December 1-7, 1997
December 1 , 2 , 3 , 4
, 5 , 6 , 7
December 1
- Machine study.
- Study on the low-emittance optics (105 degrees/cell)
was carried out. This included the correction on the optical functions
(betatron and dispersion functions etc.), the single bunch operation and
the measurement of beam emittance.
- We also tested a new control system for multipole wiggler
#13 (MPW#13) in the midnight.
Beam current (blue trace) and lifetime (red
trace) today.
December 2
- User run.
- Operation status in this morning:
| Time |
Beam current |
Beam lifetime |
I*tau |
Average pressure |
Integrated current |
| 10:00 AM |
343.1 mA |
780 minutes |
268 A*minutes |
0.317 nTorr |
376.0 A*hours |
Beam current (blue) and lifetime (red) today.
December 3
- User run.
- We had beam dumps two times (1:39 AM and 8:24 AM) due
to a bad condition with a bending-magnet (BM) power supply.
- We inspected the BM power supply from 6:00 to 6:50 PM.
It seemed that the trouble was caused by a switching noise of chiller (for
the control circuits), and then, we took temporary measures.
Beam current (blue) and lifetime (red) today.
December 4
- User run.
- Operation status in this morning:
| Time |
Beam current |
Beam lifetime |
I*tau |
Average pressure |
Integrated current |
| 10:00 AM |
392.5 mA |
853 minutes |
335 A*minutes |
0.255 nTorr |
388.2 A*hours |
- We had fractional losses of beam by 93 mA (at 10:22 PM)
and by 26 mA (at 11:39 PM). This was probably due to trapping of dust in
the beam.
Beam current (blue) and lifetime (red) today.
December 5
- User run.
- Operation status in this morning:
| Time |
Beam current |
Beam lifetime |
I*tau |
Average pressure |
Integrated current |
| 10:00 AM |
382.6 mA |
914 minutes |
350 A*minutes |
0.236 nTorr |
394.3 A*hours |
Beam current (blue) and lifetime (red) today.
December 6
- User run.
- Operation status in this morning:
| Time |
Beam current |
Beam lifetime |
I*tau |
Average pressure |
Integrated current |
| 10:00 AM |
380.4 mA |
929 minutes |
353 A*minutes |
0.238 nTorr |
401.2 A*hours |
- We had an earthquake at 3:42 PM which resulted in a beam
dump (due to a safety interlock action of a shielding door SD-NE).
Beam current (blue) and lifetime (red) today.
December 7
- User run.
- Operation status in this morning:
| Time |
Beam current |
Beam lifetime |
I*tau |
Average pressure |
Integrated current |
| 10:00 AM |
380.6 mA |
942 minutes |
359 A*minutes |
0.237 nTorr |
408.3 A*hours |
- We had an earthquake at 0:07 PM, but there was no problem.
Beam current (blue) and lifetime (red) today.