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Demonstrator Meeting
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Europe/Zurich
30/6-019 (CERN)
- Mechanics:
- Only SS is considered for mechanical components (Al introduces too much pre-stress during the cool-down)
- Glyn says that we have measured contraction coefficient for HTS tapes
- 3 steps of simulation: bolt pretension, cool-down, powering
- Jumps modelling à effectiveness is measured on displacements (knife movements)
- If we pin, we have more stress concentration, but not to dangerous à depends on the assembly procedure
- Impregnation à friction coefficient. Has been measured? Maybe Christian Shoerlien got something
- Pole: with pole lower mean, higher peak. Interesting to check the detach and the pressure on the coils
- Jumps: 2 pairs of jumps analysed. Local stress are induced to Lorentz forces. Configuration v2 seems much better and v1. We should check bonded model and check the contacts and check compression/tension on several point on the contact surface. We should avoid spaces where the tape/spacers can move. Filler, maybe g10 can be used
- Sensitivity study: thermal contraction has a strong impact on the stresses à experimental measurement of CTE for impregnated stack
- How to put the external belt. It will be difficult to use a single piece. On CLAS torus they used bladder between external coil and external ring. We need few tenths of mm as gap to put filler (STD101G with glass fiber).
- Impregnation à
- Luca found papers that state that the crack of the resin bring a crack on the tape. We need to avoid crack in the resin and separate tapes from the resin
- Design of the mold started and check if we can do mechanical test with it
- Winding machine à progressing. Actually ready 3 spools ready at 100%. Labview interface ready, but calibration is still required.
- Raw material à buy material after iteration with Nicolas. Finalizing the mechanics with Jerome, checking the drawings with Diego and Tuukka.
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