
Additional Requirements
Downstream undulator must be at 180mm ±0.1mm
Upstream undulator must be at 180mm ±0.1mm
X-ray BPMs not used because the two undulators move to any combination of gap postions
Both undulators must be at the same gap position ±0.5mm
X-ray BPMs not used because CPU in upstream location

X-ray BPMs not used because SCU0 is in downstream location

Both undulators must be at the same gap position ±0.5mm
Upstream gap position must be at 180mm ±0.1mm

Downstream gap must be at 10.7mm ±0.1mm




Downstream undulator must be at 10.78mm ±0.1mm














Both undulators must be at the same gap position ±0.5mm
Grid X-ray BPMs are currently not in orbit correction
Both undulators must be at the same gap position ±0.5mm






Gap Thresholds for in-use X-ray BPMs Listed below are the gap position thresholds for X-ray BPMs, above which the X-ray BPM signals may not be strong enough to give accurate readings or orbit disturbances have occurred in the past. Although the X-ray BPMs remain in the configuration, the gain is set to zero which removes their input from orbit control during the time the gap position is above the threshold. If a sector has two undulators and is not canted, an additional requirement of one undulator gap position remaining fixed or both undulators having the the same gap position exists. Canted beamlines can move their undulators independently and each undulator has its own threshold.
Sector No.	Threshold in mm	Additional Requirements
1	25.0 for US	Downstream undulator must be at 180mm ±0.1mm
1	25.0 for DS	Upstream undulator must be at 180mm ±0.1mm
2	31.0	X-ray BPMs not used because the two undulators move to any combination of gap postions
3	31.0	Both undulators must be at the same gap position ±0.5mm
4	31.0	X-ray BPMs not used because CPU in upstream location
5	31.0
6	31.0	X-ray BPMs not used because SCU0 is in downstream location
7	31.0
8	31.0	Both undulators must be at the same gap position ±0.5mm
9	25.0	Upstream gap position must be at 180mm ±0.1mm
10	31.0
11	25.0	Downstream gap must be at 10.7mm ±0.1mm
12	28.0 for US
12	31.0 for DS
13	31.0 for US
13	31.0 for DS
14	25.0	Downstream undulator must be at 10.78mm ±0.1mm
15	31.0
16	28.0 for US
16	28.0 for DS
17	31.0
18	31.0
19	30.0
20	31.0
21	25.0 for US
21	25.0 for DS
22	24.0
23	31.0 for US
23	31.0 for DS
24	31.0 for US
24	26.0 for DS
26	31.0	Both undulators must be at the same gap position ±0.5mm
27	31.0	Grid X-ray BPMs are currently not in orbit correction
30	31.0	Both undulators must be at the same gap position ±0.5mm
31	25.0
32	29.0
33	31.0
34	31.0 for US
34	31.0 for DS