Floating MD results

Thursday 21 Jul 2022, 09:30 → 12:10 Europe/Zurich

Remote meeting (zoom)

Giovanni Iadarola (CERN), Jan Uythoven (CERN), Matteo Solfaroli Camillocci (CERN)

09:30 → 09:40 Introduction

09:40 → 09:55 MD#6863: Amplitude Detuning Corrections from Feed-Down

[10' presentation + 5' discussion]

Speakers: Ewen Hamish Maclean (CERN), Joschua Werner Dilly (Humboldt University of Berlin (DE))

pres_22_07_21_lswg_md6863.pdf

Notes:

• Main objectives of MD achieved
• Not urgent to deploy these corrections in operation, but could be done at some point

 

09:55 → 10:10 MD#6944: Voltage calibration with beam

[10' presentation + 5' discussion]

Speaker: Helga Timko (CERN)

LHC_RFMD_FMD_2022.pdf

Notes:

• Main objectives of MD achieved
• Measured voltage calibration could be folded in the operational settings

10:10 → 10:25 MD#6949: Validation of bunch-by-bunch detectors functionality

[10' presentation + 5' discussion]

Speakers: Eva Calvo (CERN), Sara Morales Vigo (University of Liverpool (GB))

20220721_MD_6949_first_report.pdf

20220721_MD_6949_first_report.pptx

Notes:

• Main objectives of MD achieved
• Need a second session to test improvements on the firmware and other functionalities
• Potentially very useful tool, interest from other MD users

10:25 → 10:45 MD#6807 & MD#6803

• MD#6807: Slow vs fast octupole scans in nominal conditions
• MD#6803: BTF for Chromaticity Measurements

[15' presentation + 5' discussion]

Speaker: Lorenzo Giacomel (CERN)

instabilities_floating_MDs.pdf

Notes:

• Main objectives of MDs achieved
• BTF studies to be continued with tests at high energy
• Octupoles stability threshold seems lower compared to Run 2, to be investigated

10:45 → 11:05 MD#6843 & MD#6924

• MD#6843: Methods for non-linear optics correction at small action
• MD#6924: Slow beam degradation from incoherent electron cloud effects - preparation

[15' presentation + 5' discussion]

Speakers: Ewen Hamish Maclean (CERN), Konstantinos Paraschou (CERN)

20210721_LSWG_MD6924.pdf

2022-07-21_LSWG_FMD1-results.pdf

Notes

• Focused on 3Qy resonance characterization and correction
  • Could achieve very good correction
• Low-action studies to be finalized in a future session (few hours on one beam at injection)
  • Could be combined with other optics studies at injection that will be requested for the future

11:05 → 11:20 MD#6823: UPS noise and ADT

Speakers: Guido Sterbini (CERN), Sofia Kostoglou (CERN)

LSWG_MD6823_results.pdf

LSWG_MD6823_results.pptx

Notes:

• Could not observe the 8kHz cluster with low intensity at injection
• Still changes in the spectrum could be identified when modifying the UPS configuration
• Proposal: MD in the next block, or End-Of-Fill test
  • Risks to be assessed with rMPP

11:20 → 11:40 MD#7008: Validation of method to measure aperture margin between IR6 and TCTs with non-nominal phase advance

Speaker: Cedric Hernalsteens (CERN)

md7008-3.pdf

md7008-3.pptx