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MSE thermal birefringence and shot to shot reproducibility

MSE thermal birefringence and shot to shot reproducibility . Motivation: MSE has poor reproducibility in q measurements Last campaign we determined this was caused by birefringence in L2 from temperature changes throughout the run day (1080523) Bench experiments support this hypothesis.

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MSE thermal birefringence and shot to shot reproducibility

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  1. MSE thermal birefringence and shot to shot reproducibility • Motivation: • MSE has poor reproducibility in q measurements • Last campaign we determined this was caused by birefringence in L2 from temperature changes throughout the run day (1080523) • Bench experiments support this hypothesis

  2. Thermal Management MSE thermal shield L2 mount O-ring seat • Actions taken • New L2 mount to thermally isolate lens from the MSE canister • New heat shield for temperature control of entire canister • Proposal • A few identical shots throughout a run day to check reproducibility • Preferably run days with significant RF heating for worst possible thermal environment

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