Jörg Wotschack CERN o n behalf of the MAMMA Collaboration The 2 x 1 m 2 MM milestone Parameters Chamber dimensions 1 x 24 m 2 overall 092 x 212 m 2 active area 2 x 2048 strips 045 mm pitch separated in the middle ID: 646462
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Slide1
Status of 2 x1 m2 MMmilestone
Jörg
Wotschack
(CERN)
o
n behalf of the MAMMA CollaborationSlide2
The 2 x 1 m2 MM (milestone)
Parameters:
Chamber dimensions 1 x 2.4 m
2 (overall, 0.92 x 2.12 m2 active area)2 x 2048 strips (0.45 mm pitch), separated in the middle Flatness of readout plane to better than 50 µm over full areaConstruction:Follow the scheme used for the 1 x 1 m2 chamberFour 0.5 x 1.2 m2 PCBs (thickness 0.5 mm) glued to stiffening panelPCB boards for 1st chamber have been made at CERNResistive strips have been printed (in industry), with interconnectsFloating mesh, integrated into drift-electrode panelMechanics (panels, glueing, …) in PH/DT-EM2
NSW meeting, 10/12/2012
J. Wotschack (CERN)
2Slide3
1 x 1 m2
sketch (not to scale)
NSW meeting, 10/12/2012
J. Wotschack (CERN)
3
Stiffening panel
Drift electrode
Pillars (128 µm)
PCB1
PCB2
Stiffening panelSlide4
1 x 1 m2
sketch (closed)
Stiffening panel
Rohacell
NSW meeting, 10/12/2012
J. Wotschack (CERN)
4
5.00
PCB1
PCB2Slide5
Construction drawing
NSW meeting, 10/12/2012
J. Wotschack (CERN)
5Slide6
Status as of today
Drift-electrode PCBs were produced at CERN
-
readyReadout PCBs (1.2 x 0.6 m2) PCBs were made at CERN - doneResistive strips were printed in industry, good quality but not perfectPillars will be deposited at CERN – starting tomorrowFinishing (cutting, cleaning, etc…) at CERNStiffening panels, drift (15 mm) and readout (10 mm):glued last week at CERN on a marble (no vacuum) – drilling of holes (for the bolts) todayGlueing of drift-electrodes and readout boards this week (using vacuum)Mesh glueing on drift-panel scheduled for next Monday (17 Dec.)Assembly in the week of 17 Dec.NSW meeting, 10/12/2012
J. Wotschack (CERN)
6Slide7
Resistive strips on readout panels NSW meeting, 10/12/2012
J. Wotschack (CERN)
7Slide8
The making of the drift panelNSW meeting, 10/12/2012
J. Wotschack (CERN)
8Slide9
Panel measurements
Panels are locally stiff, but not over full surface
D
eformations (100–200 µm) induced by friction when positioning itSurface is smooth; small imperfection (100 µm) because of glue excessNSW meeting, 10/12/2012J. Wotschack (CERN)9(15 mm)Slide10
Conclusion
The work on
the
2 x 1 m2 milestone chamber is going ahead, the chamber will be ready before the end of the yearTesting (in the lab) beginning of January 2013A second chamber is planned for early 2013 NSW meeting, 10/12/2012J. Wotschack (CERN)10