Beamtime of MePS (10.-14. June 2010)
Further continuation of beamline setup

2010-06-03_01 Maik and Marco filling Ge detector (60% efficiency) 2010-06-03_02 2010-06-03_03 Wolfgang and Andreas in Lab 111d 2010-06-03_04 Detector will be used for beam detection 2010-06-03_05 Wolfgang, Andreas and Maik 2010-06-03_06 Energy analyzer: 3 grids allow precise beam energy measurement (before mounting into the system) 2010-06-03_07 2010-06-03_08 2010-06-03_09 Arnold setting up the digital lifetime spectrometer for measurement of the time structure of un-bunched beam 2010-06-03_10 Marco setting steering coils; right: analog lifetime measurement 2010-06-03_11 digital (on top) and analog (NIM rack down) lifetime measurements are compared 2010-06-03_12 Network analyzer shows signal of DCM (differential current monitor) which is directly produced by the electron beam short before the beam passes the Be window at the end of the ELBE beam tube to hit our positron converter 2010-06-03_13 WinCC screen shows system control in cave 111b. Position of DCM (compare previous slide) is indicated 2010-06-03_14 Signal of DCM is taken from connector 9 2010-06-03_15 Sketch of possible chopper power amplifier using a radar tube (idea of Hardy) 2010-06-03_16 Scan of the positron beam over a 10mm aperture by the steering coils. Each peak corresponds to a single scanned line. 2010-06-03_17 Beam shape obtained this way. Right: raw data, left smoothed figure. 2010-06-03_18 Lab 111d 2010-06-03_19 RKR reviewing a diploma thesis 2010-06-03_20 Marco and Arnold analyzing the beam properties 2010-06-03_21 Control panels for energy and time properties of the positron beam 2010-06-03_22 Energy spectrum obtained by a countervoltage: sharp drop at 2000V (corresponds to beam transport energy) 2010-06-03_23 Arnold showing the time structure (peak with FWHM=2.7 keV) 2010-06-03_24 under the beam table... 2010-06-03_25 2010-06-03_26 HV ground for countervoltage 2010-06-03_27 2010-06-03_28 2010-06-03_29 Steerer voltage connection 2010-06-03_30 2010-06-03_31 2010-06-03_32 2010-06-03_33 self-made computer-driven constant current sources (up to 10A at 10V) for the steering coils 2010-06-03_34 The whole rack of the 30 constant current sources for the beam steerers 2010-06-03_35 current sources for the first transport coils 2010-06-03_36 2010-06-03_37 2010-06-03_38 ... just another scan... 2010-06-03_39 ...a VME module ...

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