E158 Milestone Experiment

1
E-158 Milestone Experiment

• 11/11/98 Status Review

2
Laser system slice pulse output

• 2 months, minimal maintenance
• 4 week lamp lifetime (for 2 jitter)
• 3 week lamp lifetime for 1.5 jitter.

3
Laser solid state pulsers

• Pulsers finally nearly ready (were due 7/20/98)
• Pulse shapes (from vendor) look good

4
Other laser issues

• Trigger drop-outs. Hardware? Software?
  Interference from the modulator? Problem is
  intermittent, very difficult to diagnose.
• Modulator electrical noise.
• Modulator Cable (OK for now).
• Pulsed Pockels cell driver (waiting for new TMUX
  unit from controls).

5
Laser Asymmetry Feedbacks (Mike Woods)

• Intensity asymmetry lt2x10-7 Meets experiment
  goals
• Stokes1 and Stokes2 working.
• Laser Position asymmetry feedback will be tested
  soon.
• Spot size asymmetry still needs to be tested.

6
Electron beam Asymmetry tests

• Electron gun / load lock expected to be ready
  last week of November
• RF BPM high voltage driver - underway. Can
  resonate the Pockels cell to reduce drive power
  to 500W (pulsed).
• RF BPM readout electronics simplified - use
  crystal radio detector.

7
Crystal Radio BPM

• Just use a square law detector (and optional
  resonant filter).
• Signals away from the carrier are suppressed
• Nearly as effective as a mixer and much simpler.

8
Project Cost Status

• Original Budget 150K.
• 92K direct costs through September.
• BIS information still difficult to interpret.
• Negative 8.5K charged from stores is listed!!!
• 6.8K charged in September - seems high - I
  cannot access breakdown
• Will just assume that the total is correct.

9
BPM system additional costs

• RF BPM system 34K
• Pockels Cells 8K (includes spare)
• RF Pulser labor 10K (Wild Guess)
• RF Pulser parts 5K
• 238MHz source 2K.
• Filters 3K
• Detectors 2K
• GADC 4K

10
Projected Budged

• Current Direct Costs 92K, 20K commitments
• Additional shop labor 15K (guess)
• BPM system additional components 16K
• Additional / Replacement optics 10K (variable)
• Total expected 153K. (original budged 150K)

11
Other Notes

• Costs will scale with the duration of the
  project. Critical path item is the electron beam
  availability.
• Asymmetry control remains the most critical
  problem - what do we do if we do not meet the
  milestone goals.
• Project should switch from construction to
  testing / optimizing at the end of December.