Highlight scenes of the reconstruction
workHigh-brilliance project of the Photon Factory storage ring
The 2.5-GeV Photon Factory storage ring has been reconstructed to the low-emittance lattice configuration. The new lattice will result in a higher brilliance of the synchrotron radiation, typically by one order of magnitude at the insertion device beamlines.
Highlight scenes of the reconstruction
work
New low-emittance lattice
Beam parameters
Comparison of the beam parameters between the new and the old lattice configurations.
New lattice |
Old lattice | |||
| Phase advance/cell | 90 deg. | 105 deg. | 135 deg. | |
| Natural beam emittance (nm*rad) | 44 | 33 | 27 | 130 |
| Betatron tune (horizontal) | 9.27 | 9.85 | 10.85 | 8.44 |
| Betatron tune (vertical) | 3.67 | 4.20 | 4.20 | 3.30 |
| Natural chromaticity (horizontal) | -12.2 | -14.1 | -16.1 | -13.5 |
| Natural chromaticity (vertical) | -10.4 | -12.0 | -13.3 | -9.0 |
| Natural energy spread | 7.3e-4 | 7.3e-4 | 7.3e-4 | 73e-4 |
| Momentum compaction factor | 0.0079 | 0.0061 | 0.0043 | 0.016 |
| RF voltage (MV) | 1.5 | 1.5 | 1.5 | 1.7 |
| Synchrotron tune | 0.015 | 0.013 | 0.011 | 0.023 |
| Natural bunch length (cm) | 1.14 | 1.00 | 0.84 | 1.52 |
| Transverse damping time (msec) | 7.8 | 7.8 | 7.8 | 7.8 |
| Longitudinal damping time (msec) | 3.9 | 3.9 | 3.9 | 3.9 |
Note:
1) Under the new lattice configuration, we can operate with three low-emittance optics (90, 105 and 135 degrees/cell) and another medium-emittance optics which is very similar to the old optics.
2) The PF storage ring is initially commissioned under the medium-emittance optics. This allows us to restart the user runs very quickly. The low-emittance optics will be investigated and tuned after that.
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