Fast Horizontal and Vertical Correctors

The most effective correction is obtained when the correctors are located as near as possible to the sources of generating the largest orbit deviations, i.e. the quadrupoles. There are 40 horizontal and 40 vertical air core fast steering magnets used for fast orbit feedback in PETRA III. In the old octant 11 fast correctors are placed per plane. They are distributed with 1 per short straight & 1 at the beginning and end of each long straight section. There are 29 fast correctors in the new octant. They are located in a DBA cell as shown below.

The maximum strength a fast corrector can impart is 25mrad. But with 1mm ground vibration displacement the fast orbit correction scheme indicates that a maximum of 5mrad kick strength is sufficient.

q_max ≈ 5 µrad è B*l = 1 G.m

Monitors (resolution) requirement for Fast Orbit Correction

monitors	#	Horz. (µm)	Vert. (µm)
Old octant	149	10	10
New octant	50	2	0.5
Next to IDs	18	2	0.2

Phase advances among the fast Horizontal Correctors in the new octant:

Phase advances among the fast Vertical Correctors in the new octant:

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