公开(公告)号：DE2342772A1

公开(公告)日：1974-12-19

申请号：DE2342772

申请日：1973-08-24

Applicant: RADIATION DYNAMICS

Inventor： THOMPSON JUN CHESTER C ,  OLSEN SEVERT E ,  LOBY RAYMOND J

IPC: H01T4/16 ,  H01T4/20 ,  H02H7/12 ,  H02H9/06 ,  H02M7/04 ,  H02M7/06 ,  H02M7/10 ,  H01L1/16 ,  H02M7/24

Abstract: A high voltage solid-state rectifier includes multiple series connected ac-compensated diodes and series buffer resistors in a stepped spiral stack. The stack is encased in a sectionalized faraday shield which provides 360 DEG isolation from external rf electrostatic fields and provides external capacitance grading along the stack. Spark gaps between shield sections prevent excessive voltage build-up due to electrical discharges and are arranged in line of sight of each other to permit the ultra-violet light produced from one spark gap firing to stimulate the firing of the other spark gaps. A trigger spark-gap derives its voltage from an inductance in series with the solid-state rectifier. Any electrical discharges which result in an excessive voltage appear initially across the inductance, firing the trigger spark gap which in turn initiates the other spark gaps to fire by ultra-violet stimulation.

公开(公告)号：FR2627626A1

公开(公告)日：1989-08-25

申请号：FR8816325

申请日：1988-12-12

Applicant: RADIATION DYNAMICS

Inventor： THOMPSON CHESTER C ,  LOBY RAYMOND J

IPC: H01J37/06 ,  G21K5/10 ,  H01J37/147

Abstract: Provided herein is an electro-magnetic field former for controlling charged particle trajectories in a scanning charge particle source including a pair of induction coils and C-shaped ferromagnetic yokes which are positioned in the air space between the particle source and a target at the target edges to normalize the angle of incidence of the particles relatve to the target and to deflect scattered particles into the target edges. Also provided is a field former controller to compensate for induced flux variations caused by an oscillating particle beam.