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Diamond Light Source Update Richard P. Walker

Diamond Light Source Update Richard P. Walker. Current Machine Status. Target Achieved Energy 3 GeV 3 GeV Beam current 300 mA 300 mA Machine Development 250 mA User Mode Emittance - horizontal 2.7 nm rad 2.7 nm rad - vertical 27 pm rad 4-50 pm rad ~ 27 pm in User Mode

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Diamond Light Source Update Richard P. Walker

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  1. Diamond Light Source UpdateRichard P. Walker

  2. Current Machine Status Target Achieved Energy3 GeV 3 GeV Beam current 300 mA 300 mAMachine Development 250 mA User Mode Emittance - horizontal 2.7 nm rad 2.7 nm rad - vertical 27 pm rad 4-50 pm rad~ 27 pm in User Mode Lifetime at 300 mA > 10 h ~ 18 h Min. ID gap7 mm 5-7 mmUser Mode, depending on ID Stability< 10% 2.5% (H), 7.5% (V) No feedback of beam size 0.5% (H), 1.7% (V) Feedback, 1-100 Hz & divergence 0.7% (H), 7.3% (V) Feedback, 1-1000Hz

  3. 12 Insertion Devices Operational • 10 in-vacuum undulators • 1 variable polarization APPLEII device • 1 3.5T superconducting wiggler

  4. Future Insertion Devices (i) • I04.1 • Short, ex-vacuum, permanent magnet device; under construction in-house, installation Dec. ’08/Jan. ’09. • I12 • Superconducting multipole wiggler, 4.2 T, contract with BINP. • FAT next week; installation Mar. ’09. • I20 • 2 x hybrid wigglers, W83, construction in-house; • installation Jun. and Aug. ’09 • I07 • Cryogenic Permanent Magnet Undulator (U17.7) contract with Danfysik. Installation end ’09. Spare in-vacuum U23 device installed as a temporary measure.

  5. Future Insertion Devices (ii) • I10 • 2 x APPLE II devices with 10 Hz polarization switching using 5-kicker scheme; engineering implications under study •  2 girder changes • I13 (L) • 2 x in-vac. undulators with “double mini-beta” optics proposed; • beam dynamics and engineering implications under study. •  1 or 2 girder changes • I09 (L) • Helical undulator + in-vac. CPMU, with “double mini-beta” optics proposed; beam dynamics implications under study. •  1 or 2 girder changes

  6. “Double mini-beta” optics for I13

  7. User-Mode Operations “Standard” operation: 250 mA maximum, 2 injections/day Aiming for 300 mA early next year – reliability more important than beam current.

  8. User-Mode Operations 3120 h in 2007, 92.4% uptime 4080 h in 2008, 94.8% uptime so far 4656 h in 2009

  9. User-Mode Operations

  10. User-Mode Operations

  11. User-Mode Operations

  12. So what’s going on with the RF ? • mostly cavity vacuum trips, associated with very rapid pressure rise and collapse of cavity volts • appear to be “conditioning events”, but mechanism not understood • conditions have been changing too much (beam current increases, cavity warm-up etc.) to correlate trips with anything For more information see Morten Jensen’s presentation at ESLS RF No. 12: http://www.diamond.ac.uk/Technology/RF/Agenda

  13. In-vacuum Undulator Minimum Gap Beam loss monitor counts at the IDs (red) and at the collimator (yellow) due to closing each ID individually to 5 mm gap IDs 2, 3 and 4 have significantly higher radiation losses at 5 mm gap compared to all 7 other in-vac IDs Why ? .. proximity to the collimators ?? Investigations ongoing

  14. Top-Up • First operation with external users, 3 days, Oct. 28-30th • No top-up failures, no beam trips due specifically to top-up

  15. Top-Up • Injection every 10 mins, typically 20-25 shots (single bunch) at 5 Hz • Current stability typically ± 0.5 % • (± 0.35% due to lifetime, 24 h at 250 mA) • Experience was positive - regular top-up operation from now on ! • Injection efficiency drift needs to be understood, and cured ….

  16. … thanks for your attention http://www.diamond.ac.uk

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