Mechanical and thermal analysis of beryllium windows for RF cavities in a muon cooling channel

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Thin beryllium windows (foils) may be utilized to increase shunt impedance of closed-cell RF cavities. These windows are subject to ohmic heating from RF currents. The resulting temperature gradients in the windows can produce out of plane displacements that detune the cavity frequency. The window displacement can be reduced or eliminated by pre-stressing the foils in tension. Because of possible variations during manufacture, it is important to quantify the actual prestress of a Be window before it is put into service. We present the thermal and mechanical analyses of such windows under typical operating conditions and describe a simple non-destructive ... continued below

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Li, Derun; Ladran, A.; Lozano, D. & Rimmer, R. May 30, 2002.

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Thin beryllium windows (foils) may be utilized to increase shunt impedance of closed-cell RF cavities. These windows are subject to ohmic heating from RF currents. The resulting temperature gradients in the windows can produce out of plane displacements that detune the cavity frequency. The window displacement can be reduced or eliminated by pre-stressing the foils in tension. Because of possible variations during manufacture, it is important to quantify the actual prestress of a Be window before it is put into service. We present the thermal and mechanical analyses of such windows under typical operating conditions and describe a simple non-destructive means to quantify the pre-stress using the acoustic signature of a window. Using finite element analysis, thin plate theory and physical measurements of the vibration modes of a window we attempted to characterize the actual Be window pre-stress in a small number of commercially sourced windows (30% of yield strength is typical). This method can be used for any window material and size, but this study focused on 16 cm diameter Be Windows ranging in thickness from 125 microns to 508 microns and with varying pre-stresses. The method can be used to nondestructively test future Be windows for the desired prestress.

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INIS; OSTI as DE00799628

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  • European Particle Accelerator Conference 2002 (EPAC 2002), Paris (FR), 06/03/2002--06/07/2002

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  • Report No.: LBNL--50708
  • Report No.: CBP Note - 438
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 799628
  • Archival Resource Key: ark:/67531/metadc739623

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 30, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 4, 2016, 1:36 p.m.

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Li, Derun; Ladran, A.; Lozano, D. & Rimmer, R. Mechanical and thermal analysis of beryllium windows for RF cavities in a muon cooling channel, article, May 30, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc739623/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.