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S Yang, 26-Jun-2005 2
Why a common support structure for the PID equipments:
There is very little space along the beam line direction for the accommodation of the PID equipments;
As a result, they need to be packed quite closely to each other. These “lollipop” looks like are unstable and unsafe to work with;
It was agreed that the TOF2, the Cherenkov 2 and the EmCalorimeter are to be mounted on a common support structure.
The common support maximises the space utilisation and provides a reliable and safe working environment
S Yang, 26-Jun-2005 4
Iron Shield suspended off the tracker solenoid cryostat
The revised PID support structure
TOF 2
Cherenkov 2
EMCalorimeter
PID support can slide in and out of normal anchor position in both X & Z directions
X
Y
Z
S Yang, 26-Jun-2005 5Elevation view of the support
structureEnd view of the support structure
The PID support Structure
S Yang, 26-Jun-2005 7Support details at the Cherenkov 2
Support is via two 125 x 125 x 10 C-Channels bolted on existing Cherenkov outer frame Shim pack to
adjust the final height
S Yang, 26-Jun-2005 8Support arrangement for the TOF2
Seating plate is via a 10mm thick plate welded to the end
of the C-channel
TOF support legs: 50 x 50 x 4mm thick C-channel
S Yang, 26-Jun-2005 10
CKOV2 drawing received from Ghislain in Feb,2005 TOF2 drawing
received from Maurizio in Feb, 2005
S Yang, 26-Jun-2005 12
Similar support arrangement for the EMCalorimeter
EmC drawing received from Ludovico on 15th Jun,2005.
S Yang, 26-Jun-2005 13
How strong is this structure?
The structure is made up of a series of C-channel and L - beams;
The main load bearing beams are 75 x 75 mm wide with 6 mm thick;
The heaviest component (the Cherenkov) weighs about 1 to 1.5 tonnes and sits on the mid span of the main support beam.
A quick calculation, using twice the load and a conservative support condition (load at mid-span) showed an acceptable stress (131 MPa compared with an allowable of over 240 MPa) and deflection of 0.4mm;
S Yang, 26-Jun-2005 14
What next?
The design was done based on support being able to move in and out of the normal operation position by rail. Features associating with this will be worked out once the railing design is complete
There may be access requirements that we are not aware of;
We now need to go through the design with the PID group leaders to see if there is any particular need they wish to see on the structure;
We believe the design is fit for its purpose.