Machine Imperfection Studies of the RAON Superconducting Linac

Jeon, D.; Jang, Jiho; Jin, Hyunchang

doi:10.3938/jkps.72.1005

Cited by 4 publications

(3 citation statements)

References 3 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].…”

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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“…As the construction of the RAON accelerator progresses, the beam commissioning has been also conducted from the injector section since 2020. For the successful beam commissioning, various beam dynamics researches have been carried out with machine errors [5][6][7], and several physics application tools have been also developed in connection with the control system [8]. During the beam commissioning, the orbit correction based on the singular value decomposition (SVD) method [9] was carried out to prevent the beam loss and to improve the beam transmission at the LEBT section [10] and the MEBT section [11].…”

Section: Introductionmentioning

confidence: 99%

Beam test results of the orbit correction at the low-energy superconducting accelerator section in the RAON accelerator

Jin,

Jang,

Jeon

2024

J. Inst.

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The RAON accelerator has been constructed for various science programs with stable ions and rare isotopes since 2011. After the installation of the injector section was completed in 2020, the low-energy superconducting accelerator (SCL3) section was also installed consecutively until 2022, and the beam commissioning using an argon beam is in progress from the injector section to the SCL3 section. For successful beam commissioning, various beam dynamics studies have been carried out, and the research of the orbit correction has been also conducted to determine the location and the number of steering magnets and BPMs for safe and efficient beam operation. In the SCL3 section, the orbit correction simulation was carried out as varying the number of steering magnets for the consideration of the correction of distorted beam orbit and the economic benefits, and then the beam test was carried out based on the simulation results during the beam commissioning. Here we will present the results of simulations and experiments for the orbit correction at the SCL3 section in the RAON accelerator.

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