Present at the meeting;
B. Cure, K. Elsener, A. Gaddi, L. Gatignon, H. Gerwig, A. Sailer
Summary Notes:
Konrad gave a short introduction to the meeting, reminding everyone of the post-CDR work on a CLIC detector concept and of the - temporarily? - much reduced list of "a priori" assumptions.
The main topic of the meeting was the possible reduction of iron in the CLIC_SiD yoke, work done primarily by B. Cure. A shorter version of his presention will be shown at the CLICdp meeting (detector optimisation session) on 10 June.
The main conclusion are that:
-> reducing the half length of CLIC_SiD from 6.2 m to 5 m is feasible
-> in terms of magnetic field homogeneity and stray field, the iron remove from the endcap yoke can be replaced to a good approximation by a set of "end-coils"
-> the design parameters of these "end-coils" are realistic, when compared to the LHCb dipole magnet coils
In an exploratory study, Benoit found that the iron in the endcap yoke could be reduced further, but the end-coils would then have to become superconducting ones. The iron in the barrel yoke can be reduced by a substantial amount without any compensatory measures, the strayfield increases only by a rather small amount in this case.
In the discussion, Andrea Gaddi stressed that for future detector optimisation discussions one should consider models without 90degree corners in the path of the cables/services. To be studied by looking e.g. at CMS.
AFTER THE MEETING: Konrad added the slides from a talk by Suzanne van Dam (CERN techn. student) who investigated different types of materials in the support tube of the LumiCal/BeamCal. The study was done for CLIC_ILD, and the aim was to improve the shielding of the HCAL endcap against secondaries from the high rate of incoherent pairs hitting mostly the region around the BeamCal.
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