Analysis of Beam Commissioning and Tune Evolution in 2015
This study analyzes the tune variation during beam commissioning in 2015 at the Large Hadron Collider. It includes comparisons of beam fills, bare tune analysis, evolution, and differences between beams 1 and 2. The research delves into the behavior of tune parameters, energy models, and the accuracy of the system. Various fills in 2015 are discussed, highlighting peculiar behaviors and offsets. The findings provide insights into the performance and adjustments needed for optimal beam operation.
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Beam commissioning 2015 Bare tune analysis Mariusz Juchno Mariusz Juchno 1 09.09.2024
Introduction Analysis of the tune variation during beam commissioning 2015 Previous work: N. Aquilina et al. Tune Variation in the Large Hadron Collider Estimation of the bare machine tune base on measured tune and MQTF/D currents Nest step: Analysis of the tune decay after injection Multiple time constants First two terms of the decay law Mariusz Juchno 2 09.09.2024
Side by side comparison of 2011 and 2015 fills Fill 2105 (2011) B1 / B2 intensity: 1.9e+14 / 1.9e+14 p Fill 3621 (2015) B1 / B2 intensity: 9.9e+09 / 1.0e+10 p Mariusz Juchno 3 09.09.2024
Bare tune from MQT F/D currents Fill 2105 (2011) Fill 3621 (2015) Mariusz Juchno 4 09.09.2024
Bare tune evolution Fill 3621 (2015) Both beams (B1 in particular) have higher QH than pre-LS1 fills QV at injection around levels from 2012 (B1&B2 switched values) Strange QH drift of the B1 between 3 and 6.5 TeV Fill 2105 (2011) Operation in 2011 showed higher QV at injection Mariusz Juchno 5 09.09.2024
Tune vs energy and model accuracy Fill 3621 (2015) Injection (450 GeV) 17 units Flat top (6.5 TeV) 8 units Fill 2105 (2011) Injection (450 GeV) 15 units Flat top (3.5 TeV) 6 units Mariusz Juchno 6 09.09.2024
H and V bare tune difference between beam 1 and beam 2 Fill 3621 (2015) QV behaviour for B1 and B2 is similar QH for B1 shows a linear drift during the ramp (feed-down from the sextupole misalignement?) Fill 2105 (2011) Both QH and QV behave in a similar way for B1 and B2 but with an offset Mariusz Juchno 7 09.09.2024
Other 2015 fills Fill 3622 (2015) Diagonal offset? Fill 3632 (2015) Mariusz Juchno 8 09.09.2024
Conclusions Post-LS1 bare tune different than during previous runs Higher QH, relation between B1 and B2 tunes different than before, drift of the B1 QH Saturation seems to be modeled very well Overall accuracy of magnetic model similar as before Injection 17 units, flat-top at 6.5 TeV 8 units Analysis is ongoing Next step: tune decay Mariusz Juchno 9 09.09.2024
