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ERLP

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MOPCH064 The Specification, Design and Measurement of Magnets for the Energy Recovery Linac Prototype (ERLP) at Daresbury Laboratory dipole, quadrupole, linac, FEL 175
 
  • F. Bødker
    Danfysik A/S, Jyllinge
  • N. Marks, N. Thompson
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The Energy Recovery Linac Prototype (ERLP) is currently under construction at Daresbury Laboratory in the UK and will serve as a test bed for the investigation of technologies and beam physics issues necessary for the development of Daresbury Laboratory's Fourth Generation Light Source (4GLS) proposal. A number of new ERLP beam transport system magnets have been procured for the project. The magnets have been designed, manufactured and measured by Danfysik following a stringent magnetic field specification produced by Daresbury Laboratory. In this paper we summarise the magnet specification. We then present details of the magnetic and mechanical design of the magnets and finally discuss the measurement techniques used to demonstrate that the field quality of the magnets satisfied the specification.  
 
MOPCH065 Fabrication and Installation of Superconducting Accelerator Modules for the ERL Prototype (ERLP) at Daresbury vacuum, cryogenics, TESLA, linac 178
 
  • 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
  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.  
 
MOPCH070 The Status of the Daresbury Energy Recovery Prototype Project gun, linac, diagnostics, electron 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
  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.  
 
MOPCH161 Development of a Prototype Superconducting CW Cavity and Cryomodule for Energy Recovery ERL, TESLA, linac, TTF 436
 
  • 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
  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.  
 
MOPCH187 Key Cryogenics Challenges in the Development of the 4GLS linac, cryogenics, TESLA, FEL 499
 
  • R. Bate, R.K. Buckley, A.R. Goulden, C. Hodgkinson, S.M. Pattalwar
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The fourth generation light source (4GLS) is a uniquely flexible source of ultra-high brightness continuous and pulsed radiation covering the IR to XUV range of the spectrum. It is the first light source in the world that is planned from the outset to be a multi-user, multi-source facility combining ERL (energy recovery LINAC) and FEL (free electron laser) technology. 4GLS will require six different sets of superconducting LINACs. Each of the LINAC modules consists of 2 to 7, 1.3 GHz superconducting RF cavities of the TESLA design operating at 1.8 K. The overall cooling power necessary to cool the cavities is estimated to be around 2.5KW demanding the superfluid liquid helium flow rates in excess of 200g/s. Even though the technology of the superconducting RF cavities is somewhat well understood, the design and subsequent operation of the cryogenic system / Cryo modules is an extremely complex task. In this paper we describe the key cryogenic challenges of the 4GLS project and our approach in identifying solutions to meet them.  
 
TUPCH038 Beam Loss Monitoring and Machine Protection Designs for the Daresbury Laboratory Energy Recovery Linac Prototype electron, radiation, beam-losses, monitoring 1088
 
  • S.R. Buckley, R.J. Smith
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  Daresbury Laboratory is currently constructing an energy recovery linac prototype (ERLP). This is to carry out the necessary research and development of the technology of photo-cathode electron guns and superconducting linacs so that a fourth generation light source (4GLS) can be designed and constructed. Beam loss monitoring and machine protection systems are vital areas for the successful operation of the ERLP. These systems are required, both for efficient commissioning and for hardware protection during operation. This paper gives an overview of the system requirements, options available and details of the final design specification.  
 
TUPCH150 Improved 1.3 GHz Inductive Output Tube for Particle Accelerators synchrotron, linac, klystron 1373
 
  • A.E. Wheelhouse
    e2v technologies, Chelmsford, Essex
  There is an increasing requirement for RF power sources in the L-band frequency range for operation in particle accelerators. Previously (at PAC 2005), the design, development and initial testing of a new L-band 16kW cw inductive output tube (IOT) was described. This paper discusses the detailed performance characteristics of the latest EEV IOT116LS embodying the most recent design improvements and presents data demonstrating its suitability for operation at 1.3GHz in the next generation of light sources.  
 
TUPCH151 ERLP/4GLS Low Level Radio Frequency System controls, linac, laser, feedback 1376
 
  • A.J. Moss, P.A. Corlett, J.F. Orrett, J.H.P. Rogers
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The Energy Recovery Linac Prototype (ERLP) being constructed at Daresbury Laboratory will use an analog-based low level RF (LLRF) control system designed and built at FZR Rossendorf. Once the machine is operational, the testing and development of a digital LLRF feedback system will take place using the ERLP as a testbed.  
 
TUPCH153 IOT Testing at the ERLP power-supply, controls, klystron, DIAMOND 1382
 
  • J.F. Orrett, S.R. Buckley, P.A. Corlett, A.J. Moss
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • S. Rains
    Diamond, Oxfordshire
  The testing of Inductive Output Tubes (IOT) at 1.3GHz is underway for use on the Energy Recovery Linac Prototype (ERLP) being constructed at Daresbury Laboratory. A 50KV high voltage power supply (HVPS) has been commissioned and characterised for use as a test RF supply. This will be used to power the ERLP RF system in both continuous and pulse modes of operation. First results are presented of the IOTs and the use of the HVPS system.  
 
WEPLS065 The Effect of Vaccum Vessel Permeability on the Field Quality within Dipole and Quadrupole Magnets at the Energy Recovery Linac Prototype (ERLP) at Daresbury Laboratory dipole, vacuum, quadrupole, linac 2529
 
  • N. Thompson
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The Energy Recovery Linac Prototype (ERLP) is currently under construction at Daresbury Laboratory in the UK and will serve as a test bed for the investigation of technologies and beam physics issues necessary for the development of Daresbury Laboratory's Fourth Generation Light Source (4GLS) proposal. To assist with the material specification of the vacuum vessels, analyses have been done on the effect of vessel permeability on the magnetic field quality within quadrupole and dipole magnets. It is found that for dipoles where the specified maximum relative dipole field variation over the good field region is ± 1x 10-4 or for quadrupoles where the specified maximum relative gradient variation is ±1 1x10-3, the transverse size of the good field region decays unacceptably for relative permeability > 1.006. However, for the dipoles where the specified maximum relative dipole field variation is ± 1x10-3, the decay of the good field region is more gradual and would safely permit a material with relative permeability >1.006 to be used for the vacuum vessel within these dipoles.  
 
THPCH165 ERLP Quantum Efficiency Scanner cathode, laser, controls, linac 3179
 
  • P.A. Corlett, J.H.P. Rogers
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The Energy Recovery Linac Prototype (ERLP) under construction at Daresbury Laboratory will utilise a photoinjector as its electron source. In order to characterise the performance of the photo-cathode wafer, a low power laser is scanned across its surface and the resultant current measured to build up a map of the quantum efficiency of the wafer.