High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors
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1 High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors Wilco Koppert Nikhef, Amsterdam Detector R&D January 18, 2012 Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 1 / 14
2 Concept: TPC Gaseous Time Projection Chambers: Charged particles ionise the gas Electrons drift to electrode (X,Y) Drift time drift velocity gives (Z) Fit through all (X,Y,Z) reconstructs track segment Usually: huge (meters) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 2 / 14
3 Concept: TPC Gaseous Time Projection Chambers: Charged particles ionise the gas Electrons drift to electrode (X,Y) Drift time drift velocity gives (Z) Fit through all (X,Y,Z) reconstructs track segment Usually: huge (meters) in the past! GridPix detectors can be 1000 times smaller! Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 2 / 14
4 Concept: GridPix TPC Driftgap is meters-millimeters TimePix chip, pixels 55 µm pitch pixel: 10 ns time resolution The crucial part: the grid Electrons drift through the grid In between the grid and the chip the field is large (100 kv/cm) Multiplication takes place, signal is measured by pixel measures individual electrons! Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 3 / 14
5 GridPix Right: SEM picture from the chip with a grid some example measurements: Sr-90 decay in B field (right), π-cathode interaction (left) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 4 / 14
6 My Work: GridPix Performance Studies Analysis: resolution, efficiency Tested :3 GridPixes (1 mm gas layer) in the SPS accelerator at CERN, tilted 45 Analysis is ongoing; some results are shown in the next slides Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 5 / 14
7 Track Position Resolution Track Position Resolution is function of: ionisation number 5 mm 1 electron diffusion mm mm clock cycle drift velocity 0.01 mm timewalk drift velocity 0.13 mm pixel pitch mm } gas property } chip property diffusion and drift velocity; function of the Electric field. timewalk; function of the charge on pixel Resolutions can be adjusted by: -chip specs (see next talk, F. Zappon) -gas choice: CO 2 /DME (50:50) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 6 / 14
8 Track Position Resolution Position Resolution for a GridPix (1 mm gas layer) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 7 / 14
9 Track Position Resolution Position Resolution for a GridPix (1 mm gas layer) Simulated resolution agrees with measurements Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 7 / 14
10 Track Efficiency The number of ionisations is poisson distributed The probability of 0 electrons is the inefficiency From below the detection efficiency is estimated >98% Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 8 / 14
11 Conclusion and Outlook Conclusion: The position resolution agrees with simulations The efficiency is as expected from simulations Outlook: The DAQ readout frequency is improved by factor 30 New beam tests are planned for this spring A laser setup is being finished to investigate gas properties A step to mass production is taken (8 wafers) because of high demands Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 9 / 14
12 Concept Characteristics Conclusion and Outlook Ongoing Studies Ongoing Studies GridPix is being investigated for usage in dual phase dark matter experiments (right); see poster P07.13 (Rolf Scho n) GridPix in proton therapy (bottom); data KVI Groningen, analysis ongoing. Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 10 / 14
13 Acknowledgements Nikhef: M. Fransen, H. van der Graaf, F. Hartjes, N. Hessey, J. Visser, P. Tsopelas, B. Huisman, R.Schön Bonn University: Y. Bilevych KVI Groningen Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 11 / 14
14 Backup Slides (discharges) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 12 / 14
15 Backup Slides (timewalk) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 13 / 14
16 Backup Slides (gas) Wilco Koppert (Nikhef) High Precision Measurements of Track-segments of Ionising Particles with GridPix Detectors 14 / 14
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