Speaker
Dr
L. Rinolfi
(CERN)
Description
The CLIC (Compact Linear Collider), as future linear collider, requires intense positron source. For the baseline configuration, it assumes unpolarized beams. A conventional scheme, with a single tungsten target as source of e-e+ pairs, has been studied several years ago. But, in order to reduce the beam energy deposition on the e+ target converter, a double-target system has been studied and proposed as baseline for CLIC. With this “hybrid targets”, the positron production scheme is based on channeling process. A 5 GeV electron beam impinges on a thin crystal tungsten target aligned along its <111> axis, enhancing the photon production with channeling radiation. The large number of photons is sent to a thick amorphous tungsten target, generating large number of e-e+ pairs, while the charged particles are bent away, reducing the deposited energy and the PEDD (Peak Energy Deposition Density). The targets parameters are optimized for the positron production. Polarized positron beams, is an option for CLIC, which needs much further R&D and will be simply mentioned. Some other brilliant positron sources (ILC, LHeC, SuperB,…) will also be briefly reviewed.
Primary author
Dr
L. Rinolfi
(CERN)
Co-authors
Dr
A. Variola
(LAL, Orsay)
Dr
O. Dadoun
(LAL, Orsay)
Dr
Robert Chehab
(IPNL, Lyon)
Dr
V. Strakhovenko
(BINP, Novosibirsk)
