[논문]Superconducting magnet system of in-flight separator for a heavy ion accelerator planned in Korea

Kim, J.W.; Kim, D.G.; Jo, H.C.; Choi, Y.S.; Kim, S.H.; Sim, K.D.; Sohn, M.H.

doi:10.9714/psac.2015.17.1.028

Superconducting magnet system of in-flight separator for a heavy ion accelerator planned in Korea 원문보기

Progress in superconductivity and cryogenics : PSAC, v.17 no.1, 2015년, pp.28 - 31

Kim, J.W. (Institute for Basic Science) , Kim, D.G. (Institute for Basic Science) , Jo, H.C. (Institute for Basic Science) , Choi, Y.S. (Korea Basic Science Institute) , Kim, S.H. (Changwon National University) , Sim, K.D. (Korea Electrotechnology Research Institute) , Sohn, M.H. (Korea Electrotechnology Research Institute)

Abstract ▼ AI-Helper

An in-flight fragment separator, which aims to produce and study rare isotopes, consists of superferric quadrupole triplets and $30^{\circ}$ dipole magnets to focus and bend the beams for achromatic focusing and momentum dispersion, respectively. The separator is divided into pre and main stages, and we plan to use superconducting magnets employing high-Tc superconductor (HTS) coils in the pre-separator area, where radiation heating is high. The HTS coils will be cooled by cold He gas in 20-50 K, and in the other area, superferric magnets using low-temperature superconductor (LTS) will be used at 4 K. A few LTS coils were wound and successfully tested in a LHe dewar, and the design of cryostat has been optimized. Development of the HTS coils is ongoing in collaboration with a group at KERI. An HTS coil of racetrack shape was wound and tested in a $LN_2$ bath and in a dewar with cryocooler. No degradation on critical current due to coil winding was found.

주제어

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제안 방법

The design of superferric quadrupole was optimized in view of minimizing intrinsic harmonic fields of dodecapole and 20^th pole fields in the full operation range of 5-15 T/m [5]. The location and the shape of the coil were the main optimization parameters.
The test of the prototype is crucial in evaluating the capability of heat removal and quench safety. The radiation heating will be simulated by an array of heaters located around the coil.

대상 데이터

1 mm by four cylindrical pillars and four support bars outside of the yoke. Its mechanical structure is designed to support the total weight of around 10 tons, and the maximum static deflection is calculated to be roughly 0.05 mm.

이론/모형

A heavy ion accelerator complex to produce rare isotope beams for nuclear science users has been designed in Korea [1]. Isotope beams will be produced by using both in-flight fragmentation and isotope on line (ISOL) methods [2].

참고문헌 (7)

J. Kim, "Status of the rare isotope science project in Korea," Proc. of the 26th LINAC Conf., pp. 455-457, 2012.
J. Kim, D. Kim, M. Kim, J. Song, C. Yun, and S. Kim, "Design study of in-flight fragment separator for rare isotope science project in Korea," Proc. of Heavy Ion Accel. Tech., pp. 20-22, 2012.
D. Morrissey, B. Sherrill, "In-flight separation of projectile fragments," Lecture Notes in Physics, vol. 651, Springer-Verlag, Berlin 2004, pp. 113-135.
R. Gupta, M. Anerella, A. Ghosh, J. Schmalzle and W. Sampson, "Design, construction and test results of a warm iron HTS quadrupole for the Facility for Rare Isotope Beams," IEEE Trans. on Appl. Supercond., vol. 18, pp. 236-239, 2008.

상세보기
A. Zaghloul, D. G. Kim, J. Y. Kim, M. J. Kim, M. Kim, C. Yun, J. W. Kim, "Design of large aperture superferric quadrupole magnets for an in-flight fragment separator," AIP Conf. Proc. vol. 1573, pp. 416-421, 2014.
OPERA3D is a product of Cobham PLC.
H. Takeda, T. Kubo, K. Kusaka, H. Suzuki, N. Inabe, J. Nolen, "Extraction of 3D field maps of magnetic multipoles from 2D surface measurements with applications to the optics calculations of the large-acceptance superconducting fragment separator BigRIPS," Nucl. Instru. Methods B, vol. 317, pp. 798-809, 2013.

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