Third Interger Resonance Slow Extraction Using RFKO at High Space Charge

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A proposal to search for direct {mu} {yields} e conversion at Fermilab requires slow, resonant extraction of an intense proton beam. Large space charge forces will present challenges, partly due to the substantial betatron tune spread. The main challenges will be maintaining a uniform spill profile and moderate losses at the septum. We propose to use 'radio frequency knockout' (RFKO) for fine tuning the extraction. Strategies for the use of the RFKO method will be discussed here in the context of the Mu2e experiment. The feasibility of this method has been demonstrated in simulations. Tracking simulations show that optimal RFKO ... continued below

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Nagaslaev, V.; Amundson, J.; Johnstone, J.; Park, C.S.; Werkema, S. & /Fermilab September 15, 2011.

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A proposal to search for direct {mu} {yields} e conversion at Fermilab requires slow, resonant extraction of an intense proton beam. Large space charge forces will present challenges, partly due to the substantial betatron tune spread. The main challenges will be maintaining a uniform spill profile and moderate losses at the septum. We propose to use 'radio frequency knockout' (RFKO) for fine tuning the extraction. Strategies for the use of the RFKO method will be discussed here in the context of the Mu2e experiment. The feasibility of this method has been demonstrated in simulations. Tracking simulations show that optimal RFKO frequency modulation in case of the SC beam tune spread is substantially different from that of chromatic tune spread. FM should be centred at the bare betatron frequency rather than in the middle of the tune spread, and additional chromaticity must be added in order to facilitate rapid dilution of the dipole oscillations. Heating efficiency slowly decreases with the SC growing. Colored noise modulation (random signal within a given bandwidth) appears to be the most effective way of modulation, however its advantage over linear modulation is not very large, so practical reasons may prevail in the final choice between the two.

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3 pages

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  • Presented at 2nd International Particle Accelerator Conference: IPAC 2011, San Sebastian, Spain, 4-9 Sep 2011

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  • Report No.: FERMILAB-CONF-11-475-AD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 1031169
  • Archival Resource Key: ark:/67531/metadc831909

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  • September 15, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 30, 2016, 3:21 p.m.

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Nagaslaev, V.; Amundson, J.; Johnstone, J.; Park, C.S.; Werkema, S. & /Fermilab. Third Interger Resonance Slow Extraction Using RFKO at High Space Charge, article, September 15, 2011; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc831909/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.