| Paper |
Title |
Page |
| MOPCH065 |
Fabrication and Installation of Superconducting Accelerator Modules for the ERL Prototype (ERLP) at Daresbury
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178 |
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- P. vom Stein, S. Bauer, M. Pekeler, H. Vogel
ACCEL, Bergisch Gladbach
- R. Bate, C.D. Beard, D.M. Dykes, P.A. McIntosh, B. Todd
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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Installation and commissioning of the superconducting energy recovery linac(ERL) prototype is under way at Daresbury Laboratory. ACCEL have manufactured two superconducting accelerator modules for the injector and the linac, operating at 2K with 1.3 GHz TESLA type cavities. Each module contains two cavities and is designed to provide an accelerating voltage of 25 MV in cw mode. This paper presents details of the module fabrication, cavity preparation and performance results. An overview of the cryogenic installations for the modules is given and status results of the commissioning are discussed.
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| MOPCH070 |
The Status of the Daresbury Energy Recovery Prototype Project
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187 |
| |
- D.J. Holder, J.A. Clarke, P.A. McIntosh, M.W. Poole, S.L. Smith
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- N. Bliss
CCLRC/DL, Daresbury, Warrington, Cheshire
- E.A. Seddon
CCLRC/DL/SRD, Daresbury, Warrington, Cheshire
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The major component of the UK's R&D programme towards an advanced energy recovery linac-based light source facility is a 35 MeV technology demonstrator called the energy recovery linac prototype (ERLP). This is based on a combination of a DC photocathode electron gun, a superconducting linac operated in energy recovery mode and an IR FEL. The current status of the of this project is presented, including the construction and commissioning progress and plans for the future exploitation of this scientific and technical R&D facility.
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| MOPCH161 |
Development of a Prototype Superconducting CW Cavity and Cryomodule for Energy Recovery
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436 |
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- P.A. McIntosh, C.D. Beard, D.M. Dykes, B. Todd
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- S.A. Belomestnykh
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
- A. Buechner, P. Michel, J. Teichert
FZR, Dresden
- J.M. Byrd, J.N. Corlett, D. Li
LBNL, Berkeley, California
- T. Kimura, T.I. Smith
Stanford University, Stanford, Califormia
- M. Liepe, V. Medjidzade, H. Padamsee, J. Sears, V.D. Shemelin
Cornell University, Ithaca, New York
- D. Proch
DESY, Hamburg
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Energy Recovery LINAC (ERL) and LINAC-driven FEL proposals and developments are now widespread around the world. Superconducting RF (SRF) cavity advances made over the last 10 years for TESLA/TTF at 1.3 GHz, in reliably achieving accelerating gradients >20 MV/m, suggest their suitability for these ERL and FEL accelerators. Typically however, photon fluxes are maximised from the associated insertion devices when the electron bunch repetition rate is as high as possible, making CW-mode operation at high average current a fundamental requirement for these light sources. Challenges arise in controlling the substantial HOM power and in minimizing the power dissipated at cryogenic temperatures during acceleration and energy recovery, requiring novel techniques to be employed. This paper details a collaborative development for an advanced high-Qo cavity and cryomodule system, based on a modified TESLA cavity, housed in a Stanford/Rossendorf cryomodule. The cavity incorporates a Cornell developed resistive-wall HOM damping scheme, capable of providing the improved level of HOM damping and reduced thermal load required.
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| MOPCH162 |
RF Requirements for the 4GLS Linac Systems
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439 |
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- P.A. McIntosh, C.D. Beard, D.M. Dykes, A.J. Moss
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The 4GLS facility at Daresbury will combine energy recovery linac (ERL) and free electron laser (FEL) technologies to deliver a suite of naturally synchronised state-of-the-art sources of synchrotron radiation and FEL radiation covering the terahertz (THz) to soft X-ray regimes. CW-mode operation at high acceleration gradients are needed for the various 4GLS accelerator systems and here is where Superconducting Radio Frequency (SRF) cavities excel. Since resistive losses in the cavity walls increase as the square of the accelerating voltage, conventional copper cavities become uneconomical when the demand for high CW voltage grows with particle energy requirements. After accounting for the refrigeration power needed to provide the liquid helium operating temperature, a net power gain of several hundred remains for SRF over conventional copper cavities. This paper details the RF requirements for each of the SRF accelerating stages of the 4GLS facility, outlining techniques necessary to cope with CW-mode operation and HOM power generation.
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