High current CW beam profile monitors using transisiton radiation at CEBAF

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Description

One way of measuring the profile of CEBAF`s low emittance and high power beam is to use the Optical Transition Radiation (OTR) emitted from a thin foil surface when the electron beam passes through it. We present the design of a monitor using the forward OTR emitted from a 0.25 {mu}m carbon foil. We believe that the monitor will resolve three main issues: (i) whether the max temperature of the foil stays below the melting point, (ii) whether the beam loss remains below 0. 5%, in order not to trigger the machine protection system, and (iii) whether the monitor resolution ... continued below

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8 p.

Creation Information

Piot, P.; Denard, J.C.; Adderley, P; Capek, K. & Feldl, E. July 1, 1996.

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Description

One way of measuring the profile of CEBAF`s low emittance and high power beam is to use the Optical Transition Radiation (OTR) emitted from a thin foil surface when the electron beam passes through it. We present the design of a monitor using the forward OTR emitted from a 0.25 {mu}m carbon foil. We believe that the monitor will resolve three main issues: (i) whether the max temperature of the foil stays below the melting point, (ii) whether the beam loss remains below 0. 5%, in order not to trigger the machine protection system, and (iii) whether the monitor resolution (unlike that of synchrotron radiation monitors) is better than the product {lambda}{gamma}. It seems that the most serious limitation for CEBAF is the beam loss due to beam scattering. We present results from Keil`s theory and simulations from the computer code GEANT as well as measurements with Al foils with a 45 MeV electron beam. We also present a measurement of a 3.2 GeV beam profile that is much smaller than {lambda}{gamma}, supporting Rule & Fiorito`s calculations of the OTR resolution limit due to diffraction.

Physical Description

8 p.

Notes

INIS; OSTI as DE96006260

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  • Other Information: PBD: [1996]

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Identifier

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  • Other: DE96006260
  • Report No.: DOE/ER/40150--375
  • Report No.: CEBAF-PR--96-008
  • Grant Number: AC05-84ER40150
  • DOI: 10.2172/270654 | External Link
  • Office of Scientific & Technical Information Report Number: 270654
  • Archival Resource Key: ark:/67531/metadc667744

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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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  • July 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Dec. 1, 2015, 9:39 a.m.

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Piot, P.; Denard, J.C.; Adderley, P; Capek, K. & Feldl, E. High current CW beam profile monitors using transisiton radiation at CEBAF, report, July 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc667744/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.