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Optical readout concept for a large LAr TPC: Status at Warwick

Optical readout concept for a large LAr TPC: Status at Warwick. N. McConkey , Y. Ramachers. Why optical readout for LAr TPC?. Information retrieval. MWPC. LAr Volume. Double-Phase. Optical readout. Minimise cost by number of readout channels and simplicity of design.

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Optical readout concept for a large LAr TPC: Status at Warwick

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  1. Optical readout concept for a large LAr TPC: Status at Warwick N. McConkey, Y. Ramachers Y. Ramachers, Durham 11/03/2011

  2. Why optical readout for LAr TPC? Information retrieval MWPC LAr Volume Double-Phase Optical readout Minimise cost by number of readout channels and simplicity of design Y. Ramachers, Durham 11/03/2011

  3. We know it works in principle P.K. Lightfoot et al., JINST 4 (2009) P04002 Y. Ramachers, Durham 11/03/2011

  4. What’s left to do?Experiment focus at Warwick Check VUV versus Infrared argon light Model of Electroluminescence observation Baseline optical readout scheme Sparse array CCD readout Y. Ramachers, Durham 11/03/2011

  5. Electroluminescence simulation in liquid argon Photon emission mean free path Cross section e-Ar scattering Drift velocity: Measured to Monte-Carlo [MV / mm] !!! Suggests that sharp edges play a role D.Y. Stewart et al., JINST 5 (2010) P10005 Y. Ramachers, Durham 11/03/2011

  6. Baseline schemes:Sparse array readout Light sensor array Imaging plane Y. Ramachers, Durham 11/03/2011

  7. Sparse array readout Now can get array design parameter Usually get THIS New algorithm avoids pin-cushion distortion! Publication is work in progress 1mm resolution Y. Ramachers, Durham 11/03/2011

  8. CCD readout scheme Most attractive – ‘single’ readout channel Challenge: Speed of camera Y. Ramachers, Durham 11/03/2011

  9. CCD readout scheme Speed challenge? Not really! Optical readout isn’t exactly new! First: P. Fonte et al, NIMA 283 (1989) 658 and latest M. Gai et al., JINST 5 (2010) 12004 Used for Gaseous Detectors Y. Ramachers, Durham 11/03/2011

  10. CCD readout in Gas M. Gai et al., JINST 5 (2010) 12004 Y. Ramachers, Durham 11/03/2011

  11. CCD readout in Gas Suggests: Can image slowly – get arrival from fast charge signal in LAr Check! Y. Ramachers, Durham 11/03/2011

  12. Summary • After Proof-of-principle lot’s of work still do be done • Check on baseline optical readout methods • Sparse array shows most progress to date • CCD readout shows promise for the future • Electroluminescence model created, needs checking • VUV versus Infrared in liquid needs testing in Laboratory • First imaging of tracks still missing Y. Ramachers, Durham 11/03/2011

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