CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
CEA, Gif-sur-Yvette
*Proceedings of SRF Workshop – Ithaca (July 2005) – TuP05.
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
KEK, Ibaraki
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| MOZBPA02 | A Review of ERL Prototype Experience and Light Source Design Challenges | ERL, FEL, linac, gun | 39 | ||||
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The presentation will review the status of commissioning of ERL light source prototype projects drawing on experience from the JLab IR FEL, UK's ERL prototype ring and the Cornell injector project. State of the art design for future light source based on ERLs and FELs will be illustrated using the concept for the UK's 4GLS project.
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Transparencies
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| MOPCH141 | Fast Argon-Baking Process for Mass Production of Niobium Superconducting RF Cavities | ion, vacuum, lattice, superconductivity | 381 | ||||
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Baking is a necessary stage to reach high gradients with niobium superconducting cavities. In the standard process, so called "in-situ UHV baking", Nb cavity is baked at 110°C, during 2 days. During this treatment the inner part of the cavity is pumped out under Ultra High Vacuum conditions. In order to save time, "fast UHV baking" at 145 °C during 3 hours, under UHV pumping, has been successfully demonstrated* with similar improvements for cavity performances compare to the standard treatment. With the same simplification concern, we report here about an alternative method to avoid restrictive UHV requirements. Experiments have been carried out to perform "fast baking" in oxygen-free atmosphere, because bad performances have been observed with "fast baking" in air. These degradations are closely connected with a strong oxygen penetration in bulk analysed by Secondary Ion Mass Spectroscopyon on Nb samples .
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*Proceedings of SRF Workshop – Ithaca (July 2005) – TuP05. |
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| MOPCH176 | A Comparison of Large Grain and Fine Grain Cavities Using Thermometry | superconductivity, site, cryogenics | 475 | ||||
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An important limitation for SRF niobium cavities is the ”high field Q-slope.” To investigate this phenomenon we compare the behavior of large grain and fine grain cavities using thermometry. Thermometry allows us to distinguish between different problems which occur in cavities, and to distinguish between different areas showing high field Q-slope. We looked for the difference in heating between grain boundaries and inside grains. We have found interesting differences between the heating of high field slope regions and the heating of point-like defects.
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| MOPCH190 | Cryomodule Development for Superconducting RF Test Facility (STF) at KEK | KEK, TESLA, vacuum, alignment | 505 | ||||
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Current status of the cryomodule development for superconducting RF test facility, STF, at KEK is presented. The objective of the STF construction is to have an experience of 5-m long cryomodule fabrications and to learn an operational method of superconducting RF cavities. The STF consists of two 5-m long cryomodules, each housing four 9-cell cavities (one for 35 MV/m and the other for 45 MV/m). In addition to the cavity type, each cavity has variations in its appendices. Thus, two cryomodules must have different structures for the cavity support and for the port of the RF input coupler. This paper describes the details of the cryomodule design, the development of the bimetallic joint for connecting the titanium helium vessel to the stainless steel cooling pipe, and the studies of the magnetic shielding for high quality cavities.
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