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SNS visit 18-22 November 2013 K Hanke, B Mikulec*, JL Sanchez-Alvarez, JF Comblin, F Chapuis*

SNS visit 18-22 November 2013 K Hanke, B Mikulec*, JL Sanchez-Alvarez, JF Comblin, F Chapuis* o bjective was to see a machine with H- injection in real day-to-day operation, find out what the issues are, frequency and nature of problems, operating model, etc. * photos!.

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SNS visit 18-22 November 2013 K Hanke, B Mikulec*, JL Sanchez-Alvarez, JF Comblin, F Chapuis*

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  1. SNS visit 18-22 November 2013 K Hanke, B Mikulec*, JL Sanchez-Alvarez, JF Comblin, F Chapuis* objective was to see a machine with H- injection in real day-to-day operation, find out what the issues are, frequency and nature of problems, operating model, etc. * photos!

  2. Machine and beam parameters, accelerator physics challenges, in comparison to Linac4 (K. Hanke) • Injection process, hardware, … (B. Mikulec) • Operation and procedures (F. Chapuis) • Controls, diagnostics, tools (J.-F. Comblin for J.L. Sanchez) • Main problems and sources of down time (J.-F. Comblin) • each part 10’, room for questions

  3. Accelerator Complex

  4. Main Machine and Beam Parameters • rep. rate 60 Hz, one injection every 16.66 ms • number of turns injected into ring: 1000 • the actual cycle within this basic period is only 1 ms • revolution frequency 1.045883 MHz • beam energy nominal 1.0 GeV, presently running slightly below that (932 MeV) due to limited modulator power (capacitor problems + overheating); energy upgrade to come (linac); will go up to 1.3 GeV by installing 9 more cryo-modules, space left in the linac tunnel for more cavities • beam power 800-900 kW Linac4: 0.8 Hz (up to 2 Hz) energy 160 MeV pulse length 400 us mean pulse current 40 mA beam power 5.1 kW

  5. Source & LEBT • source: 2 RF power supplies (2MHz and 13MHz) • 2.5 MeV H- ions • chopper: 2 devices: in the LEBT and in the MEBT; they said that they would not even need the second one, only if full beam has to be removed (extinction factor of 1st one ~10-4-10-5) Linac4 source: RF volume + surface max. repetition rate 2 Hz extraction voltage 45 kV RF frequency 2 MHz max. RF power 100 kW max. beam current 80 mA

  6. Source & LEBT

  7. RFQ • RFQ: old one gives some problems (bad transmission ~60-70%); unclear why; new one had just arrived operating RFQ new RFQ had just arrived

  8. RFQ note the length!

  9. Linac • normal conducting linac gives occasional problems (flashovers, vacuum windows weak point) • super conducting linac perfectly stable Linac4: warm linac smoke events!

  10. Ring • only accumulating and bunching, no acceleration • emittance is not an issue • magnets are DC • RF 2 harmonics (H1 = 1.05 MHz; H2=2.10 MHz) • ferrite cavities • 4 cavities (2 running in H1 mode, 1 spare H1, 1 running in H2 mode) • H1 mode gives bunch structure • H2 mode to avoid peak intensity in the bunch • 13 extraction kickers (+1 hot spare) all pulsing together, 200 ns gap provided by the choppers for the extraction kicker rise-time

  11. Ring (building) power supplies RF cage comparable to the PSB building, but all new and clean RF, power: one-expert systems…

  12. Thank you!

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