EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
LHeC Status
THE COCKCROFT INSTITUTE
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John Dainton
Cockcroft Institute and Univ Liverpool,
Daresbury Science and Innovation Campus, GB
1.
2.
3.
4.
5.
Why?
with
and for
the snapshots
LHeC
Physics
– some
LHeC steering group
Machine
Experiment
When: Towards a CDR
http://www.lhec.org.uk
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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1.Why?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why? The Energy Frontier
 1968-1986
THE COCKCROFT INSTITUTE
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pp
Drell Yan
charm
W,Z
jets
lh
quarks
neutral currents
singlet eR
asymptotic
freedom
SU(2)L x U(1)
QCD
e+echarm
3 colours
gluon
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why? The Energy Frontier
 1986-2010
Fermi scale
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pp
b quark
t quark
MW
(TeVatron)
lh
spacelike EW
strong interaction
high density QCD
c,b in hadrons
(HERA)
νmass
Standard
Model
e+eMZ , sin2θ, 3 ν
h.o. EW (t,H ?)
(LEP/SLC)
CKM
(B-factory)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why? The Energy Frontier
 2008-2033?
Terascale
lh
TeVdiscovery
& precision ?
particles ?
symmetries ?
dense QCD
(LHeC)
pp
TeV discovery ?
Higgs?
new particles?
new symmetries?
(LHC)
Beyond
Standard
Model
new physics
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e +e ttdiscovery &
precision ?
spectroscopy
Higgs ?
(ILC/CLIC)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why? The Matter Frontier
 2008-2033?
chromodynamic
creation ?
lA
QCD dof @
extremes
strong QCD  1C
(LHeC)
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AA
QGP ?
QCD phase
equilibria?
nuclear dynamics?
nuclear formation
(LHC)
matter creation
new physics
e +e pQCD
(ILC/CLIC)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why:
Leptons  Quarks ?
THE COCKCROFT INSTITUTE
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•how are leptons and quarks related ?
ICHEP86 Berkeley
•put them together at the highest energy
in the finest detail
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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Lepton+quark @ TeV
●unique chiral probe @ 0.0001 fm ?
●70 e±  p 7000 GeV
●Cambridge
SM + new Lq physics
@ ~ 0.0001 fm ?
g+EW
am?
seq
Q2
NC+CC+gluon
e± RL
quark
?
SLAC
nucleon
Z W
Chadwick
protons+neutrons
RL
Manchester
nucleus
e
cm energy 1400 GeV
●
LHeC
?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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Why: Structure @TeV
●unique chiral probe @ 0.0001 fm ?
e
e
Manchester
g+EW
SM + q structure
@ ~ 0.0001 fm ?
NC+CC+gluon
QCD
quark
x
SLAC
nucleon
y
Chadwick
protons+neutrons
Q2
nucleus
●Cambridge
●
LHeC
?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why? The Scope
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
discovery + precision
@ Terascale
precision structure
and dynamics
@ LHC TeV scale
very
dense
matter
nuclear
structure
& dynamics
@ 100s GeV
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
TeV eq Kinematic Reach
e± RL
am?
seq
Q2
space-like >TeV
●2007: HERA
-Q2 ≤ 30,000 GeV2
-seq ~ (300 GeV)2
in ~ 0.7 am
●≥20..?: LHeC
-Q2 ≤ 4×106 GeV2
-seq ≤ (4000 GeV)2
in ~ 0.1 am !
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LHeC
seq
3×10-7
>TeV
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Why: Dense Colour ?
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Most of the mass of ordinary matter is concentrated in protons and
neutrons. It arises from …[a]… profound, and beautiful, source.
Numerical simulation of QCD shows that if we built protons and neutrons in
an imaginary world with no Higgs mechanism - purely out of quarks and
gluons with zero mass - their masses would not be very different from what
they actually are. Their mass arises from pure energy, associated with the
dynamics of confinement in QCD, according to the relation m = E/c2. This profound
account of the origin of mass is a crown jewel in our Theory of Matter.
