Some Ideas for Cooling Layer00

As currently proposed, 2/3 of the heat at Layer00 is radiated from SVXII. Therefore, we have considered the possibility of using the carbon fiber sleeve as a thermal shield. This reduces the number of cooling pipes which are required close to the beam pipe, thus removing scattering material at small radii as well as simplifying the mechanical construction.

We believe that 2 small diameter cooling tubes, fixed opposite to each other and running the whole length on the inside of the carbon fiber sleeve, would be sufficient to provide an effective thermal shielding.

To perform the ANSYS simulation, we have modelled half the carbon fiber sleeve at r=20.25mm, placing Layer O at r=24mm with a temperature of +15C. We assume a thermal conductivity of 200 W/(m K) for the carbon fibre and used 0.025 W/(m K) for the air gap. We have cooled the carbon fiber sleeve over its whole length on an area of 1mm^2 at the point of symmetry (ie intersection of the axis with the half cylinder). The figure below shows that the shield is capable of being maintained at -10C, which means that two pipes are sufficient to remove the heat comming from Layer O.

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