Machine Studies 2006

• Recognized need for IP compensation due to injecting into collision (3/23)

  • Original design inspired by injection current limit of weak into strong beam
  • Use of closed beta bumps preserves optics outside IP

• Optimized IP knob coefficients using tunes and EXFR PB lifetime

  • Knobs 1 and 2: Tune tracker
  • Knobs 3-6: Use of closed pulsed bump preserves collision and IP optics, but ...
  • ... tests aperture only at 28E and 34E

• Superpose IP and LRBBI coefficients; find current limit

  • 8x3 90 mA 105 mA (3/23)
  • 8x4 120 mA 132 mA (4/5, later increased to 145 mA)