Abstracts Brochure - CERN

MOPCH — Poster Session 26-Jun-06 16:00 - 18:00
Injection Studies on the ISIS Synchrotron
The ISIS Facility at the Rutherford Appleton
Laboratory in the UK produces intense neu- D.J. Adams, C.M. Warsop (CCLRC/RAL/ASTeC)
tron and muon beams for condensed matter
research. It is based on a 50 Hz proton synchrotron which, once the commissioning of a new dual harmonic RF system
is complete, will accelerate about 3.5·10 13 protons per pulse from 70 to 800 MeV, corresponding to mean beam powers
of 0.2 MW. The multi-turn charge-exchange injection process strongly affects transverse beam distributions, space
charge forces, beam loss and therefore operational intensity. The evolution of longitudinal distributions and subsequent
trapping efficiency is also intimately linked with injection. Optimising injection is therefore a key consideration
for present and future upgrades. Work is now under way looking at this process in more detail and relates closely to
other transverse space charge studies on the ring. This paper presents work including: space charge simulations of
the present machine and comparison with observations; assessment of related loss mechanisms; and study of optimal
painting schemes. Plans and preparations for more detailed experimental work are also summarised.
A Fast Beam Chopper for the RAL Front End Test Stand (FETS)
The FETS project at RAL will test a fast
beam chopper, designed to address the requirements
of high power proton drivers
for next generation pulsed spallation sources
M.A. Clarke-Gayther (CCLRC/RAL/ASTeC) G. Bellodi, F. Gerigk
(CERN)
and neutrino factories. A description is given of the novel RAL ’Fast - Slow’ chopping scheme, and of candidate
optical designs for the 3.0 MeV, 60 mA, H − Medium Energy Beam Transport (MEBT) line.
The RAL Front End Test Stand
High power proton accelerators (HPPAs)
with beam powers in the megawatt range
have many possible applications including
drivers for spallation neutron sources, neutrino
factories, waste transmuters and tritium
production facilities. These applications typically
propose beam powers of 5 MW or more
A.P. Letchford, D.C. Faircloth (CCLRC/RAL/ISIS) J.J. Back (University
of Warwick) Y.A. Cheng, S. Jolly, A. Kurup, P. Savage (Imperial
College of Science and Technology, Department of Physics) M.A.
Clarke-Gayther, D.C. Plostinar (CCLRC/RAL/ASTeC) J.K. Pozimski
(CCLRC/RAL)
compared to the highest beam power achieved from a pulsed proton accelerator in routine operation of 0.16 MW at
ISIS. The UK’s commitment to the development of the next generation of HPPAs is demonstrated by a test stand being
constructed in collaboration between RAL, Imperial College London and the University of Warwick. The aim of the
RAL Front End Test Stand is to demonstrate that chopped low energy beams of high quality can be produced and is
intended to allow generic experiments exploring a variety of operational regimes. This paper describes the status of
the RAL Front End Test Stand which consists of five main components: a 60 mA H − ion source, a low energy beam
transport, a 324 MHz Radio Frequency Quadrupole accelerator, a high speed beam chopper and a comprehensive
suite of diagnostics. The aim is to demonstrate production of a 60 mA, 2 ms, 50 pps, chopped H − beam at 3 MeV.
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