Frank Wilcek CERN October 11, 2000
•probe hadronic matter at highest parton density
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
QCD is headline stuff !
●found on a Guardian newsaper
web page
●found on
Frank Wilcek’s
blackboard
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
TeV
QCDep
Field
Kinematic
Energy Reach
Density
2007: HERA
●≥2016?:
LHeC
-Q2 ≥ 1 GeV
GeV22
-7
--xxBj ≥ 5×10-5
e±
THE COCKCROFT INSTITUTE
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space-like >TeV
e±
Q2 y
x
3×10-7
seqLHeC >TeV
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Gluon recombination
●≥20..?: LHeC
-Q2 ≥ 1 GeV2
-xBj ≥ 5×10-7
e
THE COCKCROFT INSTITUTE
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•Q2  size of gluons
•xBj  phase space for gluons
p and A
e
Q2 y
x
low x large nuclei
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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2.LHeC physics
- some snapshots
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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Lepton+quark @ TeV
●leptoquark systems – new physics + SM
LHC
LHeC
Re
+ resonance
SM (hadronic) + signal
SM (electroweak) + signal
Lq & LqLq production
Lq formation
σ ~ few × 0.1 fb (Λ=0.1)
σ ~ 100 fb (Λ=0.1)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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Lepton+quark @ TeV
●leptoquark systems – new physics +SM
LHeC
×10-3
↓
LHC
LHeC
1 TeV
LHC
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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Lepton+quark @ TeV
LHC Lq pairs+decay LHeC Lq formation+decay
e+
e,
e-
q
_
q or q ?
fermion
number
_
_
q or q ?
_
qq  g  Lq Lq
spin
parity production
mechanism ?
and
chirality disentangle mass
spectrum ?
experiml
jets + leptons
signature
e+ F=0
e- F=2
defined formation (eLR)
 precision BRs (NC CC)
e
inclusive coherence
e
unique PWA
*
q
SM + signal + interference
jet+lepton+pT balance
jet
+pT imbalance
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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Lepton+quark @ TeV
LHC Lq +decay
LHeC Lq formation+decay
e,
fermion
number
q
_
gq  Lq l
spin
parity production
mechanism ?
and
chirality disentangle mass
spectrum ?
experiml
jet + leptons
signature
e+ F=0
e- F=2
defined formation (eLR)
 precision BRs (NC CC)
e
inclusive coherence
e
unique PWA
*
q
SM + signal + interference
jet+lepton+pT balance
jet
+pT imbalance
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Unification ?
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•precision  QCD at highest energy
●short distance
structure of SM+
- 2007  @ 10-3 ppm
- 2007 GF @ 10 ppm
- 2007 G @ 0.1%
- 2007 αS @ 1-2%
- LHeC + detector
 αS @ few ‰
●
precision  extrapolation  discovery
probe new chromodynamic physics – beyond SM ?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Lepton-Parton and
Parton-Parton ?
•ep  eX
e
RL
THE COCKCROFT INSTITUTE
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•pp  (jet+jet)X
probe-parton
jet
?
?
Z W
g q
?
?
