An Introduction to the LHeC Large Hadron Electron Collider M.Klein - BINP - 9/06/9 1 1. ep as a complement to pp and ee 2. A summary of the project 3. Remarks on the accelerator design studies isit of Karl Hubert Mess (CERN), Davide Tommassini (CERN) and Max Klein (U.Liverpool) he Budker Institute of Nuclear Physics of the Siberian Academy of Sciences (Novosibirs Max Klein Novosibirsk 9/06/9 [email protected]
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An Introduction to the LHeC Large Hadron Electron Collider
An Introduction to the LHeC Large Hadron Electron Collider. Max Klein Novosibirsk 9/06/9. ep as a complement to pp and ee A summary of the project Remarks on the accelerator design studies. Visit of Karl Hubert Mess (CERN), Davide Tommassini (CERN) and Max Klein (U.Liverpool) to - PowerPoint PPT Presentation
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An Introduction to the LHeC
Large Hadron Electron Collider
M.Klein - BINP - 9/06/9 1
1. ep as a complement to pp and ee2. A summary of the project3. Remarks on the accelerator design studies
Visit of Karl Hubert Mess (CERN), Davide Tommassini (CERN) and Max Klein (U.Liverpool) toThe Budker Institute of Nuclear Physics of the Siberian Academy of Sciences (Novosibirsk)
quark+gluon densities in the protonphoton-quark/gluon physicsparton amplitudesmultijets, …
e and p fixed target experiments
No neutron structure exploredNo nuclear structure explored
In the accessed energy range:No SUSY No leptoquarksNo extra dimensions
1000 physicists for 25 yearsdeveloped the techniques of ep scattering at high energies, the accelerator, the collider experiments, the theory and analysis techniques. 800 PhD’s, 350 publications
Tentative design: full coverage, high precision, no material…- modular for installation (CMS), dimensions determined by beam pipe-IR-synchr. rad. : to be simulated - focusing magnets nearer to IR for high Q2, high luminosity (instrumented?) - variation of beam energies to access low Q2 and large x at “medium” Q2 ~ 20000 GeV2
- contacts to ILC (4th concept: coil? ALIROOT) and ATLAS/CMS detector developments
P.Kostka, A.Polini, R.Wallny
Deep Inelastic Scattering
SLAC 69: 2m LINAC: a “bold extrapolationof existing technology” to “collectdata which may be of future use…”
50 000 times Q2 possibly with5 times the accelerator length..
In one year we hope to know how to build the ep/eA collider complement of the LHC, and we will start to lookinto the TeV scale physics with pp.The CDR should help shaping our future.
www.lhec.org.uk, EPAC08, .. also forproper referencing of work presented above.
Involves manygifted and enthusiasticcolleagues in thy, exp and acc,Supported by ECFA, CERN, NuPECC.
-New physics expected at (multi??) TeV scale. Low x=Q2 /sx, s=4EeEp
highest possible Ee and Ep 1 TeV with 50GeV on 5000 GeV
-New physics is rare [ep (Higgs) = O(100)fb] , rate at high Q2 , large x
L has to exceed 1032 and preferentially reaches 1033 and beyond
-New states, DVCS, electroweak physics
Need electrons and positrons and high lepton beam polarisation
-Neutron structure terra incognita
Deuterons
-Partonic Structure of Nuclei
a series of nuclei, Ca, Pb
Max Klein LHeC 2/09
Machine Considerations and Studieshigh Ee,p,A, e polarised, high Luminosity
generalities
simultaneous ep and pp
power limit set to 100MW
IR at 2 or 8
p/A:
SLHC - high intensity p(LPA/50ns or ESP/25ns)
Ions: via PS2new source for deuterons
e Ring:
bypasses: 1 and 5[use also for rf]
injector: SPL, or dedicated
e LINAC:
limited to ~6km (Rhone)for IP2, longer for IP8CLIC/ILC tunnel.?
RR
LR
CERN power consumption
M.Klein - BINP - 9/06/9 25
Myers limit of 100 MW *2000 h/a 200 GWh, less P is desirable
A lattice
M.Klein - BINP - 9/06/9 26
F.Willeke, CERN Seminar, June 14th, 2006
A lattice
M.Klein - BINP - 9/06/9 27
F.Willeke, CERN Seminar, June 14th, 2006
A lattice
M.Klein - BINP - 9/06/9 28
F.Willeke, CERN Seminar, June 14th, 2006 -- cf also J.Jowett and B.Holzer/A.Kling Divonne 9/2008
Max Klein LHeC 2/09
e Ring Further Considerations
Mount e on top of p - feasible at first sight needs further, detailed study of pathway
Installation: 1-2 years during LHC shutdowns. LEP installation was ~1 year into empty tunnel. Radiation load of LHC pp will be studied.
