Abstracts Brochure - CERN

MOPCH107
MOPCH108
MOPCH109
26-Jun-06 16:00 - 18:00 MOPCH — Poster Session
Tuning Procedure of the 6 Meters IPHI RFQ
In the framework of the IPHI project (High
O. Piquet, M. Desmons, A. France (CEA)
Intensity Proton Injector), the RFQ cavity is
divided into 6 sections of 1 meter each, and
assembled in 3 segments separated by coupling plates. We will present the tuning procedure of the aluminium RFQ
cold model to set the accelerating mode frequency, a flat voltage profile and to minimize the dipole components of
the accelerating voltage. This tuning procedure can be divided in three steps. First, dipole mode frequencies are
adjusted with rods for the 3 separated segments. Second, RFQ end cells and coupling cells are tuned by mechanical
machining of tuning plates. Third, using a fully automated bead-pull for the measurement of the field distribution
inside every RFQ quadrants, the RFQ is tuned with 96 plungers in a small number of iterations. Tuning this 6-meter
long cold model is a comprehensive training in view of the future tuning of the copper RFQ with the variable voltage
profile.
Error Study of LINAC 4
Within the framework of the Joint Research
M.A. Baylac, J.-M. De Conto, E. Froidefond (LPSC)
Activity HIPPI (High Intensity Pulsed Proton
Injector) of the CARE program, the conception
study of the LINAC 4 accelerator which aims to intensify the proton flux available for the CERN injection line is
pursued. The linac, operating in pulsed mode at 352 MHz, is designed to accelerate a 65 mA beam of H − ions up to an
energy of 160 MeV. The requirements on acceptable beam emittance growth and particle loss are extremely tight. In
order to determine the Drift Tube Linac tolerances, we examined the sensitivity of the LINAC 4 DTL to errors on the
accelerating field and the focusing quadrupoles. Simulations were performed with the transport code TRACEWIN
(CEA-Saclay, France). We will present results on individual sensitivities to a single error as well as the global impact
of alignment and RF errors on the beam quality. Similarly, accelerating structures following the DTL in the LINAC4
design (CCDTL, SCL) have been studied.
Design Studies on a Novel Stellarator Type High Current Ion Storage Ring
A high current storage ring for the accumula-
M. Droba, N.S. Joshi, O. Meusel, P. Nonn, U. Ratzinger (IAP) tion of ion beams provided by a new 150 kV
terminal is under consideration at the Frankfurt
University. The configuration based on a toroidal magnetic field seems promising for the storage of intense low
energy ion beams, especially when concerning the various potential concepts for space charge compensation. The
theory of plasma confinement on magnetic surface is transformed to numerical simulations on circulating ion beams.
The space charge effects and stability conditions are studied and will be presented. Various injection techniques based
on crossed field-drifts are investigated. Accordingly test experiments are prepared based on two 30 degree toroidal
sectors at a major radius of 1.3m with a maximum toroidal magnetic field of 0.6T on axis.
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