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Focusing properties of discrete RF quadrupoles

Chinese Physics C 2017年第8期41卷 125-129页

作者：李智慧王志军 The Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan University Institute of Modern Physics Chinese Academy of Sciences

The particle motion equation for a Radio Frequency（RF） quadrupole is derived. The motion equation shows that the general transform matrix of a RF quadrupole with length less than or equal to 0.5βλ（β is the relativistic velocity of particles and λ is wavelength of radio frequency electromagnetic field） can describe the particle motion in an arbitrarily long RF quadrupole. By iterative integration, the general transform matrix of a discrete RF quadrupole is derived from the motion equation. The transform matrix is in form of a power series of focusing parameter B. It shows that for length less than βλ, the series up to the 2ndorder of B agrees well with the direct integration results for B up to 30, while for length less than 0.5βλ, the series up to 1storder is already a good approximation of the real solution for B less than 30. The formula of the transform matrix can be integrated into linac or beam line design code to deal with the focusing of discrete RF quadrupoles.

关键词： RF quadrupole transform matrix focusing parameter iterative integration hybrid rfq

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A new compact structure for a high intensity low-energy heavy-ion accelerator

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Chinese Physics C 2013年第12期37卷 84-87页

作者：王志军何源 A.A.Kolomiets 刘淑会杜晓楠贾欢李超王旺生陈熙萌 Institute of Modern Physics Chinese Academy of Sciences School of Nuclear Science and Technology Lanzhou University University of Chinese Academy of Sciences Institute for Theoretical and Experimental Physics

A new compact accelerating structure named hybrid rfq is proposed to accelerate a high-intensity low-energy heavy ion beam in HISCL （High Intensive heavy ion SuperConducting Linear accelerator）, which is an injector of HIAF （Heavy Ion Advanced Research Facility）. It is combined by an alternative series of acceleration gaps and rfq sections. The proposed structure has a high accelerating ability compared with a conventional rfq and is more compact than traditional DTLs. A hybrid rfq is designed to accelerate 238U34＋ from 0.38 MeV/u to 1.33 MeV/u. The operation frequency is described to be 81.25 MHz at CW （continuous wave） mode. The design beam current is 1.0 mA. The results of beam dynamics and RF simulation of the hybrid rfq show that the structure has a good performance at the energy range for ion acceleration. The emittance growth is less than 5% in both directions and the RF power is less than 150 kW. In this paper, the results of beam dynamics and RF simulation of the hybrid rfq are presented.

关键词： hybrid rfq high intensity heavy ion linac compact structure

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