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P.116. A.M.Surma, Yu.M.Loktaev, V.N.Gubarev, R.R.Fekhretdinov (SUE "All-Russian Electro- technical Institute", Moscow, Russia) T.P.Svistelnikova, A.A.Stuk (Branch of FSUE "Karpov Institute of Physical Chemistry", Obninsk, Russia)

USE OF 2-8 MeV ELECTRON BEAM ACCELERATORS TO CONTROL ELECTROPHYSICAL PARAMETERS OF THE MULTI- LAYER SILICON STRUCTURES

For the last two decades electron and proton irradiation of the rectifying components (di- odes, thyristors, etc.) has become an integral part of the controlled technology used in manufacture of the fast-acting power semiconductor instruments. The attempts have al- ready been made to use the technology in fabricating low-frequency high-voltage power semiconductor instruments for decreasing deviation of the minority charge carrier life- time over large space silicon multilayer structures. Accordingly, the requirements to re- producibility and homogeneous irradiation over the silicon structure become more rigid in order to decrease a contribution of the technology into the net cost of the products. Sev- eral ways are proposed in the paper to increase the efficiency of radiation technologies used in fabrication of the power semiconductor instruments. The results are presented for the leading decrease of the minority charge carrier lifetime in the bulky regions of the sili-

con structures irradiated with electrons of Ee

2MeV.

Alexey Surma: surma@vei.ru

P.117. E.Levichev, V.Parkhomchuk, S.Rastigeev, A.Skrinsky, V.Vostrikov (Budker Institute of Nuclear Physics, Novosibirsk, Russia), M.Kumada (NIRS)

Carbon Ion Accelerator Facility for Cancer Therapy

A carbon ion or proton beams are a superior tool to x-rays in both physical and biological doses in treating a cancer. A carbon beam has an advantage in treating radiation resistant and deep-seated tumors. The main limitation of wide application is a high cost of facility. This problem can be solved by our proton and carbon ion accelerator facility proposal on the base of Cold Beam Synchrotron. The main feature of the facility is an application of electron cooling device. The ion beam is cooled down and the beam emittance and an en- ergy spread are decreased. The final high quality cold ion beam with small transverse emittance and momentum spread allows to decrease significantly the aperture of the syn- chrotron and components of high energy beam transfer lines.

Vladimir Aleksandrovich Vostrikov: v.a.vostrikov@inp.nsk.su

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