ECLOUD in PS2, PS+, SPS+: AN UPDATE

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We present an update of our results for the electron-cloud build-up for several upgrades proposed for the LHC injectors. Specifically, we have re-examined our published results for the ecloud heat load [1] from the perspective of numerical convergence of the simulations vis-a-vis the integration time step {Delta}t. We repeated most of the simulations with ever smaller values of {Delta}t until we reached stable results, indicating numerical convergence; this was achieved at 200-500 slices per bunch, depending on the particular case. In all cases examined, the simulated heat load decreases monotonically, until the limit is reached, as {Delta}t decreases in the ... continued below

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Furman, M.A. May 22, 2007.

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We present an update of our results for the electron-cloud build-up for several upgrades proposed for the LHC injectors. Specifically, we have re-examined our published results for the ecloud heat load [1] from the perspective of numerical convergence of the simulations vis-a-vis the integration time step {Delta}t. We repeated most of the simulations with ever smaller values of {Delta}t until we reached stable results, indicating numerical convergence; this was achieved at 200-500 slices per bunch, depending on the particular case. In all cases examined, the simulated heat load decreases monotonically, until the limit is reached, as {Delta}t decreases in the range explored, hence the stable results are more favorable vis-a-vis the heat load than the previous ones. This is particularly true for a bunch spacing t{sub b} = 25 ns.

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  • Joint CARE-HHH-APD, CARE-ELAN and EUROTEV-WP3mini-Workshop on Electron Cloud Clearing 'ECL2': Electron Cloud Effectsand Technological Consequences, CERN, 1-2 March2007

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  • Report No.: LBNL--61925-Update
  • Report No.: LBNL-61925
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 923346
  • Archival Resource Key: ark:/67531/metadc899697

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  • May 22, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 4:05 p.m.

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Furman, M.A. ECLOUD in PS2, PS+, SPS+: AN UPDATE, article, May 22, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc899697/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.