•LHeC energy scale:
707000 GeV
•pp energy scale:
jet
70007000 GeV
probe+p at LHeC scale
probe = e 
xprobe/p = 0.01
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
LHC probe parton
●probe-parton @ x  0.01
- - xq = xU +xD +xU +xD
g :q ~ 2:1 mixed
●probe-parton @ x » 0.01
g :q  0 all quark
“mixed” LHC probe
@ LHeC energy
q LHC probe
@ LHC top energy
THE COCKCROFT INSTITUTE
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Gluon recombination
@ HERA
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●low-x rise of F2
- HERA: precision @ x > 10-4 @ Q2=10 GeV2
●relentless rise of
quark (F2)
and
gluon
∂F2/
∂lnQ2
Gluon recombination @ LHeC
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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●low-x rise of F2
- LHeC: precision @ x > 10-4 @ Q2=250 GeV2
stat 0.1%
sys 2-3%
HERA
(10 fb-1)
(Jeff Forshaw)
●LHeC
“nails”
saturation
Gluon recombination @ LHeC
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
●ep saturation Q2 ≤ 5 GeV2
eA saturation Q2 ≤ 20 GeV2
●LHeC “nails” saturation
THE COCKCROFT INSTITUTE
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Partons in Nuclear Matter
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
●fundamental to origin of mass in Universe (Wilczek)
- from nucleon valence to QCD-field dominated (x )
- increasing number of valence partons (A )
●very limited, but tantalising, old data
- Q2 < 1 GeV2 x > 0.01
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
1C dynamics in p and A
THE COCKCROFT INSTITUTE
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●low-x reach at LHeC
precision @ x > 10-4
@ Q2=250 GeV2 (x =βxIP)
HERA
?
LHeC
DGLAP
●low x physics of IP
IP in IP: triple IR
QCD  reggeon calculus ?
IP @ low-β
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
1C dynamics in p and A
●low-x IP physics at LHeC
●LHeC diffraction “nails” saturation
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
1C dynamics in p and A
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
●IP physics at LHeC
0+ “vacuum” physics
ILC e+e1- “vacuum”
physics
oGeV: leptopomerons ?
●●rapidity
e*IP physics
≤ 5 @θ >100
≤ 100
few
GeV
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
3.Machine
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Proton beam
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●”standard” LHC protons … with electrons?
protons
protons
antiprotons
protons
electrons?
Np
εpN
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
●e-ring
LHC
- bypass experiments and RF ?
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
ep Collisions
THE COCKCROFT INSTITUTE
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●after B physics @ LHC ?
e
p
civil engineering
tunnel >2×250m×2m Ø @IP
ep alongside pp data-taking @ LHC
LHeC
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
L
Luminosity: e-Ring
THE COCKCROFT INSTITUTE
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N p
Ie
I
m

 8.310 32  e
cm2 s1
4e pn  px py
50mA  px pn
P
Ie  0.35mA
MW
 pn  3.8m
N p  1.7 10
11
 p ( x, y )   e( x, y )
100GeV 4
 

 E e 
 px  1.8m
 py  0.5m
●e-ring
- 1033 cm-2s-1
- Ee < 80 GeV
- power P < 60 MW
- ERL  1034cm-2s-1 ?
(eRHIC)
100 mA
klystron
+ SR
1033
cf also A.Verdier 1990, E.Keil 1986
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
e-Ring IR
simultaneous pp (AA) and ep (eA)
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
e-ring
Synchrotron radiation fan
and HERA type absorber
9.1kW
E crit  76keV

100W/mm2
cf also W.Bartel
Aachen 1990
THE COCKCROFT INSTITUTE
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First p beam lens: septum quadrupole.
Cross section and Field calculation
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
e-ring Issues
THE COCKCROFT INSTITUTE
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 power: 25 ns  nx40 MHz RF I < 100 mA
60 klystrons @ 1.3MW, coupler 0.5MW, 66% effy
extra RF in bypasses
 injection: 1.4x1010 e in 2800 bunches (LEP2 4 1011 in 4
energy can be < 20 GeV (ELFE, KEK …)
 SR  LHC magnets: water cooling+Pb
 bypasses: ATLAS CMS + RF
 ~500m from arcs
~ -20cm radius of e-ring
 space: above LHC
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Kicker magnet
installed on beam
dump line above LHC
Equipment above installed LHC beamlines….
THE COCKCROFT INSTITUTE
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Circulating LHC beams
pass in between
support feet
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
e±p Luminosity
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●astounding !
