Opportunities to obtain polarization at CEPC

2019 ◽  
Vol 34 (13n14) ◽  
pp. 1940004 ◽  
Author(s):  
Sergei Nikitin
Keyword(s):  
Longitudinal Polarization ◽  
Electron Positron ◽  
Positron Beams

The possibility to obtain the transversely polarized electron/positron beams at the [Formula: see text] GeV CEPC collider basing on the radiative self-polarization of particles in the main rings is under consideration. In addition, we consider one of the options for obtaining longitudinal polarization of electrons at CEPC.

Polarization issues in circular electron–positron super-colliders

2020 ◽  
Vol 35 (15n16) ◽  
pp. 2041001 ◽  
Author(s):  
Sergei Nikitin
Keyword(s):  
Spin Diffusion ◽  
Longitudinal Polarization ◽  
Electron Positron ◽  
Main Ring ◽  
Positron Beams ◽  
Field Errors ◽  
Long Term Preservation ◽  
Large Spin

We study a possibility of obtaining transversely polarized electron/positron beams in the CEPC collider. Also, original results are presented for another project, the FCCee collider, which allows us to identify some features and differences of these similar machines. Important is the comparison of the data obtained with the expected and measured polarizations at LEP. In estimation of the depolarizing effect of field errors, in addition to the usual nonresonant spin diffusion, an attempt was made to take into account the resonant diffusion, which is due to a large spin tune spread. We consider a possibility to obtain polarization by accelerating polarized particles in the CEPC booster and then injecting them into the main ring. This option can be crucial for obtaining longitudinal polarization. We propose a scheme in which long-term preservation of such polarization is possible.

CEPC Linac design

2019 ◽  
Vol 34 (13n14) ◽  
pp. 1940005 ◽  
Author(s):  
Cai Meng ◽  
Jingru Zhang ◽  
Xiaoping Li ◽  
Guoxi Pei ◽  
Dou Wang ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Repetition Frequency ◽  
Positron Source ◽  
Electron Positron ◽  
Transport Line ◽  
Simulation Results ◽  
Positron Beams

The Circular Electron–Positron Collider (CEPC) is a 100-km ring [Formula: see text] collider for a Higgs factory. The injector of CEPC is composed of Linac and Booster. The Linac is a normal conducting S-band Linac with a frequency of 2860 MHz; it provides electron and positron beams at an energy of up to 10 GeV with 100 Hz repetition frequency of 100 Hz. The Linac design and dynamic simulation results are discussed in detail in this paper, including electron bunching system, positron source, electron bypass transport line, damping ring and main Linacs.

Pair production of particles with spin 5/2 in colliding electron-positron beams

1980 ◽  
Vol 23 (11) ◽  
pp. 947-952
Author(s):  
O. A. Vasil'ev ◽  
A. I. Mukhtarov
Keyword(s):  
Pair Production ◽  
Electron Positron ◽  
Positron Beams

Creation of excited leptons in colliding electron-positron beams

1992 ◽  
Vol 35 (6) ◽  
pp. 513-518
Author(s):  
M. Hayashi ◽  
N. V. Samsonenko ◽  
M. A. Rozas Teglio
Keyword(s):  
Electron Positron ◽  
Positron Beams
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