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Abstract

In a MEQALAC a number of parallel beams is accelerated simultaneously by an RF field. Divergence and space-charge blow-up of the beam is suppressed by application of a series of electrostatic quadrupoles of alternating polarity. Such a device is useful for exit energies below 1 MeV/amu. In the proof-of-principle MEQALAC presently available at FOM four He ion beams are accelerated to 115 keV. Then the ratio of exit velocity and speed of light is beta = 10-2. The 40-MHz RF field is provided by a resonator cavity containing 20 accelerator gaps. Power required to excite the unloaded cavity is approximately 600 W. We present transmission measurements on injected beams with currents ranging from 1 to 8 ANGSTROEM. A maximum current of 2.2 ANGSTROEM per channel has been accelerated. Our results are consistent with space-charge limited currents calculated in the so-called smooth approximation. A design for a MEQALAC for acceleration of Li ions to 500 keV is presented.

Additional information

Authors: HOPMAN H J, FOM-INSTITUTE FOR ATOMIC AND MOLECULAR PHYSICS, AMSTERDAM (THE NETHERLANDS);VAN AMERSFOORT P W FOM-INSTITUTE FOR ATOMIC AND MOLECULAR PHYSICS, AMSTERDAM (THE NETHERLANDS), FOM-INSTITUTE FOR ATOMIC AND MOLECULAR PHYSICS, AMSTERDAM (THE NETHERLANDS)
Bibliographic Reference: 14TH SOFT CONFERENCE, AVIGNON (FRANCE), SEPT. 8-12, 1986 VOL. 1, PP. 653-658 1895 P., 1986, VOL. 1 AND VOL. 2, ISBN 0 08 034935 8 WRITE TO PERGAMON PRESS, HEADINGTON HILL HALL, OXFORD, OX3 0BW (UK), PRICE: UKL 220 (FOR BOTH VOLS.)
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