| Paper | Title | Page |
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| MOP115 | Investigating the ILC Single Tunnel Proposal in a Japanese Mountainous Site | 334 |
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It was proposed to change from a 2-tunnel scheme in the ILC Reference Design Report to a single tunnel plan by the GDE, Global Design Effort in order to reduce the construction cost. Two proposals of RF source have been presented to realize this scheme. One is 'Klystron Cluster System', which moves every RF source related components from the underground tunnel to the above ground buildings. This would require that the surface topology be rather flat. Another one is the 'Distributed RF System', which does not greatly increase the above ground facilities, and instead every accelerator components are put into a single main tunnel. Instead of powering with large-scale klystrons, downsized modules are distributed throughout. We propose to make a single accelerator tunnel for active accelerator components based on the latter RF system and a sub-tunnel, in which cooling water piping is installed. The sub-tunnel can also be used for the emergency escape, underground water drainage, maintenance work and etc. This scheme fits to the Japanese mountainous site. |
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| TUP049 | Vane Machining by the Ball-end-mill for the New RFQ in the J-PARC Linac | 518 |
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The J-PARC RFQ (length 3.1m, 4-vane type, 324 MHz) accelerates a negative hydrogen beam from 0.05MeV to 3MeV toward the following DTL. We started the preparation of a new RFQ as a backup machine. The new cavity is divided by three unit tanks in the longitudinal direction. The unit tank consists of two major vanes and two minor vanes. A numerical controlled machining with a conventional ball-end-mill has been chosen for the vane modulation cutting instead of the wheel shape cutter. In this presentation we will report the machining procedure, the results of the vane machining, RF properties, and some topics during the fabrication. |
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| TUP050 | Vacuum Brazing of the New RFQ for the J-PARC Linac | 521 |
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The J-PARC RFQ (length 3.1m, 4-vane type, 324 MHz) accelerates a negative hydrogen beam from 0.05MeV to 3MeV toward the following DTL. We started the preparation of a new RFQ as a backup machine. The new cavity is divided by three unit tanks in the longitudinal direction. The unit tank consists of two major vanes and two minor vanes. A one-step vacuum brazing of a unit tank has been chosen to unite these four vanes together with the flanges and ports. In this presentation we will report the results of the vacuum brazing with the dimension accuracy and an RF property. |