Log entry time 21:27:29 on March 03, 2009

Entry number 264397

Summary for Mar 2 swing - Mar 3 Day

Awaiting recovery of machine until 12:00

Beam quality has improved significantly

Starting positron LHRS runs, doing Moller this evening

Running has been extended until 08:00, Monday March 16, 2009

Beam in Use

shift	ABU	BANU	BNA
2009/03/02 swing	0.0	0.0	8.0
2009/03/03 owl	0.0	0.0	8.0
2009/03/03 day	2.4	1.0	4.6
total	2.4	1.0	20.6

Main events/issues:

• Mar 2
  • Shift on standby since no beam will be received
  • Left Q3 current began fluctuating
• Mar 3
  • Take controlled access to repair Q3. Found no apparent cause, but after cleaning internal contacts the current seems stable.
  • Beam is restored around 12:00. Positive polarity runs underway.
  • BigBite deadtime seems to have gone up from 20% to 25% even though rates are the same. Setting T2 prescale to 2 from 1.
  • LHRS T3 trigger rate is 20x higher than negative polarity running.

  
  

Plans until day 3/5

• Moller, Evening March 3
• Continue positive polarity running until Day 3/4
• 06:30, go to controlled access for techs to swich LHRS polarity
• Finish as much 5 pass production as possible until beam studies Tuesday in Kin I, G, ... with goals of 100% accumulation.