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Review of Ballistic optics
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Europe/Zurich
Warm MQSX and Ballistic optics
16/3/2022 short LNO meeting focusing on the Review of Ballistic Optics
News, Rogelio, all :
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The CERN management + council follows up on suspending collaborations with Russia.
Student requests will be sent this morning.
Tobias reports from the operations side that the LHC magnet training goes as expected. The startup with beam is scheduled for the 11 April. If things go really well this could be advanced to maybe the 8th of April. Only half of the LHCb velo is installed. The other half should be installed later, as will also be discussed in todays LMC meeting.
Ewen says that optics studies in the injectors are continued, also including K-modulation.
Helmut reports that Roderik presented ideas in the last LBS meeting https://indico.cern.ch/event/1132918/ to use the regular loss map studies in the startup for parasitic background studies with data taking by ATLAS and CMS.
Jacqueline will soon defend her thesis in a public presentation. The link to this will be distributed.
Review of Ballistic optics, Leon, slides
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Leon presented an update of the ballistic optics preparations for RUN3 as follow up of this presentation in the last meeting, concentrating mainly on providing answers to questions raised.
The exact value of the top energy for the ballistic optics run is not critical. 6.8 TeV is not required. A lower energy like ~ 6.5 TeV is sufficient, such that the injection optics can be used throughout. The dispersion in IR4 (of Dx approximately -0.5 m) is within tolerances allowed by RF. Leon showed the phase advances between the transverse MKD kicker and the TCT collimators. They differ more from the optimal values than in standard physics. This will reduce the protection provided by the TCT collimators for the triplet, but should not be a major problem since the triplet regions are not an aperture bottleneck as visible in the plots shown. In addition, the ballistic run will be limited to pilot intensities.
Roderik asked which parameters were used for the aperture plots : HL-LHC parameters and 1 mum normalized emittance.
Leon agrees to redo the aperture checks using the nominal 3.5 mum normalized emittance used by collimation.
Details of collimation and machine protection remain to be checked. They could also profit from experience in the successful ballistic run performed in LHC RUN2. It appears that the details of the earlier run are not easily accessible and it was suggested that the forthcoming ballistic run should be documented like machine studies by an MD note.
The significant tune correction required for the ballistic run will introduce some beta beating. Rogelio comments that the optics could be quickly (~1h) measured and if needed be corrected.
The next LNO meeting is planned in two weeks
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