Main INDEX
Monthly INDEX
PREV
NEXT
User name Hansen
Log entry time 00:07:31 on February 9,2000
Entry number 33176
keyword=Shift summary
This was a fairly uneventful shift. Beam arrived around 16:00 and we commenced
tuning the intrinisic beam size using harp scans. This took approximately two
hours until 18:00. The final intrinsic beam size achieved was approximately
95x95 um (sigma_x times sigma_y). We then turned the beam raster on and
checked the raster size with both harp scans and spot++, resulting in apprixmately
4x4 mm (spot++). At 18:30, we began data taking for kinematics #25.
During the shift, we collected approximately 4.5M raw events for these
kinematics, bringing the total collected to 16.5M. It was decided that we
will continue at these settings unil we reach 20M events.
One item of concern was the beam current, which began dropping from
95 uA initially to 85 uA during the shift. After discussion with MCC, we
decided to ask for an increase of the source laser power if the current should
drop below 80 uA. Thismay occur during the next shift.
The target density is lower than normal due to gas loss earlier in the
day. No gas was added to the target during this shift, but there are
plans to do so at an opportune time later.
Ole Hansen