Special meeting on the results of the cold tests of MBHA-001 - Update 9

Europe/Zurich

Participants (23):

Frederic Savary (Meeting Organizer)

Franco Julio Mangiarotti (Accepted in Outlook)

Gerard Willering

Arnaud Devred (Accepted in Outlook)

Luca Bottura (Accepted in Outlook)

Marta Bajko (Accepted in Outlook)

Herve Prin (Accepted in Outlook)

Emmanuele Ravaioli (Accepted in Outlook)

Arjan Verweij (Accepted in Outlook)

Bernardo Bordini

Felix Rodriguez Mateos (Accepted in Outlook)

Jens Steckert

Mateusz Jakub Bednarek (Accepted in Outlook)

Tiago Daniel Catalao Rolhas Da Rosa (Accepted in Outlook)

Jaromir Ludwin (Accepted in Outlook)

Michal Duda (Accepted in Outlook)

Salvador Ferradas Troitino (Accepted in Outlook)

Arnaud Pascal Foussat

Samer Yammine (Accepted in Outlook)

Michele Martino

Lucio Fiscarelli

Marco Buzio (Accepted in Outlook)

Dario Baffari (Accepted in Outlook)

Action items:

Item

Action

Who

  • Prepare a summary of all test data accumulated until now.

DONE, reported on 2020-03-27

Franco

Gerard

  • Extend analyses to other signals (e.g., from splices, busbars, and diode).

TO DO

Franco

  • Magnetisation effects from components other than the coil and splices.

TO DO

Bernardo

Frédéric

Hervé

  • Like for the intermittent short, perform an analytic study of the magnet circuit for an intermittent inductive coupling.
  • Find anything that could explain the signals observed.
  • We may call this flux jumps taxonomy.

TO DO

Emmanuele

  • Characterize the different types of flux jumps observed in N3Sn magnets (of course, 11T in particular), during ramp up (nominal 10 A/s, …), ramp down, linked to dI/dt reaction from PC, and like those observed now.

TO DO

Gerard

  • Characterize quench propagation to splices.

TO DO

Bernardo

Dario

Emmanuele

Gerard

  • Wavelets.
  • Wavelets should be done on other signals and other magnets, to see where the anomalies are situated.

ONGOING, Lucio to call 
a specific meeting

Lucio

Marco

  • Mechanical movements and vibrations (M4 line and lyras).

TO DO

Hervé

  • Identify changes between the two type A magnets, LMBHA001 and LMBHA002. On the side of the electrical circuit (geometry of the leads/splices/bb, …) and on the side of the other components and materials (check material certificates, batches, also yoke laminations Magnetil vs ARMCO, welds on iron, …).

TO DO

Frédéric

Hervé

  • More insight of the power convertor, and its possible impact.

TO DO

Michele

Samer

  • Study impedance to dI/dt dependence to currents other than 9 kA.

ONGOING

Jaromir

Mateusz

  • Carry out transfer function measurements at different frequencies, and higher current (when tests at cold are resumed).

TO DO

Jaromir

Mateusz

  • Study to add an additional voltage-to-ground  (around 1 kV) during a quench.

TO DO

Franco

Gerard

Samer

 

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