1. CERN-INFN, 23 Febbraio 2017
Stato del programma 16 T
Davide Tommasini

2. Questions addressed by the program
Are 16T accelerator magnets feasible?
can we achieve the field with “sufficient” margin?
can we protect the magnet, once in the whole circuit?
can we meet the field quality requirements?
If yes, at which cost?
cost of conductor
cost of construction

3. Masterplan 2017-2023 Conductor
Procurement of ~ 1 t of conductor/year to feed models and demonstrators
Increase of Jc up to FCC target ( K, 16 T)
Vigurous conductor R&D, the FCC program is co-funding a 2nd line at Bruker-EAS
Initiatives in Russia (Bochvar/TVEL), Korea (KISWire/KAIST), Japan (KEK/Jastec/Furukawa) for conductor development towards target Jc
Comprehensive electro-mechanical characterization
Feed the FCC Conceptual Design Report (end 2018)
One reference option, including cost, plus a description of the alternative options.
Models ( )
Design, Manufacture & Test of ERMC and RMM Models.
Demonstrators ( )
Design, Manufacture & Test of Demonstrator Magnets (< 2m long).
Longer magnets (2023-)

4. Base (interna, confidenziale) per ordini conduttori
Table I : number of coils to manufacture as a function of coil type and time
Description
Mass [kg]
Site
2017
2018
2019
2020
2021
2022
2023
ERMC non-graded 70
CERN 3
CEA
CIEMAT 1 2
RMM non-graded
ERMC graded-HF 15 5
ERMC graded-LF 27
RMM graded-HF 10
RMM graded-LF
DemCea - HF 30
DemCea - LF 42
DemCiemat - HF
DemCiemat - LF
DemInfn - HF
INFN
DemInfn - LF
DemCern - HF 7
DemCern - LF
ProtCern – HF (6m)
120
ProtCern – LF (6m)
170

5. Present programs FCC 16 T Magnets Technologies EuroCirCol WP5
US Magnet Development Program

6. Recent initiatives CEA (being finalized)
Development and manufacture of a demonstrator model.
CERN will provide the conductor, the main components and a monetary contribution.
CIEMAT (looking for funding the laboratory infrastructure)
Participation to the manufacture of ERMC/RMM model coils and possibly to the development and manufacture of a 16 T demonstrator (probably common coil).
INFN (under discussion)
Development and manufacture of a demonstrator model.
CERN will provide the conductor, the main components and a monetary contribution.
Swiss contribution & PSI (signed)
Exploration of a canted cosine-theta options (whole magnet or instert)
Development of reaction resistant Nb3Sn splices

7. Models: 16 T Magnets Technology Program
Two model types: ERMC and RMM, non-graded and graded versions
530
800
a real straight section
a structure for fields up to T, key & bladders for ease of multiple assembly
ERMC coils compatible with use in the RMM
RMM equipped with harmonic field probes
RMC
ERMC/RMM
demonstrate that the field level can be achieved with margin and limited/no training
measure and characterize field quality static and dynamic with different conductors
management of transitions (layer jump, ends …)
study/optimize coil manufacture (including interface conditions coil/pole, coil-coil …)
explore different loading configurations/strategies (transversal & longitudinal)
splice studies in real magnet configuration

8. *H2020-INFRADEV-1-2014-1 EuroCirCol WP5*
Explore design options for a 16 T accelerator dipole magnet
Feed the FCC-CDR with a baseline magnet, including cost
Japan
KEK
Finland
TUT
France
CEA
Italy
INFN
Netherlands UT
Spain
CIEMAT
CERN&UNIGE
WP 5
TASKS of WP5
5.1: Work Package Coordination 
5.2: Study magnet design options 
5.3: Develop dipole magnet cost model 
5.4: Develop Magnet Conceptual Design 
5.5: Conductor studies 
5.6: Devise quench protection concept 
5.7: Produce Magnet Engineering Design  
Three options are being considered:
Block coils (CEA)
Common coils (CIEMAT)
Cosinetheta (INFN)
*H2020-INFRADEV

9. US MDP
Priority is to demonstrate 14 T in a cosinetheta configuration using part of the tooling of the 11 T. Tests planned in 2018.

10. Salient common assumptions
Magnet length m
Free physical aperture mm
Field amplitude T
Margin on the 1.9K 14 %
Total time delay ms
Critical current 1.9 K, 16T (total) 2300 A/mm2
Conductor fit (Jc/B) Bernardo’s fit
Degradation due to cabling 3%
Minimum Cu/nonCu also check
Maximum strand diameter mm also check 1.1 mm
Maximum (any) stress on conductor 200 MPa
Maximum hot spot temperature 105% Inom) 350 K
Maximum number of strands in a cable 40 check up to 60
Maximum voltage to ground (magnet contribution) 1.2 kV set as tentative value
Maximum TOTAL voltage to ground 2.5 kV
Conductor cost (performance based) 5 Euro/kAm

11. Summary of present status and next steps
Conductor:
about 50 km RRP from OST in house
agreements with Russia, Korea, Japan for conductor development towards target Jc
ERMC/RMM:
design completed
start winding in April 2017
EuroCirCol:
three design options available in 2D (electromagnetic and mechanical)
further work and initial 3D until FCC week in Berlin (May 2017)
quench studies well advanced, a common tool for all teams
cost model: well advanced, still major uncertainty on conductor cost
selection of one baseline design for the FCC CDR, description of the alternative options
Demonstrators:
ideally constructional design of all design options as basis for demonstrators
start winding in 2019
ideally one demonstrator per each of the EuroCirCol design options, possibly one more (canted type) depending on advancement of work at PSI and US MDP
one 14 T demonstrator being developed with the US MDP

12. Grazie