= SmartPhantom meeting: Wednesday 5^th^ June 2019, 16:00 = == Meeting details == Teleconference Phone details: {{{ UK: 08082 380274 Austria: 0800 006612 PIN: 5904750902 }}} Full list of telephone contacts may be found [raw-attachment:Z0-Phone-details.pdf here]. == Notes: == **Present:** JB, KL, AK, HT, LC 1. Outline of design: LC \\ Present design for gluing jig was described (see [raw-attachment:190529-SmartPhantom.pdf slides]). * Questions raised: * What resin should be used? We discussed trade-off between viscosity and fibre spacing. Need to take advice from Resin Lab. * How to will a doublet layer be wound? Concept is that former is used to wind one layer of fibres. Fibres themselves for the support for the second layer. * What is the minimum bending radius of the fibre and does the lobe match the minium bend radius for the fibre? We discussed the issue of micro-cracks, which may degrade optical performance, and the possibility of fibre breaking. We agreed that we would need to address the fibre-breaking issue to avoid a lot of wasted time and material during manufacture. * **AK** agreed to find minimum bending radius; * **LC** will consider options for stopping the unravelling during manufacture. * We discussed how to move forward and **//agreed//** to move to prototype manufacture when: * LC had a chance to think about a means of mitigating issues arising from fibre breaks; * Input had been received from the Resin Lab about the various gluing issues; * Samples of printed circuit board (**JB** to supply spec) and carbon-fibre sheet have been sourced; * Further we **agreed**: * To place an order for clear fibre (**KKL, AK**) * To consider optical readout next time. 1. Slide from HT:\\ HT presented outline results of his simulation (see [raw-attachment:p207_simulation_stack_nomylar_V.png slide]). Initial conclusions: * Mylar OK if thickness is less than 300 microns per sheet * We also agreed to consider aluminium or black (anodised) aluminium * The use of (e.g.) 50 micron aluminium will be checked in simulation (**HT**). 3. **Agreed** to meet next week: * 11:00 Tuesday 11Jun19