CERN 7-11-5 adb

Chamber Support Structure Installation

MUON SYSTEM INTEGRATION MEETING

- Status of Production of support panels- Things to be settled prior to installation- Plans for the Installation of the support panels

2 m

2,4 cm

1,5 m M2 prototype at LNF transport & positioning

M2 proto

precision pin

glue

rivets

assembly steps

M2 proto

3 panels 4 panels

M2 proto

photogrammetry (50 m) in horizontal position of the holes for rivets (our main reference; much better than our needs 0,5 mm)

M5 real

Accuracy of Industrial photogrammetry

Accuracy of Cospal’s industrial photogrammetry = 1/120.000(certified by GSI)

8 microns per 1,0 meter of object size

Conditions: Photographs: from at least 2 different heights and from varied geometry.

Coded targets: 8 or more (we use 14 coded targets).

Scale bars: 2 or more (we use 2 scale bars).

Observations: each point seen at least 6 times.

Plan quality factor: between 1.00 and 2.00.

Image space RMS: < 0.3 micron

Scale bar agreement: better than 0.05 mm

Point RMS: better than 0.035 mm in each direction.

slide from COSPAL

Accuracy of Industrial photogrammetry

The measurement was performed on a 3D-measuring machine, type PM 302010, brand Leitz, at MAN Technologie AG in Ausburg (Germany). This type of measuring machine scans the surface mechanically whit a tip. The machine is installed in an air-conditioned room on a concrete plate which is supported by air bearings for vibration insulation. The measuring error is about 6 micron (absolute).

For having a comparison reference on the measurements we have carried out through the photogrammetry system, we have measured one panel using a different measuring system having a better accuracy.

Cospal’s photogrammetry Rms 54,5 micron

MAN 3D-Measuring machine (DEA) Rms 54,2 micronslide from COSPAL

delivery of two half-stations (PS & UZ) at the same time: long term stockage (3 - 4 months)

M5 real

M5 ready before end November; then two half-stations every two weeks (delivery completed at end of January)

lifting tools

prototype design

fixation joints

activities before installation

• SC document under preparation by Alessandro summarizing the calculations done to ensure that the walls and their assembling are adequate for our purpose: panels, connections, fixation joints, chamber supports final lifting system design (structural analysis) resistance verification of lifting system

• material procurement (all orders sent before middle December)

• PPSPS under preparation by Alessandro to finalize procedures for a safe assembling in the area

• transport to the pit of materials and installation tools (January) + working spaces organization

- panels arrival at Bld 156/similar spaces

- lifting tools installation in the pit

- panels transport to the pit

installation sequence

1 panel in vertical position

2 chamber supports fixation

3 grounding copper braid fixation

4 cable supports

5 panel lifting

6 positioning of the following panel

7 gluing & riveting

8 safety electrical soldering (metallic structure)

9 alignment check of some chamber supports (with ruler)

next

day

(gl

ue h

arde

ning

)

less than one working day for each panel: one half-station a week

2

3

4

installation plan for the supporting structure

Start cryo side (US) middle January (12/1/6)

• 2 weeks for the first half-station M5 (16/1-29/1)

• 1 week for the first M4 half-station (30/1-5/2)

• 1 week for the first M3 half-station (6/2-12/2)

• 1 week for the first M2 half-station (13/2-19/2)

Switch to pit (PZ) side on March

• 4 weeks for M5-M2 (20/2-19/3)

M1 immediately after