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Brainstorming on power converter circuits
10th Meeting of the FCC-ee Layout and Optics Design
Tolerances on the field quality
- Arcs: Manufacturing tolerances have been provided from MSC and we now have numbers for the main dipoles. Need to include corrections in the simulations. Need to extend studies for main quads, etc. For FCC week, manufacturing errors will be provided by MSC and checked with tuning --> TO DO: MSC to provide manufacturing tolerances for all main magnets
- IR: There is nothing at the moment for the IR, MSC needs table of parameters (length etc) to start the design of the magnets and then they will provide --> TO DO: ABP to provide magnet catalog based on latest LCC version to both EPC and MSC, survey files and if there are specific points (BS dump) that needs to integrated
Distance between magnets
- distance between magnets should be made more realistic --> TO DO: increase drift space in the optics
Baseline powering schemes:
1. arc dipoles: in series of 1 circuit for the full octant (arc) and in series with dispersion suppressor dipoles
- for the DS, it's ok to power in series with arc as they can have the same strength (just 2 split dipoles instead of 3 split dipoles)
- for RF, there are some dipoles with different strength for the separation in RF insertion, this will be treated with trims
- investigate if longer time constant is possible (might not be needed)
3. arc quads: half the octant (so 2 families per half octan, 4 families per octant)
5. arc sextupoles: half the octant (so 4 families per half octant, 8 families per octant)
- there are some quads QF3A in each set of 5 repetitive cells that has 1.6% higher strengths, different lengths preferred, same k value --> TO DO: to incorporate this in the optics
6. All quads of the IR/DS should be powered independently
Main quadrupole powering
Both apertures in different power supplies, also gives more ganularity for tapering
Quad trims
Needed at every quad and can be used for tapering, individually powered with small converters, trim of around ~1%
Correctors
- Sextupoles: include V correctors and skew quads, new lattice with correctors and BPMs only at sext locations to be provided soon. Studies to define if V correctors and skew quads can indeed be included in sextupoles
- Dipoles: H correctors as additional windings
---> TODO: Corrector parameters to be provided inductance and resistance
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