First demonstration of 3D optical readout of a TPC using a single photon sensitive Timepix3 based camera

• The ARIADNE project is developing innovative optical readout technologies for two-phase liquid Argon time projection chambers (LArTPCs). Optical readout presents an exciting alternative to the current paradigm of charge readout. Optical readout is simple, scalable and cost effective. This paper presents first demonstration of 3D optical readout of TPC, using CF4 gas as a proof of principle. Both cosmic rays and an Americium-241 alpha source have been imaged in 100 mbar CF4. A single-photon sensitive camera was developed by combining a Timepix3 (TPX3) based camera with an image intensifier. When a pixel of TPX3 is hit, a packet containing all information about the hit is produced. This packet contains the x,y coordinates of the pixel, time of arrival (ToA) and time over threshold (ToT) information. The z position of the hit in the TPC is determined by combining drift velocity with ToA information. 3D event reconstruction is performed by combining the pixel's x,y location with this calculated z position. Calorimetry is performed using time over threshold, a measure of the intensity of the hit. © 2019 IOP Publishing Ltd and Sissa Medialab.

Ämnesord

NATURVETENSKAP  -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)

Nyckelord

Cameras

Cosmology

Cost effectiveness

Liquefied gases

Photons

Pixels

Two phase flow

Drift velocities

Event reconstruction

Optical readout

Proof of principles

Time of arrival (TOA)

Time over thresholds

Time projection chambers

Two-phase liquid

Particle beams

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