Stroboscopic injection/extraction scheme for SuperBF

1
Stroboscopic injection/extraction scheme for
SuperBF

• I.A.Koop, BINP, Novosibirsk, Russia

Frascati Workshop, March 16-18, 2006
2
Version 1. Damping Ring Filling Pattern(INFN
Roadmap Report, 20 Dec 2005)
Injection/extraction of train of 10000 bunches

• E2 GeV damping ring
  energy
• ?6500 m ring
  circumference
• n10000 number of bunches/ring
• finj/extr120 Hz inj/extraction
  rate
• fcollisions1.2 MHz average collision
  rate
• Tcooling8.3 ms cooling time

Frascati Workshop, March 16-18, 2006
3
Main Difficulties of Train by Train Collision
Scheme

• Parasitic crossings are spaced only by 0.3 m
• Too short time between subsequent collisions (2
  ns). Makes difficult use TOF-technic for particle
  identification.

4
Principle of Stroboscopic Injection/Extraction
Scheme

• Repetition frequency of kicker pulses slightly
  differs from the multiple of revolution frequency
• As a result bunch passes a kickers location with
  a slip relative to a pulse moment
• Each bunch after injection makes, say, 384 turns
  in a damping ring before being extracted
• Kicker pulse duration time is shorter compared to
  the bunch spacing

5
Repetitive stroboscopic injection/extraction of
single bunch.

• Tkick1.3 ns kicker pulse duration
  time
• ?0.6 m (2 ns) RF wave
  length
• ?384 ? (768 ns) kicker pulses
  period
• n38428110753 number of RF buckets
• ?n? 6451.8 m ring circumference
• finj/extr1.3 MHz kicker pulses
  frequency
• Trevolution21.506 mks revolution time
• t s4.16 ms damping time
• Tcooling8.3 ms cooling time

Frascati Workshop, March 16-18, 2006
6
Conclusion

• Stroboscopic scheme provides injection/extraction
  of single bunch, what probably will be needed for
  SuperB
• Technical problems and difficulties should be
  analyzed in further studies