Main Linac Layout – Two variants for two different types of sites

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Main Linac Layout – Two variants for two different types of sites. M. Ross Project Advisory Committee Review 13 December, 2012 KEK. Mandate from RDR. Chapter 7.1 (The Scope of the Engineering Design Phase) - PowerPoint PPT Presentation

Transcript of Main Linac Layout – Two variants for two different types of sites

KILC 12 and the TDR

M. Ross

Project Advisory Committee Review13 December, 2012KEKMain Linac Layout Two variants for two different types of sites2012-12-13GDE PAC Review (M. Ross, SLAC)1Mandate from RDRChapter 7.1 (The Scope of the Engineering Design Phase)

design the conventional construction and site-specific infrastructure in enough detail to provide the information needed to allow potential host regions to estimate the technical and financial risks of hosting the machine, including local impact, required host infrastructure, and surface and underground footprints

2012-12-13GDE PAC Review (M. Ross, SLAC)22Global Value EngineeringCivil construction is a cost driver (27% Value estimate)R & D results must support a cost-optimized linac layout solution balancing: Underground constructionUtilitiesHigh level RF generationHLRF distribution Key issues:Cost containment remove second tunnel boringAccessibility of HLRF equipment during operation availability and energy overheadSafety egress2012-12-13GDE PAC Review (M. Ross, SLAC)3Linac Conventional Facilities and HLRFOutlineSuperconducting Linac SchematicTwo Main Linac Layouts:Mountainous RegionCivil ConstructionHLRF Distribution, Detailed schematicFlat TerrainCivil Construction HLRF Distribution, Detailed schematicCryogenicsAvailability / Overhead / OperationsRadiation exposure and Heat Load / AC Power2012-12-13GDE PAC Review (M. Ross, SLAC)4Superconducting linac schematic:

2012-12-13GDE PAC Review (M. Ross, SLAC)53 basic segments:38 meters: 26 cavities + one quad / corrector magnet package154 meters: Cryostat vacuum unit = 4 (or 3) ML units2 kilometers: Cryogenic circuit = cold segment((Linac Lattice

Lattice functions for last cryo-unit (2.008 km) with post-linac collimation2012-12-13GDE PAC Review (M. Ross, SLAC)6one quad / 38 metersTwo Types of sites considered:Mountainous Region (MR)(e.g. Japan)Features:No access to surface above tunnelLittle surface construction Underground construction technology: blasting preferred in hard rockTunnel depth variationFlat Terrain (FT)(e.g. CERN or Fermilab)Features:Access to surface above tunnelSurface construction Underground construction: TBM preferred in soft (CERN) or moderately hard (Fermilab) rockLittle tunnel depth variation

2012-12-13GDE PAC Review (M. Ross, SLAC)77Mountain RegionFlat Terrain2012-12-13GDE PAC Review (M. Ross, SLAC)8Two Design Solutions for HLRF and Utilities:self-contained main linac HLRF system with limited surface construction and limited surface connectionsDistributed Klystron (DKS)Similar to deep twin-tunnel RDR (2007)tightly-linked main linac system with extensive surface construction and HLRF distribution systemKlystron Cluster (KCS)Quasi-new technology based on over-moded transmission of very high power RFR & D program

Linac Designs (cryomodules/optics) equivalent

Candidate site in northeastern Japan Tohoku Mountain Region

(Photo taken100 km north of Sendai.)The ILC alignment would be 50 to 400 meters below these hills. 2012-12-13GDE PAC Review (M. Ross, SLAC)9Candidate site in western Japan Sefuri Mountain Region

(Photo taken 30 km from Fukuoka; ~80 km east of Nagasaki). The ILC would be 50 to 800 m below these hills.2012-12-13GDE PAC Review (M. Ross, SLAC)10MR Linac + HLRF (Japan)

2012-12-13GDE PAC Review (M. Ross, SLAC)11Similar to 2007 RDR layout1.5 ML Units39 cavities: 9 8 9 9 4 // 4 9 9 8 9 //

Distributed Klystron Scheme DKSVar. H-hybridVar. Power dividerPressure windowMR Civil Layout

2012-12-13GDE PAC Review (M. Ross, SLAC)12Six access tunnels / access halls3 each per linacTunnels typically 1 km long, 10% gradeDetails depend on site alignment Access halls ~ 180 x 20 m

MR Linac tunnel cross-section:2012-12-13GDE PAC Review (M. Ross, SLAC)13Personnel can occupy klystron area during operationRadiation analysis later in presentationCross-over paths for egress (500 m) 11 m wide x 5.5 m highdimensions in mm

13MR Linac: Modules, Strings and HLRF2012-12-13GDE PAC Review (M. Ross, SLAC)14

1701 ML cryomodules378 ML Klystrons total for both linacsFT Linac + HLRF (CERN/Fermilab)

2012-12-13GDE PAC Review (M. Ross, SLAC)15Power distribution using over-moded waveguide (WC1890 @ 2 bar gauge pressure)Low loss, (8.5%/km), high power transmissionSimilar technology to X-band (NLC / JLC)clusters of klystrons housed in surface buildings

Klystron Cluster Scheme KCSCTO Circular Tap-OffCylindrical (WC) waveguide ~480 mmFT Civil construction

2012-12-13GDE PAC Review (M. Ross, SLAC)162x more shafts required:6 shafts per linac (3 Large)Large Caverns 52 x 10 mmax WC1890 len.