The positron beamline seems to work well. The observed positron intensity is close to a level at which experiments can be performed. The intensity will be increased in the near future by some planned modifications of the microtron.
The microtron is in line for a tune-up. This will consist of a replacing the circulator in the RF
waveguide, and installing cooling in the pulse transformer tank and modulator cabinet.
The changes can all be made at a very moderate cost.
These modifications should give a larger and wider pulse, up to 10mA/1µs, plus an increase in
the repetition rate, up to 25Hz, all of which is desired in connection with positron production. No
changes will take place until the end of this electron run, since we cannot risk not having a
microtron beam, even for a few days.
The new injection beamline was the subject of a small meeting last week. It has been modified
a little since then, and a plan of the beamline will be posted in our meeting room, next to the
control room, later this week. Comments are welcome!
10/3 1998 NH+SPM