Front End Test Stand - Continuation

Lead Research Organisation: University of Huddersfield
Department Name: Sch of Applied Sciences

Abstract

High power proton accelerators (HPPAs) are at the heart of many future large scale scientific facilities such as a spallation-neutron source, Neutrino Factory, high energy physics at the energy or intensity frontier, accelerator driven sub-critical systems, and the transmutation of nuclear waste. Controlling beam-loss induced machine activation during injection into a circular accelerator (synchrotron or FFAG) is essential for safe operation of HPPAs and requires the beam in the injector linac to be chopped very precisely at the synchrotron revolution frequency. The Front End Test Stand (FETS) at RAL has as its primary aim to demonstrate perfect chopping of a high quality, high intensity, negative Hydrogen ion beam at an energy of 3 MeV.
Although primarily a hardware construction project, the FETS collaboration has become an efficient mechanism for sharing the wealth of real-world accelerator expertise within ISIS and the ASTeC Intense Beams Group with the wider academic community as well as benefitting from the specialisations and expertise of the university groups. The work already undertaken has contributed to the UK's continuing international reputation as a centre of excellence and has stimulated collaborations with leading international accelerator institutes such as CERN, FNAL, ESS and CNS.
FETS consists of a high-brightness Penning surface plasma negative-hydrogen-ion source, magnetic Low Energy Beam Transport (LEBT) at 65 keV to match the beam into a 3 MeV Radio Frequency Quadrupole (RFQ) operating at 324 MHz which delivers the 60mA beam to the Medium Energy Beam Transport (MEBT) where the chopping systems are situated. Comprehensive, state-of-the-art diagnostics measure the performance of the system and the beam quality. The ion source, LEBT and high power RF systems have been commissioned and the manufacture of the RFQ is underway.
With this proposal we seek the resources to complete the construction of FETS in a timely manner. This will entail:
The installation, testing and commissioning of the RFQ;
Accelerating the desired beam intensity and beam quality through the RFQ;
The completion of the engineering design and the manufacture of the chopper systems;
The installation, testing and commissioning the MEBT and chopper systems;
The transmission of beam through the MEBT and the demonstration of precise and efficient beam chopping; and
Evaluating the performance of the complete test stand.
In addition, we proposed to evaluate the additional benefits that will accrue from exploiting the FETS as a driver for further developments in proton accelerator systems.

Publications

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Ratcliffe N. (2012) Optimising neutron production from compact low energy accelerators in IPAC 2012 - International Particle Accelerator Conference 2012

 
Description Significant progress had been made in determining how to do beam pull measurements with the FETS RFQ and how to tune the device. Knowledge has also be gained in the use of Comsol to help with the tuning. The project is still on-going, however, and further work in these areas is still required.
Exploitation Route Once the work is complete, they may used for beadpull measurements of other RFQs. Note that these are now being studied for a variety of uses.
Sectors Energy,Healthcare