Abstracts Brochure - CERN

TUPLS088
TUPLS089
TUPLS090
27-Jun-06 16:00 - 18:00 TUPLS — Poster Session
Energy Distribution of H − Ions from the ISIS Ion Source
D.C. Faircloth, J.W.G. Thomason (CCLRC/RAL/ISIS) G. Doucas,
M. Haigh, I. Ho-ching Yiu, J. Morrison (OXFORDphysics)
246
We have used a specially designed retarding
field energy analyzer with a resolution (∆ E
/E) of approximately 2 x 10 -4 in order to
measure the energy distribution, under dif-
ferent operating conditions, of the H − beam of the ISIS ion source. The poster presents the details of the analyzer and
the first results obtained on the Ion Source Test Facility at RAL.
Pseudospark-sourced Beams of Electrons and Ions
A pseudospark discharge has undergone in-
A.W. Cross, W. He, H. Yin (USTRAT/SUPA)
tensive studies with regard to its unusual and
interesting discharge properties during last
fifteen years. The pseudospark attracts significant attention from diverse fields such as pulsed-power switching, electron
beam generation, free electron masers, ion beam generation, extreme-ultraviolet radiation sources, microthrusters
and pseudospark-triggered wakefield acceleration. This paper will present experiments and measurements of pseudospark-sourced
electron and ion beams for accelerators. Pulsed electron beams with current intensity over 108
Am-2, high brightness up to 1012A m-2 rad-2 and emittance of tens of mm mrad were produced from a multi-gap
pseudospark discharge. The transportation of the pseudospark electron beams is also investigated in order to produce
high peak current, high quality, short (∼100 picosecond) or long duration (2∼100ns) high-brightness electron beam
pulses. Recent results from a high current density pseudospark-produced ion beam experimentally investigated with
hydrogen gas will be presented.
LEBT Simulations and Ion Source Beam Measurements for the Front End Test Stand
(FETS)
S. Jolly, P. Savage (Imperial College of Science and Technology,
Department of Physics) J.J. Back (University of Warwick) D.C. Faircloth,
A.P. Letchford (CCLRC/RAL/ISIS) J.K. Pozimski (CCLRC/
RAL)
The Front End Test Stand (FETS) at the
Rutherford Appleton Laboratory (RAL) is intended
to demonstrate the early stages of acceleration
(0-3MeV) and beam chopping required
for high power proton accelerators,
including proton drivers for pulsed neutron
spallation sources and neutrino factories. Optimisation of the beam focussing within the Low Energy Beam Transport
(LEBT) is necessary to minimise beam losses upon acceleration within the FETS RadioFrequency Quadrupole
(RFQ). Simulations of the LEBT are currently under way using the General Particle Tracer package (GPT). Previous
envelope calculations suggest weak and strong focussing solutions for the LEBT solenoids. Definitive beam dynamics
simulations in GPT require further measurements of the transverse emittances and beam profile of the ion source
beam, due to the sensitivity of the simulations on the initial beam profile and level of space charge compensation. A
pepperpot emittance/profile measurement system has been designed for use on the ISIS ion source development rig.
Results from this pepperpot system are used to constrain the initial conditions for the GPT simulations.