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 August 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 enhancement in photon and positron production in the aligned crystal have been observed in the energy range 5 to 40 GeV, for the incident electrons, in crystals of 4 and 8 mm as in an hybrid target. The first results concerning this experiment are presented hereafter.
@article{arxiv.physics/0008036,
title = {Experimental Determination of the Characteristics of a Positron Source Using Channeling},
author = {R. Chehab and R. Cizeron and C. Sylvia and V. Baier and K. Beloborodov and A. Bukin and S. Burdin and T. Dimova and A. Drozdetsky and V. Druzhinin and M. Dubrovin and V. Golubev and S. Serednyakov and V. Shary and V. Strakhovenko and X. Artru and M. Chevallier and D. Dauvergne and R. Kirsch and Ph. Lautesse and J-C. Poizat and J. Remillieux and A. Jejcic and P. Keppler and J. Major and L. Gatignon and G. Bochek and V. Kulibaba and N. Maslov and A. Bogdanov and A. Potylitsin and I. Vnukov},
journal= {arXiv preprint arXiv:physics/0008036},
year = {2008}
}