| Magnet Unit(s) | PR10:7012 PR10:9012 |
|---|---|
| Typical BDES | -38.702 kG |
| Typical Current | 120 A |
| Typical PS Voltage | 30 V |
| Nominal Beta X | 9.3 m |
| Nominal Eta X | 0.0 m |
| Nominal Beta Y | 26 m |
| Nominal Eta Y | 0.0 m |
QDS0E is part of of the dispersion suppression scheme for the half arcs which are adjacent to the injection straight 10.
In general the HER arcs have QFs and QDs each powered in series for the whole ring except for the seven quadrupole magnets at the beginning and end of the arc. For a general HER arc, these first/last seven are used to cancel the dispersion going into the adjacent straights, and to generate a dispersion mismatch in the arc which controls (increases) the horizontal beam emittance. The HER arcs not adjacent to IR2 (generally) have these "dispersion suppressor" quads powered together by one power supply for each family member (eg QFS2 appears eight times in the four non-IR2 adjacent arcs such that eight QFS2 magnets share one power supply called QFS2E).
Technically speaking the QDS0 magnets are not actually in the arcs, rather they are the first/last quadrupoles before/after each arc. It is proper however to include the QDS0 family of magnets (technically in the straights) as part of the arc dispersion suppression scheme.
Arcs 9 and 11 (being adjacent to the injection straight 10) have this separate power supply for the QDS0 suppression family member pair surrounding straight 10 to allow tunability of the beta functions in the injection straight.