805 MHz and 201 MHz RF cavity development for MUCOOL

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A muon cooling channel calls for very high acceleratinggradient RF structures to restore the energy lost by muons in theabsorbers. The RF structures have to be operated in a strong magneticfield and thus the use of superconducting RF cavities is excluded. Toachieve a high shunt impedance while maintaining a large enough apertureto accommodate a large transverse emittance muon beam, the cavity designadopted is a pillbox-like geometry with thin Be foils to terminate theelectromagnetic field at the cavity iris. The possibility of using gridsof thin-walled metallic tubes for the termination is also being explored.Many of the RF-related issues for muon cooling ... continued below

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DLi@lbl.gov October 10, 2002.

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A muon cooling channel calls for very high acceleratinggradient RF structures to restore the energy lost by muons in theabsorbers. The RF structures have to be operated in a strong magneticfield and thus the use of superconducting RF cavities is excluded. Toachieve a high shunt impedance while maintaining a large enough apertureto accommodate a large transverse emittance muon beam, the cavity designadopted is a pillbox-like geometry with thin Be foils to terminate theelectromagnetic field at the cavity iris. The possibility of using gridsof thin-walled metallic tubes for the termination is also being explored.Many of the RF-related issues for muon cooling channels are being studiedboth theoretically and experimentally using an 805 MHz cavity that has apillbox-like geometry with thin Be windows to terminate the cavityaperture. The design and performance of this cavity are reported here.High-power RF tests of the 805 MHz cavity are in progress at Lab G inFermilab. The cavity has exceeded its design gradient of 30 MV/m,reaching 34 MV/m without external magnetic field. No surface damage wasobserved at this gradient. The cavity is currently under conditioning atLab G with an external magnetic field of 2.5 T. We also present here a201 MHz cavity design for muoncooling channels. The proposed cavitydesign is also suitable for use in a proof-of-principle Muon IonizationCooling Experiment (MICE).

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  • Journal Name: Journal of Physics G: Nuclear and ParticlePhysics; Journal Volume: 19; Journal Issue: 8; Related Information: Journal Publication Date: 08/2003

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  • Report No.: LBNL--51651
  • Report No.: CBP Note - 607
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 917802
  • Archival Resource Key: ark:/67531/metadc887129

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  • October 10, 2002

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 1:33 p.m.

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DLi@lbl.gov. 805 MHz and 201 MHz RF cavity development for MUCOOL, article, October 10, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc887129/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.