Accelerator complex for the joint project of KEK/JHF and JAERI/NSP

Abstract

The JHF of KEK and the NSP of JAERI were joined to form one project in order to more effectively promote a wide range of scientific and engineering fields included in either of the projects. The Joint Project is divided into two phases. Phase I comprises a 400-MeV linac, a 3-GeV, 1-MW rapid-cycling synchrotron and a 50-GeV synchrotron. Phase II is the upgraded system, which includes a several-MW pulsed spallation neutron source. The high-energy linac of the Phase I will be a superconducting one, in order to develop one of the most crucial accelerator techniques for realizing an acceleratordriven nuclear waste transmutation system. The R&D results accomplished for the Joint Project are highlighted.

First high-power model of the annular-ring coupled structure for use in the Japan Proton Accelerator Research Complex linac

“…If all the frequency deviations for the accelerating and coupling cells are given by Áf a and Áf c , respectively, the coupled-resonator model [12] provides us with the following relation [13]:…”

“…In particular, the latter is important for realizing a stable operation as well as short conditioning time. These are the main reasons for our developing an ACS for the Japan Proton Accelerator Research Complex (J-PARC) [6] linac. On the other hand, it is difficult to tune the acceleratingcell frequency of the ACS after assembling, which is in contrast to the case of SCS.…”

Synchrotron RF system for the JAERI-KEK Joint Project

“…The advantage of the scheme is that the shunt impedance is constant for the wide range of Q value (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). The optimum Q value is between 10 and 20 for the 50 GeV Synchrotron to reduce the transient beam loading and bucket distortion effects, and to sweep the rf frequency without any tuning.…”

“…The accelerator complex of the JAERI-KEK Joint Project [1,2] consists of a 400 MeV linac, 3 GeV and 50 GeV Synchrotrons. The accelerators provide high intensity proton beams for high-energy physics, solid state physics, biology and other fields.…”

The present status of the JAERI/KEK joint project for high-intensity proton accelerators

“…The phase I of high-intensity proton accelerator facility project in Japan [1][2][3][4] was approved for the construction starting from April, 2001. The Phase I will be completed by March, 2007.…”