●×102 LNMC μp
@ 0.01 fm
●LeRHIC epolppol eA
@ 0.007 fm
●×102 LHERA epolp
@ 0.001 fm
●LLHeC e±p eA
@ 0.00014 fm
indisputably a next step ?
×10
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
e-linac + LHC
THE COCKCROFT INSTITUTE
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6km
alternative sites
S. Chattopadhyay (Cockcroft), F.Zimmermann (CERN), et al.
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
L
THE COCKCROFT INSTITUTE
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Luminosity: Linac-Ring
P
P / MW
N p
P GeV
32
2 1
I
100mA



110

cm
s
e
*
MW
Ee
4e pn E e
E e /GeV
 pn  3.8m
N p  1.7 1011
 *  0.15m

●e-linac
- 1032 cm-2s-1 ~HERA
- Ee < 140 GeV ($s)
- power P < 60 MW
- 6 km+gaps @23 MV/m
- ERL  ? cm-2s-1
2 linacs
lumi + energy horizon
s = (2 TeV)2
 Ie = 100 mA
High cryo load
to CW cavities
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Linac-Ring & Ring-Ring
L-R
Energy / GeV
40-140 …
Luminosity / 1032 cm-2 s-1
0.5
Mean Luminosity, relative
2
Lepton Polarisation
Tunnel / km
Biggest challenge
Biggest limitation
IR
60-80%
6
CW cavities
luminosity (ERL,CW)
not considered yet
one design? (eRHIC)
THE COCKCROFT INSTITUTE
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R-R
40-80
10
1 [dump at Lpeak /e]
30% [?]
2.5=0.5 * 5 bypasses
Civil Engineering
Ring+Rf installation
maximum energy
allows ep+pp
2 configurations [lox, hiq]
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
Machine
●ring-ring
- stupendous lumi (~ LHC)
- energy horizon ~ 1.2TeV
- civil engineering impact on LHC
- e-polarisation (Sokolov-Ternov)
- ep (eA) with pp (AA)
●linac-ring
- moderate (~HERA) lumi (~ LHC)
- energy horizon ~ multi-TeV
- less civil engineering impact on LHC
- e-polarisation (source: e+?)
- ep (eA) with pp (AA)
●LHC upgrade: cost
?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
Of ACCELERATOR
SCIENCE and TECHNOLOGY
4.Experiment
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
Sensitivity
●rates: energy can win you TeV2 in Q2
Neutral Current ep ->eX
Charged Current ep ->X
100 fb-1 70 GeV e-ring
10 fb-1 140 GeV e-linac
1 fb-1 HERA (sim)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
IR and Experiment
●IR ±many m
●IR ≥9.4o around beam
THE COCKCROFT INSTITUTE
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SCIENCE and TECHNOLOGY
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Asymmetric Collider
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●asymmetric beam momenta: LHeC
~ TeV
quark
quads for TeV ? e 70-140 GeV
p 7 TeV
electron
●”forward” hemisphere detection to multiTeV
topological challenge
precision challenge
●”backard” hemisphere detection to fewx10 GeV
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
•backward e
IR Kinematics
forward remnant 1C
THE COCKCROFT INSTITUTE
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•forward TeV hadrons
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
ep is precision @ every scale
THE COCKCROFT INSTITUTE
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• Neutral Current
X
epeX
pTmiss
• ep?+lepton+X
pTmiss + lepton
•precision @ TeV scale of lepton+quark
eq νq τq
cf HERA
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
THE COCKCROFT INSTITUTE
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5.When?
Towards a CDR
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Timeline
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● 2007: form working groups + steering committee
initial meeting of conveners + committee
SAC overview
● 2007/8: ECFA/CERN endorsement “work out”
● 2008: workshop I
● 2009: workshop II
LHeC CDR [LHC Committee]
● 2011: LHeC TDR
- construction 8 years ?
