LHCb underground cavern (lhcb-cb)
From: hans.Jurgen.Hilke@cern.ch
Date: 7/14/00
Time: 12:23:06 PM
Remote Name: 137.138.142.33
Remote User: lhcb
Comments
<PRE>
Dear Members of the CB,
to keep you informed early about a possibility, which is being
investigated at present, I send you a message, which has been
distributed to the TB Members last week. Once feedback is obtained on
the open technical questions and from the TB, the management will come
back to you with its proposition. If anyone of you is feeling strongly
about any particular point, please feel free to contact me already now.
Best regards,
Hans Juergen
Dear colleagues,
the CERN management is finalizing the contracts for scrapping LEP
material. LHCb has, therefore, been asked to confirm its list of DELPHI
components, which it wishes to keep. Since last year, the situation was
that LHCb would require less than half of the DELPHI barracks
underground for electronic racks and gas distribution. When last week
going through with Jorgen Christiansen and Beat Jost our latest numbers
on electronic racks , which are supposed to be placed into the
accessible zone behind the concrete wall , we realized that less than
one quarter of the DELPHI barrack space would be occupied. Any of three
scenarios (keeping only A+C or B or D) would give us more that a factor
of 2 spare room for any later additions.
Being under continuous pressure to do our maximum to promote public
awareness for the CERN activities, the idea came up of possibly finding
room for preserving the DELPHI Barrel as an exhibition piece in the area
next to the electronics’ barrack(s), on the side of the exit from the
personnel elevator PZ. In a crash program, Daniel Lacarrère, Rolf
Lindner, Christian Joram (who is responsible for the dismantling of
DELPHI ), Jean Renaud (responsible for the DELPHI pit) and myself have
gone through implications of various layouts. We reached the conclusion,
that a reasonable layout is possible even for keeping barrackD, which
would give the largest ‘spare room’. With respect to the present
dismantling scheme for DELPHI some savings in cost and time could be
expected. There is no disturbance foreseen of the installation of LHCb.
The inconvenience due to the space taken up by the yoke should be small.
First discussions with TIS indicate, that ‘scientific’ visitors could be
allowed any time and the public at least during large fractions of the
years up to mid-2005 and during long shutdowns afterwards. It is clear
that even this somewhat restricted scenario would already be of great
interest to CERN and also to LHCb. In fact, the LHCb pit would become a
major attraction already during the years before our installation, with
the possibility to describe in ‘the real environment’ the recent past
and the future in an impressive way. It has been clearly stated by us,
that this idea is not supposed to interfere in any way with projects to
keep or to reassemble the ALEPH detector, which are under discussion
since quite some time.
To see, whether it was sensible at all to pursue the idea any further, I
asked in writing the DELPHI spokesman Tiziano Camporesi, if DELPHI would
support the idea. Although approval from the DELPHI Collaboration is
still pending, the first reactions are very encouraging. Because of the
imminent signing of the contracts to scrap LEP material, I was asked to
inform right away also the CERN management, making clear though that
further discussions inside LHCb were still required before any decision
could be taken. Again the first reactions, in particular from Hans
Hoffmann are very supportive.
We, should, therefore, try to get a clear picture inside LHCb as rapidly
as possible. I suggest the following steps.
1. Daniel Lacarrère will investigate in more detail the consequences on
the layout and installation.
2. He will together with Rolf Lindner and Christian Joram update
drawings of the proposed layout on the Web (LHCb Subsystems/
Experimental Area/LHCb Counting house).
3. With your help, Jorgen Christiansen will update once more the
requirements for rack space in the underground barrack(s).
4. Rolf Lindner will summarize the likely needs for the distribution of
the gas systems.
5. You are requested to send me already by e-mail any objections,
questions or comments you may have, also supportive ones, please.
6. This issue will be discussed in our next TB July 28th. I hope that we
will be able to clarify all the technical points, thus allowing the
managemnt to finalize its position and make a proposal to the
Collaboration.
Best regards,
Hans Juergen
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