Introduction (taken from [1])

The FASER tracker consists of three stations, each of them composed of three planes with eight SCT modules per plane. Each station is linked to a central backbone supported by the first and second magnet cylinders via clamps (Fig. 1).


Each tracker plane consists of a CNC-machined aluminum frame of size ∼ (320 mm 320 mm 32 mm) with an integrated cooling circuit, an inlet for dry-air flush and all required openings for the flexes and pins to fix the silicon modules on the frame (Fig. 2).

Within a station, the inter-plane alignment is done via two high-precision pins located in 5 mm-diameter H7 holes while the fixation between two planes is done via four M5 screws. Each plane will be equipped with a rubber joint to ensure a good sealing. A 500 μm-thick aluminum shim will be placed in between planes in contact with the joints.

The nomenclature for stations, planes, and modules is described in [1].


History of development

  Characteristics / modification from previous version Comment # of manufactured flexible cable

Global design, including Patch Panel fixation interfaces

1 hole per corner for targets (metrology)

SCT modules with aluminum pins included in the CNC machining

Water cooling channel at 6mm ID

Interchangeable frames, stack-able 1

SCT clamps are slightly modified, adding on pin to avoid rotation while screwing into the frame

New interfaces / Patch Panel fixation (and detailed design for its supporting frame).

New holes for targets within the active area (to get "access" to silicon targets on the opposite side, as much as possible)

New depth on some pockets to increase the gap between wire bonds and the frame.

Frame size is the same as v1

A complete metrology will be carried out on this version

Frame size slightly changed (same raw material), to accommodate with SCT modules shift (5mm)
SCT modules are closer along strip axis, modifying the patch panel position (flexes are unchanged)
Patch Panel frame multi positioning to accommodate with this 5mm shift, plane to plane

Reduced ID for water cooling channel (down to 5mm ID, avoiding this channel to be too close to the flex groove)

Aluminum pins are replaced by pins in PEEK

Frames are no longer inter changeable 9+3

List of planes

  Characteristics: modules and frame History Name
Plane 1

modules for Tunnel plane, layer 1 station 3

frame v2

in B161 and first tests ok, more testing foreseen Plane1
Prototype Plane

modules for prototype

frame v2

in B161 under test, foreseen for ENH1 setup commissioning,

cosmic setup, magnet test


in readout Plane100

Plane 2

modules for Tunnel plane layer 2, station 3

frame v2

for metrology at UniGE TBD
Plane 3

modules for Tunnel plane layer 3, station 3

frame v2

frame in metrology at UniGE TBD
Plane 4

modules for Tunnel plane layer X, station X

frame v3 (final frame)



CERN-Search-Service, faser-all

-- HidetoshiOtono - 2020-05-05

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