Abstract
Readout electronics is developed for a prototype time-of-flight (TOF) ion composition spectrometer for in situ measurement of the mass/charge distributions of major ion species from 200 to 100 keV/e in space plasma. By utilizing a constant fraction discriminator (CFD) and time-to-digital converter (TDC), challenging dynamic range measurements were performed with high time resolution and event rates. CFD was employed to discriminate the TOF signals from the micro-channel plate and channel electron multipliers. TDC based on the combination of counter and OR-gate delay chain was designed in a high-reliability flash field programmable gate array. Owing to the non-uniformity of the delay chain, a correction algorithm based on integral nonlinearity compensation was implemented to reduce the time uncertainty. The test results showed that the electronics achieved a low timing error of < 200 ps in the input range from 35 to 500 mV for the CFD, and a time resolution of ~ 550 ps with time uncertainty < 180 ps after correction and a time range of 6.4 μs for the TDC. The TOF spectrum from an electron beam experiment of the impacting N2 gas further indicated the good performance of this readout electronic.
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The authors are grateful for the help and discussion of collaboration teams from Hefei National Laboratory for Physical Sciences at Microscale and CAS Key Laboratory of Geospace Environment (USTC).
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This work was supported by the National Key Scientific Instrument and Equipment Development Projects of the National Natural Science Foundation of China (No. 41327802) and China Mars Project.
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Yang, D., Cao, Z., Hao, XJ. et al. Readout electronics of a prototype time-of-flight ion composition analyzer for space plasma. NUCL SCI TECH 29, 60 (2018). https://doi.org/10.1007/s41365-018-0390-4
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DOI: https://doi.org/10.1007/s41365-018-0390-4