The pbar production beam for the AD

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The pbar production beam for the AD

• PLAN
• 1. Principle
• 2. Implementation
• 3. Results

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1. Principle

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2. Implementation

• Hardware
• each cavity has its own DDS driven by a main
  clock on h128,
• the clock train is tagged at fREV (removes
  problems of phasing h128 with h1)
• DDS automatically synchronize on the distributed
  fREV when arriving at an integer h
• the azimuthal position of a cavity is entered on
  the front panel of its DDS which automatically
  sets the correct phase for any harmonic
• only standard control equipment is used (GFAS and
  linked timings)
• a beam phase loop operates on the correct
  harmonic number all along the batch compression
  (Digital Phase Discriminator)

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Beam control
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3. Results 1998
2.51012 ppp (1998)
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3. Results 1999
1.51013 ppp (1999) with synchronization and
bunch rotation before ejection