Design and assembly of the QWR and the HWR cryomodules

Kim, Woo Kang; Kim, Heetae; Kim, Hyung Jin; Kim, Youngkwon; Lee, Min Ki; Park, Gunn-Tae

doi:10.3938/jkps.67.1287

Cited by 4 publications

(6 citation statements)

References 2 publications

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“…The RAON accelerator was designed [23], and the cavity was tested with liquid nitrogen [24]. The quarter-wave resonator (QWR) and the half-wave resonator (HWR) cavity were developed [25][26][27][28]. The performance of the quarter-wave resonator (QWR) cavities is tested at the vertical test facility.…”

Section: Methodsmentioning

confidence: 99%

“…The field emission sites of the superconducting cavity were investigated [17][18][19][20], and reducing the outgassing and the RF processing of the pulsed high peak power for the superconducting cavity were used to reduce the field emission in order to achieve a high-quality cavity [21,22]. The RAON accelerator was designed [23], the cavity was tested with liquid nitrogen [24], the quarterwave resonator (QWR) and the half-wave resonator (HWR) were developed [25][26][27][28], and the half-wave resonator (HWR) cryomodule was tested at 2 K [29,30]. The high-beta cavity for the quarter-wave resonator (QWR) was tested [31], and both the electric and magnetic field-dependent surface resistances were studied on a superconducting niobium ac-Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Kim¹,

Jeon²,

Jung³

et al. 2023

Preprint

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The magnetic heating effect for the superconducting quarter-wave resonator (QWR) cavities is investigated, and the Q slopes of the superconducting cavities are measured with an increasing accelerating field. Physical phenomena for zero-temperature limit are introduced. Bardeen–Cooper–Schrieffer (BCS) resistance and Casimir force are calculated for the zero-temperature limit. The vertical test is shown for the performance test of the quarter-wave resonator (QWR) cavities. The parameters for the quarter-wave resonator (QWR) cavity are presented. The Q slopes are measured as a function of an accelerating electric field at 4.2 K. The surface resistance of the superconducting cavity increases with an increasing peak magnetic field. The magnetic defects cause the degradation for the quality factor. From the magnetic degradation, we can find the magnetic moments of the superconducting cavities. All the quarter-wave resonator (QWR) cryomodules are installed in the tunnel, and beam commissioning is performed successfully.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Kim¹,

Jeon²,

Jung³

et al. 2023

Preprint

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show abstract

“…The cavity quality factor is expressed as [31] 𝑄 𝑜 = 𝐺 𝑅 Sur (20) The surface resistance of the superconducting cavity can be expressed as…”

Section: Magnetic Effect In a Superconducting Cavitymentioning

confidence: 99%

“…The field emission sites of the superconducting cavity were investigated [13][14][15]; moreover, reductions in the outgassing and the RF processing of the pulsed high peak power for the superconducting cavity were used to reduce the field emission in order to achieve a high-quality cavity [16,17]. The RAON accelerator was designed [18], the quarter-wave resonator (QWR) and the halfwave resonator (HWR) cryomodule were developed [19,20], and the half-wave resonator (HWR) cryomodule was tested at 2 K [21,22]. The high-beta cavity for the quarter-wave resonator (QWR) was tested [23].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Kim

Jeon

Jung

et al. 2023

QuBS

Self Cite

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In this paper, the magnetic heating effect of the superconducting quarter-wave resonator (QWR) cavities is investigated, and the Q slopes of the superconducting cavities are measured with an increasing accelerating field. Bardeen–Cooper–Schrieffer (BCS) resistance is calculated for the zero-temperature limit. The vertical test is shown for the performance test of the QWR cavities. The parameters for the QWR cavity are presented. The Q slopes are measured as a function of an accelerating electric field at 4.2 K. The surface resistance of the superconducting cavity increases with an increasing peak magnetic field. The magnetic defects degrade the quality factor. From the magnetic degradation, we determine the magnetic moments of the superconducting cavities. All quarter-wave resonator (QWR) cryomodules are installed in the tunnel, and beam commissioning is performed successfully.

show abstract

“…The performance of the superconducting cavities was measured and studied with the field emission effect [4,5]. The performance of the cryomodule was measured with a horizontal test [6][7][8]. The quarter-wave resonator (QWR) and half-wave resonator (HWR) cryomodules are installed in the superconducting linear accelerator 3 (SCL3) site.…”

Section: Introductionmentioning

confidence: 99%

Preparations of QWR superconducting cavities for beam commissioning

Kim,

Jung,

Kim

et al. 2024

J. Phys.: Conf. Ser.

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Quarter-wave resonator (QWR) cavities are prepared for beam commissioning. RF conditioning is performed for each QWR cavity. The total heat load, including static and dynamic heat loads, is measured for each cavity. The helium pressure fluctuation is reduced by changing the flow rate, supply pressure, return pressure, cryogenic valve control, etc. The cavity pressure is monitored during RF preparation. The amplitude and phase of the QWR cavity are stably controlled for beam commissioning.

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Design and assembly of the QWR and the HWR cryomodules

Cited by 4 publications

References 2 publications

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Preparations of QWR superconducting cavities for beam commissioning

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