Abstracts Brochure - CERN

TUPLS — Poster Session 27-Jun-06 16:00 - 18:00
A Non-scaling FFAG for Radioactive Beams Acceleration (RIA)
One of the most expensive components of
proposals to accelerate heavy radioactive D. Trbojevic, T. Roser, A.G. Ruggiero (BNL)
beams is the superconducting linac. This is
an attempt to design a non-scaling Fixed-Field Alternating-Gradient (FFAG) lattice to allow acceleration of heavy
radioactive beams in a short time period with an acceptance in momentum of ±50%. As it had been previously
reported the non-scaling FFAG has very small orbit offsets, very strong focusing, and large momentum acceptance.
The lattice with small combined function magnets would provide substantial savings in the cost of the RF.
An Irradiation System for Carbon Stripper Foils with 750keV H − Beams
Carbon stripper foils of around 300 ug/cm2
will be used as a stripping of H-ion beam of
the 3 GeV Rapid Cycling Synchrotron in the
J-PARC. The foil should have a long lifetime
A. Takagi, Y.A. Akakida, Z. Igarashi, K.I. Ikegami, C. Kubota, I.
Sugai, Y. Takeda (KEK) Y. Irie (JAEA/J-PARC)
with mechanically strong against high temperature of 1800K due to high-energy deposition by high intensity H-ion
and circulating bunched proton beam irradiations. For this purpose, we have installed a new irradiation system
using high intensity pulsed and dc H-beams of the KEK 750keV Cocksfoot-Walton accelerator. By adjusting the peak
intensity and the pulse length of the hydrogen beams appropriately, the energy deposition becomes equivalent to
that exerted by the incoming H − and the circulating beams at the injection process of the RCS. The new irradiation
system and some preliminary results of the carbon stripper foil will be reported.
Optical Scheme of an Electrostatic Storage Ring
We consider the optical scheme of an electrostatic
storage ring for low energy heavy ions/ V. Aleksandrov, Yu. Kazarinov, V. Shevtsov (JINR) R. Doerner, H.
molecules* with special requirements to type Schmidt-Boecking, K.E. Stiebing (IKF) A. Schempp (IAP)
of optical functions. Results of calculation
are presented.
*C. P. Welsch et al. Proc. of PAC’03, 12-16 May 2003, Portland, Oregon, USA, p.1622.
Experimental Study of the Stripping Target for 10 mA, 1.25 MeV Ion Beam
An electrostatic tandem accelerator with vacuum
insulation on proton energy of 2.5 MeV V.I. Davydenko, A.S. Krivenko (BINP SB RAS) N.E. Popova (NSU)
and 10 mA current is developed in the BINP.
One of the accelerator important parts is an argon stripping target which converts half-energy accelerated negativehydrogen
ions into a proton beam. The beam-target interaction is considered in the paper. To reduce the argon flux
from the stripping target to the accelerator gaps argon recirculation will be used. The argon atoms in the target are
intensively ionized by 1.25 MeV hydrogen particles that leads to plasma production in the stripping cell. The target
emits argon ions and ultraviolet radiation to the accelerator gaps. To study the argon recirculation and the plasma
production in the stripping cell an experimental test stand is prepared. Ionization of the target by 500 eV electrons
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