LHC MD15464 shift

Author: Yannis Angelis

docs/logbook/LHC/2025_lhc.md

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 | 2025-06-22 15:40 | 2025-06-22 20:40 |     0.5H     |    MD14963    |                   MO detuning                    |                                  [Shift Start](logbook://2025-06-22,1081,4322659) / [Summary](logbook://2025-06-22,1081,4322924)                                   |
 | 2025-06-28 08:30 | 2025-06-28 12:00 |     0.3H     | Commissioning |                RDT vs phase knob                 |      [Shift Start](logbook://2025-06-28,1081,4327972) / [Summary](logbook://2025-06-28,1081,4328352) ([OP][op_rdt_vs_phase_knob]{.cern_login target=_blank})       |
 | 2025-06-28 12:00 | 2025-06-29 05:00 |   0.5H 1HN   | Commissioning |                 OO Commissioning                 |       [Shift Start](logbook://2025-06-28,1081,4328097) / [Summary](logbook://2025-06-29,1081,4328684) ([OP][op_oo_commissioning]{.cern_login target=_blank})       |
+| 2025-09-04 23:00 | 2025-09-05 07:30 |     1WN      |    MD15464    |    Refining optics corrections at top energy     |                         [Shift Start](logbook://2025-09-04,1081,4380286) / [OP Summary][op_md_refining_optics]{.cern_login target=_blank}                          |
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 [op_rematched_ir7]: https://be-op-logbook.web.cern.ch/elogbook-server/GET/showEventInLogbook/4322475
 [op_rdt_vs_phase_knob]: https://be-op-logbook.web.cern.ch/elogbook-server/GET/showEventInLogbook/4328444
 [op_oo_commissioning]: https://be-op-logbook.web.cern.ch/elogbook-server/GET/showEventInLogbook/4328594
+[op_md_refining_optics]: https://be-op-logbook.web.cern.ch/elogbook-server/GET/showEventInLogbook/4380521
 
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@@ -80,4 +82,5 @@ The tables below can be sorted by clicking next to the column headers.
 *[MO detuning]: Measurements of amplitude detuning with several settings of the MO, as input to Massimo/Dora's cleaning MD.
 *[RDT vs phase knob]: Checked MO RDTs response to phase knob at injection for pp optics, seem to observe improvements with a stronger setting of the phase knob. Difficult measurements due to high losses on kicks.
 *[OO Commissioning]: Measured optics in the OO cycle, with PbPb corrections. Optics in ramp were ok, with a match point showing a peak of 17%. At FT the beta-beat and dispersion show a similar quality to that of ions in 2024 and of the 2025 PbPb optics at 1.2m, but large dispersion error on left side of IP6. With PbPb corrections through the squeeze optics are fairly consistent but we see a peak beta-beating of 17% at EoS. SbS hints at large local errors in the IRs at this lower energy. The beta-star-beating at IR2 was very bad at EoS, especially B1. Computed and tested some global corrections which were beneficial to beta-beating, dispersion and beta-star, would need waist knobs to do better. To be decided if these are to be used for the OO run.
+*[Refining optics corrections at top energy]: Started with off-momentum measurements at injection up to 200Hz, without tune feedback. ADT kicks with large amplitude. End of squeeze, kmod at 160 and 120 crossing angle and testing of two waist knobs. RDT vs crossing angle scan of IP1. Issue with Beam1 BPM concentrator.
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