First GiPS spectrum (lifetime spectrum obtained as projection of AMOC spectrum to lifetime axis)

We solved the ground loop problem of the detector sysrem at the slow positron beam

First sample to be measured by GiPS (Gamma-induced Positron Spectroscopy): pure, annealed iron

Andreas Wagner is mounting the ioron sample to the position in cross point of all 6 detectors

Left: vacuum tube for holding the sample; Middle: BaF detector; right: Ge detector

Vacuum system is going to be closed

The whole detector system in the nuclear physics cave 109

Ge detector is sourrounded by BGO detectors in anticoincidence to reduce Compton events in Ge detector (not used in our experiments)

Constant fractions being used

A part of the (analog) electronics

One of three racks ...

Gamma beam line entering cave 109

Vacuum system...

Instruction for use of vacuum system

A part of the crew: Marco Jungmann, Arnold Krille, Gerhard Brauer, Wolfgang Anwand, Andreas Wagner (from left)

Fast electronics ...

Door is going to be closed

Back in slow positron lab ...

An SCA was the solution for most of electronic noise problems

Ronald Schwengner with us in corridore in front of cave 109

Andreas playing with modules

RKR also there

Red light: ELBE beam running, door must stay closed

Yellow light: beam down, door may be opened

Re-adjustment of BaF to aline the single rates of all detectors to be roughly equal

The other BaF detector

Automatic LN2 filling system of Ge detectors

Look into the cave

Part of electronic system

Ronald and Andreas waiting for the ELBE beam to appear

4 single rates (2 Ge and 2 BaF detectors on top) and 4 coincidence rates

First lifetime GiPS spectra of iron are growing

Marco and Maik installing a board in slow positron lab

A mouse was observed in the ELBE hall

LN2 supply

The board boing to be ready soon...

The sample holder for liquids (here water) has two thin caton foils

... the same holder

Holder inside the sample tube

in the meantime: board finished

The gamma beam opening (center) and 2 Ge detectors (behind copper attenuator plates) and 2 BaF outside

sample in middle of wire ring to avoid the plastic tube

Iron sample within wire ring holder

Small champaign party for first positron spectra at ELBE

RKR giving some explanations

The ELBE crew

Prof. Möller from Inst. of Ion beam Physics

Andreas Wagner

Jörg Pawelke and Tom Cowan talking

RKR and Peter Michel