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Title: Microphonics Passive Damping

Abstract

Different types of external loads on the resonator walls predetermine the main working conditions of the SRF cavities. The most important of them are very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape. For pulsed operation, the Lorentz forces usually play the decisive role for the cavity design. For CW operation, the liquid helium vessel pressure instability even for 2K operations is the source of large microphonics. All deformations resulting from any type of external loads on cavity walls lead to shifts in the working RF frequency in the range of hundreds of kHz. Taking into account high Q-factor of SC cavities such a large frequency shift takes the cavity out of operation. Here we present and discuss the achievements and problems of microphonics passive damping in different type SRF cavities.

Authors:
 [1];  [2];  [3]
  1. Julich, Forschungszentrum
  2. Euclid Techlabs, Solon
  3. Fermilab
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:
1457163
Report Number(s):
FERMILAB-CONF-17-673-TD
1669443
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 18th International Conference on RF Superconductivity, Lanzhou, China, 07/17-07/21/2017
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Zaplatin, Evgeny, Kanareykin, Alexei, and Yakovlev, Vyacheslav. Microphonics Passive Damping. United States: N. p., 2018. Web. doi:10.18429/JACoW-SRF2017-TUPB020.
Zaplatin, Evgeny, Kanareykin, Alexei, & Yakovlev, Vyacheslav. Microphonics Passive Damping. United States. doi:10.18429/JACoW-SRF2017-TUPB020.
Zaplatin, Evgeny, Kanareykin, Alexei, and Yakovlev, Vyacheslav. Mon . "Microphonics Passive Damping". United States. doi:10.18429/JACoW-SRF2017-TUPB020. https://www.osti.gov/servlets/purl/1457163.
@article{osti_1457163,
title = {Microphonics Passive Damping},
author = {Zaplatin, Evgeny and Kanareykin, Alexei and Yakovlev, Vyacheslav},
abstractNote = {Different types of external loads on the resonator walls predetermine the main working conditions of the SRF cavities. The most important of them are very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape. For pulsed operation, the Lorentz forces usually play the decisive role for the cavity design. For CW operation, the liquid helium vessel pressure instability even for 2K operations is the source of large microphonics. All deformations resulting from any type of external loads on cavity walls lead to shifts in the working RF frequency in the range of hundreds of kHz. Taking into account high Q-factor of SC cavities such a large frequency shift takes the cavity out of operation. Here we present and discuss the achievements and problems of microphonics passive damping in different type SRF cavities.},
doi = {10.18429/JACoW-SRF2017-TUPB020},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}

Conference:
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