MBE-4, a Heavy Ion Multiple-Beam Experiment

Diagnostics for induction accelerators

“…A four-beam ion induction linac named MBE-4 (10) was built and operated from 1986 to 1991. This machine accelerated four parallel beams of cesium+ to nearly 1 MeV while increasing the current from 4 x 10 mA to nearly 4 x 90 mA.…”

“…Moreover, at high beam powers the design of a beam dump that will survive the beam becomes as issue. A multipurpose device was developed for diagnosing the 50 MeV, 10 14 The beam dump/diagnostic system (24) developed for the ATA acceleratofr consisted of a series of carbon plates whose collective thickness totaled approximately 1.5 ranges at 50 MeV. The dump was designed to dissipate up to 175 kW of average power.…”

Developments in Accelerators for Heavy Ion Fusion

“…The interdigital support method described in Ref. 21 creates a small but not wholly insignificant octupole term which affects the equilibrium orbit, and a dodecapole term that in principle (but probably not in practice) could cause emittance growth [24].…”

The Effect of Focusing Field Nonlinearities in MBE-4 on Transverse Beam Dynamics

“…This experiment will accelerate high current heavy ion beams through an alternating gradient electrostatic focusing system. 2 We examine here the effect of focusing field nonlinearities on the transverse dynamics of the transported beams. Such field nonlinearities result from a ELECTRODES (9), 1.584-DIA.…”

“…Those studied here can be divided into three classes: (I) imperfections in the field of a single quadrupole, (2) nonlinearities due to the asymmetry of the complete electrode array with respect to the beam of interest, and (3) end effects of the quadrupoles.…”