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FCC-ee optics tuning WG

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354/1-016 (CERN)

354/1-016

CERN

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FCC-ee optics tuning WG meeting
Zoom Meeting ID
65516078996
Host
Rogelio Tomas Garcia
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J. Keintzel reminds that we are now in the reference design phase. Furthermore an IPAC paper on FCC tuning is being prepared. IPAC paper deadlines are 20th April for SL and 30th April for GL.

K. Paraschou presents on commissioning simulations for PETRA IV using pySC. PETRA IV starts to be unstable from 1 um misalignments. K. Oide suggests to rather compare same lattices with same errors rather than just xsuite and AT lattices and pySC code. E. Musa comments she is using this code for W tuning. J. Keintzel suggests simulating commissoining of the FCC-ee for LCC V106.2 for high-beta star and/or ballistic optics - tbd. R. Tomas comments that coupling RDTs could also be used. Commissioning is foreseen 2032. S. Jagabathuni comments that phase correction is found better than LOCO for FCC.

S. Thakur presents on FCC-ee booster simulations. She presents optimized wigglers at Z energy with emittance and damping time as a trade-off. First results are very promising and focus on optimising the ideal lattice. A. Chance comments a new booster is almost ready to be released, Q. Burant et al will then use this for tuning simulations. 

G. Katsanevakis presents on tuning studies and the code framework for the LCC. Colleagues from EPFL have also started using it. 

K. Andre presents news on the LCC tuning studies for the ttbar lattice. b2, and a2 errors are now included in the arc dipoles. M.A Jebramcik confirms that he performs DA and MA studies at SCENTER not at the injection point. H and V orbit correctors are in quadrupoles, normal quadrupole correctors are in quadrupoles. Preliminary studies show the need of 100 mT for NQ and 50 mT NS.  Following discussion with A. Vorozhtsov comments that designs on magnets are already starting. It is agreed in about 2 weeks new LCC studies are foreseen aiming for H in dipoles, V in sextupoles, NQ in quadrupoles and SQ in sextupoles. Regarding the low MA, M.A Jebramcik suggests to increasing the RF voltage. 

Following a question by R. Tomas, K. Andre reports that even for ideal tapering also leads to 10 um orbit, beta-beating below 1%.K. Oide suggests to put constraints on the orbit of the final doublet. 

For emittance tracking, particles are lost leading to spikes in the rms. K. Oide suggests looking at a Gaussin fit emittance instead.

I. Garcia presents the timeline for the magnet prototypes. 02 April 2026 is defined as deadline to fix the orbit and linear optics correctors layout.  

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