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Article
Report number CERN-ATS-2012-135
Title Positron Options for the Linac-Ring LHeC
Author(s) Zimmermann, F (CERN) ; Brüning, O S (CERN) ; Papaphilippou, Y (CERN) ; Schulte, D (CERN) ; Sievers, P (CERN) ; Rinolfi, L (JUAS, Archamps) ; Variola, A (LAL, Orsay) ; Zomer, F (LAL, Orsay) ; Braun, H H (PSI, Villigen) ; Yakimenko, V (Brookhaven) ; Bulyak, E V (Kharkov, KIPT) ; Klein, M (Liverpool U.)
Publication 2012
Imprint 20 May 2012
Number of pages 3
In: Conf. Proc. C1205201 (2012) pp.WEPPR076
In: 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.3108
Subject category Accelerators and Storage Rings
Abstract The full physics program of a future Large Hadron electron Collider (LHeC) [1] 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 rate previously obtained, at the SLAC Linear Collider (SLC). 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, slicedrod 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 sketch some of these concepts, present example parameters; estimate the electrical power required, andmention open questions.
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