June 13, 2007 Global Design Effort 1 ILC Effort at SLAC RDR > EDR Nan Phinney SLAC/GDE

June 13, 2007 Global Design Effort 2 RDR – a major effort in 06/07 Original Schedule was complete draft by Nov 06 but cost re-optimiation forced delays Drafts due to editors in late Dec 06 ‘Critical’ sections approved by EC at Beijing in Feb 07 and released Complete draft of all sections was released Apr 1, 07 except Executive Summary & EDR chapter still refining graphics, updating costs, references International Cost Review held May 24/25 in Orsay Final release for FALC 7/11 & ILCSC 8/15 with Executive Summary, Detector Concept Report

June 13, 2007 Global Design Effort 3 RDR Matrix Matrix of Area Systems and Technical Systems to develop design and cost estimate International representation in all working groups SLAC contributions in red RDR Management group: Nick Walker, Tor Raubenheimer, Kaoru Yokoya, Ewan Paterson, Wilhelm Bialowons, Peter Garbincius, Tetsuo Shidara

June 13, 2007 Global Design Effort 4 SLAC role in RDR RDR Chief Editor – NP with co-editors Toge (KEK), Walker (DESY) + major help from Bharadwaj, Tenenbaum SLAC was ~ only contributor to e- Source, RTML, Dumps, Installation SLAC was lead author for those 4 sections + e+ Source, Linac, BDS, OPS, Mod, Klys, rf distr’n SLAC was major contributer to costing for magnets, e+, e- & rf sources, dumps, CFS, install’n SLAC provided Systems Integration & graphics support

June 13, 2007 Global Design Effort 5 RDR Design Changes Central Injector proposed and coordinated by Paterson with SLAC e-, e+ sources, RTML, BDS area leaders January 06 Baseline

June 13, 2007 Global Design Effort 6 Central Injector January 07 RDR Configuration Damping rings now centrally located in common tunnel e- source, e+ 5 GeV linac, DR all located 10 m above BDS for early commissioning during linac installation

June 13, 2007 Global Design Effort 7 Central Injector > DR Current schematics have tunnels vertically offset

June 13, 2007 Global Design Effort 8 Tuneup Dumps (220 kW each) Ring To Main Linac: Schematic RTML was completely redesigned for Central DRs now the longest system in the entire ILC

June 13, 2007 Global Design Effort 9 In linac tunnel, follows curvature from gravitational equipotential 38 m quad spacing, 45° FODO cell except in vertical arcs RTML Return Line Transport low emittance beam

June 13, 2007 Global Design Effort 10 Control System Design SLAC proposed new standard for controls ATCA – Advanced TeleCommunications Architecture Cost effective platform for High Availability SLAC/UIUC collaboration on test prototype XFEL is adopting ATCA Detectors interested too

June 13, 2007 Global Design Effort 11 EDR Phase SLAC will likely lead e-, BDS, RF sources & Linac design but expect others to take over e+ and RTML SLAC will lead Installation planning CFS study shallow site, provide liaison to AS Critical R&D e- source, RF sources, BDS (previous talks) DR electron cloud (M. Pivi is WP leader) DR kickers (2 projects) High Availability Power Supplies & Diagnostics Beam Dynamics/Wakefield Simulations (SciDaq)

June 13, 2007 Global Design Effort 12 Very High Priority DR R&D Lattice design for baseline positron ring Lattice design for baseline electron ring Demonstrate < 2 pm vertical emittance Characterize single bunch impedance-driven instabilities Characterize electron cloud build-up Develop electron cloud suppression techniques Develop modelling tools for electron cloud instabilities Determine electron cloud instability thresholds Characterize ion effects Specify techniques for suppressing ion effects Develop a fast high-power pulser WP WP WP WP WP WP "Very High" priority items divide into 6 Work Packages A. Wolski - S3

June 13, 2007 Global Design Effort 13 Multi-pronged program Simulations (SLAC, KEK, LBNL) Secondary Yield studies Test sample chamber in PEP-II Chambers with fins to trap e- E-cloud R&D Program Mauro Pivi

June 13, 2007 Global Design Effort 14 SEY test station in PEP-II LER Manipulator at 0 o position PEP-II LER e+  Manipulator at 45 o position Samples location inside beam line Isolation valves (2) ILC tests, M. Pivi et al. – SLAC

June 13, 2007 Global Design Effort 15 SEY test chamber samples - TiN Secondary Yield after two months of conditioning in PEP-II LER SEY recontaminationSEY before/after conditioning SEY increases slightly if sample is left under vacuum following conditioning

June 13, 2007 Global Design Effort 16 LER#1 XPS Before installationXPS After exposure in PEP-II LER for 2 months (e dose 40mC/mm^2) Carbon content is strongly reduced after conditioning with synchrotron radiation + electrons + ions in PEP-II LER. This is completely different from laboratory tests with electron (only) conditioning where carbon crystals actually grow. Surface analysis: Carbon content decrease X-ray photon spectroscopy ILC tests, M. Pivi et al. – SLAC

June 13, 2007 Global Design Effort 17  M. Pivi – L. Wang – T. Raubenheimer - P. Raimondi, SLAC. Mar 2006  M. Pivi – L. Wang – T. Raubenheimer - P. Raimondi, SLAC. Mar 2006 Layout of the clearing electrodes in ILC DR BEND vacuum chamber +100V clearing electrodes suppress electron cloud buildup E-cloud Clearing Electrodes

June 13, 2007 Global Design Effort 18 System availability studies Design of high availability hardware (SLAC, LLNL) Kickers, Power supplies, diagnostics, and control system General control system design (with ANL, FNAL, …) Fast (redundant) kicker for DR High Availability Design Modular 4 of 5 power supply with auto-failover

June 13, 2007 Global Design Effort 19 TESLA Cavity Imperfection Study Omega3p model (SciDaQ) 1st band 6th pair2nd band 6th pair Actual cell shape differs from the ideal due to fabrication errors, stiffening rings, frequency tuning process deformed cavity Black – design Red/Blue – after cell deformation (#4, …)

June 13, 2007 Global Design Effort 20 Summary RDR SLAC had a major role in the design of all area systems, cost optimization and costing SLAC led the editing and authored > 1/3 of the sections Critical R&D SLAC has a major role in e- sources, simulations, RF - modulators, klystrons, distribution & couplers, e- cloud mitigation, DR kickers, BDS, MDI, ATF-II EDR SLAC leads e- source, BDS, RF sources, Linac design, Installation planning, System Integration