Proposals of high efficiency accelerator components from AAA Green-ILC WG H. Hayano, KEK

AAA (Advanced Accelerator Association in Japan) Green-ILC Working Group Discussion and proposals of Green-ILC technologies from Laboratories and Industries ( 22 industries from AAA ). Green-ILC technologies : High efficiency accelerator devices, New concept of energy management of ILC, Recovery and re-use of waste energy, Use of renewable energy, … AAA Green-ILC WG will make a proposal report to LCC/ILC for the use in detail ILC design.

ILC Power consumption RF power Cryogenics NC Magnet Conventional Facility Improvement candidate 500GeV-ILC Beam power 500GeV-ILC RF power : Klystron, klystron focus P.S., Modulator, WG-loss, etc Cryogenics: Compressor, pumps, heat-load to LHe, etc Beam Dumps (heat) NC magnet: Coils, Cables, power supply, etc Conventional Facility: power line loss, cooling loss, lighting, air-conditioning, etc Power Summary in TDR

Proposal Pickup from AAA Green-ILC WG in 2014 (1) Helium compressor efficiency improvement (2) HTS cable for primary power transmission (3) High efficiency cryogenics for HTS cable (Maekawa Co.) (Fujikura Co.) (Maekawa Co.) * HTS : High Temperature Superconductor

(1) Helium compressor efficiency improvement (Maekawa Co.)

Helium refrigerator Compressor Oil Separator After-Cooler Expansion turbine Expansion Valve SC cavities Cold-Box Low-press gas, medium temp High-press gas, high temp High-press gas, low temp High-press gas, medium temp Low-press gas, low temp Low-press Liquid, low temp

Gas Oil Compressor Oil Separator After-Cooler Oil Separator 5% of Heat extracted From after-cooler 95% of Heat extracted From Oil-cooler -> can be re-used

Compressor power reduction by using Adsorption Refrigerator [AdRef] Characteristics; 1.non-CFC gas, but use water 2. Low temperature heat exhaust 3. Economy operation ( only water pump) 4. Easy maintenance 5. Safe operation

Cooled water by Adsorption Refrigerator [AdRef] Cooled water Heat extraction Cooling water Oil separator 1 st compressor 2 nd compressor After cooler Oil cooler Inter-cooler Electric power divide add Adsorption refrigerator

TOTAL Gas Temperature down (310K -> 280K) Then Compressor power reduce. 7% saving

(2) HTS cable for primary power transmission (Fujikura Co.)

Y-High-Tc ( HTS ) cable element Product Cable structure ( formed by copper structure ) Stabilized layer Protection layer HTc layer Inter-mediate layer metal layer Stab. layerMetal layer thickness Width Type Critical current

HTS production technology (2) HTS production technology (1) Ion Beam Assisted Deposition for intermediate layer between metal substrate and HTS. Pulsed Laser Deposition for HTS layer.

HTS cable element develop. history in Fujikura World-top-class 5T HTS magnet

High-Tc power cable AC power loss Fujikura succeeded to develop 5kA HTS power cable in 2013 with 1.37W/m AC loss. Fujikura proposed to use 5kA HTS power cable in ILC AC-HV power line. Power cable using 500A HTS cable element

(3) High efficiency cryogenics for HTS cable (Maekawa Co.)

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