First beamtime at MePS after 15 month of break

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Due to the extension of the ELBE hall the cave 111b was open and was also extended. Thus, our last beam time was in September 2011. Now we are going to revitalize MePS again and prepare it for user operation.

2013-02-22_01 The MePS target ready for beam time.

2013-02-22_02 Electron beamline with last diagnostics

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2013-02-22_06 New beamline in Cave 111b. the left branch serves MePS

2013-02-22_07 Last beamline monitor before electrons hit the positron converter

2013-02-22_08 future beamline channel through MePS radiation screening

2013-02-22_09 New undulator for THz experiments

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2013-02-22_13 one of the quadrupole magnets in MePS beamline

2013-02-22_14 chicane for the entrance to MePS target

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2013-02-22_16 positron beamline coming from target and going to the lab through cable tunnel

2013-02-22_17 transport and steering coils along the positron beamline

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2013-02-22_20 preparing for beam time

2013-02-22_21 glass fibre supplying us the machine pulse

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2013-02-22_26 removal of a part of the lead shielding to find a short-circuit in the high voltage line to the einzel lense

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2013-02-22_32 short-circuit was found in a damaged coax cable (left on top of flange): white inner isolation was damaged due to the high radiation level

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2013-02-22_40 Wolfgang repairing the cable

2013-02-22_41 closing of radiation shield

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2013-02-22_43 our new office in the ELBE building

2013-02-22_44 the ELBE experimental hall

2013-02-22_45 control room for GiPS

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2013-02-22_48 Maik doing data analysis

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2013-02-22_50 ELBE control room

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2013-02-22_52 ELBE in Macro mode (5 Hz); channel 1: machine pulse; channel 2: pulse obtained from the moderator (@ 1 MOhm); pulse height about 2.5 V

2013-02-22_53 ELBE in cw mode (26MHz/16); beam current 8 µA; channel 1: MINT pulse; channel 2: pulse obtained from the moderator (@ 50 Ohm); pulse height Vpp=40 mV resulting in a count rate of 1400 cps

2013-02-22_54 timing device for buncher and chopper

2013-02-22_55 MePS control center

2013-02-22_56 magnetically screened PMT for lifetime measurements

2013-02-22_57 high voltage controlled still not from LabView

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2013-02-22_60 high-voltage control box

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2013-02-22_63 SPONSOR lab

2013-02-22_64 SPONSOR is a continuous slow-positron beam

2013-02-22_65 digital setup for CDBS

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2013-02-22_69 Sample holder with aperture in front. Aperture is used for beam alignment before experiment. It will be removed for lifetime measurement.

2013-02-22_70 sample preparation and mounting

2013-02-22_71 low-k sample on sample holder

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2013-02-22_73 sample holder is mounted

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2013-02-22_75 Buncher adjustment