SNS HOM Damping Requirements via Bunch Tracking

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Based on Higher Order Mode (HOM) field properties [1], the Spallation Neutron Source (SNS) HOM damping requirements have been determined by bunch tracking simulations. Transverse instabilities are found to be absent and transverse error magnifications are found to be acceptable if the loaded cavity Q for each mode is less than 10{sup 8} and the expected cavity-to-cavity frequency variation due to manufacturing tolerances is present. Longitudinal instabilities are absent if the loaded cavity Q for each HOM is less than 10{sup 8}, the loaded cavity Q for each non-pi fundamental mode has the expected value, and the expected cavity-to-cavity frequency ... continued below

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205 Kilobytes pages

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Sundelin, R.; Jeon, Dong-o; Kim, Sang-ho & Doleans, Marc June 1, 2001.

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Description

Based on Higher Order Mode (HOM) field properties [1], the Spallation Neutron Source (SNS) HOM damping requirements have been determined by bunch tracking simulations. Transverse instabilities are found to be absent and transverse error magnifications are found to be acceptable if the loaded cavity Q for each mode is less than 10{sup 8} and the expected cavity-to-cavity frequency variation due to manufacturing tolerances is present. Longitudinal instabilities are absent if the loaded cavity Q for each HOM is less than 10{sup 8}, the loaded cavity Q for each non-pi fundamental mode has the expected value, and the expected cavity-to-cavity frequency variation is present. Each of the two cavity types has three longitudinal modes that are close enough to a bunch spacing harmonic that one of the modes may occasionally get tuned onto the resonance; the power deposited as a function of Q has been calculated for this case. Deposited power [1] and transverse instabilities/magnifications [2] have also been determined analytically.

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205 Kilobytes pages

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  • PAC 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: JLAB-OTP-01-01
  • Report No.: DOE/ER/40150-1853
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 781928
  • Archival Resource Key: ark:/67531/metadc716104

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  • June 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:30 p.m.

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Sundelin, R.; Jeon, Dong-o; Kim, Sang-ho & Doleans, Marc. SNS HOM Damping Requirements via Bunch Tracking, article, June 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc716104/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.