Tungstar© slug and support


    The slug ( yellow part of the picture) is the main part of the calorimeter : It is the very part placed through the beam line, so that we can determine the energy of the beam using the formulae seen in the operating principes page.
The slug is made of Tungstar©, a material made of  95% tungsten and 5% copper, in order to obtain a very high thermal conductivity, and to minimise the formation and the loss of hadronic and electromagnetic particules (and showers).
This material is the best to meet those requirements and in accordance with the size required for the slug (length 6.30" and 6.299" in diameter), but involves another big problem that's we don't know the heat capacity of such a material with the accuracy needed. See the calibration and the operating principes pages for more

    This slug is in the vacuum chamber, attached to a 3 position system that enables it to move from through the beam to out of the beam, either in the equilibrium position or in contact with a cooling system.

    You can notice the ceramic pins (5) in each screw(6) that enable to avoid heat loss by heat transfert from the slug to its support.




1 : slug
2 : claw
3 : coupling block
4 : oversized beam line support
5 : ceramic pin
6 : screw
7 : nut


    
















detail of the connection to the feedthru  (and the 3 position system).