Injection: LEP2 was 4 1011 e in 4 bunches LHeC is 1.4 1010 in 2800 bunches may inject at less than 20 GeV.
Power for 70 (50) GeV Ee fits into bypasses:
SC system at 1.9o K (1 GHz) r.f. coupler to cavity: 500 kW CW - R+D 9 MV/cavity. 100(28) cavities for 900(250)MV cavity: beam line of 150 (42) m klystrons 100 (28) at 500kW plus 90 m racks .. gallery of 540 (150) m length required.
T.Linnecar
Bypasspoint 5
2 tunnels for ring and shielded rf
Bypass through survey gallery13m distance, 2 shafts
Bypass independent of IR~30m distance, 1 shaft
Tunnel connection (CNGS, DESY)
Lattice studyH.Burkhardt
S.Myers, J.Osborne
Max Klein LHeC 2/09
Interaction Region Design
builds on F.Willeke et al, 2006 JINST 1 P10001 design for 70 GeV on 7000 GeV, 1033
and simultaneous ep and pp operation
B.Holzer, A.Kling, et al Divonne 08
Luminosity: Ring-Ring
€
L =N pγ
4πeε pn⋅
Ieβ pxβ py
= 8.31032 ⋅Ie
50mA
m
β pxβ pncm−2s−1
€
εpn = 3.8μm
N p =1.7 ⋅1011
σ p(x,y ) =σ e(x,y )
β px =1.8m
β py = 0.5m
€
Ie = 0.35mA ⋅P
MW⋅
100GeV
Ee
⎛
⎝ ⎜
⎞
⎠ ⎟
4
1033 can be reached in RREe = 40-80 GeV & P = 5-60 MW.
Table values are for 14MW synradloss (beam power) and 50 GeVon 7000 GeV. May have 50 MWand energies up to about 70 GeV.
LHC upgrade: Np increased.Need to keep e tune shift low:by increasing p, decreasing e but enlarging e emittance,to keep e and p matched.
LHeC profits from LHC upgradebut not proportional to Np
B.Holzer
e injector from SPL to Point 2 via TI2 Alternative injectors considered too (cf H. Burkhard, DIS08, Proceedings)
SPL
PS2
LINAC4
Max Klein LHeC SAC-CI 11/08
SPL as e injector/linac to Point 2 via TI2 tunnel here with new re-circulating loop (r ~20m, l~ 400 m), use of service tunnel or dogbone to be studied … 20 GeV
Drawing by TS CERN
for SPL see CERN-AB-2008-061 PAF. R.Garoby et al.
proton parameters: LPA upgrade sLHC: Nb=5x1011, 50 ns spacing, ε=3.75 m, *=0.1 m, z=11.8 cm
LHeC Conceptual Design being prepared as CERN-ECFA-NuPECC Activity [2007-10] CDR to include: Acc, IR, Infrastructure, Detector, Physics Programme
Aim: TeV cms energy eq collider design with maximum luminosity as an upgrade to the LHC and a complement to pp and ee (or μμ?) TeV scale colliders, with a built in eA phase and the aim to simultaneously run pp and ep by 2020+
Two options for CDR: RING-RING: 50-80 GeV, 1033, ring to be installed on top of LHC, bypasses
LINAC-RING: 50-150 GeV, 1032 (w/o energy recovery), a new design, ILC cavities
Time schedule: CDR: Divonne 1-3.9.2009, ECFA November 2009, DIS 4/2010 Florence CDR in 2010
Cпacибо
References for Ring Design
M.Klein - BINP - 9/06/9 45
LEP
J. Dainton et al (F.Willeke) 2006 JINST 1 10001F. Willeke, Accelerator Seminar at CERN, 14/06/2006 H.Burkhardt, Talk and Proceedings at DIS08, London, April 2008 [injector, bypass] Talks at Divonne 9/2008 (T.Linnecar rf, B.Holzer/A.Kling e optics, J.Jowett lattice, ..)EPAC08 J.Dainton, H.Burkhardt, F.Zimmermann, 3 papers submitted, Genua, May 2008PAC09 F.Zimmermann et al., Talk and Paper submitted, Vancouver, May 2009
Mostly availabe on the LHeC websitehttp://www.lhec.org.uk