The RAL Front End Test Stand.

Alan Letchford

The RAL Front End Test Stand (FETS) is part of CCLRC’s contribution to generic high power accelerator R&D.

Specifically the FETS will demonstrate some key technologies associated with the front end of the next generation of spallation sources, neutrino factory, waste transmuters, tritium production …

The beginnings of FETS were in the European Spallation Source (ESS) project which identified the front end and specifically the chopper as key R&D.

CCLRC/RAL continued to support the chopper developments through HIPPI and the need for a facility for beam tests of the chopper became clear.

FETS was born and the goals extended to demonstrating front end technology for a range of future HPPAs.

Although generic in nature FETS is currently being supported as part of the proton driver studies for the UK Neutrino Factory (UKNF) and a forms the basis for possible future linac upgrades to the ISIS facility.

FETS is also directly applicable to future long and short pulse ESS scenarios.

The FETS is a collaborative effort between

CCLRC RAL ISISCCLRC ASTeC Intense Beams GroupDepartment of Physics, Imperial College LondonDepartment of Physics, University of WarwickUniversity of the Basque Country, Spain

FETS main components:•High brightness H- ion source.•Magnetic Low Energy Beam Transport (LEBT).

Chopper•High current, high duty factor Radio Frequency Quadrupole (RFQ).•Very high speed beam chopper.•Comprehensive diagnostics.

The FETS specification:

60 mA H- ion source65 keV 3 solenoid magnetic LEBT324 MHz, 3 MeV RFQHigh speed beam chopper & MEBTConventional and non-destructive diagnostics

Up to 2 ms pulse lengthUp to 50 pps rep. rate‘Perfect’ chopping

John Back (Warwick)Aaron Cheng (Imperial)Mike Clarke-Gayther (ISIS/ASTeC)Adeline Daly (ISIS)Dan Faircloth (ISIS)Christoph Gabor (ASTeC)Simon Jolly (Imperial)Ajit Kurup (Imperial)David Lee (Imperial)Alan Letchford (ISIS)Ciprian Plostinar (ASTeC)Jürgen Pozimski (ASTeC/Imperial)Peter Savage (Imperial)

The FETS team