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EMMA with 4 Modules: Commissioning Similar to Full Ring

EMMA with 4 Modules: Commissioning Similar to Full Ring. J. Scott Berg Brookhaven National Laboratory 11 March 2010. Outline. Experimental tasks Injection Closed orbit and tunes Time of flight Lattice correction Cavity phasing Advantages and Disadvantages. Injection.

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EMMA with 4 Modules: Commissioning Similar to Full Ring

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  1. EMMA with 4 Modules:Commissioning Similar to Full Ring J. Scott Berg Brookhaven National Laboratory 11 March 2010

  2. Outline • Experimental tasks • Injection • Closed orbit and tunes • Time of flight • Lattice correction • Cavity phasing • Advantages and Disadvantages

  3. Injection • Same problem as full ring • Can’t precisely determine closed orbit • More on next slide • Don’t care if kicker pulse is too long • Allows more time to get right

  4. Closed Orbit and Tunes • Can’t find truly “closed” orbit • Pretend cells are identical • Pseudo-closed orbit minimizes cell-to-cell variation • Tunes: again, pretend cells are identical • NAFF on cell-by-cell data (few cells) • Least squares to sinusoidal

  5. Time of Flight • Can’t do two passes by same object • Could use BPMs • Systematic offset (small) since two different BPMs • Still get relative variation (vs. energy) • Accuracy may be challenging • Would need two (preferably identical) scopes

  6. Lattice Correction • Could get rough idea of tune and time of flight vs. energy • Could correct lattice to desired configuration using this • Correction not precisely what we want: need to check against truly closed orbit • Likely very close, however • Maybe correct cell-to-cell variation?

  7. Cavity Phasing • Can’t set cavity frequencies: redundant with phase when only one pass • Can attempt cavity phasing exercise • Power cavities, adjust phase to minimize orbit deviation downstream • Won’t give final settings: frequency must be set with closed ring • Probably waste of time, since real algorithm must do frequency and phase

  8. Advantage: Get Started Sooner • Can begin getting machine in shape now • Major injection problems identical • Can wait for better solution for kicker supply • Finding closed orbit slightly different • Find closed orbit parameters vs. energy • At least good guesses • Bring lattice closer to desired state • Experiments not possible in ring (Shinji’s talk)

  9. Disadvantage: Delay • Work needed for partial ring delays work needed for full ring. Only partial overlap. • Algorithms and procedures similar but not identical to those for full ring • Repeat for full ring, but will start close • Costs in time/money • Additional work in construction • Some repetition of experimental work • Time better spent preparing for full ring?

  10. Disadvantage: Delay • Do we demonstrate anything interesting? • No significant acceleration possible • At best almost get linear parameters vs. energy • Experiments that are not possible in full ring (Shinji’s talk) • Could we realistically have anything for IPAC?

  11. Summary • Can begin work needed for full ring • Would be done imperfectly, some (maybe small) repetition needed in full ring • There are costs associated with the delay • Advantage of early start unclear (haven’t seen Rob’s talk at time of writing…) • But partial ring may give additional experimental possibilities

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