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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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| MOPLS071 |
TDR Measurements in support of ILC Collimator Studies
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712 |
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- C.D. Beard, P.A. Corlett, A.J. Moss, J.H.P. Rogers
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- R.M. Jones
Cockcroft Institute, Warrington, Cheshire
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In this report the outcome of the "wire method" cold test, experimental results and their relevance toward the ILC set-up is considered. A wire is stretched through the centre of a vessel along the axis that the electron beam would take, and a voltage pulse representing the electron bunch is passed along the wire. The parasitic mode loss parameter from this voltage can then be measured. The bunch length for the ILC is 0.3mm, requiring a pulse rise time of ~1ps. The fastest rise time available for a time domain reflectrometry (TDR) scope is ~10ps. Reference vessels have been examined to evaluate the suitability of the test gear at comparable bunch structures to the ILC.
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| TUPCH151 |
ERLP/4GLS Low Level Radio Frequency System
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1376 |
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- A.J. Moss, P.A. Corlett, J.F. Orrett, J.H.P. Rogers
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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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.
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| TUPCH152 |
MICE RF Test Stand
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1379 |
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- P.A. Corlett, A.J. Moss, J.F. Orrett
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The Muon Ionization Cooling Experiment (MICE) RF test stand is being assembled at Daresbury Laboratory. This will provide a test bed for power amplifiers to produce the 2MW 200MHz RF for the MICE experiment RF cavities. Initial design and proposed layout of the RF system are described.
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| TUPCH153 |
IOT Testing at the ERLP
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1382 |
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- J.F. Orrett, S.R. Buckley, P.A. Corlett, A.J. Moss
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- S. Rains
Diamond, Oxfordshire
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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.
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