Abstracts Brochure - CERN

WEPCH176
WEPCH177
WEPCH178
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
High Power Be Target of Accelerator-based Neutron Source
A. Makhankov, A. Gervash, R.G. Giniyatulin, I. Mazul (NIIEFA) J.
Esposito, L.B. Tecchio (INFN/LNL)
324
An accelerator-based thermal neutron
source, aimed at the BNCT (boron neutron
cancer therapy) treatment of skin melanoma
is in construction at the INFN-LNL in the
framework of SPES project. The BNCT device exploits the intense proton beam provided by a 5 MeV, 30 mA RFQ
that represent the first accelerating step of the SPES exotic nuclei production beam facility. Neutrons are generated
by 9Be(p,n)9B nuclear reaction in a high power (150 kW) beryllium target. For medical application the using of
high activated heat sink materials such as Cu and SS is strongly limited in order to fulfill the therapeutic irradiation
requirements. Two possible designs of neutron converter target are developed: one with saddle block tiles brazed
to CuCrZr tubes and another one with Be target made from solid Be block. The Be target based on saddle block
geometry removes up to 7 MW/m2 heat flux deposited by proton beam while Be solid target removes up to 5 MW/
m2. Prototypes of the Be targets of developed designs have been manufactured and high heat flux tested. Results of
high heat flux testing of Be target prototypes are presented.
Conception of Medical Isotope Production at Electron Accelerator
A photonuclear method with the use of high-
V.L. Uvarov, N.P. Dikiy, A. Dovbnya, V.I. Nikiforov (NSC/KIPT) energy bremsstrahlung (Eg>8 MeV) of high
intensity (>= 10 04 W/cm2) provides a possibility
of the ecologically safe production of a number of isotopes for nuclear medicine. The conditions of generation
of the radiation field having such characteristics as well as the features of photonuclear production of W-181,Pd-103,
Cu-67 and other radionuclides are considered in the report. At the initial stage the study of the isotope production
is performed by means of the computer simulation in a simplified 2D geometry of the Linac output devices. The
code on the base of the PENELOPE/2001 program system supplemented with the data on the excitation functions
of the corresponding reactions was developed. The dependences of the isotope yield (gross and specific activity)
on the electron energy (30. . .45 MeV), as well as, the data on absorbed energy of radiation in the targets of natural
composition are represented. The experimental results confirm the data of modelling. Main trends of realization of
the photonuclear method for isotope production and the necessary conditions of the increase of its yield are analysed.
Simulation Study of Compact Hard X-ray Source via Laser Compton Scattering
R. Kuroda, M.K. Koike, H. Ogawa, N. Sei, H. Toyokawa, K. Y.
Yamada, M.Y. Yasumoto (AIST) N. Nakajyo, F. Sakai, T. Yanagida
(SHI)
The compact hard X-ray source via laser
Compton scattering between high intensity
electron beam and high power laser beam
was developed at FESTA (The Femtosecond
Technology Research Association) project in
collaboration between AIST and SHI. According to completion of the project in March 2005, the compact hard X-ray
source is being transferred from FESTA to AIST to upgrade and to apply the system to biological and medical uses.
Our system consists of a laser-driven photocathode rf gun, two 1.5m-long S-band accelerator structures and a high
power Ti:Sa Laser system. This system can generate a hard X-ray pulse which has variable energy of 12 keV – 33 keV
with narrow bandwidth by changing electron energy and collision angle. Maximum X-ray photon yield at FESTA was
accomplished about 10 7 photons/s (@10Hz, MAX 33keV) in case of 165 degree collision angle. In the next phase, we
are planning to make the total system much compact using X-band or C-band accelerator structures with permanent