Dear Peter. Below you can find a file with preliminary results of TPC testing in hydrogen. Unfortunately the pressure inside of vessel is go down day per day because of leak of the valve. For instance, today pressure is 9.58 Bar. Please note, high voltage values indicated in figures have NOT corrected according to the pressure values. It means that high voltage 5.8kV will correspond to the HV=6.0kV under the pressure P=10Bar. To be sure that TPC has some "long time stability" (at list a few days) two days ago the TPC run started under HV=5.8kV with 90Sr. During this period pressure was changed between 9.7 and 9.6Bar. Till now TPC is running properly. This test will be finished by Friday - Volodja's leaving day. As one can see TPC can detect an electron tracks from 90Sr. Signal/noise ratio is more than 10. Of cause we have some quite serious questions for the long term stability TPC and would like to improve it. More detail report we will send you late. My best regards. Anatoly
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TPC-report_140505
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