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How were the diodes tested prior to installation

How were the diodes tested prior to installation. A. Siemko TE-MPE. Endurance tests of diode stacks. All diode assemblies, prior to their installation in magnets were tested at cold condition Each set was submitted to 10 test cycles at ultimate current with strict acceptance criteria.

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How were the diodes tested prior to installation

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  1. How were the diodes tested prior to installation A. Siemko TE-MPE

  2. Endurance tests of diode stacks • All diode assemblies, prior to their installation in magnets were tested at cold condition • Each set was submitted to 10 test cycles at ultimate current with strict acceptance criteria

  3. Diode tests in magnet assemblies • Diodes installed in the first batch of ~200 dipoles were not tested at cold • these diodes were dismantled and reinstalled following dedicated procedure, including electrical qualification of the so-called half-moon joints • All other diodes were cold tested during series tests of magnets in SM18. • “transient bump” method was developed to test the diodes and resistance of their joints and connections to the busbars

  4. “Transient bump” method

  5. “Transient bump” method (zoom)

  6. Example of the test results

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