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Title: Suppression of multipacting in high power RF couplers operating with superconducting cavities

Authors:
; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1416188
Grant/Contract Number:
SC0000661
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 856; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-01-08 20:12:34; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Ostroumov, P. N., Kazakov, S., Morris, D., Larter, T., Plastun, A. S., Popielarski, J., Wei, J., and Xu, T.. Suppression of multipacting in high power RF couplers operating with superconducting cavities. Netherlands: N. p., 2017. Web. doi:10.1016/j.nima.2017.02.081.
Ostroumov, P. N., Kazakov, S., Morris, D., Larter, T., Plastun, A. S., Popielarski, J., Wei, J., & Xu, T.. Suppression of multipacting in high power RF couplers operating with superconducting cavities. Netherlands. doi:10.1016/j.nima.2017.02.081.
Ostroumov, P. N., Kazakov, S., Morris, D., Larter, T., Plastun, A. S., Popielarski, J., Wei, J., and Xu, T.. Thu . "Suppression of multipacting in high power RF couplers operating with superconducting cavities". Netherlands. doi:10.1016/j.nima.2017.02.081.
@article{osti_1416188,
title = {Suppression of multipacting in high power RF couplers operating with superconducting cavities},
author = {Ostroumov, P. N. and Kazakov, S. and Morris, D. and Larter, T. and Plastun, A. S. and Popielarski, J. and Wei, J. and Xu, T.},
abstractNote = {},
doi = {10.1016/j.nima.2017.02.081},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 856,
place = {Netherlands},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nima.2017.02.081

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

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  • Multipacting (MP) in higher-order-mode (HOM) couplers of the International Linear Collider (ILC) baseline cavity and the Continuous Electron Beam Accelerator Facility (CEBAF) 12 GeV upgrade cavity is studied by using the ACE3P suites, developed by the Advanced Computations Department at SLAC. For the ILC cavity HOM coupler, the simulation results show that resonant trajectories exist in three zones, corresponding to an accelerating gradient range of 0.6-1.6 MV/m, 21-34 MV/m, 32-35 MV/m, and > 40MV/m, respectively. For the CEBAF 12 GeV upgrade cavity HOM coupler, resonant trajectories exist in one zone, corresponding to an accelerating gradient range of 6-13 MV/m. Potentialmore » implications of these MP barriers are discussed in the context of future high energy pulsed as well as medium energy continuous wave (CW) accelerators based on superconducting radio frequency cavities. Frequency scaling of MP's predicted in HOM couplers of the ILC, CBEAF upgrade, SNS and FLASH third harmonic cavity is given and found to be in good agreement with the analytical result based on the parallel plate model.« less
  • Simulations are now routinely performed that allow the prediction of electromagnetic, multipacting, thermal, and mechanical properties of couplers. From these studies, better designs have been conceived which can minimize potential problems ahead of construction. Judicious use of materials and the implementation of clean practices and of careful conditioning have gradually increased the power levels at which couplers can safely operate. Machine operation at hundreds of kilowatts has been achieved in CW at KEK and Cornell, and in a pulsed mode at the TESLA Test Facility (TTF). Test stand operations in CW at the megawatt level (Accelerator for the Production ofmore » Tritium) and in pulse mode at a peak power of 2 MW (Spallation Neutron Source, TTF version II) have been achieved. The recent progress indicates that the understanding of the behavior of fundamental power couplers is rapidly increasing and that optimal designs are being developed which will allow in the future to attain routine attainment of the megawatt power levels necessary for high-beam-power machines under construction and under study.« less