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The Electron Nucleon Collider a possible future upgrade to FAIR F. Maas Helmholtz Institute Mainz NuPECC town meeting May 31 - June 2, 2010 CSIC, Madrid

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Scientific Goals - Challenge: understand the structure of hadrons and their excited states from first principles - Predict hadronic properties and processes with good and controlled precision. - Ideal probe: CC neutrino and anti-neutrino interactions - More realistic: interaction of polarized charged lepton beams with polarized p and d - dominated by γ exchange at Q 2 M 2 Z,W, coupling to quark charges only- doubly polarized: projecting helicities - Spin flavour structure of quarks f, g (longitudinal), h(transverse) and polarized Gluons - Effects of finite transverse size, correlation of b and x, orbital angular momentum, GPDs - Effects of transverse momentum k of quarks, gauge links

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High Energy Lepton Scattering inclusive Scattering (lepton only), exclusive Scattering (complete final state: lepton, photon, proton), semi-inclusive scattering

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High luminosity lepton-nucleon collider - The electromagnetic probe: precision of the EW interaction, but needs high luminosity - Lepton scattering on hadron targets in new regimes yielded new insights, e.g. DIS, EMC effect, Glue - new regimes: Exclusive reactions, Semiinclusive Deep Inelastic Scattering - High E cm yields a large range of x, Q 2 x range: valence, sea quarks, glue Q 2 range: evolution equations of QCD- High polarization of lepton, nucleon achievable dilution in fixed target experiments- Collider geometry allows complete reconstruction of final state

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30 Years of Deep Inelastic Scattering Analysis of DIS in terms of pQCD

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Energy/Luminosity Landscape ENC Electron Nucleon Collider: - high energy - high luminosity - polarisation LHeC

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Unpolarised Parton Distributions ValenceSea

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Understanding Origin of Nucleon Spin

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Generalized Parton Distributions (GPDs): 3D picture of the nucleon, Angular Momentum Sum Rule

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Transverse Momentum Dependent Parton Distributions QCD prediction: transversely polarised target in PANDA; PAX

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Study of Beam Dynamics: Beam equilibria and luminosities Study of Spin Dynamics: Spin resonances in SIS18 and HESR

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Andreas Jankowiak, Institut für Kernphysik, Johannes Gutenberg – University Mainz idea: P e-e- pol. e - -inj. L > /cm 2 s s 1/2 > 10GeV (3.3GeV e - 15GeV p) polarised e - ( > 80%) polarised p / d ( > 80%) (transversal + longitudinal) using the PANDA detector Common effort of German Universities (Bonn, Mainz, Dortmund) plus collaboration with Research Centres FZJ, DESY, GSI,... HESR pRing eRing PANDA 8MV eCool

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Andreas Jankowiak, Institut für Kernphysik, Johannes Gutenberg – University Mainz The eRing 24to dipole, 4.3to quadrupole both nc eRing dipole: ca. 0.4m×0.25m and 1.6to for 4m length eRing inside the HESR tunnel ! In addition: - cavities - spin-manipulation - injection/extraction - feedback -...

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Andreas Jankowiak, Institut für Kernphysik, Johannes Gutenberg – University Mainz HESR / 15GeV peRing / 3.3GeV L [circumference, m] R [bending radius, m]3025 norm / geo [mm mrad ]2 / 0.13 IP [m] 0.1 r IP [mm] / IP [mrad]0.111 / 1.12 l [bunch length, m]0.1< 0.1 n [particle / bunch ]3.623 I b [bunch current, mA] h [bunches / ring] 200 I [total current, A] P SR [sr-Power, kW] / [kW/m]1590 / 10 f coll [collision freq., MHz] coll [bunch distance, m] Δ Q sc 0.1 [beam beam parameter] Luminosität [1/(cm 2 s)] (inc. 80% hour glass red.) · P [polarisation, %]80% needs 8.2MV eCool IR + detector design bunching process B-factory design x 2 possible under collision? polarisation preservation? polarisation?

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27 GeV compass hermes JLab ( upgraded ) Q2Q2 EIC HERA ENC JLab12 EIC ENC Q2Q2

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L dt (fb -1 ) E CM (GeV) Science reach as a function of E CM and integrated luminosity gluon saturation sin 2 θ W DIS nucleon structure exclusive, electroweak processes x min ~ x min ~ x min ~ fb -1 quarks, gluons in nuclei 4 X 250 MeRHIC 10 X 250 EIC 3 X 15 ENC

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- A polarized Electron-Nucleon-Collider L /cm 2 /s s 200 GeV 2 - add 3 GeV electron beam in HESR tunnel to 15 GeV protons - polarised proton source - needs 8 MeV electron cooling - highly polarised electron and nucleon beam - factor of 100 higher FOM in doubly polarised channels - (slightly) modified PANDA detector with shifted IR - first step in IR-design, polarisation - great potential for exploring the structure of the nucleon Summary

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