Abstract
The CLIC (Compact Linear Collider), as future linear collider, requires an intense positron source. A brief history is given up to the present baseline configuration which 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 target”, the positron production scheme is based on the channeling process. A 5GeV electron beam impinges on a thin crystal tungsten target aligned along its 〈111〉 axis, enhancing the photon production by channeling radiation. A large number of photons are 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 are an option for CLIC, which needs R&D. Some brilliant positron sources are briefly reviewed.
Highlights
A very brief history of the CLIC (Compact Linear Collider) study is given in the paragraph
The CLIC study has been presented in major conferences (PAC, EPAC, IPAC, Linear Accelerator,...), in the 3 CLIC workshops (2007, 2008, 2009) and in all Linear Colliders workshops (LCWS), since the years 1990’s
Collaboration started with the ILC (International Linear Collider), it considers the undulator as the baseline for positron source
Summary
A very brief history of the CLIC (Compact Linear Collider) study is given in the paragraph. A possible design of a multi-TeV linear collider is described in [1]. The CLIC study has been presented in major conferences (PAC, EPAC, IPAC, Linear Accelerator,...), in the 3 CLIC workshops (2007, 2008, 2009) and in all Linear Colliders workshops (LCWS), since the years 1990’s. The study of the CLIC positron source started in 1994, based on conventional target. Collaboration started with the ILC (International Linear Collider), it considers the undulator as the baseline for positron source. The present beam parameters and the corresponding layout for the main beam injector complex are given. The studies based on conventional positron sources are described first, followed by the studies optimizing hybrid targets configuration where channeling process occurs.
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