From: Anatoliy Krivchitch To: Alexei Vorobyov , Peter Kammel , petitjean , "Maev, Evgeny" , "Semenchuk, Gennadi G." CC: Anatoli Krivchitch Subject: status of PC2 Dear colleagues. I would like to inform you about today status of PC2 and TPC activity at PNPI. For a moment we can clearly state that the technology of the copper deposition on the quartz glass frames has been principally improved. It means that now the adhesion between copper layers and the quartz glass is so high that the contact copper/glass is broken under the load more than 2000 g per 1.5*6 mm of soldered zone. This force is at list 10 times more than we need for both PC2 and TPC. Moreover, the adhesion between copper layers and the quartz glass is so high that the copper layer is ripping away with a piece of glass from the frame material if the load exceeds the critical values. The quality of the copper layer on the quartz glass frames allows to solder on the same place of deposited zone more than 10 times under the temperature 320 C degree. The melting point of our solder is 240 C degree, that allows to heat PC2 (or TPC) in the hydrogen vessel up to 150 C degree without degradation of detector performances. Right now the following electrodes have already produced for PC2 : - four anodes (see pictures P1010050, 053 and 055); - four cathodes (see pictures P1010051 and 049). Four additional cathodes will be ready during next week. Our target is to assemble two PC2 (X/Y). One - for the vessel, second - spare. We have started the prototyping of the TPC frames. This is not simple task but now we already got two full scale cathode frames where two copper layers have been deposited on top/bottom sides of the frame. See pictures P2180090 and 094. Preliminary tests showed that the quality of deposited layers are also nice It allows us to state now that we are ready to develop technology to produce TPC detector for our collaboration. We should be grateful if collaboration would support these our efforts as it was preliminary discussed at PSI in December last year. My best regards. Anatoli.