1. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 1 The main events in the installation sequence of the RICH1 Gas Enclosure are explained.  The difficulties with the installation  Advance preparations required underground  Installation operations  Summary With thanks to all the design engineers who provided the drawings, especially Rohan and Trevor RICH1 Gas Enclosure Installation

2. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 2 The Objective. The objective is to insert the gas enclosure into the shielding.  There is a nominal 10mm clearance with the shielding iron at both the vertical and horizontal surfaces.  The Gas Enclosure (GE) frame weighs about 700Kg  The shielding will be already aligned on the beam-line.  The one tonne crane is available but operates above the shielding.  The GE cannot be lifted using the thin window frames

3. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 3 The solution adopted. An installation beam will be inserted below the upper shield.  The installation beam will be supported from above  A special lifting beam will be fitted inside the GE.  The GE will be initially lifted onto the beam outside the shielding and aligned with the shielding.  Insertion is done using a push travel trolley on the installation beam.  Stabilisers will prevent excessive movement during insertion.  Mounts allowing final position adjustment are fitted.

4. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 4 GE transportation and lifting Lifting and transportation tooling has been provided..  Lugs bolted to the GE allow a crane to lift and/or rotate it.  A special trolley permits movement when no crane is available.  The GE and trolley are not designed to be lifted as a unit (But perhaps this is still possible?)  The GE is normally transported lying flat on the entrance window.

5. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 5 The sequence of operations 1 Operations on the cavern floor, prior to installation  All the blanking panels have been removed to allow access inside.  Install the lifting beam  Install the guide rollers (optional at this time). They may interfere with the lifting slings

6. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 6 The sequence of operations 2 Placement of the installation beam  Bolt the guide plates to the iron  Place the short upper beam (36Kg) in position (using the 1- tonne crane?)  Put the installation beam (85Kg) in position using the 1-tonne crane, the beam clamp and a counter- weight.  Fit connection rods.  Install the push travel trolley and hoist.  Install the downstream GE mounts into the iron shielding. The beam is suspended from crane using the beam clamp. A counterweight of 20Kg is used to keep the beam horizontal Counterweight Beam Clamp 203x102x23mm Universal Beam

7. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 7 The sequence of operations 3 Displacement to the platform using the cavern crane  Place the trolley on the platform  Lift the GE and place it directly on the trolley  (Or lift GE and trolley together directly from the cavern floor)  Remove the lifting lugs Translation to the installation point.  The trolley with the GE can be wheeled to the installation point under the beam  Attach the lifting beam, guide rollers (if not already done) and the beam clamp. Raise the GE on the hoist.  Attach the hoist, lift and adjust for balance by moving the clamp if necessary.  Adjust the guide rollers. Insert!

8. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 8

9. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 9 The sequence of operations 4 Fitting and adjusting the mounts.  The downstream mounts are already in position and need only be screwed up as necessary.  The upstream mounts must be fitted and height shims inserted.  Remove all the installation equipment.  A survey will then be performed.  Position adjustments to be made as required.

10. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 10 Summary A sequence of operations has been described which we believe is both safe and permits the installation of the gas enclosure in a controlled manner. Engineering calculations of all the critical components indicate that they are operating with large safety margins.

11. RICH1 Gas Enclosure Installation. Experimental Area Meeting at CERN on 21st June 2006 Bill Cameron (Imperial College London) on behalf of the RICH1 team. 11