste, Italy, 5/21/2009-5/23/2009

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  • Report No.: SLAC-PUB-13825
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 969247
  • Archival Resource Key: ark:/67531/metadc928887

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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.

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  • December 11, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:24 p.m.

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Bauer, J.M.; Liu, J.C.; Prinz, A.; Rokni, S.H. & /SLAC. Experiences from First Top-Off Injection at the Stanford Synchrotron Radiation Lightsource, article, December 11, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc928887/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.