Analysis and Mitigation of Pulse-Pile-Up Artifacts in Plasma Pulse-Height X-ray Spectra

Plasma

article

Taosif. Ahsan¹  Charles P. S. Swanson²  Chris Galea³  Sangeeta P. Vinoth²  Tony Qian²  Tal Rubin²  Samuel A. Cohen² 

[1] Physics Department, Princeton University, Princeton;Princeton Plasma Physics Laboratory, Princeton University, Princeton;Princeton Fusion Systems

关键词: X-ray;    pulse pile up;    energy analyzers;    plasma;    2-photon;    dead time;    count rate;   

DOI  :  10.3390/plasma6010006

学科分类：泌尿医学

来源: mdpi

【 摘 要 】

Pulse pile-up in pulse-height energy analyzers increases when the incident rate of pulses increases relative to the inverse of the dead time per pulse of the detection system. Changes in the observed energy distributions with incident rate and detector-electronics-formed pulse shape then occur. We focus on weak high energy tails in X-ray spectra, important for measurements on partially ionized, warm (50–500 eV average electron energy), pure hydrogen plasma. A first-principles two-photon pulse-pile-up model is derived specific to trapezoidal-shaped pulses; quantitative agreement is found between the measurements and the model’s predictions. The model is then used to diagnose pulse-pile-up tail artifacts and mitigate them in relatively low count-rate spectra.

【 授权许可】

CC BY