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Vertical Test of a Half-Wave Resonator at the Rare Isotope Science Project
Gunn Tae Park,Jongdae Joo,Zhongyuan Yao 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
A vertical test of the β = 0.12 half-wave resonator prototype at the Rare Isotope Science Project (RISP) was done at TRIUMF, Canada. The design goal of Q0 = 1.9 × 109 at an accelerating gradient of Eacc = 6.3 MV/m at 2 K was achieved. Moreover, the residual resistance, the sensitivity against helium pressure fluctuations, and the Lorentz force detuning were also measured. The performance was limited by field emission at around Eacc = 8.1 MV/m. In addition to the vertical test result, the surface processing is described in this paper.
Vacuum Test of Cavity with Liquid Nitrogen
Choi, Suk,Park, Gunn-Tae,Kim, Heetae The Korean Vacuum Society 2015 Applied Science and Convergence Technology Vol.24 No.5
Schematic of RAON vacuum system is introduced. Vacuum test for superconducting cavity with liquid nitrogen is performed. Schematic plan for RAON vacuum system is introduced and vacuum control system for superconducting cavity test is constructed. Vacuum pressure of cavity is shown as a function of pumping time. The temperature of cavity is shown as a function of cooling time. Outgassing species from cavity is also detected. Detailed experimental procedure is presented to test the cavity vacuum with liquid nitrogen.
Vacuum Test of Cavity with Liquid Nitrogen
Suk Choi,Gunn-Tae Park,Heetae Kim 한국진공학회(ASCT) 2015 Applied Science and Convergence Technology Vol.24 No.5
Schematic of RAON vacuum system is introduced. Vacuum test for superconducting cavity with liquid nitrogen is performed. Schematic plan for RAON vacuum system is introduced and vacuum control system for superconducting cavity test is constructed. Vacuum pressure of cavity is shown as a function of pumping time. The temperature of cavity is shown as a function of cooling time. Outgassing species from cavity is also detected. Detailed experimental procedure is presented to test the cavity vacuum with liquid nitrogen.
Low Temperature Test of HWR Cryomodule
Heetae Kim,Youngkwon Kim,Min Ki Lee,Gunn-Tae Park,Wookang Kim 한국진공학회(ASCT) 2016 Applied Science and Convergence Technology Vol.25 No.3
Low temperature test for half-wave resonator (HWR) cryomodule is performed at the superfluid helium temperature of 2 K. The effective temperature is defined for non-uniform temperature distribution. Helium leak detection techniques are introduced for cryogenic system. Experimental set up is shown to make the low temperature test for the HWR cryomodule. The cooldown procedure of the HWR cryomodule is shown from room temperature to 2 K. The cryomodules is precooled with liquid nitrogen and then liquid helium is supplied to the helium reservoirs and cavities. The pressure of cavity and chamber are monitored as a function of time. The vacuum pressure of the cryomodule is not increased at 2 K, which shows leak-tight in the superfluid helium environment. Static heat load is also measured for the cryomodule at 2.5 K.
Low Temperature Test of HWR Cryomodule
Kim, Heetae,Kim, Youngkwon,Lee, Min Ki,Park, Gunn-Tae,Kim, Wookang The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.3
Low temperature test for half-wave resonator (HWR) cryomodule is performed at the superfluid helium temperature of 2 K. The effective temperature is defined for non-uniform temperature distribution. Helium leak detection techniques are introduced for cryogenic system. Experimental set up is shown to make the low temperature test for the HWR cryomodule. The cooldown procedure of the HWR cryomodule is shown from room temperature to 2 K. The cryomodules is precooled with liquid nitrogen and then liquid helium is supplied to the helium reservoirs and cavities. The pressure of cavity and chamber are monitored as a function of time. The vacuum pressure of the cryomodule is not increased at 2 K, which shows leak-tight in the superfluid helium environment. Static heat load is also measured for the cryomodule at 2.5 K.