CW Operation of the TTF-III Input Coupler

Knobloch, Jens; Anders, W.; Martin, M.; Bauer, Svend‐Marian; Pekeler, M.; Belomestnykh, S.; Kostin, D.; Möller, W.-D.; Büchner, A.; Büttig, H.; Gabriel, Frank; Rossendorf, FZ

doi:10.1109/pac.2005.1591445

Cited by 6 publications

(7 citation statements)

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“…However, this coupler, as noted above, was only designed for an average power of ~ 3 kW. The limited power-handling capability, due to excessive heating, was confirmed in tests, first at Rossendorf and then at BESSY, where this coupler is under consideration for the BESSY Free Electron Laser [9]. The Cornell group has made a number of revisions to the TTF-III coupler to reduce its thermal losses.…”

Section: Continuous Wave Couplersmentioning

confidence: 98%

The design and performance of CW and pulsed power couplers—A review

Garvey

2006

Physica C: Superconductivity

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The design of input power couplers represents one of the most important challenges of accelerators that use super-conducting RF technology. These devices must fulfil several functions while being subject to mechanical, electromagnetic, vacuum and cryogenic constraints. The rapidly increasing number of projects, planned or under construction, which propose to use super-conducting cavities has prompted developments in power couplers for both CW and pulsed applications. Amongst the projects for which couplers have, or are being, developed one finds VUV and X-ray free electron lasers (based on self-amplified spontaneous emission), spallation neutron sources (SNS), energy recovery linacs, and high energy colliders. We will review the design requirements and performances obtained for several of these couplers. Particular attention will be paid to the couplers which have been used on the TESLA Test Facility at DESY, the variations of this coupler which are under consideration for future synchrotron light sources and the coupler chosen for use on the SNS. AbstractThe design of input power couplers represents one of the most important challenges of accelerators that use super-conducting RF technology. These devices must fulfil several functions while being subject to mechanical, electromagnetic, vacuum and cryogenic constraints. The rapidly increasing number of projects, planned or under construction, which propose to use super-conducting cavities has prompted developments in power couplers for both CW and pulsed applications. Amongst the projects for which couplers have, or are being, developed one finds VUV and X-ray free electron lasers (based on selfamplified spontaneous emission), spallation neutron sources (SNS), energy recovery linacs, and high energy colliders. We will review the design requirements and performances obtained for several of these couplers. Particular attention will be paid to the couplers which have been used on the TESLA Test Facility at DESY, the variations of this coupler which are under consideration for future synchrotron light sources and the coupler chosen for use on the SNS.

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Section: Continuous Wave Couplersmentioning

confidence: 98%

The design and performance of CW and pulsed power couplers—A review

Garvey

2006

Physica C: Superconductivity

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“…Figure 4 shows the S-parameter curves for the optimized test bench in the 1. 25 The errors introduced from the fabrication and installation of the FPCs will lead to the deterioration of transmission matching. A simple and feasible method is to adjust the insertion depth of the antennas to achieve a new matching.…”

Section: Rf Design Of 13 Ghz Fpc Test Benchmentioning

confidence: 99%

“…To minimize risks to the project, the most critical components and technical solutions are tested in the cryomodule under conditions approximating the final CM configuration [25,26]. In this cryogenic test, eight 1.3 GHz superconducting cavities that were previously qualified in a vertical cryostat were fully assembled with all components (FPCs, magnetic shielding, feed-throughs, and tuners) in the cryomodule [27].…”

Section: High Rf Power Conditioning and Operation In Cryomodulementioning

confidence: 99%

High RF power tests of the first 1.3 GHz fundamental power coupler prototypes for the SHINE project

Shen

Liu

et al. 2022

NUCL SCI TECH

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The Shanghai High Repetition Rate XFEL and Extreme Light Facility (SHINE) project will use 600 1.3 GHz fundamental power couplers, which are modified based on TTF-III power couplers, for continuous-wave operation with input power up to approximately 7 kW. The first batch of 20 sets of 1.3 GHz coupler prototypes was fabricated from three domestic manufacturers for the SHINE project. To better characterize the radio frequency conditioning phenomena for validating the performance of power couplers, a room temperature test stand was designed, constructed, and commissioned for the SHINE 1.3 GHz power couplers. In addition, a horizontal test cryostat was built to test the 1.3 GHz superconducting cavities, fundamental power couplers, tuners, and other components as a set. The results of these tests indicate that the 1.3 GHz couplers are capable of handling up to 14 kW continuous waves. Herein, the main aspects of the radio frequency design and construction of the test stand, along with the test results of the high-power conditioning of the 1.3 GHz couplers, are described.

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“…To confirm the suitability for CW operation, BESSY has already worked on an intensive qualification program. Tests of RF couplers [5] and tuners [6] as well as studies, such as the optimum bath temperature required for reliable and economic CW operation, have been performed. The Horizontal Bi-Cavity Test facility [7] has been set up for this purpose.…”

Section: Accelerationmentioning

confidence: 99%

STARS - a two-stage high-gain harmonic generation FEL demonstrator

Abo-Bakr¹,

Anders²,

Bahrdt³

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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BESSY is proposing a demonstration facility, called STARS, for a two-stage high-gain harmonic generation free electron laser (HGHG FEL). STARS is planned for lasing in the wavelength range 40 to 70 nm, requiring a beam energy of 325 MeV and peak current of 500 A. The facility consists of a normal conducting gun, three superconducting TESLA-type acceleration modules modified for CW operation, a single stage bunch compressor and finally a two-stage HGHG cascaded FEL. This paper describes the faciliy layout and the rationale behind the operation parameters.

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CW Operation of the TTF-III Input Coupler

Cited by 6 publications

References 0 publications

The design and performance of CW and pulsed power couplers—A review

The design and performance of CW and pulsed power couplers—A review

High RF power tests of the first 1.3 GHz fundamental power coupler prototypes for the SHINE project

STARS - a two-stage high-gain harmonic generation FEL demonstrator

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