CLIC Civil Engineering & Infrastructure Working Group Meeting CLIC powering Davide Aguglia, TE/EPC & Davide Bozzini, EN/EL CLIC Civil Engineering & Infrastructure Working Group Meeting 16th of June 2017 EDMS no.

Powering studies history 2012 CDR TE/EPC delivered full study on the magnet powering. RF powering solution was preliminary EN/EL delivered a preliminary study on the power distribution Since 2012 TE/EPC efforts focussed on RF powering TE/EPC made a step toward the powering grid design with objective to define modulators specs (EN/EL contacted for advices)

The design global approach Best grid layout via optimisation considering: Technical feasibility – power fluctuations Accelerator availability (reliability and modularity) Ability to handle short-circuits in the network with standard grid components (switchgears mainly) Cost: only for optimisation tendency purposes – no absolute cost accuracy! Evaluation DC voltage level of the modulator via optimisation Best solution 20kV DC distribution Main conclusions: Medium voltage configuration efficient estimation: 97.5%; Low voltage configuration: efficiency estimation <96%, more current, more copper, more expensive; Accelerator does not need to be synchronised with utility grid frequency; Modulator best primary DC voltage is 10kV; Low voltage configuration Medium voltage configuration 1300 klystron modulators 2 Km in length

Grid design solution (TE/EPC) 6 sectors for RF power distribution (3 TeV) Medium AC voltage input (~10kV AC) 20kV DC voltage output Each sector feeds ~220 modulators (1 mod. per klystron) Each sector needs a substation/location for: AC transformers, bus bars and grid switchgear at medium voltage 4 x Modular Multilevel AC/DC converter rated at 16 MW each (n+1 redundancy) One substation needs an indoor space of (very roughly): ~ 1500 m2 x 10m height Drive beam injector Main beam injector Experimental buildings 2140m

Draft RF powering cost estimate 1300 Modulators + 24 centralised AC/DC converters : 0.5 - 1 Billion CHF range Not included in this estimate: Civil engineering Cooling and ventilation Grid distribution (transformers – bus bars - Cabling - switch gears) – for substations and central distribution at 400 kV voltage level

CLIC power requirements As specified in CDR Aguglia’s Slides Source:B. Jeanneret, CLIC Project meeting, Oct 2011

Availability of power I  II III At European Grid level Based on mid long term plan of RTE* (towards 2030) considering power requirements for FCC 200 MW (i.e 222 MVA) available at each 400 kV sources I,II, III Power availability at lower voltages are included in the same budget I  III II ---- 400 kV ---- 230 kV I III II * the French power transmission system operator

Typical layout for 400 kV supply From existing 400 kV RTE substation 3 TeV example covering RF loads and IP loads of other users Optimized network operability and availability Existing European grid node I

Conclusion TE/EPC has a conceptual design for the RF powering The availability of the electrical power from the European grid for all CLIC configurations remains to be confirmed Feasibility shall be discussed with French power transmission system operator A rough 10’000 m2 building surface should be allocated to the sectorized power distribution and AC/DC conversion A rough 70’000 m2 outdoor surface shall be allocated for the connection to the 400 kV European grid TE/EPC and EN/EL are now working together to validate / tune the proposed powering solution Guidelines are required on how to update the CDR Optimized design for each energy level Expandable design adapted to lower to higher energy level