R.Chehab (a), X.Artru (b), V.Baier (c), K.Beloborodov (c), S.Burdin (c), A.Bukin (c), G.Bochek(d), A.Bogdanov (e), M.Chevallier (b), R.Cizeron (a),D.Dauvergne (b), M.Dubrovin (c,f), V.Druzhinin (c), T.Dimova (c), L.Gatignon (g), V.Golubev (c), A.Jejcic (h), P.Keppler (j), R.Kirsch (b), V.Kulibaba (d), Ph.Lautesse (b), J.Major (j), N.Maslov (d), J-C.Poizat (b), A.Potylitsin, J.Remillieux (b), S.Serednyakov (c), V.Shary (c), V.Strakhovenko (c), C.Sylvia (a), I.Vnukov (e)
Numerical simulations and 'proof of principle' experiments showed clearly the interest of using crystals as photon generators dedicated to intense positron sources for linear colliders. An experimental investigation, using a 10 GeV secondary electron beam, of the SPS-CERN, impinging on an axially oriented thick tungsten crystal, has been prepared and operated between May and September 2000.
After a short recall on the main features of positron sources using channeling in oriented crystals, the experimental set-up is described. A particular emphasis is put on the positron detector made of a drift chamber, partially immersed in a magnetic field. The energy spectrum as the emittance of the produced positrons are derived from the collected data. The energy radiated as the photon multiplicity are also measured. The preliminary results of the experiment are presented.
(a) LAL-IN2P3 (CNRS)- 91898-ORSAY Cedex (France)
(b) IPNL- IN2P3 (CNRS)- 69622-VILLEURBANNE Cedex (France)
(c) BINP-630090-NOVOSIBIRSK (Russia)
(d) KIPT- 310108- KHARKOV (Ukraine)
(e) NPI-TPU 634050-TOMSK (Russia)
(f) Wayne State University at Cornell, Ithaca NY 14853 (US)
(g) CERN-Geneva (Switzerland)
(h) LMD -Universite Paris-Jussieu (France)
(j) Max-Planck Institute 70569-STUTTGART (Germany)
(*) Research made in the framework of INTAS Contract 97-562
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