- impact on LHC: civil engineering + installation
e-ring and e-linac
- be aware of CLIC progress
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
WG Structure
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● accelerator (injector, ring or linac)
Oliver Bruening (CERN) JBD (CI)
● interaction region (+ small angle detectors)
tba
● infrastructure
CERN + tba
● detector
tba
● the new physics
tba
● precision QCD and electroweak
tba
● physics of high parton density
tba
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
CDR
THE COCKCROFT INSTITUTE
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Accelerator Design [RR and LR]
Closer evaluation of technical realisation: injection, magnets, rf, power efficiency, cavities, ERL…
What are the relative merits of LR and RR? Recommendation.
Interaction Region and Forward Detectors
Design of IR (LR and RR), integration of fwd detectors into beam line.
Infrastructure
Definition of infrastructure - for LR and RR.
Detector Design
A conceptual layout, including alternatives, and its performance [ep and eA].
New Physics at Large Scales
Investigation of the discovery potential for new physics and its relation to the LHC and ILC/CLIC.
Precision QCD and Electroweak Interaction
Quark-gluon dynamics and precision electroweak measurements at the TERA scale.
Physics at High Parton Densities [small x and eA]
QCD and Unitarity, QGP and the relations to nuclear, pA/AA LHC and SHE physics.
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
LHeC Scientific
Advisory Committee
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Experimentalists
Joel Feltesse (Saclay/DESY)
Roland Horisberger (PSI)
Aharon Levy (Tel Aviv)
Richard Milner (MIT)
Allen Caldwell (MPI München) Chair
John Dainton (Univ Liverpool)
Accelerator
Stephen Myers (CERN)
Roland Garoby (CERN)
Swapan Chattopadhyay (Cockcroft Inst) Ferdy Willeke (DESY/BNL)
A Skrinsky (Budker)
Guido Altarelli (Roma)
Lev Lipatov (Petersburg)
Jos Engelen (CERN)
Young-Kee Kim (Fermilab)
Theory
Stan Brodsky (SLAC)
John Ellis (CERN)
Frank Wilczek (MIT)
Labs
Rolf Heuer (DESY)
Peter Bond (BNL)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Steering Group
Oliver Bruening
(CERN)
John Dainton
(Cockcroft)
Albert DeRoeck
(CERN)
Stefano Forte
(Milano)
Max Klein - chair (Liverpool)
Paul Newman (Birmingham)
Emmanuelle Perez (CERN)
Wesley Smith
(Wisconsin)
Bernd Surrow
(MIT)
Katsuo Tokushuku
(KEK)
Urs Wiedemann
(CERN)
•setting up WGs + workshop I
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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4.Summary
EIC Collaboration
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December 7-8th 2007
Now
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●LHeC 70-140e  7000p GeV
- can be built
- has startlingly good luminosity ≥ 1032 cm-2s-1
grows with LHC pp luminosity
- extends substantially, uniquely, and with synergy
to LHCTeV discovery physics
- probes chromodynamics
@ new density frontier
in uniquely comprehensive manner ep eA
with unchallengable precision
synergetically with LHC pp pA AA
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Proposal to ECFA
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As an add-on to the LHC, the LHeC delivers in excess of 1 TeV
to the electron-quark cms system. It accesses high parton
densities ‘beyond’ what is expected to be the unitarity limit. Its
physics is thus fundamental and deserves to be further worked out,
also with respect to the findings at the LHC and the final results
both from the Tevatron and from HERA.
First considerations of a ring-ring and a linac-ring accelerator
layout lead to an unprecedented combination of energy and
luminosity for lepton-hadron physics, exploiting the latest
developments in accelerator and detector technology.
It is thus proposed to hold two workshops (2008 and 2009),
under the auspices of ECFA and CERN, with the goal of having
a Conceptual Design Report on the accelerator, the experiment
and the physics. A Technical Design report will then follow if
appropriate.
