3 CERN SRF Workshop 31 May 1 June18 CERN On behalf of the FCC SRF WP Collaboration O Brunner International FCC collaboration CERN as host lab to study ppcollider FCC ID: 792734
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Slide1
SRF R&D program for the Future Circular Collider
#3 CERN SRF Workshop, 31 May – 1 June‘18, CERN
On behalf of the FCC SRF WP CollaborationO Brunner
Slide2International FCC collaboration (CERN as host lab) to study:pp-collider (FCC-hh
)e+e- collider (FCC-ee) -> as potential first stepHE-LHC with FCC-hh technology
p-e (FCC-he) option, IP integration, e- from ERLFCC study
Numbers and challenges are BIG!:
FCC-
hh
:
-> 16 (20) T magnets
->
Stored beam energy
8.4
[
GJ
]
(~ 21 x LHC! enough to melt > 10 tons of copper)
-> SR emitted
by the beams ~
100
to 1,000 times
LHC
FCC-
ee
:
-> SR 50 MW per beam ->RF power to the beam
->
~ 150 – 170 MW of electrical power
-> up to ~ 11 GV of RF voltage
Slide3RF
L
B
H
F
J
D
RF
FCC-
ee
F. Valchkova-Georgieva et al.
1 tunnel, 2 different arrangements
FCC-
ee
: machine + booster
FCC-
hh
:
machine +
injector chain
FCC-
hh
Slide4FCC-ee
parameters
4 energy setups in 2 categories: High current: -> low voltage and high current, i.e. Z and W (FCC-hh
) High energy: -> low beam current and high accelerating voltage, i.e. H and tt.
Selection of 3 cavity sets to cover all options (machine & booster):
h
igh
intensity (Z, FCC-
hh
) -> 400 MHz
single-cell cavities, ~1 MW
source
the cavity
design
must be carefully optimized with regard to higher order modes (HOM)
higher
energy (W, H): 400 MHz 4-cell Nb/Cu
cavities
HOMs are still a challenge! BUT good acceleration efficiency required
tt
machine complement: 800 MHz 5-cell cavities based on bulk Nb
high acceleration efficiency, shorter footprint, smaller waveguide (radiation protection)
Slide5FCC-
ee
staging scenario
Construction in 5 steps:
sequential 8 months of operation /4 months winter shutdown (hardware upgrades)
interesting
physics at each energy steps with required luminosity
1 year-long shutdown
to allow for ttbar upgrade
installation sequence comparable to LEP ( ≈ 30 CM/shutdown
)
Z machine hardware can be re-used for FCC-
hh
Slide6Cavity and HOM coupler designs
A.
Grudiev et al.
Innovative crab cavity design (WOW cavity)open waveguide:
excellent HOM
damping, low Z
w
ell suited for Nb/Cu technology
-> coating feasibility under study (TE/VSC)
optimization
of accelerating
cavities & HOM couplers
S.
Gorgi
Zadeh
et
al.
c
avity design
beam – cavity interactionI. Karpov et al.
RF quadrupole resonator for Landau damping A. Grudiev
et al.Performing design compared to double-QWR and RF dipole cavity
Slide7High efficiency klystron
Increasing energy efficiency & reducing energy demand critical for future accelerators (FCC, ILC, CLIC,..)High Efficiency International Klystron Activity led by CERN since 2013 (HEIKA)
new code “KlyC-2D”, cross-checked with other platforms -> very fast, reliable and free!
development of new klystron bunching technologies with increased efficiencyprototype for high efficiency CSM tube
I. Syratchev, J.
Cai
Slide8Cavity material & performance
Advances with Nb3Sn
Nb3Sn/Nb by Sn diffusion (Cornel, Fermilab)
-> good result at 1.3 GHz, ready to go at 800 MHzmagnetron sputtering of Nb3Sn thin films on copper (TE/VSC) -> high quality films
produced
K. Ilyina-Brunner
, 16:15 - 16:30 today
A15 coatings
Nb/Cu -
breakthrough
performance
G. Rosaz
et
al.
G. Rosaz
, 16:00 - 16:15 today
HiPIMS
A. Sublet, 14:40 – 15:00 today
Thin
Film deposition techniques for SRF
A.
Miyazaki, 11:15 - 11:30 tomorrow Review of LHC cavity cold tests
M. Martinello et al.
Total cryogenic power in MW for FCC-ee ttbar
S. Aull et al. (2016)
Slide9Innovative cavity fabrication
techniques
C. Pira et al.new methods for cavity fabrication
seamless 400 MHz aluminium prototype (INFN-LNL)
additive
manufacturing with Nb
complex
shapes with cooling channels
excellent density (powder choice is crucial)
superconductivity confirmed
post-processing
of parts
significantly improves:
p
urity
s
urface roughness
C. Abajo
et al.
electro
Hydro-Forming (Bmax / EN/MME)
802 MHz bulk Nb cavity (Jlab)
F.
Marhauser et al
Field-emission on-set from ~20 MV/mMultipactor free
R. Gerard, 09:45 - 10:00 tomorrow
Developments for SRF equipment with additive manufacturingF. Gerigk
15:00 – 15:20 today High gradient program
Slide10Characterization of
Nb superconducting films on copper
quadrupole resonator (BE-RF)Measurement of , penetration depth, quench field (high T), thermal conductivity, RRR
M. Arzeo et al.
FIB microscopy (focused ion beam
) (EN-MME)
Microstructural
characterisation of SRF cavity coatings
A. Lunt
et
al.
V.
Del Pozo Romano
, 17:00 – 17:15 today
QPR II
Slide11Copper electro-polishing studies
Substrate IS CRITICAL!
Past experience proves that copper electro-polishing provides superior accelerating performances if compared with copper chemical polishing -> copper electro-polishing facility soon available at CERN (TE/ VSC)
L. Marques
Antunes
Ferreira
, 16:30 – 16:45 today
Surface Chemistry
Slide12AM Valente Feliciano, FCC week 2018