Abstracts Brochure - CERN

TUPLS094
TUPLS095
TUPLS096
27-Jun-06 16:00 - 18:00 TUPLS — Poster Session
measured. With the Nd-glass laser (3 J / 30 ns), we could not obtain high charge state ions. A new Nd-YAG laser (2.3
J / 6 ns) enabled us to observe many high charged ions and the most produced ions were Ag 15+ . We completed the
plasma distribution measurements. Based on these results, we designed the new RFQ, which will accommodate Q /
M = 1 / 8 particles, supposing Ag + 15.
Development of a Permanent Magnet Microwave Ion Source for Medical Accelerators
S. Hara, T. Iga, M. Tanaka (Hitachi, Ltd., Power & Industrial Systems
R&D Laboratory)
248
A permanent magnet microwave ion source
was developed to improve availability of proton
accelerator application systems based on
industrial microwave ion source technolo-
gies. The ion source needs no filament in the discharge chamber, which leads to reliability improvement and
less maintenance time. Because the ion source uses a permanent magnet, the ion source needs no coils, no coil power
and no coil coolant. The hydrogen beam of over 60 mA has been extracted from a single 5mm diameter aperture with
a proton fraction of 85% at a microwave power of 1.3kW. Rise times of the microwave power and beam current to 90
% of the final value were about 30 and 100µseconds respectively at a pulse operation mode with 400µseconds pulse
width and 20 Hz repetition rate. These performance parameters are equal to the solenoid coil ion source parameters,
making the ion source desirable for accelerator applications like proton therapy systems.
Recent Progress about DPIS
M. Okamura, R.A. Jameson (RIKEN) T. Kanesue (Kyushu University)
H. Kashiwagi (JAEA/ARTC) A. Kondrashev (ITEP) K. Sakakibara
(RLNR) A. Schempp (IAP) J. Tamura (TIT)
We have focused on high brightness of induced
plasma in Laser Ion Source (LIS) to
provide intense highly charged ions efficiently.
To take the advantage of the intrinsic
density of the laser plasma, Direct Plasma
Injection Scheme (DPIS) has been developed. The induced laser plasma has initial expanding velocity and can be
delivered directly to the RFQ. Extraction electrodes and focusing devices in LEBT are not needed. Since 2004, a newly
designed RFQ has been used to verify the capability of the new ion production scheme. We succeeded to accelerate
60 m A of Carbon beam and 60 mA of Aluminium beam. We have also tried to understand plasma properties of
various species by measuring charge states distributions and time structures, and are now ready to accelerate heavier
species. Currently Silver 15+ beam is planned to be accelerated. In the conference, design strategies and detailed
techniques for the DPIS will be described based on the measured plasma properties of various elements and new
findings obtained from recent acceleration experiments. The durability and the reproducibility will be also explained.
Strongly Focused He + Beam Source for Alpha Particle Measurement on ITER
K. Shinto, S. Kitajima, A. O. Okamoto, M. Sasao (Tohoku University)
Y. H. Hirano, S. Kiyama, H. S. Sakakita (AIST) O. Kaneko, M.
Nishiura (NIFS) M. Wada (Doshisha University, Graduate School of
Engineering)
A He + beam source for He0 beam probe for
measurement of fusion produced alphas due
to D-T nuclear reaction in a thermonuclear
fusion plasma has been designed and constructed.
The ion source consists of a 300 mm
diameter and 280 mm length plasma cham-
ber and a beam extraction system which has three concaved electrodes. Helium plasma is confined by line cusp