Speaker
Description
In micropattern gas detectors, the Gas Electron Multiplier (GEM) is a proven amplification method for the position detection of ionising radiation, such as charged particles, photons, X-rays, and neutrons. GEM detectors have been used in high energy physics experiments due to their excellent spatial and time resolution, high-rate capabilities, and flexibility in design. The principle is based on a novel concept of charge amplification in gas where GEM foils placed inside the detector enable charge amplification in the presence of an electric field. A GEM is constructed from a thin polymer foil coated with metal that has a dense concentration of chemically created holes. The microscopic structure of GEM provides a spatial resolution of better than 100$\mu$m which makes it a potential candidate for imaging. An effort is being made to use triple GEM as an imaging detector for medical applications as well as scanning in commercial containers since such scanning devices can be constructed to a large size using GEMs. The hit location of the incoming radiation and the avalanche charge deposition on the readout plane are used to reconstruct an image. The experiment is carried out in X-ray with a flux $\sim1000Hz/cm^2$ and cluster size, energy deposition cuts are implemented to extract images with improved resolutions. Object and material identification and dimension measurements have also been carried out from the reconstructed image. Our results show a sub-millimetre resolution for finding the dimensions of the scanned object and less than 1% uncertainty in the identification of the material. I will be presenting an imaging technique using GEM along with the current results and the possible improvement in future research.
| Session | Future Experiments and Detector Development |
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