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Discussion for Keep Alive Source /Auxiliary Positron Source

Discussion for Keep Alive Source /Auxiliary Positron Source. KURIKI Masao Hiroshima U. /KEK. KAS/APS central region integral. KAS/APS share a common target, capture, booster. 500 MeV linac for KAS/APS is in e- BDS tunnel.

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Discussion for Keep Alive Source /Auxiliary Positron Source

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  1. ILC Technical Baseline Review, 2011, DESY Discussion for Keep Alive Source /Auxiliary Positron Source KURIKI MasaoHiroshima U. /KEK

  2. KAS/APS central region integral • KAS/APS share a common target, capture, booster. • 500 MeV linac for KAS/APS is in e- BDS tunnel. • KAS/APS operation conflicts to maintenance in e- BDS, e- RTML (upstream), and e- DR. • KAS/APS is compatible with maintenance for e- RTML (downstream), e- ML, and undulator. ILC Technical Baseline Review, 2011, DESY

  3. ILC Technical Baseline Review, 2011, DESY BDS DOGLEG and AUX SOURCE Electron Beam For Aux. Positron

  4. ILC Technical Baseline Review, 2011, DESY TGT, OMD, etc and Vault Aux. Positron Electron Beam For Aux. Positron

  5. ILC Technical Baseline Review, 2011, DESY 125 MeV Capture Accelerator, Beam separation and Dumps Aux. Positron (Injector Linac)

  6. ILC Technical Baseline Review, 2011, DESY 5 GeV Booster and BDS Optics Aux. Positron (5GeV Booster)

  7. ILC Technical Baseline Review, 2011, DESY Continued BDS and E+ transport past the MAIN 20 MW E+ DUMP Aux. Positron

  8. ILC Technical Baseline Review, 2011, DESY Separation of E+ Beam to DR and E- BDS to IR + E- RTML

  9. Concept of “Auxiliary” or “Keep Alive Source • RDRKeep Alive source: 10% nominal intensity. • Dedicated 500MeV e- linac • Dedicated e+ target (W or W-Re) and capture section. • SB2009 Auxiliary source: 2% intensity • Dedicated 500MeV e- linac • A common e+ target (Ti alloy) and capture with undulator. • Placed in BDS tunnel. • Is SB2009 Auxiliary source useful? ILC Technical Baseline Review, 2011, DESY 10/25/2011

  10. KAS/APS yield • 500 MeV driver with 0.4X0 target makes ~2% intensity. • The same driver with 3X0 target makes ~20% intensity. • 0.4X0 Ti alloy and 4X0 W has same thickness . ILC Technical Baseline Review, 2011, DESY

  11. Two Scenarios • Start up e+ source is very important in MD phase. • In the initial phase, 3X0 W-Re instead of 0.4X0 Ti alloy improves the e+ intensity. • 500 MeV single bunch S-band accelerator (30m) can generate 20 % intensity e+ beam. • The target can be replaced when undulator is ready for the commissioning. KAS becomes a small backup with a few % intensity. • Could W-Re (or W) and Ti alloy be implemented in a same target ? (Hybrid). Target Replace Mosaic Target ILC Technical Baseline Review, 2011, DESY

  12. Mosaic target W-Re Ti • A target assembly consists from W-Re and Ti-alloy. • The target should be assembled symmetrically for smooth rotation. • The rotation is controlled, so that electron hit W-Re part and photon hit Ti-alloy part. • The target is compatible both for physics run with undulator and commissioning run with e- auxiliary source, without target exchange. electron photon ILC Technial Baseline Review, 2011, DESY

  13. Summary • Any conflict with other system in operation? Does it work really as KAS/APS? • Is 2% bunch intensity enough? • Target replace after commissioning phase seems to be efficient and reasonable. • Mosaic target can be a technical solution to avoid the target exchange. ILC Technical Baseline Review, 2011, DESY

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