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Modeling detector response is a key challenge in time projection chambers. We cast this problem as an unpaired point cloud translation task, between data collected from simulations and from experimental runs. Effective translation can assist with both noise rejection and the construction of high-fidelity simulators. Building on recent work in diffusion probabilistic models, we present a novel framework for performing this mapping. We demonstrate the success of our approach in both synthetic domains and in data sourced from the Active-Target Time Projection Chamber.
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This content will become publicly available on September 1, 2026
Correcting beam space charge effects in Active-Target Time Projection Chamber
By providing a large gaseous volume for nuclear interactions while simultaneously recording the tracks of resulting reaction products, an active target serves as both a thick target and a detector. Once a reaction occurs, the emitted charged fragments strip electrons from the target gas along their path as they transverse the detector. Collection of these stripped electrons allow for detection of the product tracks. As beam intensity increases, the resulting ionization in the active target can significantly distort this collection of electrons. If left uncorrected, the resulting measurements could be wrong. In this paper, we investigate the impact of the space charge produced by heavy radioactive beams within the Active Target - Time Projection Chamber at Michigan State University. The beams are injected parallel to the electric field of the time projection chamber which is operated without a magnetic field for this experiment. We analyze the rate dependence of the space charge effects and demonstrate that they can be modeled and effectively corrected.
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- Award ID(s):
- 2209145
- PAR ID:
- 10600416
- Publisher / Repository:
- Elsevier Science Direct
- Date Published:
- Journal Name:
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Volume:
- 1078
- Issue:
- C
- ISSN:
- 0168-9002
- Page Range / eLocation ID:
- 170563
- Subject(s) / Keyword(s):
- Active target Space charge, Time projection chamber Drift distortions Particle tracking Radioactive beams
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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