Abstract
A Cs ion-beam transport experiment is in progress to study beam behavior under extreme space charge conditions. A five-lens section matches the beam into a periodic electrostatic quadrupole FODO channel and its behavior is found to agree with predictions. With the available parameters (?200 keV, ?20 mA, ??n ? 10-7 ? rad-m, up to 41 periods) the transverse (betatron) oscillation frequency (?) can be depressed down to one-tenth of its zero current value (?o), where ?2 = ?2o - ?2p/2, and ?p is the beam plasma frequency. The current can be controlled by adjustment of the gun and the emittance can be controlled independently by means of a set of charged grids.
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