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Recent results. Shinji Machida ASTeC/STFC/RAL 19 May 2011. Orbital period (Time of Flight) measurement. Data fits nicely as a parabola curve Empty circles are measurement, filled circles are after including correction of velocity. Orbit without acceleration.

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recent results

Recent results

Shinji Machida

ASTeC/STFC/RAL

19 May 2011

orbital period time of flight measurement
Orbital period (Time of Flight) measurement
  • Data fits nicely as a parabola curve
  • Empty circles are measurement, filled circles are after including correction of velocity.
orbit without acceleration
Orbit without acceleration
  • Each cell has one BPM between QD and QF.
  • 42 cells correspond to 1 turn.
  • Figures below show 10 turns results with 12.0 MeV/c equivalent momentum.

horizontal

vertical

orbit position vs momentum
Orbit position vs momentum
  • Calculate average and standard deviation of orbit measurement in the previous page.
  • Standard deviation is mostly determined by COD as well as initial mismatch of orbit.
cell tune without acceleration
Cell tune without acceleration
  • NAFF applied to consecutive 21 cells gives instantaneous cell tune over 10 turns.

horizontal

vertical

cell tune vs momentum
Cell tune vs momentum
  • Cell tune at each equivalent momentum calculated with NAFF shows momentum dependent tune.
orbit and hori tune with acceleration
Orbit and (hori) tune with acceleration
  • With rf, a beam is accelerated and horizontal orbit position and H and V cell tunes changes as a function of momentum.
  • Horizontal position (left) and horizontal tune (right).
serpentine channel acceleration 1
Serpentine channel acceleration (1)
  • By comparing phase information, longitudinal phase space can be reconstructed.

Momentum determined by H orbit

Momentum determined by H tune

serpentine channel acceleration 2
Serpentine channel acceleration (2)
  • By comparing phase information, longitudinal phase space can be reconstructed.

Momentum determined by V tune

beam centre oscillations
Beam centre oscillations
  • No significant effects of tune crossing.
  • Centroid oscillation amplitude does not grow much.
letter
letter
  • Results will be submitted to a journal letter shortly.