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39th FCC-ee Optics design meeting
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Europe/Zurich
6/R-012 - conference room (CERN)
FCC Beam Instruments, Jorg Wenninger
Jorg Wenninger presented the FCC-ee instrumentation requirement for the BI group.
BPM:
It will be asked to to install BPMs at every quadrupoles that can measure beam position in both planes (H&V). The measurements at the BPMs should be turn-by-turn and also bunch by bunch, as asked by Katsunobu.
Jorg presented also a table of parameter for the BPM specification. The alignment of the machine is a very critical point, and Jorg showed that the tolerance, if too low, of the machine to misalignments can be reached within a few month.
The beam based alignment was discussed, which can not be so straight forward for sextupoles.
Feedback on the orbit is necessary.
Tune measurements: as in LHC, a feedback in tune will be asked.
Beam emittance: synchrotron radiation monitor can be use to measure the emittances as in LHC. The measurements must be bunch by bunch. For low current operations, fast wire scanners can be used as for cross check calibration. However, the beam size is about 22microm, which would be impossible to measure with wire based device.
Bunch length
Bunch length are necessary for energy calibration, and so far, currently technology as wallcurrent monitors might not be accurate enough (0.1 to 0.5% accuracy needed). As the others devices, the measurements should be bunch-by-bunch.
The meeting with the BI people is foreseen the 26th of September.
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