This plot(PS) shows the 5L-tuning, i.e quadrupole currents as function of tune shifts (top to bottom: data, fit, difference), and the coefficients are given in the snap file.
The modulator and the chicane together affect strongly the emittance of the storage ring and also circumference, energy loss per turn and momentum compaction. See data in the table below and compare to F6T without chicane.
This optics will be used for FEMTO commissioning with closed modulator, after using F6CWO for start-up in April 2006.
The picture above shows the dispersion for the FEMTO satellite beams.
| Circumference [m] | 288.0073 |
| Working Point Qx / Qy | 20.43 / 8.72 |
| Natural chromaticities | -67.3 / -20.9 |
| Corrected chromaticities | +5 / +5 |
| Momentum compaction factor | 6.05E-4 |
| Horizontal emittance at 2.4 GeV [nm rad] | 7.37 |
| rms relative energy spread at 2.4 GeV | 8.64E-4 |
| Energy loss per turn (no IDs) [keV] | 569 (incl. W138 + U19) |
| Short straight: Beta_x / Beta_y / Disp [m] | 1.38 / 1.00 / 0.00 |
| Medium straight: Beta_x / Beta_y / Disp [m] | 2.26 / 2.50 / 0.00 |
| Long straight: Beta_x / Beta_y / Disp [m] | 4.52 / 5.00 / 0.00 |
| FEMTO radiator: Beta_x / Beta_y / Disp [m] | 8.32 / 0.52 / 0.00 (alfa_x = -2.1) |
| Maximum values: Beta_x / Beta_y / Disp [m] | 23.1 / 23.7 / 0.35 |
F6 snap file for upload to control system, also includes current settings for the chicane magnets.
F6C Lattice file composed from database as input for TRACY. Since undulators and wigglers are not implemented in Tracy, the modulator was replaced by a series of small dipole magnets (like OPA does it internally), whereas the radiator is treated as drift space.
F6C listing of beta functions (TRACY).