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Title: Commissioning of JLab Vertical Cavity Processing System for SRF Nb Single Cell and Multicell Cavity With HF-Free Pulse-Reverse Electopolishing

Abstract

Pulse reversed electropolishing of niobium SRF cavities, using a dilute aqueous H2SO4 electrolyte without HF yields equivalent RF performance with traditional EP. Comparing with present EP process for Nb SRF cavity which uses 1:10 volume ratio of HF (49%) and H2SO4 (98%), pulse reverse EP (also known as bipolar EP (BPEP)) is ecologically friendly and uses relatively benign electrolyte options for cavity processing. In this study, we report the commissioning of a new vertical cavity processing system for SRF Nb single cell and multi-cell cavities with HF-free pulse-reverse electropolishing at Jefferson Lab, together with RF test of cavities being processed. We report the scale-up challenges and interpretations from process R&D to implementation.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1473842
Report Number(s):
JLAB-ACC-18-2722; DOE/OR/23177-4453
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2018, 29 Apr - 04 May 2018. Vancouver, BC Canada
Country of Publication:
United States
Language:
English

Citation Formats

Tian, Hui, Lester, Mark J., Musson, John C., Phillips, H. Larry, Reece, Charles E., and Seaton, Chad. Commissioning of JLab Vertical Cavity Processing System for SRF Nb Single Cell and Multicell Cavity With HF-Free Pulse-Reverse Electopolishing. United States: N. p., 2018. Web. doi:10.18429/JACoW-IPAC2018-THPAL143.
Tian, Hui, Lester, Mark J., Musson, John C., Phillips, H. Larry, Reece, Charles E., & Seaton, Chad. Commissioning of JLab Vertical Cavity Processing System for SRF Nb Single Cell and Multicell Cavity With HF-Free Pulse-Reverse Electopolishing. United States. https://doi.org/10.18429/JACoW-IPAC2018-THPAL143
Tian, Hui, Lester, Mark J., Musson, John C., Phillips, H. Larry, Reece, Charles E., and Seaton, Chad. 2018. "Commissioning of JLab Vertical Cavity Processing System for SRF Nb Single Cell and Multicell Cavity With HF-Free Pulse-Reverse Electopolishing". United States. https://doi.org/10.18429/JACoW-IPAC2018-THPAL143. https://www.osti.gov/servlets/purl/1473842.
@article{osti_1473842,
title = {Commissioning of JLab Vertical Cavity Processing System for SRF Nb Single Cell and Multicell Cavity With HF-Free Pulse-Reverse Electopolishing},
author = {Tian, Hui and Lester, Mark J. and Musson, John C. and Phillips, H. Larry and Reece, Charles E. and Seaton, Chad},
abstractNote = {Pulse reversed electropolishing of niobium SRF cavities, using a dilute aqueous H2SO4 electrolyte without HF yields equivalent RF performance with traditional EP. Comparing with present EP process for Nb SRF cavity which uses 1:10 volume ratio of HF (49%) and H2SO4 (98%), pulse reverse EP (also known as bipolar EP (BPEP)) is ecologically friendly and uses relatively benign electrolyte options for cavity processing. In this study, we report the commissioning of a new vertical cavity processing system for SRF Nb single cell and multi-cell cavities with HF-free pulse-reverse electropolishing at Jefferson Lab, together with RF test of cavities being processed. We report the scale-up challenges and interpretations from process R&D to implementation.},
doi = {10.18429/JACoW-IPAC2018-THPAL143},
url = {https://www.osti.gov/biblio/1473842}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 2018},
month = {Sun Jul 01 00:00:00 EDT 2018}
}

Conference:
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