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• W2557247514 abstract "INTRODUCTION A new 3-GeV, 500-mA, synchrotron light source named Taiwan Photon Source (TPS) at National Synchrotron Radiation Research Centre (NSRRC) is now entering its final stage of construction with partial occupancy of accelerator components. The commissioning of a new concentric machine is scheduled for 2014 summer. Similarly to its companion low-energy operational synchrotron light source, Taiwan Light Source (TLS), the SRF modules have been selected as accelerating cavities for the storage ring of TPS. The design features of the RF systems for the accelerator complex of TPS are described elsewhere [1]. The beam power consumption for the TPS storage ring will exceed 600 kW at its design beam current 500 mA after the machine is fully occupied with the insertion devices. How to operate the SRF modules highly reliably on consumption of such huge RF power but with an optimal amount of total RF gap voltage from 2.8 MV to 3.5 MV is obviously the most critical challenge in a successful construction and operation of the RF systems for TPS. The 500-MHz SRF module of KEKB type was selected for TPS because of its reliable operational record at a RF power rating up to 350 kW at KEKB [2, 3] and the availability of an external quality factor (Qext) down to 7*10 satisfying the SRF operation for TPS. 508-MHz SRF modules of KEKB type in eight sets have been operated for the high-energy ring of KEKB since 2000, and are ready in operation for the upgraded collider SuperKEKB. 500-MHz SRF modules of KEKB type in two sets have been in operation for BECP-II at IHEP since 2006 [4]. All those SRF modules of KEKB type were mechanically manufactured by Mitsubishi Electric Corporation (MELCO). Following an agreement of technology transfer from KEK to NSRRC at the end of 2009, a commercial contract was awarded to Mitsubishi Heavy Industries Ltd. (MHI) in 2010 June for the mechanical fabrication of 500-MHz SRF modules of KEKB type in three (3) sets for TPS. MHI had delivered SRF modules of several types to KEK but for the first time were manufacturing the 500-MHz SRF modules of KEKB type for routine operation. The RF processing of high-power input couplers (up to 300 kW, CW) and LBP/SBP HOM dampers (up to 7 kW and 5 kW, CW, respectively) in test stands, the surface treatments, frequency tuning and vertical test of the niobium cavities (up to 3 MV), and liquid-helium test of the MHI-assembled cryo-module were undertaken mainly by the SC group of KEK with joint manpower from MHI and NSRRC. The cryo-modules and associated end groups of room-temperature vacuum beamline components were then delivered to NSRRC for final assembly, system integration with the cryogenic regulation system, SRF electronics and diagnostic system, and RF plant, high-power RF conditioning of the coupler (up to 300 kW, CW), high RF power performance (horizontal) test (up to 2.4 MV or 300 kW, CW), and the long-term reliability test at 1.6 MV. Here we report some results and lessons obtained during the production and tests of these three SRF modules at KEK and NSRRC." @default.
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• W2557247514 date "2013-01-01" @default.
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• W2557247514 title "Production of 500 MHz SRF Modules the KEKB-type for Taiwan Photon Source" @default.
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