On the way to measuring gbar with AEgIS

The main goal of AEgIS is to measure the fall of antihydrogen in the Earth's gravitational eld, which is a direct test of Einstein's Weak Equivalence Principle. This gravity measurement requires the production of a pulsed and cold antihydrogen beam whose vertical de ection will be observed in a set of moire de ectometer gratings. The antihydrogen detector was previously built in order to measure the produc- tion and temperature of the antihydrogen atoms and for establishing the formation of the antihydrogen beam. This detector consist of scintillating bers that are con- nected to Multi-Pixel-Photon-Counters (MPPCs) which are further connected to readout electrons. For a total of 816 MPPCs, the bias voltage was tested. It was observed that one channel out of the 816 was not functional. Additionally, in the current setup antiprotons, which are used to produce anti- hydrogen, are cooled to 4 K using electrons. A uorescence spectroscopy technique that uses C􀀀 2 molecules to more efficiently cool antiprotons is being studied. An av- erage eective percentage of uorescent light received by a detector having an area of 1 mm2 when light having wavelength 2500 nm interacts with the C􀀀 2 molecules was calculated to be approximately 30 %.