Design and noise model for CCD-based, time-resolved PHA measurements

A CCD pulse height analysis system is considered for the measurement of electron temperature on the Pegasus Toroidal Experiment. The first-generation CCD/PHA system will have one spatial point and obtain seven time points with a time resolution of 2.4 ms. Time resolution is achieved by shifting the exposed rows of the CCD behind a masked off portion of the chip during the plasma discharge. Criteria for valid photon detection are developed to account for pulse pileup effects and maximize count rate. Error analysis and Monte Carlo calculations indicate that the CCD/PHA system should achieve typical uncertainties to <5% of the deduced temperature.