The NA61 TPCs (1) Overview: Mechanics readout Position resolution

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Presentation transcript:

The NA61 TPCs (1) Overview: Mechanics readout Position resolution principle Mechanics readout Position resolution Particle identification Calibration

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Working principle of a TPC Voltage divider Field cage R High voltage electrode (negative) Driftgas Magnetic Field (measure particle momentum) Electric field (elctron drift) Multiwire proportional chamber (0V) Rainer Renfordt, IKF The NA61 TPCs

Signal generation in a multiwire proportional chamber with pad readout 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Signals of one pad after digitization and zero suppression (NA49 online monitor) Drift time of electron cloud Amplitude (ADC counts) 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs The gating grid prevents positive ions from drifting back into drift volume: space charge distortions prevents electrons from entering the amplification region: ageing Garfield calculation of field lines 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs The gating grid Different way of presentation: drift lines of electrons/ions Garfield calculation for OROC chambers of ALICE (no field wires → larger signals on pads) 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Gating grid pulser Principle of operation: Badly tuned pulser causes noise in the first couple of time bins ONE THING TO BE CHECKED BY SHIFT CREWS! 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Ageing effects 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Construction of the VTPCs This design allows very light construction: multiple scattering is minimized 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs VTPC: looking along the beam direction field cage is split in two halfs, the beam area is outside the field cage 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs MTPC field cage 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Inside the MTPC 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs MTPC chambers are first inserted through the opening,then pulled back sealing with O-ring Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs VTPC chambers are inserted from top and sealed with RTV (silicone) Chamber body Support frame (end plate) 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs TPC readout 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs From Zoltan: 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs From Andras: 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs motherboard Concentrator board 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Digitized signal of one pad (with zero suppression) 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Resolution issues: position resolution Important for momentum (vector) determination: curvature in magnetic field emission angle 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Position resolution (pad direction) as fu of drift length (MTPC) Diff & gas gain fluct & pad size & electr. Noise & threshold measurement Diffusion & gas gain fluct 2 x Diffusion Diffusion only 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Optimization of pad angles: track angle relative to beam direction at center of VTPC2 π- from Lambda P from Lambda Angle (rad) All neg tracks All pos tracks Final pad angle RMS X (pad direction [cm] 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Effect of track angle L projection δx ~ L*σ *tanα/√Neff Neff ~ 12/cm (not 40) centroid 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Position resolution as function of track angle Sectors 4 - 6 Sectors 1 - 3 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs Effect of Lorentz angle at wire on cluster width and resolution asymmetric relative to beam direction, i.e. Positive and negatice particles 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs

Rainer Renfordt, IKF The NA61 TPCs to be continued 20.04.2018 Rainer Renfordt, IKF The NA61 TPCs