First Results of Testing 3.9 GHz&amp;lt;tex&amp;gt;$rm TM_010$&amp;lt;/tex&amp;gt;Superconducting Cavity

Solyak, N.; Bellantoni, L.; Berenc, Tim; Edwards, H.; Gonin, I.; Khabiboulline, T.

doi:10.1109/tasc.2005.849681

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…9). A similar finding was measured by other groups [8]. One possible explanation is that, at low temperatures, residual resistance dominates compared with BCS resistance.…”

Section: High Gradient Testssupporting

confidence: 89%

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Development of the Superconducting 3.9 GHz Accelerating Cavity at Fermilab

Arkan

Bauer

Bellantoni

et al.

Proceedings of the 2005 Particle Accelerator Conference

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A superconducting third harmonic 3.9 GHz accelerating cavity was proposed to improve the beam quality in the TTF-like photoinjector [1]. Fermilab has developed, built and tested several prototypes, including two copper 9-cell cavities, one niobium 3-cell cavity, and one 9-cell cavity. The helium vessel and frequency tuner for the 9-cell cavity was built and tested as well. In cold tests, we achieved a peak surface magnetic field of ~100mT, well above the 70mT specification. The accelerating gradient was likely limited by thermal breakdown. Studies of the higher order modes in the cavity revealed that the existing cavity design with two HOM couplers will provide sufficient damping of these modes. In this paper we discuss the cavity design, results of the studies and plans for further development.

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“…9). A similar finding was measured by other groups [8]. One possible explanation is that, at low temperatures, residual resistance dominates compared with BCS resistance.…”

Section: High Gradient Testssupporting

confidence: 89%

“…In the first tests of the 3-cell cavity, we achieved a surface resistance of Rs=60nΩ and an accelerating gradient of 12MV/m even without high pressure rinsing [8]. After an additional 5µm etch and ~2hrs HPR in ultra-pure water, the cavity performance improved.…”

Section: High Gradient Testsmentioning

confidence: 98%

Development of the Superconducting 3.9 GHz Accelerating Cavity at Fermilab

Arkan

Bauer

Bellantoni

et al.

Proceedings of the 2005 Particle Accelerator Conference

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“…The power coupler consists of multiple sections in order to meet the strict vacuum and cryogenic requirements of the particle accelerator (FLASH) system. The coupler structure is more sophisticated than the one used in the previously conducted cavity vertical tests [2], [3] which was solely designed for testing purpose. In this paper, for the first time, a power coupler for long-term operation has been implemented for a superconducting cavity to withstand high pulsed power at 3.9 GHz.…”

Section: A Coaxial or Waveguide Power Couplermentioning

confidence: 99%

“…To improve the electron beam quality for a free-electron laser, 1 a 3.9-GHz superconducting cavity has been proposed to work in tandem with a superconducting linear accelerator operating at 1.3 GHz [2], [3]. The combined action of the two accelerators is expected to result in a linear distribution in the phase space for the accelerated particles [4].…”

Section: Introductionmentioning

confidence: 99%

Development and Integration Testing of a Power Coupler for a 3.9-GHz Superconducting Multicell Cavity Resonator

Jianjian

Harms

Höcker

et al. 2011

IEEE Trans. Appl. Supercond.

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A coaxial power coupler for a superconducting multicell cavity resonator at 3.9 GHz has been developed. The cavity is intended to be employed as an accelerator to provide enhanced electron beam quality in a free-electron laser. Due to cryogenic high-vacuum and high-power requirements, special provisions for two windows and two bellows were implemented. A simulation tool was employed to optimize the coupler structure for low reflection of incident power and dissipation while restraining the field at critical locations to prevent material breakdown. The procedures for testing the coupler on its own and integrated with the superconducting cavity are described, and the measurement results are presented. The coupler-cavity assembly was tested to exceed the requirement of 9.3-kW input power and axial field intensity of 14.5 MV/m in the cavity. Coupler return and insertion losses were estimated to be 21 and 0.2 dB, respectively.

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“…A high quality factor means that the cavity will better retain the energy pumped into it which is a desirable outcome from the cavity performance test process. The test thus becomes part of the qualifying process for determining that the SC cavities meet all of the extraordinary needs of the FLASH user facility [61], [62], [63]. Cavity performance test also serves to verify whether the SC cavity preparation procedures are sufficient.…”

Section: Cavity Performance Testmentioning

confidence: 99%

Microwave power coupler for a superconducting multiple-cell cavity for accelerator application and its testing procedures

Jianjian

2008

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First Results of Testing 3.9 GHz<tex>$rm TM_010$</tex>Superconducting Cavity

Cited by 3 publications

References 5 publications

Development of the Superconducting 3.9 GHz Accelerating Cavity at Fermilab

Development of the Superconducting 3.9 GHz Accelerating Cavity at Fermilab

Development and Integration Testing of a Power Coupler for a 3.9-GHz Superconducting Multicell Cavity Resonator

Microwave power coupler for a superconducting multiple-cell cavity for accelerator application and its testing procedures

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