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34th WP8 Bi-weekly meeting (2016-04) [Follow-up of modifications at Point 8, layout]

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530/R-030 - BE-EA Conference Room (CERN)

530/R-030 - BE-EA Conference Room

CERN

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Description
Follow-up of modifications at Point 8. Implications for lay-out, TCDDM and mini-TAXN. implications for LS2 activities.
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Attendance: C. Adorisio (HSE-RP), V. Baglin (TE-VSC), C. Boccard (BE-BI), F. Cerutti (EN-STI), I. Efthymiopoulos (BE-ABP), j.L. Grenard (EN-HE), M. Lazzaroni (EN-EA), R. Lindner (PH-LBO), H. Mainaud Durand (EN-ACE), F. Sanchez Galan (EN-EA), p. Santos Diaz (TE-VSC), E. Thomas (PH-LBO), A. Tsinganis (EN-STI)

E. Thomas: LHCb interest is clear for an upgrade which would bring luminosity to 2.10^34 . From the 2 options, the outcome of the workshop was to focus on option 1: No displacement of IP, keep same spectrometer.

R. De Maria: We assume that TAS is decoupled from the TAN study. At present, TCDDM for D1 is the bottleneck for the aperture. Studies need to continue about the best optics configuration that will not limit LHCb performance

F. Cerutti: The protection currently foreseen is ok until LS3, Further studies should be done based on new optics, but extrapolating the present LS2 layout (Mask+ mini-TAN) yo 2.10^34 the energy deposited on the cold mass is 60 W, while the peak is 10 mW/m^2 (roughly a factor 10 higher). A new protection system shall be foreseen afer LS4 upgrade, probably affecting the collimators as is the case for P1 & P5. 

V. Baglin asked what happens if we use a bigger Cu mask alone (no TAN). The power in D2 should be reevaluated. I. Efthymiopoulos pointed out that the exposition of collimators would increase, they could take a spray if crossing angle decreases. Flanges of vacuum connections could be affected too.

F. Sanchez Galan: Currently the integration of the D2 mask is a challenge, needs to be solved in the WP15 integration meetings coming next month. Baseline assumes that the mask is not shielded, which is the case until LS4. The constrains about pushing for a post-LS4 solution are likely much bigger that the potencial gains.

The general agreement is that LS2 activities should be decoupled from LS4 upgrade.

Reported by Francisco Sanchez Galan

 

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