Conference Paper

Status and Test Results of HPRF System for PEFP

PEFP, KAERI, Daejeon, Korea,
DOI: 10.1109/PAC.2005.1590737 Conference: Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Source: IEEE Xplore

ABSTRACT The PEFP 20MeV proton accelerator is composed of 3 MeV RFQ and 20MeV DTL and two sets of 1 MW, 350 MHz RF system are required for each accelerating structure. The high power RF system for 3 MeV RFQ was already installed and operated to drive the RFQ. The klystron was tested up to 600 kW itself and operated in pulse routinely. The HPRF system for 20 MeV DTL which consists of 4 tanks was installed, and the RF test for 4 tanks has been carried out. Four RF dummy loads for absorbing RF power reflected from each accelerating structure were designed and manufactured. In this paper, the status and test results of the RF system for 20 MeV proton accelerator are discussed.

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    ABSTRACT: A conventional 20 MeV drift tube linac (DTL) for the Proton Engineering Frontier Project (PEFP) has been developed as a low energy section of 100 MeV accelerator. The machine consists of four tanks with 152 cells supplied with 900 kW RF power from 350 MHz klystron through the ridge-loaded waveguide coupler. We assembled the fabricated accelerator components and aligned each part with care. We have also prepared the subsystems for the test of the DTL such as RF power delivery system, high voltage DC power supply, vacuum system, cooling system, measurements and control system and so on. The detailed description of the initial test setup and preliminary test results will be given in this paper.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: A 100 MeV proton accelerator is under development for the Proton Engineering Frontier Project (PEFP). The goal of the first stage of the project is to develop a 20MeV accelerator and the initial test of the 20 MeV accelerator will be made. The DTL of 20 MeV accelerator consists of four tanks and will be driven with single klystron, which gives rise to some unique problems with regard to the way of independent resonance control for each tank. Some changes made in the LLRF for reducing phase or amplitude error of cavities affect all of four tanks simultaneously, for which it is not possible to use LLRF for individual control of phase and amplitude of each tank. For independent control of each tank, we are going to use the temperature control of the drift tubes as a frequency tuner. During the initial test of the DTL, the phase of each tank will be synchronized with the first tank phase, and beam based test will be performed as if all of tanks were single unit. The detailed description of the test scheme and the analysis results will be given in this paper.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: The PEFP (Proton Engineering Frontier Project) 20 MeV linear accelerator is composed of a 3 MeV RFQ and 20 MeV DTL. Two sets of 1 MW, 350 MHz RF systems drive the RFQ and DTL. The RF system can perform a 100 % duty operation. The TH2089F klystron is used as an RF source. During the test operation, only the driving RF signal of the klystron was operated in pulse mode, while the electron beam was maintained in DC mode. The klystron power supplies and cooling systems were also operated in 100 % duty mode. In this paper, we will discuss the operation results of 1 MW RF systems including klystron power supply and cooling system, and propose possible options to improve the operation conditions based on the results.

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