Overview
The SESAME Storage Ring is a 133.2 circumference and 2.5GeV energy one. The 8-fold Storage Ring lattice is a simple Double Bend Achromat (DBA) one composed of 16 mirror-image cells with 16 dispersive sections. Each cell contains one combined-function Bending Magnet (BM) flanked by two Focusing Quadrupoles (QF), two Defocusing ones (QD), two Focusing Sextupoles (SF) and two Defocusing ones (SD).
The Storage Ring offers a maximum capacity of 25 beamlines. The storage ring is filled with electrons at 800MeV at a repetition rate 1Hz, then its energy is ramped to the operational value 2.5 GeV.
One cell and the main parameters of the Storage Ring are shown and listed in the Figure and Table below respectively.
| Parameter | Unit | Value | |
|---|---|---|---|
| Energy | GeV | 2.5 | |
| Circumference | m | 133.2 | |
| Betatron tunes Qx / Qz | 7.23 / 6.19 | ||
| Number of super-periods | 8 | ||
| Bending Dipole field | T | 1.45545 | |
| Field gradient | T/m | -2.794 | |
| Natural Chromaticities H / V | -15.15 / -20.56 | ||
| Energy loss / turn | keV | 590.2 | |
| Damping time τE / τx / τz | msec | 2.74/2.32/3.76 | |
| RMS energy spread σE | % | 0.1073 | |
| Natural emittances ɛx / ɛy | nm.rad | 25.74 / 0.2574 | |
| Betatron coupling | % | 1 | |
| RF Parameters | Unit | Value | |
|---|---|---|---|
| Frequency | MHz | 499.654097 | |
| Harmonic Number | 222 | ||
| Peak Voltage | MV | 2.4 | |
| RF acceptance (ɛRF) | % | 1.463 | |
| Synchrotron tune | 0.0165 | ||
| Synchrotron frequency (νs) | kHz | 37.147 | |
| Natural bunch length (σL) | mm | 11.42 | |
| Max current (200 bunch) | mA | 400 | |
