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A Critical Test For The CMA Composite Mirror…

A Critical Test For The CMA Composite Mirror…. Questions:. LHCb claimed that the CMA mirror did not pass the C 4 F 10 gas test. Some questions have been raised: What is the design of the mirror that was sent to LHCb?

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A Critical Test For The CMA Composite Mirror…

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  1. A Critical Test For The CMA Composite Mirror… • Questions: • LHCb claimed that the CMA mirror did not pass the C4F10 gas test. Some questions have been raised: • What is the design of the mirror that was sent to LHCb? • Have the mirror been subject to higher temperature to accelerate the aging process? • Will the answer be different for C4F8O? • LHCb received a mirror that does not have a core reinforcement. • A note from LHCb report changes in mean radius of about 4% in the first 20 days (But this note describes two different mirrors). Chaouki Boulahouache

  2. CMA Mirror (1)… • The composite mirror is fabricated as a sandwich structure, where the two constituent materials are: a matrix (binder) and a core reinforcement. • The matrix is cyanate ester polymer matrix (EX-1515) from Bryte Technologies • The core reinforcement is made of CFRP (Continuous Fiber Reinforcement Plastic) which is produced from Torray M46J fibers (63msi tensile modulus and near zero CTE). • We have received a mirror prototype from CMA, it has a square shape (29cmX29cm) with a thickness of 2.5cm. The radius of curvature is 350cm Chaouki Boulahouache

  3. CMA Mirror (2)… • One question that was raised is the print through problem ?! • Our CMA contact is aware of that problem, he attributed it to two things: • Mandrel • Process (amount of glue, mass requirement,…) • The reason why the print through is more apparent in the good mirror rather than the bad mirror is that they tried to reduce the print through that was shown in the bad mirror, thus they made it worse. But they are going through different iterations to optimize the process. Chaouki Boulahouache

  4. Mirror in prison… • Mirror exposed to C4F8O • The atmospheric pressure, temperature and the static pressure of the gas in the box are monitored. The mirror is attached by three mirror mounts to mimic the final configuration Chaouki Boulahouache

  5. Spot-size And Mean Radius Measurements… • The test set up to measure the spot size have been modified to increase the numerical aperture of the light source so that we can illuminate the whole mirror. I’ve added a microscope objective with N.A. = 0.65. Chaouki Boulahouache

  6. Reflectivity measurement (1)… Rotating mirrors • Measurement • Reference The mirror Rotating mirrors Measurement Laser Laser Movable mirror Diaphragms Reference Movable mirror Rotating mirrors Rotating mirrors Chaouki Boulahouache

  7. Reflectivity measurement (2)… Mercury lamp and monochromater Laser Chaouki Boulahouache

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