Physics and material science of ultra-high quality factor superconducting resonator /

Saved in:
Bibliographic Details
Author / Creator:Vostrikov, Alexander, author.
Imprint:2015.
Ann Arbor : ProQuest Dissertations & Theses, 2015
Description:1 electronic resource (102 pages)
Language:English
Format: E-Resource Dissertations
Local Note:School code: 0330
URL for this record:http://pi.lib.uchicago.edu/1001/cat/bib/10773337
Hidden Bibliographic Details
Other authors / contributors:University of Chicago. degree granting institution.
ISBN:9781339099002
Notes:Advisors: Young-Kee Kim; Alexander Romanenko Committee members: Emil J. Martinec; David Schuster; Steven J. Sibener.
Dissertation Abstracts International, Volume: 77-02(E), Section: B.
English
Summary:The nitrogen doping into niobium superconducting radio frequency cavity walls aiming to improve the fundamental mode quality factor is the subject of the research in the given work. Quantitative nitrogen diffusion into niobium model calculating the concentration profile was developed. The model estimations were confirmed with secondary ion mass spectrometry technique measurements. The model made controlled nitrogen doping recipe optimization possible. As a result the robust reproducible recipe for SRF cavity walls treatment with nitrogen doping was developed. The cavities produced with optimized recipe met LCLS--II requirements on quality factor of 2. · 10 10 at acceleration field of 16~MV/m.
The microscopic effects of nitrogen doping on superconducting niobium properties were studied with low energy muon spin rotation technique and magnetometer measurements. No significant effect of nitrogen on the following features was found: electron mean free path, magnetic field penetration depth, and upper and surface critical magnetic fields. It was detected that for nitrogen doped niobium samples magnetic flux starts to penetrate inside the superconductor at lower external magnetic field value compared to the low temperature baked niobium ones. This explains lower quench field of SRF cavities treated with nitrogen.
Quality factor improvement of fundamental mode forced to analyze the high order mode (HOM) impact on the particle beam dynamics. Both resonant and cumulative effects caused by monopole and dipole HOMs respectively are found to be negligible within the requirements for LCLS--II.
LEADER 03767ntm a22004453i 4500
001 10773337
005 20151222121358.5
007 cr un|---|||||
008 151222s2015 miu||||||m |||||||eng d
003 ICU
020 |a 9781339099002 
035 |a (MiAaPQD)AAI3725569 
035 |a AAI3725569 
040 |a MiAaPQD  |b eng  |c MiAaPQD  |e rda 
100 1 |a Vostrikov, Alexander,  |e author. 
245 1 0 |a Physics and material science of ultra-high quality factor superconducting resonator /  |c Vostrikov, Alexander. 
260 |c 2015. 
264 1 |a Ann Arbor :   |b ProQuest Dissertations & Theses,   |c 2015 
300 |a 1 electronic resource (102 pages) 
336 |a text  |b txt  |2 rdacontent  |0 http://id.loc.gov/vocabulary/contentTypes/txt 
337 |a computer  |b c  |2 rdamedia  |0 http://id.loc.gov/vocabulary/mediaTypes/c 
338 |a online resource  |b cr  |2 rdacarrier  |0 http://id.loc.gov/vocabulary/carriers/cr 
500 |a Advisors: Young-Kee Kim; Alexander Romanenko Committee members: Emil J. Martinec; David Schuster; Steven J. Sibener. 
502 |b Ph.D.  |c The University of Chicago, Division of the Physical Sciences, Department of Physics  |d 2015. 
510 4 |a Dissertation Abstracts International,   |c Volume: 77-02(E), Section: B. 
520 |a The nitrogen doping into niobium superconducting radio frequency cavity walls aiming to improve the fundamental mode quality factor is the subject of the research in the given work. Quantitative nitrogen diffusion into niobium model calculating the concentration profile was developed. The model estimations were confirmed with secondary ion mass spectrometry technique measurements. The model made controlled nitrogen doping recipe optimization possible. As a result the robust reproducible recipe for SRF cavity walls treatment with nitrogen doping was developed. The cavities produced with optimized recipe met LCLS--II requirements on quality factor of 2. · 10 10 at acceleration field of 16~MV/m. 
520 |a The microscopic effects of nitrogen doping on superconducting niobium properties were studied with low energy muon spin rotation technique and magnetometer measurements. No significant effect of nitrogen on the following features was found: electron mean free path, magnetic field penetration depth, and upper and surface critical magnetic fields. It was detected that for nitrogen doped niobium samples magnetic flux starts to penetrate inside the superconductor at lower external magnetic field value compared to the low temperature baked niobium ones. This explains lower quench field of SRF cavities treated with nitrogen. 
520 |a Quality factor improvement of fundamental mode forced to analyze the high order mode (HOM) impact on the particle beam dynamics. Both resonant and cumulative effects caused by monopole and dipole HOMs respectively are found to be negligible within the requirements for LCLS--II. 
546 |a English 
590 |a School code: 0330 
690 |a Materials science. 
690 |a Physics. 
710 2 |a University of Chicago.  |e degree granting institution.  |0 http://id.loc.gov/authorities/names/n79058404  |1 http://viaf.org/viaf/143657677 
720 1 |a Young-Kee Kim  |e degree supervisor. 
720 1 |a Alexander Romanenko  |e degree supervisor. 
856 4 0 |u http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3725569 
903 |a HeVa 
929 |a eresource 
999 f f |i ecc8f1c2-7104-5d6c-b74a-c2907b964345  |s 5934825d-78b3-5fe7-941c-daf578e3ff82 
928 |t Library of Congress classification  |l Online  |c UC-FullText  |u http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3725569  |i 9079564