McIntosh P.

Paper	Title	Page
MO203	ERLP and 4GLS at Daresbury
	P. McIntosh STFC Daresbury Laboratory
	As part of the UK R&D programme to develop an advanced energy recovery linac (ERL) based light source (4GLS), a 35 MeV technology demonstrator called the Energy Recovery Linac Prototype (ERLP) has been constructed at Daresbury Laboratory. It is based on a combination of a DC photocathode electron gun, a Superconducting RF (SRF) injector linac and main linac operating in energy recovery mode, driving an IR-FEL. The priorities for this machine are to gain experience of operating a photoinjector gun and SRF linacs; to produce and maintain high-brightness electron beams; to achieve energy recovery from an FEL-disrupted beam and to study challenging synchronisation issues. The experience gained from this demonstrator will facilitate the more expansive 4GLS facility which will combine 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 will be needed for the various 4GLS accelerator systems and here is where SRF cavities excel. This review details the ERLP facility and highlights its present status, whilst also outlining the principal RF features and requirements of the 4GLS accelerator design; including the R&D currently being performed to develop a cryomodule that would facilitate ERL operation on 4GLS.
	Slides(PDF)
WEP42	Status of the ILC crab cavity development	579
	G. Burt, A. Dexter Cockcroft Institute, Lancaster University C. Beard, P. Goudket, P. McIntosh STFC Daresbury Laboratory L. Bellantoni Fermilab T. Grimm Niowave, Inc Z. Li, L. Xiao SLAC
	The International Linear Collider (ILC) will require two dipole cavities to "crab" the electron and positron bunches prior to their collision. It is proposed to use two 9 cell SCRF dipole cavities operating at a frequency of 3.9 GHz, with a transverse gradient of 3.8MV/m in order to provide the required transverse kick. Extensive numerical modelling of this cavity and its couplers has been performed. Aluminium prototypes have been manufactured and tested to measure the RF properties of the cavity and couplers. In addition single cell niobium prototypes have been manufactured and tested in a vertical cryostat.