Speaker
Description
We report on a new radiation-hard beam current monitor system based on work originally done to develop timing planes for future collider detectors. In contrast to sensors based on wall currents or toroid inductance, we make use of electric field induced by the electromagnetic vector potential of the beam current as it passes near or through a transmission line (TL), arranged with its dominant TEM or TE10 fields aligned with the current, thus directly coupling to TL modes. For Mu2e, we utilized a TEM parallel-plate TL geometry, since the requirements included measuring the structure of the bunch over ~200ns time scales. We present the design and results of simulated and realized sensors now deployed in the Mu2e beamline. In addition, inspired by this and prior work, we also investigate the use of broadband mm-wave dual-ridge waveguide as a means of measuring beam current substructure of nanosecond bunches down to the tens of picosecond level.
Funding Agency
US Department of Energy, High Energy Physics Division.
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