Studies of the low voltage power supply for a highly segmented fast detector

The experiments at the Large Hadron Collider are upgrading
their detectors for the coming High Luminosity run. Powering the on
board electronics of the highly segmented tracking detectors is a
challenge because of the stringent requirements on location, space
constraint, fine segmentation, radiation and magnetic field
tolerance, thermal loss, etc. Similar issues will be relevant for
the future colliding beam experiments, also. This paper reports
early studies of the Low Voltage Power Supply for the upgrade of the
Outer Tracker detector of the Compact Muon Solenoid experiment. The
proposed power chain uses point of load DC-DC converters. The
studies, with simulations and experimental measurements, have
identified a number of critical issues related to the voltages and
currents of the DC-DC converters under different operating
conditions. A few constraints on the design of such a system have
been identified and in some cases remedial measures to circumvent
such constraints have been suggested.

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