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Lepton + quark @ TeV
●energy for
TeV eq discovery
extreme chromodynamics
●precision for
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LHeC and LHC
LHeC and ILC/CLIC
TeV eq discovery
eq understanding
extreme chromodynamics
●luminosity for
TeV eq discovery
●energy range for
QCD phase equilibria
LHeC and LHC
LHeC RHIC FT LHC
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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Extras
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Lepton Ring
●in LEP tunnel … so like LEP
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8
1
7
6
- FODO in eight arcs
5
β-tron phase advance φH=108o φV=90o 2
3
4
- bending radius 3133.3 m
- (δE/Ebeam)rms = 1.1×10-3
LEP=9 W/cm
HERA=13.5 W/cm
- SR 26 W/cm (Ec=254 KeV)
- scRF @ 1GHz resonators @ 12 MV/m scRF proven
@ > 6 MV/m
100 m structure = 670 cells
sync. phase 31o
bucket takes 10× (δE/Ebeam)rms
- unlikely e-beam instability
single bunch current modest
impedance << LEP
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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Interaction Region
●highest lumi
- low βe
close sc quads
- low X-ing angle
“hard” bend
8σ beam sepn
SR fan
sc p-beam
« HERA
top elevation
“crabbed”
(rotated)
p-bunch
V-displaced
3.4 kW
11.4 kW
0.5 mrad
3.2 kW
3.5 mrad
- “crab” RF cavity
p-bunch rotation
●1o beam access = low-lumi/low-x option (cf HERA)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Operational
Luminosity
●beam-beam
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- “hour-glass”
- dynamic β: < HERA
- long range beam-beam (parasitic interactions):
marginal
operational luminosity
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Polarisation @ LHeC
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Barber
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
What’s been achieved
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●Sokolov-Ternov + spin-rotators @ HERA
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
a)
What’s been achieved
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
LHeC
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●tunnel exists (LEP, LHC)
●injection once existed (LEP) ?
●operating p-beam (from 2008)
●operating A-beam (from 2008)
●ep eA operating alongside pp pA AA
●the TeV ep collider !
●”minimal” mods to LHC !
●LHC upgrade
●cost ?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
What’s been achieved
●Sokolov-Ternov @ LEP70 GeV
b)
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Meeting
Stony Brook University
December 7-8th 2007
Diffraction and Rapgap
●rapgap @ LHeC ?
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HERA
LHeC ~ 3
ηmax
rapgap
ηproton
IP + IR
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Acceptance and
Measurement
●70 7000 GeV
●high lumi quads (±10o bp)
Q2e > 100 GeV2 x > 3×10-5
●few GeV ≤ Eh,e ≤ few TeV
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e
jet
●low lumi for low x (no quads)
1 < Q2 < 100 GeV2
x < 3×10-5
“forward” hadrons:
“forward rapgap” instrumentation
precision e/had-measurement
170 < θe < 179o 170 < θh < 179o
!
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
●100/10 fb-1
= 100/LHeC
100/3×LHeC
y y
@ Q2 = 1 TeV2
Rate
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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Needle in a haystack…
QCD jet production
at high energy
Higgs production
Need to use signatures
with small backgrounds:
- Leptons
- High-mass resonances
- Heavy quarks
to avoid being overwhelmed
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Producing a Higgs
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• Higgs couplings
 mass
u-ubar  H
has very small
cross-section
Dominant
production via
vertices coupling
Higgs to heavy
quarks or W/Z
bosons
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
Decay of the SM Higgs
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• Width becomes large as WW mode opens
• Branching ratios change rapidly as new
channels become kinematically accessible
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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W
largeW
=
a)
b)
W
forward elastic
= diffraction
= pomeron
=
forward elastic
= diffraction
= pomeron
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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largeMX
c)
X
=
MX
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
a)
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b)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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LHeC?
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
a)
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b)
EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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EIC Collaboration
Meeting
Stony Brook University
December 7-8th 2007
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a)
b)
X
xIP