Scintillating fibre tracker

First SHiP Workshop

Zurich, 12 June, 2014

Vladimir SHEVCHENKO, on behalf of Kurchatov Institute SciFi group,

Moscow, Russia

Warm up: a comment (SciFi–unrelated)

12 June 2014 SciFi Tracker First SHiP Workshop, Zurich 2

Suggested solutions to hierarchy problem:

Version 3. Something is wrong with the states (SUSY etc)

Version 2. Something is wrong with the current (composite Higgs etc)

Version 1. There is a symmetry which keeps

Sensitivity to the physics above UV cutoff

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For quantum field theory defined on a lattice with link a :

Actual physical dynamics IS fine tuned:

Lattice here can be seen as a «detector», a measuring devicewhich brings its own storyto the theory.

We know from experiment in all these cases that 1/a terms are irrelevant.

Not (yet) deep enough understanding of quantum field theory?

New Scintillating Fibre Tracker for LHCb

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LHCb Scintillating Fibre Tracker layout-I

(slide from Fred Blanc)

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Layout-II

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Scintillating Fibre Tracker SiPM readout

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(slide from Fred Blanc)

SiPM Photo-Detection Efficiency

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(slide from Fred Blanc)

Cladding and transmission mechanism Kuraray SCSF-78MJ scintillating fiber is double cladding

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Attenuation length in 250 µm Kuraray fibre

Latt. in cm:

The recent order of 100 km (8 spools) from Kuraray SCSF-78MJ scintillating fibres showed Latt values around 3.2m

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(slide from C. Joram)

SciFi Tracker in numbers

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(slide from Fred Blanc)

Sci-Fibre tracker for SHIP neutrino detectorStereo layers of the fibre-ribbon walls readout by SiPM

ECC mini-walls Fibre Tracker

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(picture from G. De Lellis)

SciFi spatial resolution (≤100 µm) is more than sufficient to predict τ-neutrino vertex.No problems with radiation hardness, SiPM cooling, overall positioning etc.

2 steps:• Fibre rewinding from a large Kuraray cardboard (Ø 1000 mm) drum to a smaller (Ø300 mm) plastic one, fibre quality control during rewinding.

• Winding process allows production of 5(6)-layer fibre ribbon using the EpoTec epoxy glue impregnated with TiO2 bonding

SciFi ribbon fabrication method

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Drum from Kuraray

Measurement of fiber diameterand light leak

Data base for traceability

Cleaning (dust)

Drum ready for production

Tension control

Similar setup is running at Dortmund TU.

Fibre quality control (RWTH, Aachen)

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(picture by B.Leverington)

Winding process:

Fibers are placed in grooves on drum

by precise CNC winding machine.

Pitch of grooves on drum: 275 μm.

Fiber cut after each layer.

Then, fibres are placed in the grooves

between the fibres of the bottom layers.

Tension increased (20100 g) for each

next layer.

5(6) layers wound on top of each other.

SciFi ribbons production (RWTH, Aachen)

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Winding hub production at IPT

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(pictures by Th.Kirn)

New SciFi ribbon winding wheel (matrix)

Stainless steel precise threaded wheel Ø 822 mm on aluminum hub.

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LHCb SciFi Tracker production schedule

The SciFi project schedule calls for the R&D phase to be completed by the middle of the 2015 followed by the production phase which should end by the middle of 2017. The fibre and the carrier panel procurement will start by September 2014. With an average production rate of 1 fibre ribbon per day at least two full rate production facilities are needed to comply with the project schedule. One of them is being built at NRC Kurchatov Institute.

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Production clean room at NRC KI , Moscow

240 m2 area clean room, 10.000-100.000 class, being constructed

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Production clean room floor plan

Work zones:

I – ribbon winding zone,II – fibre quality control,III – cutting and assembly, IV,V – CR entrance zone,VI – module storage area.

Equipment lay-out:

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Conclusions for SHiP

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• The main «propaganda picture» is very nice. There could be something behind it.

• SciFi tracking technology is very nice. We should develop it for LHCb upgrade and use all its advantages in full for the SHiP project.

• Perhaps it is (or will be in some time) worth thinking about focused satelite-based project complementary to SHiP (Space SHiP ?). SciFi is well suited for that (reliability, small mass, low power dissipation etc).

SciFi Tracker First SHiP Workshop, Zurich