MEG Drift chambers
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MEG Drift chambers. Hardware Foils Hood Inner cathode Prints and preamps Calibration Malte‘s Garfield isochronal Lines and drift time calibration Calibration of cathode to anode ratio‘s,.... 2004. New foil sample (.25 m m Al) , ~ 5 x 5 cm good quality 36 kCHF for 40 foils

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MEG Drift chambers

  • Hardware

    • Foils

    • Hood

    • Inner cathode

    • Prints and preamps

  • Calibration

    • Malte‘s Garfield isochronal Lines and drift time calibration

    • Calibration of cathode to anode ratio‘s,....

  • 2004

MEG Drift chambers


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  • New foil sample (.25 mm Al) , ~ 5 x 5 cm

    • good quality

    • 36 kCHF for 40 foils

    •  final design

      • Shape of the frame

      • Deformation by mechanical pre-tension

        • Precise measurements (.1 mm)

        • Flexibility in the procedure to digest differences between old and new foil

MEG Drift chambers


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Tension of the foil must give the same torque as the forces used to pre-tension the frame : minimal final displacements

  • Measurements and simulations (FSE)

  • number of „pre-tension“ points

  • optimal frame shape

Inner cathode frame

Constant during manipulation

New tool to ‚transport‘ the frame, groove with O-ring around the edge to pump

MEG Drift chambers


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hood frame

MEG Drift chambers


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MEG Drift chambers



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x 1.10 x 1.05 x 1.00

Wire 1

Wire 2

Plan 1 Plan 4

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Calibration : x 1.00Only ratio‘s are important,right-left,anodes-cathode

Norm_cath1= (x1 + y1*sin(a))*(1 + p1*sin(a) ) (1)

Norm_cath2= (x2 - y2*sin(a))*(1 + p2*sin(a)) (2)

Norm_cath3= (x3 + y3*cos(a))*(1 + p3*cos(a)) (3)

Norm_cath4= (x4 - y4*cos(a) )*(1 + p4*(cos(a)) (4)

p1,p2,p3,p4 correction for the trackside

For each event and each wire:

Si : sin(a) from equation i Ci : cos(a) from equation i

a1 = atan2(S1,C3) a2 = atan2(S2,C4) am = .5*(a1+ a2)

Minimize  Sevent(abs( S1-sin(am) ) + abs( S2-sin(am) ) +

abs( C3-cos(am) ) + abs( C4-cos(am) ) +Scath (abs(Norm_cathj-measj ))

MEG Drift chambers


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  • Procedure works with defined p1,p2,p3,p4

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Plan 1 2 3 4 x 1.00

a1

a2

wires

Selection and classification of events

Choose the correct combination of and with the

Maximum of cos(a1) + cos(a2)

MEG Drift chambers


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2004 x 1.00

  • Design of Prototyp

    • Optimise construction procedure and get all informations for foils and frames

  • access MC (Hajime) to look for alternative solutions

  • „final“ design

  • test run in summer

  • construction, assembling

MEG Drift chambers


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  • Non magnetic preamp and cable x 1.00

  • Anode print test chamber (1:1) {no cathode strip }

  • Print, non magnetic preamp

  • and cable , ...sampling chip

  • Mount cathodes

  • Wire positioning tool

MEG Drift chambers