November 4-7, 1997

November 4 , 5 , 6 , 7

November 4

• User run started in this morning !
• After adjusting the SR beam axes (9:01-9:51 AM), we started the operations for users.
• We had a beam dump at 11:48 AM due to an interlock action with a Q-magnet power supply. See below.
• We had another beam dump at 4:58 PM due to an rf trip (interlock action due to large reflected rf from cavity #1). See below.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  9:52 AM	339.0 mA	582 minutes	197 A*minutes	0.38 nTorr	205.0 A*hours

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

Change in the COD (closed orbit distortion) when we had a beam dump at 11:48 AM.
Our new beam-position monitor (BPM) system can measure the COD very fast, in every 10 ms. This figure shows that the beam positions started to move about 100 ms before the beam dump. This function is very useful to diagnose machine troubles. (At this time, the cause of the beam dump was due to a magnet power-supply trouble).

Change in the COD when we had another beam dump at 4:58 PM.
At this time, the beam dump was caused by an rf trip. No beam-position movement was observed before the beam dump.

November 5

• User run.
• A problem in one of the beam shutters (BBS of BL-27) was fixed (5:07 - 5:27 PM).
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:01 AM	394.4 mA	539 minutes	213 A*minutes	0.405 nTorr	215.3 A*hours

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

November 6

• User run.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	382.2 mA	468 minutes	179 A*minutes	0.369 nTorr	222.0 A*hours

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

November 7

• User run.
• Operation status in this morning:
  

  Time	Beam current	Beam lifetime	I*tau	Average pressure	Integrated current
  10:00 AM	376.5 mA	592 minutes	223 A*minutes	0.383 nTorr	228.9 A*hours

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