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Radiation hard helium gas ionization chambers capable of operating in vacuumat temperatures ranging from 5K to 350K have been designed, fabricated andtested and will be used inside the cryostats at Fermilab's SuperconductingRadiofrequency beam test facility. The chamber vessels are made of stainlesssteel and all materials used including seals are known to be radiation hard andsuitable for operation at 5K. The chambers are designed to measure radiation upto 30 kRad/hr with sensitivity of approximately 1.9 pA/(Rad/hr). The signalcurrent is measured with a recycling integrator current-to-frequency converterto achieve a required measurement capability for low current and a wide dynamicrange. A novel scheme of using an FPGA-based time-to-digital converter (TDC) tomeasure time intervals between pulses output from the recycling integrator isemployed to ensure a fast beam loss response along with a current measurementresolution better than 10-bit. This paper will describe the results obtainedand highlight the processing techniques used.

Cryogenic loss monitors with FPGA TDC signal processing