Time-of-flight neutral particle analyzer and calibration

Harris, W. S.; Garate, E. P.; Heidbrink, W. W.; McWilliams, R.; Roche, T.; Trask, E.; Zhang, Yang
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F313
Academic Journal
A time-of-flight diagnostic has been implemented on the Irvine field reversed configuration (IFRC) to obtain an energy distribution function from charge-exchanged neutral hydrogen. The diagnostic includes a 13 cm radius slotted disk rotating at 165 Hz in vacuum which chops the emitted neutrals at a rate of 26 kHz. In situ timing verification was performed with a dc xenon discharge lamp with an uncertainty less than 100 ns for a 38 μs chopping period. Energy calibration was accomplished with a singly ionized lithium source in the range of 300–1500 eV, achieving an average energy uncertainty, ΔE/E, of 0.11. The diagnostic has measured neutrals in the range of 20–80 eV from the IFRC and the corresponding energy distribution function has been obtained.


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