CLIC cost & power consumption issues Philippe Lebrun on behalf of the C&S WG CLIC Meeting 11 December 2009

Ph. Lebrun – CLIC meeting Main linacs are the cost drivers Direct Indirect impact CLIC 3 TeV cost estimate 2007 (H. Braun & G. Riddone) CLIC 3 TeV (per linac) Modules: Accelerating str.: 71406PETS: MB quadrupoles: 1996DB quadrupoles: CLIC 3 TeV (per linac) Modules: Accelerating str.: 71406PETS: MB quadrupoles: 1996DB quadrupoles: CLIC 500 GeV (per linac) Modules: 2124 Accelerating str.: 13156PETS: 6578 MB quadrupoles: 929DB quadrupoles: 4248 CLIC 500 GeV (per linac) Modules: 2124 Accelerating str.: 13156PETS: 6578 MB quadrupoles: 929DB quadrupoles: 4248 The main linacs –account for a large fraction of CLIC cost, –impact strongly on other capital (tunnel, infrastructure, services) and operation (electricity, cooling, maintenance) costs Very high, unprecedented number of components –constitute a major cost (and to some extent, feasibility) issue –will require novel solutions for manufacturing, installation, maintenance, reliability

Ph. Lebrun – CLIC meeting CLIC vs LHC series components Numbers, variants & production techniques Flexible cells, manual work Flexible workshops Automatic chains CLIC Quads CLIC TBM CLIC AS CLIC PETS AS quadrants AS discs

Ph. Lebrun – CLIC meeting Cost drivers & potential saving options Main and drive beam production Cost driverCost saving impact Cost mitigation optionAlternativeRisk/benefit of alternative Specific actions Damping ring wigglers: superconducting LNormal conducting Drive beam RF power generation M10 MW (peak power) klystrons More units: reliability vs industrial availability Drive beam phase and amplitude control LAlternative scheme under study Main beam bunch compressor BC2 deep underground L to MUse DB+PETS instead of klystrons BC2 close to ground level, before dogleg and turnaround Increase bending radius of turnaround to reduce CSR? Beam physics study, then CES comparison Turnaround magnetsLPermanent magnets Power consumption, Cost impact LOrder of 10 MCHF MOrder of 100 MCHF HOrder of 1 BCHF C&S WG review not completed!

Ph. Lebrun – CLIC meeting Cost drivers & potential saving options Two-beam modules [1/2] Cost driverCost saving impact Cost mitigation optionAlternativeRisk/benefit of alternative Specific actions Accelerating structure stacked disc construction HQuadrant constructionTechnical validation pending Industrial cost studies, prototyping Accelerating structure vacuum tank MSealed constructionLeakagePrototyping Production yield of accelerating structures M to HProduction control and testing Industrial prototyping & preseries production Replacement of 80 MV/m accelerating structures MReinstall and reuse 80 MV/m structures Maximum energy PETS on-off mechanismMDevelop and industrialize Drive beam quadrupoles: unprecedented number MAutomated manufacturing Customization to position in decelerator Allows series powering To be developed Specification from beam physics, industrial study Powering of drive beam quadrupoles MNovel powering scheme ("intelligent bus") Series powering (plus trim windings?) Reduce cabling, limit power consumption Specification from beam physics Reliability of power converters MHot sparesImproved availability of CLIC Specification from beam physics Cost impact LOrder of 10 MCHF MOrder of 100 MCHF HOrder of 1 BCHF

Ph. Lebrun – CLIC meeting Cost drivers & potential saving options Two-beam modules [2/2] Cost driverCost saving impact Cost mitigation optionAlternativeRisk/benefit of alternative Specific actions Corrector dipolesMUse radial displacement of quadrupoles Assess technical feasibility Active alignment systemHDevelop low-cost sensors and movers Reduce number of independant loops Assess technical feasibility Stabilization systemMDevelop low-cost sensors and movers Review need for hexapod vs tetrapod support of quadrupole Assess technical feasibility Support girdersMDevelop and industrialize non-metallic material construction Design common girder for main and drive beam Assess technical feasibility, favorable impact on cost of alignment and stabilization systems Industrial cost study Wake-field monitorsMDevelop low-cost electronics Review need for WFM in each structure Beam emittance control Beam loss monitor dynamic range MDuplicate BLMs?Machine protection issue Beam instrumentationMStandardize electronics and develop innovative cabling solutions Review number of instruments Beam emittance control Cost impact LOrder of 10 MCHF MOrder of 100 MCHF HOrder of 1 BCHF

