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Abstracts Brochure - CERN

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MOPCH107<br />

MOPCH108<br />

MOPCH109<br />

26-Jun-06 16:00 - 18:00 MOPCH — Poster Session<br />

Tuning Procedure of the 6 Meters IPHI RFQ<br />

In the framework of the IPHI project (High<br />

O. Piquet, M. Desmons, A. France (CEA)<br />

Intensity Proton Injector), the RFQ cavity is<br />

divided into 6 sections of 1 meter each, and<br />

assembled in 3 segments separated by coupling plates. We will present the tuning procedure of the aluminium RFQ<br />

cold model to set the accelerating mode frequency, a flat voltage profile and to minimize the dipole components of<br />

the accelerating voltage. This tuning procedure can be divided in three steps. First, dipole mode frequencies are<br />

adjusted with rods for the 3 separated segments. Second, RFQ end cells and coupling cells are tuned by mechanical<br />

machining of tuning plates. Third, using a fully automated bead-pull for the measurement of the field distribution<br />

inside every RFQ quadrants, the RFQ is tuned with 96 plungers in a small number of iterations. Tuning this 6-meter<br />

long cold model is a comprehensive training in view of the future tuning of the copper RFQ with the variable voltage<br />

profile.<br />

Error Study of LINAC 4<br />

Within the framework of the Joint Research<br />

M.A. Baylac, J.-M. De Conto, E. Froidefond (LPSC)<br />

Activity HIPPI (High Intensity Pulsed Proton<br />

Injector) of the CARE program, the conception<br />

study of the LINAC 4 accelerator which aims to intensify the proton flux available for the <strong>CERN</strong> injection line is<br />

pursued. The linac, operating in pulsed mode at 352 MHz, is designed to accelerate a 65 mA beam of H − ions up to an<br />

energy of 160 MeV. The requirements on acceptable beam emittance growth and particle loss are extremely tight. In<br />

order to determine the Drift Tube Linac tolerances, we examined the sensitivity of the LINAC 4 DTL to errors on the<br />

accelerating field and the focusing quadrupoles. Simulations were performed with the transport code TRACEWIN<br />

(CEA-Saclay, France). We will present results on individual sensitivities to a single error as well as the global impact<br />

of alignment and RF errors on the beam quality. Similarly, accelerating structures following the DTL in the LINAC4<br />

design (CCDTL, SCL) have been studied.<br />

Design Studies on a Novel Stellarator Type High Current Ion Storage Ring<br />

A high current storage ring for the accumula-<br />

M. Droba, N.S. Joshi, O. Meusel, P. Nonn, U. Ratzinger (IAP) tion of ion beams provided by a new 150 kV<br />

terminal is under consideration at the Frankfurt<br />

University. The configuration based on a toroidal magnetic field seems promising for the storage of intense low<br />

energy ion beams, especially when concerning the various potential concepts for space charge compensation. The<br />

theory of plasma confinement on magnetic surface is transformed to numerical simulations on circulating ion beams.<br />

The space charge effects and stability conditions are studied and will be presented. Various injection techniques based<br />

on crossed field-drifts are investigated. Accordingly test experiments are prepared based on two 30 degree toroidal<br />

sectors at a major radius of 1.3m with a maximum toroidal magnetic field of 0.6T on axis.<br />

78

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