October 18, 1997

Vacuum conditioning (outgassing from the vacuum chamber by synchrotron radiation) was carried out.

Beam dumps happened at 7:52 AM and 0:54 PM due to an rf trip (but not serious).

An integrated current of 10.0 A*hrs was gained from 8:37 AM (Oct. 17) and 9:07 AM (Oct. 18). Average beam current was 408 mA during this 24-hours.

Beam current and beam lifetime in the afternoon.
Vacuum conditioning is under way.

Vacuum pressures at 3:38 PM. Beam current: 457 mA, average pressure: 1.69 nTorr.

New beam position monitor system for the beam-transport line (BT line).

This new instrumentation is used to monitor the beam positions at five locations in the BT line during beam injections. Five stripline electrodes, which were newly installed, are used to pickup the beam signals. The beam position monitor near a PM9-screen (where the dispersion function is about 5 meters) is particularly useful to watch the energy of injected beams. A lower-right trace shows a trend plot of the energy fluctuation with an energy scale of +-0.2% deviation (if one assumes that the beam-position fluctuation at this location is due to the beam energy deviation alone).

Closed-orbit distortion. Beam positions in the storage ring are measured using a new BPM system.