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TUPP074 |
Study on Fabrication of Superconducting RF 9-cell Cavity for ILC at KEK. | |
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| We had constructed the Cavity Fabrication Facility (CFF) for the fabrication of superconducting RF cavity at KEK from 2009 to 2011. In the facility, we installed a deep-drawing machine, a half-cup trimming machine, an electron-beam welding machine, and a chemical etching room in one place. We started the study on the fabrication of 9-cell cavity for International Linear Collier (ILC) from 2009 using this facility. The study is focusing on the cost reduction with keeping high performance of cavity, and the goal is the establishment of mass-production procedure for ILC. We finished the fabrication of two 9-cell cavities by using tools, machines, and equipment of this facility. This article reports the current status of the studies on fabrication of cavity, including the results of vertical tests for the 9-cell cavities which were fabricated in this facillity. | ||
| TUPP075 | The First Beam Recirculation and Beam Tuning in the Compact ERL at KEK | 599 |
| TUPOL01 | use link to see paper's listing under its alternate paper code | |
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Superconducting(SC)-linac-based light sources, which can produce ultra-brilliant photon beams in CW operation, are attracting worldwide attention. In KEK, we have been conducting R&D efforts towards the energy-recovery-linac(ERL)-based light source* since 2006. To demonstrate the key technologies for the ERL, we constructed the Compact ERL (cERL)** from 2009 to 2013. In the cERL, high-brightness CW electron beams are produced using a 500-kV photocathode DC gun. The beams are accelerated using SC cavities, transported through a recirculation loop, decelerated in the SC cavities, and dumped. In the February of 2014, we succeeded in accelerating and recirculating the CW beams of 4.5 micro-amperes in the cERL; the beams were successfully transported from the gun to the beam dump under energy recovery operation in the main linac. Then, precise tuning of beam optics and diagnostics of beam properties are under way. We report our experience on the beam commissioning, as well as the results of initial measurements of beam properties.
* N. Nakamura, IPAC2012, TUXB02. ** S. Sakanaka et al., IPAC2013, WEPWA015. |
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| THPP021 | Analysis of the RF Test Results from the On-going Accelerator Cavity Production for the European XFEL | 879 |
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Funding: The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no 283745 (CRISP) The main Linac of the European XFEL will consist of 100 superconducting accelerator modules, operated at an average design gradient of 23.6 MV/m. The fabrication by industry (which includes chemical surface preparation) of the required 800 superconducting cavities is now in full swing, with approximately 400 cavities having been delivered to date. In this interim report, we present an analysis of the RF acceptance tests amassed so far. |
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| THPP093 | Combined System of Optical Inspection and Local Grinder | 1065 |
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| Optical inspections on superconducting accelerating tubes have been playing an important role on improving their accelerating gradients. Instead of treatments on whole cavity inner surfaces to eliminate the found defects on the surfaces, the local grinding method succeeds to remove them efficiently. A combined system of the optical inspection and the local Grinding machines are fabricated. The overview of the system will be presented. | ||