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Updated: May 28, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Detection efficiency vs. cathode and anode separation in cylindrical vacuum photodiodes used for measuring x-rays
T K Borthakur1, N Talukdar, N K Neog
1Centre of Plasma Physics-Institute for Plasma Research, Tepesia, Sonapur, Assam, Pin-782 402, India. tkborthakur@yahoo.co.uk
Abstract:
A qualitative study on the performance of cylindrical vacuum photodiodes (VPDs) for x-ray detection in plasma focus device has been carried out. Various parameters of VPD such as electrode's diameter, electrode's separation, and its sensitivity are experimentally tested in plasma focus environment. For the first time it is found experimentally that the electrode-separation in the lateral direction of the two coaxial electrodes of cylindrical VPD also plays an important role to increase the efficiency of the detector. The efficiency is found to be highest for the detector with smaller cathode-anode lateral gap (1.5 mm) with smaller photo cathode diameter (10 mm). A comparison between our VPD with PIN (BPX-65) diode as an x-ray detector has also been made.
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