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Beam Time in September 2011: measuring low-k layers

2011-09-26_01 High-voltage module 2011-09-26_02 2011-09-26_03 2011-09-26_04 2011-09-26_05 2011-09-26_06 2011-09-26_07 2011-09-26_08 2011-09-26_09 Screened converter in Cave 111b 2011-09-26_10 Cave 111b 2011-09-26_11 Jörg mounting high-voltage modules 2011-09-26_12 Andreas and the pre-vacuum ... 2011-09-26_13 sample holder 2011-09-26_14 2011-09-26_15 2011-09-26_16 2011-09-26_17 Heiko made the high-voltage module 2011-09-26_18 2011-09-26_19 SQRT (2) ... 2011-09-26_20 Controlling the high voltage. 2011-09-26_21 2011-09-26_22 Andreas checking the buncher electronics and Marco preparing for the beam 2011-09-26_23 Buncher 2011-09-26_24 Wolfgang screwing... 2011-09-26_25 Faraday cup of sample chamber 2011-09-26_26 2011-09-26_27 2011-09-26_28 2011-09-26_29 2011-09-26_30 2011-09-26_31 2011-09-26_32 Bended tube instead of EXB to prevent backscattered positrons to return to the sample 2011-09-26_33 2011-09-26_34 2011-09-26_35 2011-09-26_36 2011-09-26_37 2011-09-26_38 2011-09-26_39 2011-09-26_40 MePS in operation; PMT behind the sample 2011-09-26_41 2011-09-26_42 2011-09-26_43 Wolfgang in front of a spectrum; count rate very high after changing the moderator 2011-09-26_44 about 6000 counts/s with 30 microA (instead of 1 mA which is the maximum current) 2011-09-26_45 Direct current monitor signal on the moderator foil (yellow: machine pulse) 2011-09-26_46 PMT 2011-09-26_47 First series measured at MePS without chopper: hardly any artefacts but still too bad resolution.