Electron Storage Ring
Parameters of NewSUBARU electron storage ring
| Beam energy | ||
|---|---|---|
| Injection | 1.0 GeV | |
| Stored beam | 1.0 - 1.5 GeV | |
| Circumference | 118.731m | |
| Lattice | DBA + Inverse Bending mag. | |
| Bending Magnets | Number of Bends 12 | |
| Radius of curvature 3.2168m | ||
| Field Strength 1.035 T (@1GeV) | ||
| Inberese Bending Magnets | Number of Inv.Bends 6 | |
| Radius of curvature -3.2168m | ||
| Field Strength 1.035 T (@1GeV) | ||
| Qadrupole magnets | ||
| Arc | 2 families (16) | |
| Short Straight Section | 2 families (24) | |
| Long Straight Section | 2 families (12) | |
| Length of Long straight section | ||
| Short Straight Section | 2.6 m | |
| Long Straight Section | 14 m | |
| &beta function | Horizontal / Vertical | |
| Short Straight Section | 8.61 m / 8.66 m | |
| Long Straight Section | 1.49 m / 8.05 m | |
| 0 degree emission point of bend | 3.32 m / 24.49 m | |
| 10 degree emission point of bend | 1.91 m / 26.88 m | |
| &alpha function | Horizontal / vertical | |
| Short Straight Section | 0 / 0 | |
| Long Straight Section | 0 / 0 | |
| 0 degree emission point of bend | 0.78 / 2.74 | |
| 10 degree emission point of bend | -0.051136364 | |
| &gamma function | Horizontal / vertical | |
| Short Straight Section | 0.12 m-1 / 0.12 m-1 | |
| Long Straight Section | 0.67 m-1 / 0.12 m-1 | |
| 0 degree emission point of bend | 0.48 m-1 / 0.34 m-1 | |
| 10 degree emission point of bend | 0.54 m-1 / 0.50 m-1 | |
| dispersion | ||
| Short Straight Section | 0 m | |
| Long Straight Section | 0 m | |
| 0 degree emission point of bend | 0.03 m | |
| 10 degree emission point of bend | 0.16 m | |
| Betatron tunes | Horizontal: 6.30, vertical:2.23 | |
| Energy spread | 0.04 % (@1.0GeV) | |
| Momentum Compaction Factor | Normal operation: 1.3x10-3 | |
| chromaticity | Horizontal:2.9, Vertical:5.6 | |
| Stored current | ||
| MAX. | 500 mA | |
| 1.0GeV user time | 220mA (Top-up) | |
| 1.5GeV user time | < 400mA (decay) | |
| Natural Emittance | 37 nmrad (@1.0GeV) | |
| X-Y coupling | 1% | |
| Revolution frequency / period | 2.53 MHz / 396 ns | |
| RF frequency | 499.955 MHz | |
| Harmonic number | 198 | |
| RF voltage (Max.) | 500 kV | |
| Radiation loss per turn | 33.4 keV (@1GeV) | |
| Critical energy / Critical wavelength | 0.7 keV / 1.8nm (@1GeV) | |
| Beam lifetime | 12 hrs (@1GeV, 100mA) | |
| 18 hrs (@1.5GeV, 100mA) | ||
| Bunch length (&sigma) | 33ps (Normal operation) | |
| 2.4ps (Low &alpha operation) | ||
| Electron beam size (&sigma) | Horizontal / vertical (@1GeV) | |
| Short Straight Section | 5.6X10-4 m / 5.9X10-5 m | |
| Long Straight Section | 2.3X10-4 m / 5.7X10-5 m | |
| 0 degree emission point of bend | 1.8X10-4 m / 9.2X10-5 m | |
| 10 degree emission point of bend | 1.6X10-4 m / 8.5X10-5 m | |
| divergence | Horizontal / Vertical (@1GeV) | |
| Short Straight Section | 6.6X10-5 / 6.8X10-6 | |
| Long Straight Section | 1.6X10-4 / 7.0X10-6 | |
| 0 degree emission point of bend | 2.1X10-4 / 4.4X10-6 | |
| 10 degree emission point of bend | 2.3X10-4 / 4.7X10-6 | |
|
Stability of COD (with auto COD corr.) |
Horizontal:under 10 um, vertical:under 10 um |
|
| Vacuum Pressure | ||
| Off beam | 10-9Pa ~ 10-8Pa | |
| On beam | 10-8Pa ~ 10-6Pa | |
Betatron and dispersion functions along a half circumference of NewSUBARU storage ring.
