The ecloud measurement setup in the Main Injector

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Ecloud has been observed in many high intensity accelerators which can limit the amount of current that can be stored in them. In particular, for ProjectX, the amount of beam current that will be stored in the MI (Main Injector) will be {approx}160 x 10{sup 12} protons while the present maximum intensity is {approx}45 x 10{sup 12} protons which is about 3.5x less beam. Although ecloud has been observed in the MI, it has not caused instabilities at the present running conditions. However, there is no guarantee that instabilities caused by ecloud will not be a problem at ProjectX intensities. ... continued below

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7 pages

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Tan, C.Y.; Backfish, M.; Zwaska, R. & /Fermilab December 1, 2010.

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Ecloud has been observed in many high intensity accelerators which can limit the amount of current that can be stored in them. In particular, for ProjectX, the amount of beam current that will be stored in the MI (Main Injector) will be {approx}160 x 10{sup 12} protons while the present maximum intensity is {approx}45 x 10{sup 12} protons which is about 3.5x less beam. Although ecloud has been observed in the MI, it has not caused instabilities at the present running conditions. However, there is no guarantee that instabilities caused by ecloud will not be a problem at ProjectX intensities. Therefore, a program has been started to study the ecloud effects with both computer simulations and experiments. In this paper, we will be focusing our attention on how coatings can affect the production of secondary electrons. We have installed an ecloud measurement setup in a straight section of MI which consists of one coated and one uncoated beam pipe with the same physical dimensions and at the same location, together with four retarding field analyzers (RFAs) and three sets of beam position monitors (BPMs) which can be used for the microwave measurements. An ecloud measurement setup was installed in a straight section of the Main Injector in 2009. The goal of the setup was to compare the characteristics of different beam pipe coatings when subjected to proton beam. The setup consists of one coated and one uncoated beam pipe with the same physical dimensions installed at the same location. Four RFAs (retarding field analyzers) and three BPMs (beam position monitors) used for microwave measurements have been used to measure the ecloud densities. The RFAs have performed very well and have collected both the time evolution and energy distribution of the ecloud for bare and two types of beam pipe coatings.

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7 pages

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  • Presented at 49th ICFA Advance Beam Dynamics Workshop on Electron Cloud Physics (ECLOUD10), Ithaca, New York, 8-12 Oct 2010

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  • Report No.: FERMILAB-CONF-10-508-AD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 1005350
  • Archival Resource Key: ark:/67531/metadc840739

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  • December 1, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Aug. 29, 2016, 8:08 p.m.

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Tan, C.Y.; Backfish, M.; Zwaska, R. & /Fermilab. The ecloud measurement setup in the Main Injector, article, December 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc840739/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.