Construction status

1
Construction status
2
Doublet-layer production -- 1

• Light yield of bulk scintillator has been checked
  and found to be OK
• Scintillating fibres are made from the bulk
  scintillator
• One end of 350 mm scintillating fibres are
  cut/polished then aluminum is sputtered to
  reflect signal to read-out end
• Reflectivity of mirrored end is monitoredMean R
  75 RMS4

3
Doublet-layer production -- 2

• Then fibres are laid-out on a mold with groove
  pitch of 426 mm1491 fibres per doublet-layer
• 40 of 50 doublet-layers completedproduction
  rate is one layer per day

4
Station assembly --Bundling

• To reduce the cost of the read-out electronics
  seven 350 µm fibres are read out through single
  clear-fibre light-guide with diameter of 1.05 mm
• Then bundling is needed, where seven
  consecutive fibres are bundled with a rubber
  tube, then bundles are laid out in a tool called
  comb
• Number of fibres in each bundle is checked

5
Station assembly --Connectorisation

• A 22 way optical connector mates seven
  scintillating fibres with one clear fibre
  waveguidealignment of connector holes at
  scintillating fibres and clear fibres sides are
  checked with go/no-go gauge
• The scintillating fibre bundles are threaded
  through one of 22 holes of optical connector
• Number of fibres in each bundle and order of
  fibres/bundles are checked

6
Station assembly --Gluing

• Three doublet-layers are glued onto a
  carbon-fibre station frame with 120 degrees
  radial spacing
• Optical connectors are attached to carbon-fibre
  station frame
• Scintillating fibres are potted to optical
  connectors
• polish fibres with diamond fly cutter

7
Station 5

• Production and quality assurance procedures
  proved to work

8
Waveguides production

• Attenuation length of samples from all clear
  fibre production batch have been measuredMean
  8.4 m, Sigma 0.5m
• The first waveguide is under production

Assembly scheme
9
Cryostats DAQ

• Cryostats production
• All parts in house
• Work continues to complete the first production
  cryostat
• DAQ
• Firmware is begin developed for AFE-IIt / VME
  LVDS Serdes Buffer (VLSB) to cope with MICE
  environment
• Zero suppression scheme
• Read-out scheme via VLSB
• Synchronisation with ISIS beam
• Distribution of trigger signal under
  consideration

10
3D model

• 3D model of the interface region of the tracker
  is being built at Imperial to check
• Cable run
• Diffuser mechanism

11
Summary

• Doublet layer production already started
• 50 doublet layer will be completed this month
• Station production starts this month
• Two views per week (at full speed)
• Waveguides production and QA procedure is being
  checked
• Two weeks per station (conservative estimate)