From: A fast high-voltage switching multiwire proportional chamber

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Presentation transcript:

From: A fast high-voltage switching multiwire proportional chamber Fig. 1. Schematic of the MWPC. The small red dots represent anode wires, the large blue circles represent potential wires, and the black horizontal lines represent cathode planes. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 2. Dependence between the number of secondary electrons produced by avalanche multiplication and the applied voltage on the potential wires calculated by GARFIELD++. The pitch is the distance between an anode wire and a potential wire. The gap between the wire and the cathode planes is 3 mm. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 3. Contour plots in the upper left of (a) and (b) show the electric potential V of the MWPC calculated by GARFIELD++ for the cases in which (a) Vanode=1430 V and Vpotential=0 V, and (b) Vanode=Vpotential=1430 V. The right and bottom plots around each contour plot show the electric field |E| along x=0 and y=0, respectively. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 4. Timing schematic of an expected MWPC output waveform and HV switching. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 5. Schematic circuit diagram of HV switching. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 6. Wire sag due to electrostatic force calculated by GARFIELD. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 7. Measured discharge voltage (circles) and required voltage for a gain of 1×104 calculated by GARFIELD++ (squares). From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 8. Electric field |E| calculated by GARFIELD++ for the two-wire configuration with different conditions. Two wires with respective diameters of 15 and 50 μm and respective voltages of 1430 and 0 V are placed with a distance of 0.7 mm in both plots. (a) One anode and one potential wire configuration. (b) One anode, one potential wire configuration, and 0 V electrodes placed 3 mm from both wires. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 9. Schematic circuit diagram of the prototype chamber. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 10. Waveforms of the chamber, a reference detector, and a gate signal for the pulsed HV power supply. The chamber output is read out without amplifiers. We apply the HV on the potential wires during the period illustrated as the hatched region, while the voltage is set to zero in other periods. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 11. Current readout of the HV power supply for the anode wires as a function of HV switching timing for the potential wires (solid circles). The x-axis is the delay of the TTL-gate signal for the pulsed HV supply with respect to a timing signal from the accelerator. The pulse height of the scintillating fiber is shown as a reference for the beam intensity (solid squares) with values on the right vertical axis. The upper, lower left, and lower right images in Fig. 10 correspond to approximately 75, 72, and 70 μs in this figure, respectively. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 12. Beam test experiment setup. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

From: A fast high-voltage switching multiwire proportional chamber Fig. 13. MWPC output waveforms with a burst pulse around 56000 ns and the HV switching operation for the potential wires. The noise from HV switching is always the same, so subtracting the noise gives a clear waveform for the signal electron. Beam intensity fluctuation appears at around 56000 ns. Space charge effects do not degrade detector performance and a delayed electron signal is observed. From: A fast high-voltage switching multiwire proportional chamber Prog Theor Exp Phys. 2017;2017(2). doi:10.1093/ptep/ptw193 Prog Theor Exp Phys | © The Author(s) 2017. Published by Oxford University Press on behalf of the Physical Society of Japan.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.