A first prototype of the Muegamma drift chamber (DC) was built and tested in a particle beam at PSI in October 2000.

The chamber was first tested in the lab:

Then the chamber was put into a dipole magnet in the PiM1 area at the PSI ring accelerator:

Data were taken using pions, electrons and muons at varying momenta:

MEG Home Page
P.-R. Kettle and S. Ritt, Nov 7th, 2000