Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Discussion for Keep Alive Source /Auxiliary Positron Source KURIKI Masao Hiroshima U. /KEK 1 10/25/2011 ILC Technical Baseline Review, 2011, DESY 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 eRTML (downstream), e- ML, and undulator. 2 10/25/2011 ILC Technical Baseline Review, 2011, DESY BDS DOGLEG and AUX SOURCE Electron Beam For Aux. Positron 3 10/25/2011 ILC Technical Baseline Review, 2011, DESY TGT, OMD, etc and Vault Aux. Positron Electron Beam For Aux. Positron 4 10/25/2011 ILC Technical Baseline Review, 2011, DESY 125 MeV Capture Accelerator, Beam separation and Dumps Aux. Positron (Injector Linac) 5 10/25/2011 ILC Technical Baseline Review, 2011, DESY 5 GeV Booster and BDS Optics Aux. Positron (5GeV Booster) 6 10/25/2011 ILC Technical Baseline Review, 2011, DESY Continued BDS and E+ transport past the MAIN 20 MW E+ DUMP Aux. Positron 7 10/25/2011 ILC Technical Baseline Review, 2011, DESY Separation of E+ Beam to DR and E- BDS to IR + E- RTML 8 10/25/2011 ILC Technical Baseline Review, 2011, DESY Concept of “Auxiliary” or “Keep Alive Source 1. RDR Keep Alive source: 10% nominal intensity. 1. Dedicated 500MeV e- linac 2. Dedicated e+ target (W or W-Re) and capture section. 2. SB2009 Auxiliary source: 2% intensity 1. Dedicated 500MeV e- linac 2. A common e+ target (Ti alloy) and capture with undulator. 3. Placed in BDS tunnel. 3. Is SB2009 Auxiliary source useful? 9 10/25/2011 ILC Technical Baseline Review, 2011, DESY 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 . 10 10/25/2011 ILC Technical Baseline Review, 2011, DESY 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). 11 10/25/2011 ILC Technical Baseline Review, 2011, DESY Mosaic target A target assembly consists from Ti W-Re and Ti-alloy. The target should be assembled symmetrically for smooth rotation. The rotation is controlled, so that electron electron hit W-Re part and photon hit Ti-alloy part. photon The target is compatible both for physics run with undulator and commissioning run with eauxiliary source, without target exchange. 10/25/2011 ILC Technial Baseline Review, 2011, DESY W-Re 12 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. 13 10/25/2011 ILC Technical Baseline Review, 2011, DESY