Accelerator Complex
The SCT factory is a symmetric electron-positron collider consisting of the following installations:
- Positron injector with cooling storage ring
- Injector of polarized electrons
- Linear accelerator producing the beams at the energy of the experiment
- Double ring collider
Collider
The collider has the following features:
- high single-bunch luminosity due to the Crab Waist collision scheme with large Piwinski angle and submillimeter vertical beta function at the interaction point;
- multi-bunch regime, which implies the use of the double ring scheme;
- the final focus on the basis of superconducting quadrupole lenses, providing a small beta function;
- small horizontal and vertical beam emittances;
- high intensity of a short bunch (∼10 mm);
- effective control of the damping parameters (emittance, damping time, etc.) to ensure maximum luminosity in the entire energy range;
- high level of longitudinal polarization of the electron beam in the entire energy range.
| Parameter | 1.5 GeV | 2.5 GeV | 3.5 GeV |
|---|---|---|---|
| Perimeter, \(\Pi\) (m) | 632.94 | ||
| Beams crossing angle, \(2\theta\) (mrad) | 60 | ||
| RF frequency, \(f_0\) (MHz) | 350 | ||
| Beta function at the interaction point \(\beta_x^*/\beta_y^*\) (mm) | 100/1 | ||
| Number of bunches | 292 | 328 | 262 |
| Number of electrons in each bunch (\(10^{10}\)) | 9 | 8 | 9 |
| Beam current \(I\) (A) | 2 | ||
| \(\xi_x/\xi_y\) | 0.007/0.15 | 0.003/0.1 | 0.004/0.08 |
| Luminosity, \(L\) (\(10^{35}\) cm\({}^{-2}\)s\({}^{-1}\)) | 0.8 | 1.0 | 1.0 |
Injector
The SCT injector contains a number of acceleration modules. Each acceleration module consists of klystron, power multiplication system, and two acceleration sections. The injector provides top-up injection electrons and positrons at the experiment energy with frequency of 50 Hz.