A Study on the Performance of the Cryostat System for the 28-GHz Electron Cyclotron Resonance Ion Source at the Korea Ba
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A Study on the Performance of the Cryostat System for the 28-GHz Electron Cyclotron Resonance Ion Source at the Korea Basic Science Institute Jonggi Hong, Jin Yong Park, Sung Jun Kim and Jung-Woo Ok∗ Busan Center, Korea Basic Science Institute, Busan 46742, Korea
Seyong Choi Department of Electrical Engineering, Kangwon National University, Kangwon 25913, Korea (Received 8 January 2020; revised 23 March 2020; accepted 23 March 2020) The BIBA (Busan Ion Beam Accelerator) is a compact linear accelerator facility using the 28 GHz ECRIS (Electron Cyclotron Resonance Ion Source) at the KBSI (Korea Basic Science Institute). The superconducting magnets of the 28 GHz ECRIS produce high magnetic fields for strong confinement of plasmas in an ion source chamber. For stable operation of the superconducting magnets, performance of cryostat system is very essential. However, the cryostat system produces significant quantities of the heating due to conduction from room temperature. In addition, part of the X-ray radiation produced by the collisions of the electrons within the ion source chamber is absorbed by the cold mass of the superconducting magnet, leading to an additional heat load in the cryostat system. In this paper, a study on the performance of the cryostat system for 28 GHz ECRIS is performed to improve the cooling efficiency of the cryostat system. Keywords: Cryostat, Superconducting magnet, 28 GHz ECRIS, BIBA, Cryocooler, HTS current lead DOI: 10.3938/jkps.77.404
I. INTRODUCTION The BIBA (Busan Ion Beam Accelerator) is a compact linear accelerator facility using the 28 GHz ECRIS (electron cyclotron resonance ion source) at the KBSI (Korea Basic Science Institute). The practical purpose of the BIBA is to produce neutrons and multi-charged heavy ions for new high-tech research. In 2016, a LEBT (low energy beam transport) system and an ion implantation chamber were developed and installed in order to produce multi-charged heavy ions generated from the developed 28 GHz ECRIS. Then, in 2017, we successfully produced multi-charged heavy ions from various gases when 1 kW of microwave power was injected using a 28 GHz gyrotron [1]. After that, in August of 2018, a new hightech research facility at the BIBA was constructed in Busan, South Korea, by the KBSI. Currently, the BIBA is being relocated and installed in a new high-tech research facility. A picture of the new high-tech research facility for the BIBA and a brief schematic drawing of the BIBA are shown in Fig. 1 and Fig. 2, respectively. This paper reports on a study on the performance of the cryostat system for the 28 GHz ECRIS that was performed to improve the cooling efficiency of the cryostat system. The superconducting magnets of the 28 GHz ECRIS produce high magnetic fields (axial magnetic field ∗ E-mail:
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strength of 3.6 T at injection and 2.2 T at extraction and radial field strength of 2.1 T at the plasma chamber wall) for strong confinement of plasmas [2]. For stable operation of the superconducting magnets, the perfor
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