Design and upgrade of a compact imaging system for the APS linac bunch compressor.

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We present the design, performance, and recent upgrade of a high-resolution, high-charge-sensitivity imaging camera and beam position monitor (BPM) system for the APS linac beam profile measurement. Visible light is generated from the incoming electron beam using standard YAG or optical transition radiation (OTR) converter screens. Two CCD cameras share the light through a beam splitter, each with its own imaging optics. Normally, one camera is configured with high magnification and the other with large field of view. In a different lens configuration, one of the cameras focuses at the far field, allowing the measurement of beam divergence using an ... continued below

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Yang, B. X. Y.; Rotela, E. R.; Kim, S. H. K.; Lill, R. L. & Sharma, S. S. June 28, 2002.

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We present the design, performance, and recent upgrade of a high-resolution, high-charge-sensitivity imaging camera and beam position monitor (BPM) system for the APS linac beam profile measurement. Visible light is generated from the incoming electron beam using standard YAG or optical transition radiation (OTR) converter screens. Two CCD cameras share the light through a beam splitter, each with its own imaging optics. Normally, one camera is configured with high magnification and the other with large field of view. In a different lens configuration, one of the cameras focuses at the far field, allowing the measurement of beam divergence using an OTR screen, while the other camera simultaneous measures the beam size. A four-position actuator was installed recently to provide the option of two screens, a wakefield shield, and an in situ calibration target. A compact S-band beam position monitor electrode was designed to mount directly on the flag. The BPM rf circuit was fabricated from a machinable ceramic (MACOR) cylinder substrate, and the copper electrodes were deposited on the substrate. The new design and precision fabrication process make it viable to explore more complex microstrip components printed on the substrate and higher frequency applications. The proximity of the BPM and the camera (< 5 cm) will provide a precise calibration platform to study shot-to-shot jitter, long-term stability of both systems, and the dependence of BPM signal on beam properties (size, charge distribution) due to nonlinearity.

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  • BIW 2002, Upton, NY (US), 05/06/2002--05/09/2002

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  • Report No.: ANL/AOD/CP-108043
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 797904
  • Archival Resource Key: ark:/67531/metadc733874

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  • June 28, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 30, 2016, 5:08 p.m.

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Yang, B. X. Y.; Rotela, E. R.; Kim, S. H. K.; Lill, R. L. & Sharma, S. S. Design and upgrade of a compact imaging system for the APS linac bunch compressor., article, June 28, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc733874/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.