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Click here for comments and suggestions.
Figure 1
The upper half of this figure shows the angular positions of the SPD services in the SPD cone at RB24
(for the original file by A.Pepato see here ).
The lower half shows the angular positions of the SPD services in the SPD cone at RB26; they will
be the same as for the RB24 side (the shadowed-green rectangles are a copy of the service channels defined
for the RB24 SPD cone). For the original file by A.Pepato see
here ,
here and
here .
Minor note.
The SPD cone at RB24 is installed at the end of the SPD installation. It has the only
purposes of sustaining the SPD services and of providing fixations for the supports of the optical
connectors (see fig. 2). That is: the SPD cone at RB24 has no structural functions as support
of the SPD barrel.
Figure 2
The upper part shows the position of the supports of the fiber connectors in the
R-z plane at both RB24 (left side) and RB26 (right side). On the top-right corner
the front part of the SPD patch panel is also shown (see also fig.5).
The green rectangles represent the SPD services at RB24 when, during the
ITS installation, they lay horizontally in order to allow the sliding of
the SDD+SSD barrels to the nominal position at the interaction point.
The lower part of the figure shows a pictorial view of supports of the fiber connectors
together with the SPD patch panels for the RB26 side
(from slide #9 of this file )
These supports have the same shape and size at both RB24 and RB26 (see Fig.3).
They are integral with (or will be fixed to) the SPD cones and are located at
the same radial position on both cones.
In order to avoid dangerous crossing of the SPD fibers with the services of the other
sub-detectors, these supports will have the same angular positions as the SPD patch
panels (A.Pepato).
Minor notes
From slide #3 of this file (by S.Maridor),
it seems that (to be confirmed by E.Rosso / C. Gregory) :
a) the thickness of V0 is now 45 mm,
b) the clearance between the V0 and the Front-Absorber is now 6 mm.
However, the sum a+b is equal to that shown in this figure.
(for the original file see here ).
Figure 3
It shows the dimensions of the supports of the optical connectors for both the RB24 and the RB26 sides.
The length (along Z axis) of 85 mm grants a clearance of 9 mm with respect to V0 (see fig. 2).
The overall height (in the radial direction) is 36 mm and the overall width is 182.4 mm. For the
original file see here .
The size of these supports will likely have to be modified because
in the present positions they overlap each other and because some of them overlap with the
spokes at 45° of the third cone (see fig. 4).
Figure 4
It shows the present angular positions of the SPD patch panels at RB26 (from slides #1 and #3 of
this file , by P.Barberis).
The shadowed-pink ring, copied from fig. 1, represents the face of the SPD cone towards the absorber
(and the patch panels). The shadowed-green rectangles, copied from fig.1, represent the service channels
in the SPD cone. The shadowed-blue ring and spokes represent the third cone.
The dot-dashed circles represent the inner (348 mm) and outer (384 mm) quotes of the supports
of the optical connectors, as given in fig. 2 for the RB24 side, and valid for the RB26 side
too (A.Pepato). The shadowed-yellow rectangles represent the supports of the optical connectors.
The front faces (towards ITS) of the patch panels have Z= -1020 mm (according
to this EDMS document , approved by the TB on Jan.27, 2003).
The size of the front face of the SPD patch panel is now 100 x 72 mmm2
(accordingly to the request made at the ALICE week of March/04).
The following three points are acceptable by SPD (A.Pepato) :
- The size of 100 x 72 mmm2 is consistent with the needs
of the "non-fiber" section of the SPD patch panel (see fig. 5).
This size will be considered as an envelope size .
- The volumes labelled "A" in this figure, that lay below each SPD patch panel, are not needed
by the SPDs (air ducts included). The volumes labelled "B" are not used by the SPDs only at
the level of the patch panel; instead they are occupied by SPD services between the patch
panels and the TPC end-plate (Z < -1370 mm).
- At RB26 only , the "fiber" section of the SPD patch panels can extend up to a radius of
590 mm when the fibers are rolled-up. Once the fibers are unrolled and connected to the
optical connectors of the SPD cones, the envelope of the SPD patch panels will not exceed the
radius of 580 mm.
In order to avoid dangerous crossing of the SPD fibers with the services of the other sub-detectors, the supports of the optical connectors (see Fig.3) must have the same angular positions as the SPD patch panels (A.Pepato). These supports are shown in this picture, using their overall width of 184.2 mm. NOTE: a small overlap seems to exist between them (being checked by A.Pepato).
NOTES
The FMD patch panels have been exchanged with a pair of SPD patch panels in order to
have a better facing of each service channel in the SPD cones with its patch panel.
In this way the routing of the SPD services from the channels in the SPD
cones up to the supports of the optical connectors and from there up to the patch
panels seems well feasible.
The size of the supports of the optical connectors will likely have to be modified because
in the present positions they overlap each other and because some of them overlap with the
spokes at 45° of the third cone.
Figure 5
It shows the details of the SPD patch panel (original file here ).
The following points have to be confirmed by A.Pepato:
- the quote H1, corresponding to the "non-fiber" section of the patch panel, should be ≤72 mm;
- the quotes H2 and H3, corresponding to the rolled-up fibers, is unknown;
The lower part of the figure shows a pictorial view of the SPD patch panels and summarizes the connection sequence (from slide #9 of this file ). It should be valid for the RB24 side too.
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