IPAC2017 - List of Authors (Kuanjun, K.J.)

Paper	Title	Page
MOPIK033	The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC	573
	T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto KEK, Ibaraki, Japan K.J. Kuanjun HUST, Wuhan, People's Republic of China
	The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK033
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THPAB035	Central Region Design of the Hust SCC250 Superconducting Cyclotron	3778
	L.X.F. Li Private Address, Wuhan, People's Republic of China K.J. Kuanjun, M.Z. Mei, Z.J. Zeng, L.G. Zhang HUST, Wuhan, People's Republic of China
	Recently, the development of a 250 MeV cyclotron for advanced cancer therapy has been carried out by Huazhong University of Science and Technology(HUST) . It has four sector magnet and RF cavity which resonance frequency is 74.69 MHz. The internal ion source was adopted and the central region was designed to accommodate the starting beam. In this paper, the design of the central region to optimize the initial circumstances for H¬+ beam were described. The electric and magnetic field distribution were designed by electrostatic and magnetic solver in OPERA-3D TOSCA. The beam characteristics including the beam orbit, motion of the center of orbit, energy gain was investigated for central region was simulated by means of computer code Z3CYCLONE.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB035
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Paper

Title

Page

The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC

573

T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
KEK, Ibaraki, Japan
K.J. Kuanjun
HUST, Wuhan, People's Republic of China

The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK033

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB035

Central Region Design of the Hust SCC250 Superconducting Cyclotron

3778

L.X.F. Li
Private Address, Wuhan, People's Republic of China
K.J. Kuanjun, M.Z. Mei, Z.J. Zeng, L.G. Zhang
HUST, Wuhan, People's Republic of China

Recently, the development of a 250 MeV cyclotron for advanced cancer therapy has been carried out by Huazhong University of Science and Technology(HUST) . It has four sector magnet and RF cavity which resonance frequency is 74.69 MHz. The internal ion source was adopted and the central region was designed to accommodate the starting beam. In this paper, the design of the central region to optimize the initial circumstances for H¬+ beam were described. The electric and magnetic field distribution were designed by electrostatic and magnetic solver in OPERA-3D TOSCA. The beam characteristics including the beam orbit, motion of the center of orbit, energy gain was investigated for central region was simulated by means of computer code Z3CYCLONE.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB035

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)