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FIZIKA B 2 (1993) 2, 83-90
 
MECHANICAL AND ELECTRICAL INNOVATIONS
IN THE DESIGN OF THE HORIZONTALLY MOUNTED
SUB-MeV VAN de GRAAFF ACCELERATOR
Work supported by Croatian Ministry of Science
NIKOLA GODINOVI�, JOSIP TUDORI�-GHEMO, IVO JER�I�,
MATKO JOSIPOVI�, LJUBOMIR KULU�I�
FESB, University of Split, R. Bo�kovi� b.b., 58 000 Split, Croatia
and
JAVOR �KARE
"Brodogra�evna industrija Split'', Put Supavla 21, 58 000 Split, Croatia
Received 28 May 1993
Revised manuscript received 23 July 1993
The construction of the insulating column of the horizontally mounted Van de Graaff
accelerator has been implemented using the new composite materials with the corresponding
mechanical and electrical characteristics. Three supporting bolts fix the equipotential
plates and the system exhibits vanishing vibrations and a negligible decline. The low
frequency stabilization of high direct voltage has been implemented controlling the spray
voltage by the thyristor transducer. The signal proportional to high voltage fluctuations
changes the thyristor triggering delay angle in the primary circuit of the spray
generator. The mathematical model predictions of the high voltage stability are confirmed
by the corresponding measurements. The achieved stability permits the proton implantation
experiments and it is a reliable basis for designing high frequency stabilization even at
very low energies.
UDC 539.1.07
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