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

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

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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 3

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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 4

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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 5

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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? 6

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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 7

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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) 8

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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? 9

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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? 10

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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 11

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