Ph. Lebrun – CLIC meeting Cost drivers & potential saving options Interaction regions Cost impact LOrder of 10 MCHF MOrder of 100 MCHF HOrder of 1 BCHF C&S WG review not completed! Cost driverCost saving impact Cost mitigation optionAlternativeRisk/benefit of alternative Specific actions Final BDS for 500 GeVMReduced-length BDS would not fit in same tunnel Under study

Ph. Lebrun – CLIC meeting Cost drivers & potential saving options Infrastructure and services Cost driverCost saving impact Cost mitigation optionAlternativeRisk/benefit of alternative Specific actions Location of injector complex w r to main linacs LOptimize location for 135 m travel difference between e+ and e- Under study Tunnel cross-section increase MMainly imposed by transverse ventilation Transverse space, access to equipement Installed power and power consumption MPower distribution scheme Revised assessment of installed power and power consumption Tunnel ventilationMLimit power dissipation in air, reduce length of ventilation sector Cost impact LOrder of 10 MCHF MOrder of 100 MCHF HOrder of 1 BCHF C&S WG review not completed!

Ph. Lebrun – CLIC meeting Power 3 TeV Total 415 MW (H. Braun, 2008) By load typeBy PBS domain

Ph. Lebrun – CLIC meeting Power 3 TeV New iteration (K. Schirm, Nov 2009) [1/2] AC power distribution & conversion on site –Apply  = 0.9 throughout RF power flow –First iteration (C&S WG of ) shows substantial increase –Identified: increased pulse length in DB linacs, lower modulator efficiency ⇒ Check efficiency values applied throughout RF chain, grid-to-beam Magnets –Large increase in power of many magnet systems due to increase in Aperture (MB quads, DB turnarounds, DB quads) Field strength (DB quads) Current density (MB quads, DB quads) ⇒ Track « hidden » safety factors in beam physics requirements ⇒ Impose power limit/low current density to magnet designers (with additional benefit of indirect water cooling of coils) ⇒ Review DB quad powering scheme

Ph. Lebrun – CLIC meeting Power 3 TeV New iteration (K. Schirm, Nov 2009) [2/2] Instrumentation –Large increase in power: number of channels –Particularly damaging as power is dissipated in HVAC system ⇒ Innovative solutions for readout electronics, data transmission, cabling Infrastructure & services –Not yet reviewed –Previous values taken as percentage of installed capacity (H.B.) Experimental area –Previous value taken from CMS (H.B.) ⇒ Input needed from physics & detector WG ⇒ Work in progress, to be followed early 2010 ⇒ Different estimates required for different purposes –Overall efficiency comparison with ILC 500 GeV) –Sizing of AC power distribution –Sizing of water cooling & HVAC systems –Operational cost

Ph. Lebrun – CLIC meeting Summary Cost consciousness well established in CLIC technical working groups Cost drivers and cost reduction areas identified - as well as their interplay - analysis not yet exhaustive Analytical costing exercise under way by domain coordinators with input from technical system experts, in domains where technical baseline exists Cost studies by industrial companies, in particular for large-series components, useful for substantiating cost estimate New iteration of power consumption estimate started Feedback on cost and power provided to technical system design Cost and power consumption can only be finalized after freeze of configuration for CDR

Ph. Lebrun – CLIC meeting TeV

Ph. Lebrun – CLIC meeting GeV

28 MW Main beam injection, magnets, services, infrastructure and detector Dumps Main linac PETS Drive beam acceleration MW MW 1 GHz RF power MW Drive Beam Power MW 13.7 MW  plug/RF = 38.8 %  M =.90  A =.977  TRS =.98  T =.96 F  =.97 .96  D =.84 Drive beam power extr. Power supplies klystrons  RF/main = 27.7 %  tot = 6.8 %  S =.95  RF = MW 12 GHz RF power (2 x 101 kJ x 50 Hz) Main beam Wall Plug  K = MW Modulator auxiliaries MW AC power  REL =.93 aux = MW Power 3 TeV

9.75 MW Main beam injection, magnets, services, infrastructure and detector Dumps Main linac PETS Drive beam acceleration 61.5 MW 1 GHz RF power: 36.1 MW Drive Beam power: 33.5 MW 26.2 MW 13.7 MW  plug/RF = 38.8 %  M =.90  A =.977  TRS =.98  T =.96 F  =.97 .96  D =.84 Drive beam power extr. Power supplies klystrons  RF/main = 39.6 %  tot = 7.5 %  S =.95  RF = GHz RF power: 24.6 MW (2 x 25 kJ x 50 Hz) Main beam Wall Plug  K = MW Modulator auxiliaries 63.4 MW  REL = MW Power 500 GeV aux = 0.97