An overview of instrumentation for MgB₂ based current lead test

As a development part of current leads (CL) in the SST-1, a cryogenic test facility has been prepared to evaluate the performance of indigenously developed MgB₂ based current leads. During the performance of current leads at cryogenic condition various instruments have been utilized for the precise measurement and control. These instruments include temperature, pressure, mass-flow, liquid helium level, vacuum, pressure drop. Apart from these, different control devices such as regulatory valves, heater and vacuum pumps are also used. This paper describes the selection, mounting techniques and behavior of these instruments for the better output. These instruments have been linked to a dedicated Schneider make PLC system to acquire the signals. During the current lead test, each instrument has been performed satisfactory and reliable in the low temperature (4.5 K and 80 K) as well as in the excitation mode. (author)