Speaker
Description
The chopper pulsed power system at LANCE is a high speed, fast rise device which
performs chopping operations in the medium energy beam transport. The chopper consists
of a negative and a positive pulse modulator which work synchronously to deliver pulses to
slow wave structures in the beamline. In the beamline, the pulse voltages sum in the
electric field which deflects H- beam under strict timing control and patterns.
The beam pattern is essential for experimental control at WNR and Lujan which perform
neutron research based on spallation and time of flight operations. Recently, issues with
high levels of dark current were discovered at end user stations. The dark current is related
to unintended beam passage through the chopper. This work describes the introduction of
~5ns pulse delay lines into the chopper system which have eliminated the dark current
issues, but are challenging to modify since they are in the high voltage area. A new
galvanically isolated system consisting of AFBR-0553Z-ND and versatile link fiber is
proposed to simplify the process.
Funding Agency
Work was performed under the auspices of the US Department of Energy by Triad National Security, LLC, under contract 89233218CNA000001
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