DELPHI - LHCb Exposition Project
LHCb has realized recently that the number of required electronics and gas racks could probably fit in one or maximum two barrack towers, .e.g. D1,D2,D3 or B1-B4. Hans-Jürgen Hilke pointed out that the space occupation of LHCb's barracks in the refurbished UX85 cavern would therefore not be incompatible with the possibility of maintaining a stripped down version of DELPHI in place. This means that point 8 could in principle house both a running LHC experiment and an almost complete LEP experiment in its original cavern!
Public visits can be envisaged during a substantial fraction of the period 2001 - 2005, when the cavern undergoes certain transformations (civil engineering work) and the LHCb experiment is going to be installed. After the LHC start-up public visits can be arranged at least during the yearly shut down periods of 4-5 months which happen to be times of highest demands. The capacity of this CERN attraction in terms of visitors per year would be comparable to a current LEP experiment.
The LHCb collaboration came now (11 Aug 2000) to the conclusion that the barrel part of the DELPHI detector can be kept in the cavern without disturbing the installation and operation of the LHCb experiment. On 28 September 2000 the CERN directorate has approved the exposition project.
The base line option is shown here: top view , side view. It foresees to preserve the barrel without endcaps. Most of the outher muon chambers would be shaved off to reduce the total diameter of the barrel. DELPHI would be placed together with the barracks D1 and D2 behind the 3 m thick radition protection wall. A module of barrack A and B would be placed on top of D2 to create additional spare rack space. The barrack A tower (which is still shown in the drawings) would then not be needed anymore and could be removed. Gas and cooling platforms would be installed on an intermediate level left and right of the counting barracks.