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We present the results of observation of the Geminga pulsar carried out in the TeV energy band during the 6 year period spanning 2000–2006 using the Pachmarhi Array of Cherenkov Telescopes (PACT). A long stretch of data, new computer codes and the “Tempo” package have been used in the present analysis. We have searched for evidence of pulsed emission of γ -rays from the Geminga pulsar using the post-glitch pulsar elements obtained by Jackson and Halpern from X-ray/ γ -ray satellite data. We do not see any significant evidence for pulsed emission from the Geminga pulsar at a threshold energy of 825 GeV. In this paper we present our results on the light curve in the TeV energy band, set an upper limit on the time averaged flux of γ -rays, and compare our results with other ground based observations.

We have designed, prototyped and characterized a High-Voltage Digital-to-Analog Converter (HV–DAC) with a dynamic range of 600 V. When configured as a series voltage drop element in a High-Voltage (HV) distribution system, the HV–DAC can be used in high-energy physics experiments where individual high-voltage control of many channels is needed. The design and performance of the HV–DAC and a prototype two-channel programmable HV distribution system are presented here.