EXPFRIEI"NTAL STUDY OF LONG COUPIXD EFLIX RT;SOMATCR

Experimental tests of a coupled normal tempera- ture low 6 helix resonator with six-half-wavelength are described. The frequency shift and dynamic instability of the resonator are studied experimentally. The mecha- nical vibration caused by ponderomotive effect has been controlled. This resonator can run stably at a RF power of 50 KW , frequency of 27 MHz, duty factor of l/6, and the maximum voltage gain is more than 1.1 MV. Some measures have been taken to increase the stability of the helix. The resonator tested is a model for heavy ion booster following a small van de graff accelera- tor. *