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HE-LHC & VHE-LHC accelerator overview, injector chain,
and main parameter choices Frank Zimmermann
Joint Snowmass-EuCARD/AccNet-HiLumi LHC meeting 'Frontier Capabilities for Hadron Colliders 2013‘
21 February 2013work supported by the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no. 227579
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PSB PS (0.6 km)SPS (6.9 km) LHC (26.7 km)
TLEP (80 km, e+e-, up to ~350 GeV c.m.)
VHE-LHC (pp, up to 100 TeV c.m.)same detectors!
also: e± (120 GeV) – p (7 & 50 TeV) collisions
possible long-term strategy
≥50 years of e+e-, pp, ep/A physics at highest energies
(E. Meschi)
HE-LHC (pp, 33 TeV c.m.)
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E. Todesco, L. Rossi, P.. McIntyre
HE-LHC: in LHC tunnel (2035-)ECoM=33 TeV,x1034cm-2s-1
VHE-LHC: new 80 km tunnelECoM=84-104 TeV,x1034cm-2s-1
J. Osborne, C. Waaijer, S. Myers
LHC & LHC upgradesLHC is the 1st Higgs factory! ECoM=8-14 TeV,1034cm-2s-1
total cross section at 8 TeV: 22 pb1 M Higgs produced so far – more to come15 H bosons / min – and more to come
20-T dipole magnet
80 km tunnel
8 14 TeV: ggH x1.5
14 33 TeV: HH x6
HL-LHC (~2022-2030) will deliver ~9x more H bosons! ECoM=14 TeV,5x1034cm-2s-1
with luminosity levelingF. Cerutti, P. Janot
16-T or 20-T magnets
HH x42
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Circular & Linear HF:peak luminosity vs energy
K. Yokoya, KEK
LEP3/TLEP would be THE choice for e+e- collision energies up to ~370 GeV
LEP3 , TLEP
x 4 IPs
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Report of the ICFA Beam Dynamics Workshop “Accelerators for a Higgs Factory: Linear vs. Circular” (HF2012) by Alain Blondel, Alex Chao, Weiren Chou, Jie Gao, Daniel Schulte and Kaoru Yokoya, FERMILAB-CONF-13-037-APC, IHEP-AC-2013-1, SLAC-PUB-15370, CERN-ATS-2013-032, arXiv:1302.3318 [physics.acc-ph]
comparing expected performance on Higgs coupling
TLEP has the best
capabilities
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HE-LHC - studiesCERN working group in 2010
published report R. Assmann et al,“First Thoughts on a Higher-Energy LHC” CERN-ATS-2010-177
EuCARD-AccNet workshop HE-LHC’10 Proceedings (ed. E. Todesco, F. Zimmermann)“EuCARD-AccNet-EuroLumi Workshop: The High-Energy Large Hadron Collider”arXiv:1111.7188 ; CERN-2011-003
HiLumi LHC WP16
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HE-LHC – LHC modifications
Linac4
SPS+,1.3 TeV,
HE-LHC
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VHE-LHC - studies80-km tunnel study
John Osborne, C. Waaijer,“Pre-Feasability Assessment for an 80 km Tunnel
Project at CERN” Open Symposium - European StrategyPreparatory GroupContribution ID : 165
European Strategy briefing bookletsection in accelerator chapterR. Aleksan, C. Biscari, M. Lindroos, L. Rivkin, F. Zimmermann
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VHE-LHC
VHE-LHC
VHE-LHC-LER =TLEP!
(Lucio Rossi)
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parameters – 1
?>3.0
available now at LHC!O. Dominguez, L. Rossi, F.Z.
smaller?! (x1/4?)
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parameters – 2
*100?
O. Dominguez, L. Rossi, F.Z.
33?
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radiation damping
use controlled blow up by noise injection:
• longitudinal plane (constant bunch length, Landau damping)
• transverse planes(constant beam-beam tune shift)
choose round (ex=ey) or flat beams (ex>>ey)
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peak luminosity, pile up, radiation
are 5x1034 cm-2s-1 and pile up of 190 good targets for HE-LHC and VHE-LHC?
it would be easy to get more luminosity
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SR heat load
HE-LHC: 3.5 W/mbeam screen at 40-60 K (instead of 4.6-20 K)+ warm photon absorbers for vacuum?
VHE-LHC: 33 W/mdedicated photon stopsas developed by FNAL for VLHC by P. Bauer et al. (2001-2003)
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collimation challenges
• higher energy density → need for more robust materials
• cross section for single diffractive scatteringincreases with energy → degraded
cleaning efficiency• smaller beam sizes & smaller gaps →
higher precision in collimator control• (warm? or shielded SC) magnets in the
collimator insertions
VHE-LHC: 99 W/mdedicated photon stops
R. Assmann, HE-LHC’10
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IR quadrupoleshow do IR magnets scale with energy and beta*?
7 TeV
16.5 TeV field: x (16.5/7)1/2
16.5 TeV
R. De Maria
5 9 14 17 23
16.5 TeV gradient: x (16.5/7)
236 470
e.g.: b*=0.3 m, 400 T/m, bpeak~8 km, ge=2.10 mm, full ap. (33 s) ~32 mm (16.5 TeV) b*=0.9 m, 700 T/m, bpeak~1 km, ge=3.37 mm, full ap. (33 s) ~8 mm (50 TeV)
peak beta function as a function of quadrupole gradient (horizontal axis), b* (red curves) and magnetic field at 16.5s+11 mm (black curves) for 7 & 16.5 TeV
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arc quadrupoles
40 mm coil aperture as the dipoles
223 T/m x (16.5/7) = 526 T/m at 16.5 TeV223 T/m x (50/7) = 1593 T/m at 50 TeV
(if we assume same length as now)
more demanding than IR quads?!
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quads in parameter plane
E. Todesco
Operational gradient as a function of coil aperture for LHC and US-LARP quadrupoles (markers), scaling laws for limits in Nb.Ti and Nb3Sn (solid curves) [7], and expected values for HE LHC arc and IR (stars).
HE-LHC
VHE-LHC arc
IR
?
?
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«plan for all»
according to physics needs, the 80 km tunnel can:– be alternative to HE-LHC– or be complementary to HE-LHC – accommodate at negligible extra cost TLEP and VLHeC– modular detector design allows evolution from
TLEP-H/TLHeC to VHE-LHC
1995 2000 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050 2055
Proto & Industr.
Physics LHCStuty-R&D
Proto & Industr.
Proto & Industr.
Physics
Install LER
Physics TLEP LHeC
Physics VHE
Study. R&D
VHE- LHC + leptons
HL- LHC
HE- LHC
Constr. VHE
Constr & Install.
Constr. LER
Tunnel construction
Constr. and Install. VHE
Study - R&D
Constr. & Install.
Constructions and Installation
Physics
reuse HE-LHCmagnets?
Lucio RossiCLIC workshop 28 Jan. 2013
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“We don’t get a chance to do that many things and every one should
be really excellent.”
Steve Jobs