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GSI-CERN Collaboration for MM systems

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Carlo Petrone is inviting you to a scheduled Zoom meeting. Topic: Carlo Petrone's Personal Meeting Room Join Zoom Meeting https://cern.zoom.us/j/3840972342?pwd=cXBOeExURFV3ZXR2Q1pxNXVLa2MzUT09 Meeting ID: 384 097 2342 Passcode: 588027 --- One tap mobile +33170372246,,3840972342# France +33170379729,,3840972342# France --- Join by SIP 3840972342@188.185.44.109 • 3840972342@188.185.46.179 Passcode: 588027 Join instructions https://cern.zoom.us/meetings/3840972342/invitations?signature=KPgYqtVA4ymCeXy11jmrFfoSySa4Av2xHGIqBZHBjpc
Carlo Petrone (CERN)
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https://cern.zoom.us/j/3840972342?pwd=cXBOeExURFV3ZXR2Q1pxNXVLa2MzUT09



Meeting ID: 384 097 2342
Passcode: 588027

CERN-BOX: https://cernbox.cern.ch/files/spaces/eos/project/m/magnetic-measurements/02_MM_CAMPAIGNS/External_Collaborations/GSI?items-per-page=100&files-spaces-generic-view-mode=resource-table&tiles-size=2

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Meeting Notes

  • Status of Quadrupole Magnet Measurements
    • Measurements are proceeding smoothly; no rack/system operational errors observed.
    • Two quadrupole magnets have been measured; repeatability checks are planned.
    • A polarity issue was found; reversed input/output labels led to powering the magnet in reverse, yielding a negative instead of a positive quadrupole.
    • The team stressed strict polarity checks and correct coil connections for quadrupole measurements.
    • Crane operator unavailability at GSI delays further measurements until 2026-06-29.
      • Conclusion: Current setup is functional; enforce the polarity procedure. Data collection resumes once the crane is available.

 

  • Onboard vs. Post-Processing Data Analysis
    • Onboard FFMM analysis uses two FDIs (main and compensated) and omits the third FDI.
    • Raw data includes all three FDIs; full offline analysis will extract complete harmonics.
    • Kn file consistency is required; remove or share extra Kn files on the PC to ensure consistency.
    • Online Kn settings serve fast feedback only; final results will rely on post-processing with the selected Kn files.
      • Conclusion: Proceed with post-processing using consistent Kn files; onboard outputs are indicative only.

 

  • Python Post-Processing Workflow and Outputs
    • A slightly modified CERN Python script will be shared to analyze LDM datasets for quadrupoles.
    • Steps:
      • Use a KN file with the third column as the third FDI.
      • Input coil resistance (from patch panel measurement) to correct for voltage divider effects.
      • Apply measured level meter offsets (connection and non-connection sides).
      • Analyze raw files to generate Excel outputs with main field, angle, level meter, bn, an, and displacement.
      • Aggregate positions into a final Excel template, including coil length, reference radius, positions, current, and field.

 

  • Data Sharing and Collaboration Setup
    • An Indico page will host procedures, files, and references.
    • A CERNBox folder will store live datasets and documents; write access will be granted to relevant members.
    • GitLab may be used for code later; initially, CERNBox is sufficient.
      • Conclusion: Centralized sharing via CERNBox/Indico agreed; access was provided during the meeting.
  • Scheduling and Availability
    • Daryl will be on vacation next week, returning on 2026-07-06 at CERN to focus on stretched wire tasks and metrology materials.
      • Conclusion: A short follow-up meeting is planned after initial processing; the broader measurement campaign resumes after 2026-06-29.
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