INITIAL OPERATION OF THE LEDA BEAM-INDUCED FLUORESCENCE DIAGNOSTIC

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A diagnostic based on beam-induced fluorescence has been developed and used to examine the expanded beam in the High-Energy Beam Transport (HEBT) section of the Low Energy Demonstration Accelerator (LEDA). The system consists of a camera, a gas injector, a spectrometer, and a control system. Gas is injected to provide a medium for the beam to excite, the camera captures the resulting image of the fluorescing gas, and the spectrometer measures the spectrum of the emitted light. EPICS was used to control the camera and acquire and store images. Data analysis is presently being performed offline. A Kodak DCS420m professional ... continued below

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406 Kilobytes pages

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Kamperschroer, James H.; Gilpatrick, J. Douglas; Gurd, Pamela A.; Madsen, David W.; Martinez, Derwin G.; O'Hara, James F. et al. June 2000.

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Description

A diagnostic based on beam-induced fluorescence has been developed and used to examine the expanded beam in the High-Energy Beam Transport (HEBT) section of the Low Energy Demonstration Accelerator (LEDA). The system consists of a camera, a gas injector, a spectrometer, and a control system. Gas is injected to provide a medium for the beam to excite, the camera captures the resulting image of the fluorescing gas, and the spectrometer measures the spectrum of the emitted light. EPICS was used to control the camera and acquire and store images. Data analysis is presently being performed offline. A Kodak DCS420m professional CCD camera is the primary component of the optical system. InterScience, Inc. modified the camera with the addition of a gain of 4000 image intensifier, thereby producing an intensified camera with a sensitivity of {approximately}0.5 milli-lux. Light is gathered with a 1 inch format, 16-160 mm, Computar zoom lens. This lens is attached to the camera via a Century Precision Optics relay lens. Images obtained using only hydrogen from the beam stop exhibited features not yet understood. Images with good signal-to-noise ratio were obtained with the injection of sufficient nitrogen to raise the HEBT pressure to 2-8x10{sup {minus}6} torr. Two strong nitrogen lines, believed to be of the first negative group of N{sub 2}{sup +}, were identified at 391 and 428 nm.

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406 Kilobytes pages

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  • Report No.: LA-UR-00-2361
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 769065
  • Archival Resource Key: ark:/67531/metadc719142

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  • June 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 22, 2016, 1:32 p.m.

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Kamperschroer, James H.; Gilpatrick, J. Douglas; Gurd, Pamela A.; Madsen, David W.; Martinez, Derwin G.; O'Hara, James F. et al. INITIAL OPERATION OF THE LEDA BEAM-INDUCED FLUORESCENCE DIAGNOSTIC, article, June 2000; New Mexico. (digital.library.unt.edu/ark:/67531/metadc719142/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.