| Paper | Title | Page |
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| TUPMA119 | Beam Line Design for PEFP User Facility | 271 |
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| In the Proton Engineering Frontier Project (PEFP), 20MeV and 100MeV proton beams from a 100MeV proton liner accelerator will be supplied to users for beam applications. The basic lattice for beam transport line will be FODO from the linac to the targets. Dipole magnets exited with shaped AC currents will distribute the beam from the linac to five targets simultaneously. To provide flexibilities of irradiation conditions for users from many application fields, we design beam lines to the targets with wide or focused, external or in-vacuum, and horizontal or vertical beams. The details of the beam line design will be reported. | ||
| WEZMA03 | High Power Proton Accelerator in Korea | 315 |
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| A high power proton accelerator project, Proton Engineering Frontier Project (PEFP), as one of the 21C Frontier Projects conducted by Korean Government, has goals to develop a 100MeV high current proton linear accelerator, its beam utilization and industrial applications. As the front end of the 100MeV accelerator, a 20MeV linear accelerator consisted of a 50 keV proton injector, a 3 MeV RFQ, a 20 MeV DTL, was completed and tested. The rest part of the accelerator and various beam lines for beam utilizations are under construction, and also a site preparation and construction works are under progresses in cooperation with Gyeongju city. In parallel proton beam utilization and accelerator application technologies are extensively studied and under development. In this paper the status and the future plan of the project including test results of the 20MeV accelerator, site preparation and construction works, and development of proton beam utilization and user program will be presented in detail. | ||
| WEPMA119 | Control Characteristics of the PEFP RF System | 485 |
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| A 20 MeV proton accelerator has been developed and tested at Proton Engineering Frontier Project (PEFP) as a front-end part of the 100 MeV accelerator. The initial test results showed that more stable rf operation was necessary to investigate the machine characteristics more deeply. A LLRF control system using commercially available digital board was newly developed and tested for this purpose. The goals of the rf control for 20 MeV accelerator are to achieve errors within 1 % in amplitude and 1 degree in phase against external perturbations such as the change of resonant frequency, fluctuation of klystron power supply voltage and also beam loading. In addition, the PEFP 20 MeV DTL has unique characteristics that single klystron drives four tanks simultaneously. In this paper, the initial test results of the rf system with digital controller are presented and its control characteristics are discussed. | ||
| WEPMA120 | Development of the Digital RF Control System for the PEFP Proton Accelerator | 488 |
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| The low level RF system is under development for the PEFP Proton Accelerator. The RF amplitude and phase stability requirements of the LLRF system are ±1% and ±1°, respectively. As a prototype of the LLRF, a simple digital PI control system based on commercial FPGA board is designed and tested. The main features are a sampling rate of 40 MHz which is four times higher than the down-converted cavity signal frequency, digital in-phase and quadrature detection, pulsed mode operation with the external trigger, and a simple proportional-integral feedback algorithm. The control logic is implemented in the Xilinx FPGA by using VHDL coding and the application program based on the VxWorks and VME platform is also developed. In this paper, the detailed design study and the test results of the prototype LLRF system are presented. | ||
| WEPMA135 | Mechanical Analysis and Design of the PEFP Low Beta Cavity | 506 |
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Proton Engineering Frontier Project (PEFP) Linac employs the superconducting RF cavity of β=0.42 to accelerate the proton beam with repetition rate of 60 Hz. In order to control the Lorentz force detuning effect, a stiffening structure with double rings and cones is designed for PEFP low beta cavities. This stiffening structure can reduce Lorentz force detuning coefficient to be lower than 1 Hz/(MV/m)2. The cavity’s mechanical modes are calculated by using ANSYS 2-D model and 3-D model. The calculation results demonstrate that PEFP Low Beta Cavity has no dangerous mechanical modes for 60 Hz pulse repetition. The mechanical stability of the SRF cavity is analyzed under the atmosphere pressure after being pumped down and under the helium liquid pressure after being cooled down.
*This work is supported by the 21C Frontier R&D program in the Ministry of Science and Technology of the Korean government. |
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| THC2MA01 | Design of The PEFP Low Beta Cryomodule | 564 |
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A low beta elliptical superconducting RF (SRF) cavity has been designed for the linac of Proton Engineering Frontier Project (PEFP). A double stiffening-ring structure is designed to reduce cyclic Lorentz force detuning of the PEFP low beta cavity. HOM analysis has shown, for the PEFP low beta cavities, the HOM coupler’s Qext needs to be lower than 3·10+5 for reducing influence of the dangerous modes on the beam instabilities and HOM-induced power. A coaxial coupler with two stubs, one hook and the coupling tip directly installed on the inner conductor is designed for PEFP cryomodules. The cooling system including is designed for the PEFP cryomodules. A magnetic shielding structures shaped by two coaxial cylinders is designed for the PEFP low beta cryomodules.
*This work is supported by the 21C Frontier R&D program in the Ministry of Science and Technology of the Korean government. |
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