November 22-30, 1997

November 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30

November 22

• User run.
• We found that a workstation for the beam position monitor was down at 9:01 AM. The workstation was reset at 9:00 PM.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	379.1 mA	741 minutes	281 A*minutes	0.253 nTorr	319.2 A*hours

Beam current (blue trace) and lifetime (red) around the clock.

November 23

• User run.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	382.9 mA	761 minutes	291 A*minutes	0.250 nTorr	325.8 A*hours

Beam current (blue trace) and lifetime (red) around the clock.

November 24

• Machine study.
• Study on the low-emittance optics (90 and 105 degrees/cell) was carried out.
• We succeeded to store the beam current of 400 mA under the both 90 degrees and 105 degrees/cell optics.
• We obtained the beam filling rate of about 0.7 mA/sec under the 105 deg. optics (injection repetition: 12.5 Hz).

Beam profile under the new optics (105 degrees/cell). Beam current: 397 mA. Observed at the beamline BL-21.	Beam profile under the usual optics.

Result of the tune survey. We changed the phase advance from 90 to 105 degrees per cell.

Beam current (blue trace) and lifetime (red) during this study.
The maximum beam current of 400 mA was stored at 6:19 PM (under 90 deg. optics) and 3:04 AM, Nov. 25 (under 105 deg. optics).

November 25

• We had a maintenance work from 9:00 AM to 5:00 PM.
• A trouble with the undulator #19, which happened on Nov. 18, was recovered.
• It took a lot of time to inject the beam in the evening (injection started at 5:02 PM and finished at 6:12 PM) due to a bad condition of the linac.

Beam current (blue line) and lifetime (red).

November 26

• User run.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	379.6 mA	640 minutes	243 A*minutes	0.268 nTorr	339.6 A*hours

Beam current (blue trace) and lifetime (red).

November 27

• User run.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	378.7 mA	774 minutes	293 A*minutes	0.260 nTorr	346.1 A*hours

Beam current (blue trace) and lifetime (red).

November 28

• User run.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	377.4 mA	842 minutes	318 A*minutes	0.254 nTorr	352.8 A*hours

Beam current (blue) and lifetime (red) today.

November 29

• User run.
• We had a weak earthquake at 9:40 AM, but there was no troubles.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	382.2 mA	842 minutes	322 A*minutes	0.253 nTorr	359.5 A*hours

Beam current (blue trace) and lifetime (red) today.

November 30

• User run.
• It took a little longer time to inject beams in the morning (channel closed at 9:00 AM and injection started at 9:52 AM) due to a software trouble.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:10 AM	398.3 mA	843 minutes	336 A*minutes	0.243 nTorr	366.2 A*hours

Beam current (blue trace) and lifetime (red) today.