MICE Collaboration Meeting at Frascati, Jun 26~29, 2005

PID Support Design

Stephanie Yang

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 3

The existing support provision for the PID equipment

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 6

Cherenkov Connection details at the PID seating locations

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 9

Support channels bolted to the TOF 2 outer frame

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 11

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.