RF Breakdown in Normal Conducting Single-Cell Structures

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Operating accelerating gradient in normal conducting accelerating structures is often limited by rf breakdown. The limit depends on multiple parameters, including input rf power, rf circuit, cavity shape and material. Experimental and theoretical study of the effects of these parameters on the breakdown limit in full scale structures is difficult and costly. We use 11.4 GHz single-cell traveling wave and standing wave accelerating structures for experiments and modeling of rf breakdown behavior. These test structures are designed so that the electromagnetic fields in one cell mimic the fields in prototype multicell structures for the X-band linear collider. Fields elsewhere in ... continued below

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3 pages

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Dolgashev, V.A.; Nantista, C.D.; Tantawi, S.G.; /SLAC; Higashi, Y.; Higo, T. et al. February 22, 2006.

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Operating accelerating gradient in normal conducting accelerating structures is often limited by rf breakdown. The limit depends on multiple parameters, including input rf power, rf circuit, cavity shape and material. Experimental and theoretical study of the effects of these parameters on the breakdown limit in full scale structures is difficult and costly. We use 11.4 GHz single-cell traveling wave and standing wave accelerating structures for experiments and modeling of rf breakdown behavior. These test structures are designed so that the electromagnetic fields in one cell mimic the fields in prototype multicell structures for the X-band linear collider. Fields elsewhere in the test structures are significantly lower than that of the single cell. The setup uses matched mode converters that launch the circular TM{sub 01} mode into short test structures. The test structures are connected to the mode launchers with vacuum rf flanges. This setup allows economic testing of different cell geometries, cell materials and preparation techniques with short turn-around time. Simple 2D geometry of the test structures simplifies modeling of the breakdown currents and their thermal effects.

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3 pages

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  • Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 5/16/2005-5/20/2005

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  • Report No.: SLAC-PUB-11707
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 876600
  • Archival Resource Key: ark:/67531/metadc878507

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Office of Scientific & Technical Information Technical Reports

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  • February 22, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 8:23 p.m.

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Dolgashev, V.A.; Nantista, C.D.; Tantawi, S.G.; /SLAC; Higashi, Y.; Higo, T. et al. RF Breakdown in Normal Conducting Single-Cell Structures, article, February 22, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc878507/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.