Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules

Bane, Karl; Nantista, Christopher; Adolphsen, Chris; Raubenheimer, Tor; Saini, Arun; Solyak, Nikolay; Yakovlev, Vyacheslav

doi:10.1016/j.phpro.2015.11.057

Title: Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules

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Abstract

The superconducting cavities in the CW linacs of LCLS-II will operate at 2 K, where cooling is very expensive. One source of heat is presented by the higher order mode (HOM) power deposited by the beam. Due to the very short bunch length, especially in the L3 region, the LCLS-II beam spectrum extends into the terahertz range. Ceramic absorbers, at 70 K between cryomodules, are meant to absorb much of this power. In this report we perform two kinds of calculations to estimate the effectiveness of the absorbers and the fractional power that remains to be removed at 2 K.

Authors:

Bane, Karl ^[1]; Nantista, Christopher ^[1]; Adolphsen, Chris ^[1]; Raubenheimer, Tor ^[1]; Saini, Arun ^[2]; Solyak, Nikolay ^[2]; Yakovlev, Vyacheslav ^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Publication Date:: Thu Jan 01 00:00:00 EST 2015

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1236560

Grant/Contract Number:: AC03-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Physics Procedia

Additional Journal Information:: Journal Volume: 79; Journal Issue: C; Journal ID: ISSN 1875-3892

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconducting cavities; cryogenic heat load; impedance; wakefields; higher order modes

Citation Formats


                    Bane, Karl, Nantista, Christopher, Adolphsen, Chris, Raubenheimer, Tor, Saini, Arun, Solyak, Nikolay, and Yakovlev, Vyacheslav. Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules.  United States: N. p., 2015. 
Web.  doi:10.1016/j.phpro.2015.11.057.

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                    Bane, Karl, Nantista, Christopher, Adolphsen, Chris, Raubenheimer, Tor, Saini, Arun, Solyak, Nikolay, & Yakovlev, Vyacheslav. Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules.  United States.  https://doi.org/10.1016/j.phpro.2015.11.057

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                    Bane, Karl, Nantista, Christopher, Adolphsen, Chris, Raubenheimer, Tor, Saini, Arun, Solyak, Nikolay, and Yakovlev, Vyacheslav. Thu .  
"Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules".  United States.  https://doi.org/10.1016/j.phpro.2015.11.057.  https://www.osti.gov/servlets/purl/1236560.

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@article{osti_1236560,

  title        = {Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules},

  author       = {Bane, Karl and Nantista, Christopher and Adolphsen, Chris and Raubenheimer, Tor and Saini, Arun and Solyak, Nikolay and Yakovlev, Vyacheslav},

  abstractNote = {The superconducting cavities in the CW linacs of LCLS-II will operate at 2 K, where cooling is very expensive. One source of heat is presented by the higher order mode (HOM) power deposited by the beam. Due to the very short bunch length, especially in the L3 region, the LCLS-II beam spectrum extends into the terahertz range. Ceramic absorbers, at 70 K between cryomodules, are meant to absorb much of this power. In this report we perform two kinds of calculations to estimate the effectiveness of the absorbers and the fractional power that remains to be removed at 2 K.},

  doi          = {10.1016/j.phpro.2015.11.057},

  journal      = {Physics Procedia},

  number       = C,

  volume       = 79,

  place        = {United States},

  year         = {Thu Jan 01 00:00:00 EST 2015},

  month        = {Thu Jan 01 00:00:00 EST 2015}

}

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