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Title: Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity

Abstract

Conduction-cooling of superconducting radiofrequency (SRF) cavities using closedcycle cryocoolers can lead to compact linear accelerators by eliminating liquid helium and the associated infrastructure. In this paper, we present the first-ever experimental demonstration of continuous wave (cw) accelerating gradients on a niobium SRF cavity that is cooled without using liquid helium. In a newly developed experimental apparatus, a single-cell, 650 MHz niobium cavity was conductively coupled to a 2 W @ 4.2 K pulse tube cryocooler using a high-purity aluminium thermal link. The cw accelerating gradient slightly exceeded 1.5 MV/m, a limit imposed by our RF power supply. Using simple scaling, we project that the niobium cavity when coated with Nb3Sn and operated on the same experimental setup can produce >10 MV/m cw accelerating gradients.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Fermilab
  2. Euclid Techlabs, Bolingbrook
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1572517
Report Number(s):
FERMILAB-CONF-19-351-DI-LDRD-TD
oai:inspirehep.net:1761310
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Dhuley, R. C., Geelhoed, M. I., Zhao, Y., Terechkine, I., Alvarez, M., Prokofiev, O., and Thangaraj, J. C.T. Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity. United States: N. p., 2019. Web.
Dhuley, R. C., Geelhoed, M. I., Zhao, Y., Terechkine, I., Alvarez, M., Prokofiev, O., & Thangaraj, J. C.T. Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity. United States.
Dhuley, R. C., Geelhoed, M. I., Zhao, Y., Terechkine, I., Alvarez, M., Prokofiev, O., and Thangaraj, J. C.T. Tue . "Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity". United States. https://www.osti.gov/servlets/purl/1572517.
@article{osti_1572517,
title = {Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity},
author = {Dhuley, R. C. and Geelhoed, M. I. and Zhao, Y. and Terechkine, I. and Alvarez, M. and Prokofiev, O. and Thangaraj, J. C.T.},
abstractNote = {Conduction-cooling of superconducting radiofrequency (SRF) cavities using closedcycle cryocoolers can lead to compact linear accelerators by eliminating liquid helium and the associated infrastructure. In this paper, we present the first-ever experimental demonstration of continuous wave (cw) accelerating gradients on a niobium SRF cavity that is cooled without using liquid helium. In a newly developed experimental apparatus, a single-cell, 650 MHz niobium cavity was conductively coupled to a 2 W @ 4.2 K pulse tube cryocooler using a high-purity aluminium thermal link. The cw accelerating gradient slightly exceeded 1.5 MV/m, a limit imposed by our RF power supply. Using simple scaling, we project that the niobium cavity when coated with Nb3Sn and operated on the same experimental setup can produce >10 MV/m cw accelerating gradients.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}

Conference:
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