First operation of a multi-channel Q-Pix prototype: measuring transverse electron diffusion in a gas time projection chamber
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Hoch, Nora Seidel, Olivia Chirayath, Varghese A. Enriquez, Alfredo Gramellini, Elena Guenette, Roxanne Jaidee, I-See W. Keefe, Kevin Kohani, Shahab Kubota, Shion Mahdy, Hany McDonald, Austin Mei, Yuan Miao, Peng Newcomer, F. Mitch Nygren, David Parmaksiz, Ilker Rooks, Michael Tzoka, Iakovos Wei, Wenzhao Asaadi, Jonathan Battat, James B. R. |
| author_facet | Hoch, Nora Seidel, Olivia Chirayath, Varghese A. Enriquez, Alfredo Gramellini, Elena Guenette, Roxanne Jaidee, I-See W. Keefe, Kevin Kohani, Shahab Kubota, Shion Mahdy, Hany McDonald, Austin Mei, Yuan Miao, Peng Newcomer, F. Mitch Nygren, David Parmaksiz, Ilker Rooks, Michael Tzoka, Iakovos Wei, Wenzhao Asaadi, Jonathan Battat, James B. R. |
| contents | We report measurements of the transverse diffusion of electrons in P-10 gas (90% Ar, 10% CH4) in a laboratory-scale time projection chamber (TPC) utilizing a novel pixelated signal capture and digitization technique known as Q-Pix. The Q-Pix method incorporates a precision switched integrating transimpedance amplifier whose output is compared to a threshold voltage. Upon reaching the threshold, a comparator sends a 'reset' signal, initiating a discharge of the integrating capacitor. The time difference between successive resets is inversely proportional to the average current at the pixel in that time interval, and the number of resets is directly proportional to the total collected charge. We developed a 16-channel Q-Pix prototype fabricated from commercial off-the-shelf components and coupled them to 16 concentric annular anode electrodes to measure the spatial extent of the electron swarm that reaches the anode after drifting through the uniform field of the TPC. The swarm is produced at a gold photocathode using pulsed UV light. The measured transverse diffusion agrees with simulations in PyBoltz across a range of operating pressures (200-1500 Torr). These results demonstrate that a Q-Pix readout can successfully reconstruct the ionization topology in a TPC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_05734 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First operation of a multi-channel Q-Pix prototype: measuring transverse electron diffusion in a gas time projection chamber Hoch, Nora Seidel, Olivia Chirayath, Varghese A. Enriquez, Alfredo Gramellini, Elena Guenette, Roxanne Jaidee, I-See W. Keefe, Kevin Kohani, Shahab Kubota, Shion Mahdy, Hany McDonald, Austin Mei, Yuan Miao, Peng Newcomer, F. Mitch Nygren, David Parmaksiz, Ilker Rooks, Michael Tzoka, Iakovos Wei, Wenzhao Asaadi, Jonathan Battat, James B. R. High Energy Physics - Experiment Instrumentation and Detectors We report measurements of the transverse diffusion of electrons in P-10 gas (90% Ar, 10% CH4) in a laboratory-scale time projection chamber (TPC) utilizing a novel pixelated signal capture and digitization technique known as Q-Pix. The Q-Pix method incorporates a precision switched integrating transimpedance amplifier whose output is compared to a threshold voltage. Upon reaching the threshold, a comparator sends a 'reset' signal, initiating a discharge of the integrating capacitor. The time difference between successive resets is inversely proportional to the average current at the pixel in that time interval, and the number of resets is directly proportional to the total collected charge. We developed a 16-channel Q-Pix prototype fabricated from commercial off-the-shelf components and coupled them to 16 concentric annular anode electrodes to measure the spatial extent of the electron swarm that reaches the anode after drifting through the uniform field of the TPC. The swarm is produced at a gold photocathode using pulsed UV light. The measured transverse diffusion agrees with simulations in PyBoltz across a range of operating pressures (200-1500 Torr). These results demonstrate that a Q-Pix readout can successfully reconstruct the ionization topology in a TPC. |
| title | First operation of a multi-channel Q-Pix prototype: measuring transverse electron diffusion in a gas time projection chamber |
| topic | High Energy Physics - Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2402.05734 |