NDLI: Upgrade Design of Pefp 3mev Rfq

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Upgrade Design of Pefp 3mev Rfq

Content Provider	Semantic Scholar
Author	Cho, Yong Sik Jang, J. H. Kim, Young H. Kwon, Hyukjin J. Shim, C. B.
Copyright Year	2004
Abstract	The radial matching section consists of 6 cells for the smooth matching of the RFQ input beam controlled by the last solenoid of LEBT. In order to maintain the RFQ length similar to that of the old design, we have selected the shaper energy as 86.5 keV where the synchronous phase is linearly increased. The PEFP (Proton Engineering Frontier Project) 3 MeV RFQ has been fabricated and tested. Some problems, such as frequency and voltage profile tuning has been found during the experiments. To solve the problems, the upgrade design of 3 MeV RFQ has been decided. The main concept of this upgrade design is constant vane voltage profile with the same length of RFQ. The other parameters (350 MHz, 3 MeV, 20 mA) are the same with the previous RFQ. With constant vane voltage profile, fabrication of RFQ can be easier, and with the same mechanical dimension, other parts such as vacuum pumping station can be re-used. In this paper, the details of beam dynamics design and engineering design will be presented. We have chosen the constant ρ/r0 as 0.87 which limits the surface electric field below the 1.8 Kilpatrick field. The fraction of octupole components becomes less than 10 % of the quadrupole component value under this choice. The last cell of the RFQ is changed to be the transition cell proposed by Crandall [2]. It should eliminate the energy uncertainty at the end of RFQ and gives the same length between the horizontal and vertical vanes. Since it offers well defined ending scheme for RFQ, the additional fringe field region after transition cell can be used for the transverse matching between the RFQ and the following
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://accelconf.web.cern.ch/accelconf/a04/PAPERS/THP21011.PDF
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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