ELECTRON BEAM TEMPERATURE MEASUREMENTS AT THE FERMILAB MEDIUM ENERGY ELECTRON COOLER*

The Fermilab Recycler ring employs an electron cooler to store and cool 8.9-GeV anti-protons. The cooler is based on an electrostatic accelerator (Pelletron) working in an energy-recovery regime [1]. Several techniques for determining the characteristics of the beam dynamics have been investigated. Beam temperature measurements using optical transition radiation (OTR) [2],[3], in conjunction with a Pepper-pot have been made at several settings of the upstream optics of the machine. Without temperature the pepper-pot hole images would have sharp boundaries. A finite temperature makes these boundaries broader. Thus, comparison of the ratios of the hole image boundaries and intensities is a measure of the beam temperature. In this paper we report the results so far obtained using this technique