Prototypes Fabrication of 1.3 GHz Superconducting Rf Components for SHINE

Hou, Hong Tao; Chen, Jinfang; He, Feisi; Ma, Zengwei; Quan, Shengwen; Shi, Jing; Wang, Yan

doi:10.18429/jacow-srf2019-mop049

Cited by 4 publications

(3 citation statements)

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“…( 1)- (3) and are related to some parameters, such as the coupling coefficient b, beam current I b , cavity intrinsic quality factor Q 0 , cavity voltage V c , R/Q of the cavity, frequency detuning df, and resonant frequency f 0 [13]. For the SHINE project, the optimal Q ext of the 1.3 GHz superconducting cavities is 4.12 9 10 7 , under the following working conditions: the average linac beam current is 0.3 mA, the nominal accelerating gradient E acc of the 1.3 GHz superconducting cavity is 16.0 MV/m, the cavity intrinsic quality factor Q 0 is 2.7 9 10 10 , and the frequency detuning df caused by the peak microphonics effect is 10 Hz [14,15]. The required input power from a solid-state amplifier (SSA) for maintaining the operating gradient is approximately 6.6 kW, considering a waveguide transmission loss of 15%.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…To reduce the construction and operating costs of large superconducting radio frequency (SRF) accelerating facilities [1][2][3], several surface treatments including standard surface treatment methods [4][5][6], nitrogen doping [7][8][9] and nitrogen infusion [10,11] have been investigated with 1.3 GHz superconducting cavities to obtain a high accelerating gradient of High Energy Physics [14,15] and the Thomas Jefferson National Accelerator Facility [16]. These baking recipes were first tested on 1.3 GHz single-cell cavities, and then successfully repeated on 1.3 GHz nine-cell cavities.…”

Section: Introductionmentioning

confidence: 99%

Surface resistance effects of medium temperature baking of buffered chemical polished 1.3 GHz nine-cell large-grain cavities

Yang¹,

Hao²,

Quan³

et al. 2022

Supercond. Sci. Technol.

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Three 1.3 GHz 9-cell large grain superconducting niobium cavities were experimented with the proposal of medium temperature baking, using buffered chemical polishing to remove the previous heat treatment impurity profiles. 2 K vertical tests of the cavities gave the average intrinsic quality factor of 2.7×1010 at 16 MV/m, as well as the maximum accelerating gradients of 20-22 MV/m. These promising values confirmed the effectiveness of an improved medium temperature baking recipe for niobium cavities which have been benefitting the superconducting radiofrequency community. Furthermore, the resistance analysis demonstrated that medium temperature baking reduced both the BCS resistance and the residual resistance of the cavities. Impurity analysis on niobium samples provided some proof that the former reduction was due to the shortened electron mean free path, while the later reduction was probably correlated with the mitigation of the increased interstitial impurity atoms.

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“…Recently, superconducting radio-frequency (SRF) cavities have been adopted in many accelerators worldwide [1][2][3][4][5]. To * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Medium-temperature furnace baking of 1.3 GHz 9-cell superconducting cavities at IHEP

Pan

Sha

et al. 2021

Supercond. Sci. Technol.

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Recently, heat treatment between 250 °C and 500 °C has been attempted to improve quality factor (Q) of superconducting radio-frequency cavities at FNAL and KEK. Experiments of such medium temperature (mid-T) bake with furnaces have also been carried out at IHEP. Firstly, over ten 1.3 GHz 1-cell cavities were treated with different temperatures at a small furnace, which all demonstrated improvement of Q and anti-Q-slope phenomenon. The average quality factor has reached 3.6×10 10 when the gradient is 16 MV/m，while the highest Q is 4.9×10 10 @16MV/m; the maximum gradients of these 1-cell cavities are between 25.1 and 36.9 MV/m. Then, the recipe of mid-T furnace bake at 300 °C for 3 hours has been applied to six 1.3 GHz 9-cell cavities at a new big furnace, which have all shown higher Q and anti-Q-slope at medium field (16~24 MV/m). The average quality factor has reached 3.8×10 10 when the gradient is 16 MV/m. The maximum gradients of the 9-cell cavities are between 22.7 and 26.5 MV/m.

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Prototypes Fabrication of 1.3 GHz Superconducting Rf Components for SHINE

Cited by 4 publications

References 0 publications

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

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

Surface resistance effects of medium temperature baking of buffered chemical polished 1.3 GHz nine-cell large-grain cavities

Medium-temperature furnace baking of 1.3 GHz 9-cell superconducting cavities at IHEP

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