In situ SRF cavity processing using optical ionization of gases

Legg, Robert; Powers, Thomas H.

Title: In situ SRF cavity processing using optical ionization of gases

Abstract

A system and method for the in situ processing of internal SRF cavity surfaces to reduce field emission and improve maximum gradient. An electromagnetic radiation source is introduced in the bore of a superconducting cavity to enhance ionization or dissociation of gases which then remove contaminants from the surface of the cavity, either through direct surface bombardment, chemical reaction or through the production of radiation which interacts with the contaminants. An RF or low frequency electromagnetic field may be established in the cavity which further enhances the ionization or dissociation process and may cause the ions to bombard sites with enhanced electric fields. The invention removes the requirement that the RF field be sufficient by itself to ionize gas in the cavity.

Inventors:: Legg, Robert; Powers, Thomas H.

Issue Date:: 2020-09-29

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1735314

Patent Number(s):: 10787892

Application Number:: 16/568,370

Assignee:: Jefferson Science Associates, LLC (Newport News, VA)

Patent Classifications (CPCs):: E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING

H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE

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E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
E21B36/04 - using electrical heaters
E21B43/247 - in association with fracturing processes {or crevice forming processes}

H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE
H05H7/20 - with superconductive walls

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DOE Contract Number:: AC05-06OR23177

Resource Type:: Patent

Resource Relation:: Patent File Date: 09/12/2019

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats


                    Legg, Robert, and Powers, Thomas H. In situ SRF cavity processing using optical ionization of gases.  United States: N. p., 2020. 
        Web.

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                    Legg, Robert, & Powers, Thomas H. In situ SRF cavity processing using optical ionization of gases.  United States.

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                    Legg, Robert, and Powers, Thomas H. Tue .  
        "In situ SRF cavity processing using optical ionization of gases".  United States.  https://www.osti.gov/servlets/purl/1735314.

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@article{osti_1735314,

  title        = {In situ SRF cavity processing using optical ionization of gases},

  author       = {Legg, Robert and Powers, Thomas H.},

  abstractNote = {A system and method for the in situ processing of internal SRF cavity surfaces to reduce field emission and improve maximum gradient. An electromagnetic radiation source is introduced in the bore of a superconducting cavity to enhance ionization or dissociation of gases which then remove contaminants from the surface of the cavity, either through direct surface bombardment, chemical reaction or through the production of radiation which interacts with the contaminants. An RF or low frequency electromagnetic field may be established in the cavity which further enhances the ionization or dissociation process and may cause the ions to bombard sites with enhanced electric fields. The invention removes the requirement that the RF field be sufficient by itself to ionize gas in the cavity.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2020},

  month        = {9}

}

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