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Beam Commissioning Report: Observing Synchrotron Oscillations

In the brief summary of run #9 by Shinji Machida representing the beam commissioning team at ASTeC/STFC/RAL on September 21, 2010, aims included capturing a beam in a bucket to study synchrotron oscillations, understanding improvements by QD27, and establishing a nominal lattice with optimized QD/QF ratio. The team changed the rf frequency, synchronized it with the revolution frequency, and successfully injected a beam into the center of the rf bucket. Measurements were conducted to calculate the slippage factor, determine momentum acceptance limits, and plan the next steps for further analysis.

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Beam Commissioning Report: Observing Synchrotron Oscillations

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  1. Brief summary of run #9 (16-18 September) Shinji Machida on behalf of the beam commissioning team ASTeC/STFC/RAL 21September 2010

  2. Aims • Capture a beam in a bucket and observe synchrotron oscillations. • Understand “improvement” by QD27. • Establish nominal lattice with less QD/QF ratio.

  3. rf frequency • Change rf frequency from 1.3 GHz to 1.301 GHz. • Synchronize with revolution frequency. • Can inject a beam into the centre of rf bucket.

  4. Slippage factor • By measuring ToF at 18.5 and 16.5 MeV/c, slippage factor can be calculated. dt/t =\eta dp/p \eta = dt/dpp/t = 7.7 e-3

  5. rf voltage • Synchrotron oscillation frequency tells rf voltage a beam sees • With 1 MV, oscillation period should be 14 turns. • Observed period is 20 turns. • Therefore, a beam only sees 0.5 MV.

  6. Momentum acceptance • Large amplitude synchrotron oscillation is not allowed especially when a beam is decelerated. • Momentum acceptance limit is -1.3 MV (equiv.) • More on positive side.

  7. Next step • Measurement of individual phase. • Measurement of closed orbit and correction. • Measurement of injection orbit.

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