2. 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.

3. 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)

4. 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

5. 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

6. Draft RF powering cost estimate
1300 Modulators + 24 centralised AC/DC converters : 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

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

8. 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
kV kV I
III II
* the French power transmission system operator

9. 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

10. 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