Improvement of cavity performance by electropolishing in the 1.3 GHz Nb superconducting cavities

Kako, E.; Noguchi, S.; Ono, Masaaki; Saito, Kenji; Shishido, T.; Aune, B.; Charrier, J.P.; Juillard, Michel; Safa, H.

doi:10.1109/pac.1999.795725

Cited by 7 publications

(12 citation statements)

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“…From the accelerator viewpoint regarding ADS, the high-energy part of the 400-MeV linac will use SC accelerating cavities, which can be a prototype of the future CW accelerator for ADS use. The development work for the SC proton linac has been performed at JAERI [8][9][10] in collaboration with the SC linear collider group at KEK [15] as described in Sec. 3.3.…”

Section: Accelerator Scheme Of Joint Project and Its Usagementioning

confidence: 99%

“…The SC cavities for the proton linac have been intensively developed by the JAERI/NSP group [10] in close collaboration with the SC linear collider group [15] in KEK. Among various accomplishments of this R&D program, it is emphasized that the world-highest accelerating field gradient of 8.8 MV/m (the maximum surface field of 44 MV/m) has been obtained for a β = 0.5 structure [10].…”

Section: High-energy Linacmentioning

confidence: 99%

“…Among various accomplishments of this R&D program, it is emphasized that the world-highest accelerating field gradient of 8.8 MV/m (the maximum surface field of 44 MV/m) has been obtained for a β = 0.5 structure [10]. In particular, the electropolishing technique [15] developed and mass-used for the KEK/TRISTAN was fully utilized for this accomplishment.…”

Section: High-energy Linacmentioning

confidence: 99%

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Accelerator complex for the joint project of KEK/JHF and JAERI/NSP

Yamazaki

Mizumoto

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The JHF of KEK and the NSP of JAERI were joined to form one project in order to more effectively promote a wide range of scientific and engineering fields included in either of the projects. The Joint Project is divided into two phases. Phase I comprises a 400-MeV linac, a 3-GeV, 1-MW rapid-cycling synchrotron and a 50-GeV synchrotron. Phase II is the upgraded system, which includes a several-MW pulsed spallation neutron source. The high-energy linac of the Phase I will be a superconducting one, in order to develop one of the most crucial accelerator techniques for realizing an acceleratordriven nuclear waste transmutation system. The R&D results accomplished for the Joint Project are highlighted.

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Section: Accelerator Scheme Of Joint Project and Its Usagementioning

confidence: 99%

Section: High-energy Linacmentioning

confidence: 99%

Section: High-energy Linacmentioning

confidence: 99%

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Accelerator complex for the joint project of KEK/JHF and JAERI/NSP

Yamazaki

Mizumoto

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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“…In a collaboration between Saclay and KEK it was shown that electropolishing of the surface reduces this Q-drop and enhances the high-field capability compared to a buffered chemical polished surface [14]. An R&D effort has been launched in collaboration with CERN, KEK, Saclay and an industrial company to apply electropolishing to the 9-cell TESLA structures.…”

Section: Future Cavity Randdmentioning

confidence: 99%

Experience with superconducting cavity operation in the TESLA Test Facility

Pekeler

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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A description of the TESLA Test Facility, which has been set up at DESY by the TESLA Collaboration, will be given. Measurements of the superconducting 9-cell cavities in vertical and horizontal test cryostats will be presented, as well as the experience with the first two accelerator modules in the TTF linac. Future cavity R&D efforts will be described. INTRODUCTIONA linear e + e , collider with a center-of-mass energy of ऋ 500 GeV would be an ideal machine to search for further fundamental constituents of matter and their interactions and to address the problem of mass generation in the Standard Model. Among the different designs (NLC, JLC, VLEPP, CLIC & TESLA), TESLA is the only one using superconducting cavities and a low radio frequency of 1.3 GHz. The high conversion efficiency from primary to beam power and the small emittance dilution makes the superconducting version an ideal choice for high luminosity operation [1]. The TESLA 500 GeV collider design is based on nine-cell cavities with a gradient of 25 MV/m at a quality factor Q of more than 5 ࣽ 10 9 [2]. An important feature is the integrated X ray Free Electron Laser (FEL) working on the Self-Amplified Spontaneous Emission (SASE) principle. This FEL will produce a photon beam at Angstrom wavelengths with peak brilliance exceeding that of third generation synchrotron radiation sources by 10 orders of magnitude. aim was to achieve gradients of 15 MV/m in a first step and to gradually approach the 25 MV/m design gradient of the linear collider. THE TESLA TEST FACILITY

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“…Previous RF measurements performed on indium and tin samples and the corresponding theoretical estimation have shown that B s ≥ B c might be reached [1]. Moreover, the fundamental limit B sh of bulk Nb is now close to being reached [2]. Due to lack of sufficient experimental data on B sh for Nb, it is important to measure this parameter precisely.…”

Section: Introductionmentioning

confidence: 99%

RF pulsed tests on 3 GHz niobium cavities

Duff¹,

Thomas

Bienvenu³

et al.

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The achievable limiting RF field for S-Band and L-Band superconducting cavities is still an open question today. Previous studies on Sn and In have shown that a surface magnetic field B s higher than the thermodynamical critical field B c might be reached. The ultimate limiting field is then the superheating field B sh (B sh = 240 mT or E acc = 60 MV/m for Nb at T= 0 K). However, the maximum accelerating field observed so far is in the range E acc = 37-40 MV/m for the best 1.3 GHz Nb cavities. A dedicated facility (NEPAL Supra Test Facilty) is currenly used at LAL for measuring B sh on bulk Nb 3 GHz cavities supplied by INFN-Genova. High power pulses (4.5 µs, up to 5 MW) are used to reach B sh before cavity thermal breakdown occurs. A method for analyzing the response of a SRF cavity when subjected to pulsed high RF power was developed and the corresponding numerical simulation results were validated by comparison to experimental data. This technique is successfully applied to detect E acc and B sh at which the cavity magnetic breakdown occurs. Magnetic penetration depth (λ) measurements were also performed with a low RF level test bed and the corresponding data analyzed then compared to theoretical predictions.

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Improvement of cavity performance by electropolishing in the 1.3 GHz Nb superconducting cavities

Cited by 7 publications

References 1 publication

Accelerator complex for the joint project of KEK/JHF and JAERI/NSP

Accelerator complex for the joint project of KEK/JHF and JAERI/NSP

Experience with superconducting cavity operation in the TESLA Test Facility

RF pulsed tests on 3 GHz niobium cavities

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