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PADI for straw tube readout and diamonds for MIPs and for high precision tracking beam test – Jülich, Feb. 2015 Jerzy Pietraszko, Michael Träger, Mircea.

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Presentation on theme: "PADI for straw tube readout and diamonds for MIPs and for high precision tracking beam test – Jülich, Feb. 2015 Jerzy Pietraszko, Michael Träger, Mircea."— Presentation transcript:

1 PADI for straw tube readout and diamonds for MIPs and for high precision tracking
beam test – Jülich, Feb. 2015 Jerzy Pietraszko, Michael Träger, Mircea Ciobanu, Jochen Frühauf, Christian Schmidt, P. Koczon and Christian Wendisch for the CBM Collaboration J. Pietraszko, DPG, Darmstadt, March 2016

2 Straw tube operation principle
Measures a distance of the track anode wire Determine the drift time of electrons time measurement Shortest drift times of electrons from track to wire  precision Drift velocity depends on: pressure, gas mixture, HV, tube size .... Drift velocity can be experimentally measured (goal of this experiment) and also simulated Straw tube cross section J. Pietraszko, DPG, Darmstadt, March 2016

3 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Hardware 22 cm Straw tube detector CBM-MUCH prototype 6mm diameter, ~22cm length detector gas: Ar/CO2 (70/30) gas pressure: 1bar HV: 1800V AC coupling to PADI input: 400pF(straw), 2.2nF(PCB) Drift time: up to 40 ns V. Peshekhonov et al., ”Straw tube subsystem of the CBM muon detector”, Physics of Particles and Nuclei Letters, March 2012, Volume 9, Issue 2, pp PADI6 ASIC 4 channel per ASIC, differential inputs 8 channel on FEET-PADI6_Hda conversion gain: 35(17.5*)mV/fC voltage gain: 244 BW: 416MHz time constant in setup: ~20ns M. Ciobanu et al., ”PADI, an ultrafast Preamplifier - Discriminator ASIC for Time of Flight Measurements”, Nuclear Science, April 2014, IEEE Transactions ,Volume 61, Issue 2, pp J. Pietraszko, DPG, Darmstadt, March 2016

4 Aim of the test Can PADI6 ASIC be used for straw tube readout ?
Setup for test in Jülich (proton beam) CBM MUCH prototype 6mm diameter, ~22cm length AC coupling to PADI input: 400pF(straw), 2.2nF(PCB) and reference detector .... Reference detector requirements: Determione position of beam particle with resolution below 50 µm time resolution better 100 ps single particle mode for MIPs  scCVD diamond J. Pietraszko, DPG, Darmstadt, March 2016

5 Experimental setup – reference detector
Reference, tracking, scCVD detector scCVD diamond signal for MIPs 100 µm 4.3 mm 4.3 mm four channels – metallization 100µm space between electrodes time resolution below 100 ps GeV Used threshold: 7mV on each channel  position better than 50µm  ≈ 90 ps J. Pietraszko, DPG, Darmstadt, March 2016

6 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Experimental setup Reference, tracking, scCVD detector 100 µm 4.3 mm Straw tubes, Φ = 6mm p beam 4.3 mm scCVD diamond four channels – metallization 100µm space between electrodes time resolution below 100 ps attached to a movable table, (µm step precision) straw tubes connected to the PADI v6 straw diameter: 6 mm Ar/CO2: 70%/30% HV: 1800 V DAQ /Trigger: Oscilloscope used as a DAQ (R&S 1044) correlated signal in two diamond electrodes used as a trigger  proton in the 100µm gap between electrodes. J. Pietraszko, DPG, Darmstadt, March 2016

7 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Experimental setup Straw tubes,  = 6mm p beam scCVD diamond detector mounted on movable table Real beam spot – Jülich beam time J. Pietraszko, DPG, Darmstadt, March 2016

8 Drift time measurement
Time difference between the scCVD diamond detector and Straw Signal from the PADI discriminator.  Drift time spectra (example for 5 positions) +2.0mm +1.5mm +1.0mm +0.0mm +0.5mm J. Pietraszko, DPG, Darmstadt, March 2016

9 Drift velocity estimation
J. Pietraszko, DPG, Darmstadt, March 2016

10 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Time resolution (2.26  0.05) ns J. Pietraszko, DPG, Darmstadt, March 2016

11 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Summary PADI chip for straw tube readout in CBM PADI-6 connected to straw tubes successfully tested with GeV Measured straw tube position resolution: about 160 µm CBM-TOF and CBM-MUCH (Straw) – similar readout  impact on CBM readout Diamonds for MIPs Excellent time resolution for MIPs, below 100ps Position resolution better than 50 µm and can be improved (HV) Possible improvement – additional diamond in front of the setup  better background rejection We would like to thank D. Prasuhn and the accelerator group of COSY for their extensive help. J. Pietraszko, DPG, Darmstadt, March 2016

12 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Thank you for your attention! Thank you for your attention! J. Pietraszko, DPG, Darmstadt, March 2016

13 J. Pietraszko, DPG, Darmstadt, 14-18 March 2016
Thank you J. Pietraszko, DPG, Darmstadt, March 2016

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