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- L. Serafini, I. Boscolo, F. Broggi, V. Petrillo
Istituto Nazionale di Fisica Nucleare, Milano, Italy
- O. Adriani, G. Graziani, G. Passaleva
INFN-FI, Sesto Fiorentino, Italy
- S. Albergo, A. Tricomi
INFN-CT, Catania, Italy
- D. Alesini, M.P. Anania, A. Bacci, R. Bedogni, M. Bellaveglia, C. Biscari, R. Boni, M. Boscolo, M. Castellano, E. Chiadroni, A. Clozza, E. Di Pasquale, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, A. Gallo, G. Gatti, A. Ghigo, F. Marcellini, C. Maroli, G. Mazzitelli, E. Pace, L. Pellegrino, R. Ricci, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, P. Tomassini, C. Vaccarezza, S. Vescovi, F. Villa
INFN/LNF, Frascati (Roma), Italy
- D. Angal-Kalinin, J.A. Clarke, B.D. Fell, A.R. Goulden, J.D. Herbert, S.P. Jamison, P.A. McIntosh, R.J. Smith, S.L. Smith
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- P. Antici, M. Coppola, L. Lancia, A. Mostacci, L. Palumbo
URLS, Rome, Italy
- N. Bliss, B.G. Martlew
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
- P. Cardarelli, M. Gambaccini
INFN-Ferrara, Ferrara, Italy
- L. Catani, A. Cianchi
INFN-Roma II, Roma, Italy
- I. Chaikovska, O. Dadoun, A. Stocchi, A. Variola, Z.F. Zomer
LAL, Orsay, France
- C. De Martinis
INFN/LASA, Segrate (MI), Italy
- F. Druon, P. Fichot
ILE, Palaiseau Cedex, France
- E. Iarocci
University of Rome "La Sapienza", Rome, Italy
- M. Migliorati
Rome University La Sapienza, Roma, Italy
- A.-S. Müller
IN2P3, Paris, France
- V. Nardone
Università di Roma I La Sapienza, Roma, Italy
- C. Ronsivalle
ENEA C.R. Frascati, Frascati (Roma), Italy
- M. Veltri
Uniurb, Urbino (PU), Italy
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- F. Zimmermann, O.S. Brüning, Y. Papaphilippou, D. Schulte, P. Sievers
CERN, Geneva, Switzerland
- H.-H. Braun
Paul Scherrer Institut, Villigen, Switzerland
- E.V. Bulyak
NSC/KIPT, Kharkov, Ukraine
- M. Klein
The University of Liverpool, Liverpool, United Kingdom
- L. Rinolfi
JUAS, Archamps, France
- A. Variola, Z.F. Zomer
LAL, Orsay, France
- V. Yakimenko
BNL, Upton, Long Island, New York, USA
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The full physics program of a future Large Hadron electron Collider (LHeC) requires both pe+ and pe- collisions. For a pulsed 140-GeV or an ERL-based 60-GeV Linac-Ring LHeC this implies a challenging rate of, respectively, about 1.8·1015 or 4.4·1016 e+/s at the collision point, which is about 300 or 7000 times the past SLC rate. We consider providing this e+ rate through a combination of measures: (1) Reducing the required production rate from the e+ target through colliding e+ (and the LHC protons) several times before deceleration, by reusing the e+ over several acceleration/deceleration cycles, and by cooling them, e.g., with a compact tri-ring scheme or a conventional damping ring in the SPS tunnel. (2) Using an advanced target, e.g., W-granules, rotating wheel, sliced-rod converter, or liquid metal jet, for converting gamma rays to e+. (3) Selecting the most powerful of several proposed gamma sources, namely Compton ERL, Compton storage ring, coherent pair production in a strong laser, or high-field undulator radiation from the high-energy lepton beam. We describe the various concepts, present example parameters, estimate the electrical power required, and mention open questions.
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