| Magnet Unit(s) | All HER defocussing sextupoles in arcs 5,7,9 and 11 |
|---|---|
| Typical BDES | -242.73 kG/m |
| Typical Current | 120 A |
| Typical PS Voltage | 400 V |
| Nominal Beta X | 10 m |
| Nominal Eta X | varies |
| Nominal Beta Y | 26 m |
| Nominal Eta Y | 0.0 m |
HER SD powers all of the SD magnets in arcs 5,7,9 and 11.
All 6 HER arcs have SF and SD magnets.
The four arcs not adjacent to collision straight IR2 have their chromatic correction (SF/SD layout) done the same way. These arcs have 12 SFs and 12 SDs (each powered in series for all four arcs). While the arc has 16 cells ("room" for 16 SF/SD pairs), only 12 cells are used for chromatic correction. The inner 12 cells of the arc are where the SF/SD magnets are situated. This allows for uniform beta functions at all SF/SD sextupoles. The outer cells at the beginning/end of the arcs have beta functions modulated as a result of the dispersion suppression scheme.
Arcs 1 and 3 have have strong localized SF/SD magnets to compenstate locally for the chromatic effects of the collision point beta function squeeze.