Simulation of RF Cavity Dark Current in Presence of Helical Magnetic Field

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In order to produce muon beam of high enough quality to be used for a Muon Collider, its large phase space must be cooled several orders of magnitude. This task can be accomplished by ionization cooling. Ionization cooling consists of passing a high-emittance muon beam alternately through regions of low Z material, such as liquid hydrogen, and very high accelerating RF cavities within a multi-Tesla solenoidal focusing channel. But first high power tests of RF cavity with beryllium windows in solenoidal magnetic field showed a dramatic drop in accelerating gradient due to RF breakdowns. It has been concluded that external ... continued below

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10 pages

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Romanov, Gennady; Kashikhin, Vladimir & /Unlisted September 1, 2010.

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In order to produce muon beam of high enough quality to be used for a Muon Collider, its large phase space must be cooled several orders of magnitude. This task can be accomplished by ionization cooling. Ionization cooling consists of passing a high-emittance muon beam alternately through regions of low Z material, such as liquid hydrogen, and very high accelerating RF cavities within a multi-Tesla solenoidal focusing channel. But first high power tests of RF cavity with beryllium windows in solenoidal magnetic field showed a dramatic drop in accelerating gradient due to RF breakdowns. It has been concluded that external magnetic fields parallel to RF electric field significantly modifies the performance of RF cavities. However, magnetic field in Helical Cooling Channel has a strong dipole component in addition to solenoidal one. The dipole component essentially changes electron motion in a cavity compare to pure solenoidal case, making dark current less focused at field emission sites. The simulation of dark current dynamic in HCC performed with CST Studio Suit is presented in this paper.

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10 pages

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  • Report No.: FERMILAB-TM-2467-TD
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/992658 | External Link
  • Office of Scientific & Technical Information Report Number: 992658
  • Archival Resource Key: ark:/67531/metadc1012587

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  • September 1, 2010

Added to The UNT Digital Library

  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 23, 2017, 8:43 p.m.

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Romanov, Gennady; Kashikhin, Vladimir & /Unlisted. Simulation of RF Cavity Dark Current in Presence of Helical Magnetic Field, report, September 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1012587/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.