M. van Beuzekom , Y. Bilevych , K. Desch , S. van Doesburg , H. van der Graaf , F. Hartjes , J. Kaminski , P.M. Kluit , N. van der Kolk , C. Ligtenberg , G. Raven , J. Timmermans
{"title":"Towards a Pixel TPC part I: Construction and test of a 32-chip GridPix detector","authors":"M. van Beuzekom , Y. Bilevych , K. Desch , S. van Doesburg , H. van der Graaf , F. Hartjes , J. Kaminski , P.M. Kluit , N. van der Kolk , C. Ligtenberg , G. Raven , J. Timmermans","doi":"10.1016/j.nima.2025.170397","DOIUrl":null,"url":null,"abstract":"<div><div>A Time Projection Chamber (TPC) module with 32 GridPix chips was constructed and the performance was measured using data taken in a testbeam at DESY in 2021. The GridPix chips each consist of a Timepix3 ASIC (TPX3) with an integrated amplification grid and have a high efficiency of about 85% to detect single ionisation electrons. In the testbeam setup, the module was placed in between two sets of Mimosa26 silicon detector planes that provided external high-precision tracking and the whole detector setup was slid into the PCMAG magnet at DESY. The TPC could be operated reliably and used a 95/3/2 gas mixture (by volume) of Ar/CF<span><math><mn>4</mn></math></span>/iC<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span>H<sub>10</sub> with a small amount of oxygen and water vapour. The analysed data were taken at electron beam momenta of 5 and 6 GeV/c and at magnetic fields of 0 and 1 T.</div><div>The result for the transverse diffusion coefficient <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> is (287.2 ± 0.5) <span><math><mi>μ</mi></math></span>m/<span><math><msqrt><mrow><mi>cm</mi></mrow></msqrt></math></span> at <span><math><mi>B</mi></math></span> = 0 T and <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> (120.3 ± 0.5) <span><math><mi>μ</mi></math></span>m/<span><math><msqrt><mrow><mi>cm</mi></mrow></msqrt></math></span> at <span><math><mi>B</mi></math></span> = 1 T. The longitudinal diffusion coefficient <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span> is measured to be (251 ± 14) <span><math><mi>μ</mi></math></span>m/<span><math><msqrt><mrow><mi>cm</mi></mrow></msqrt></math></span> at <span><math><mi>B</mi></math></span> = 0 T and (224 ± 14) <span><math><mi>μ</mi></math></span>m/<span><math><msqrt><mrow><mi>cm</mi></mrow></msqrt></math></span> at <span><math><mi>B</mi></math></span> = 1 T. Results for the tracking systematical uncertainties in <span><math><mrow><mi>x</mi><mi>y</mi></mrow></math></span> (pixel plane) were measured to be 13 <span><math><mi>μ</mi></math></span>m with and without magnetic field. The tracking systematical uncertainties in <span><math><mi>z</mi></math></span> (drift direction) were 15 <span><math><mi>μ</mi></math></span>m (<span><math><mi>B</mi></math></span> = 0 T) and 20 <span><math><mi>μ</mi></math></span>m (<span><math><mi>B</mi></math></span> = 1 T).</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1075 ","pages":"Article 170397"},"PeriodicalIF":1.5000,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0168900225001986","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"INSTRUMENTS & INSTRUMENTATION","Score":null,"Total":0}
引用次数: 0
Abstract
A Time Projection Chamber (TPC) module with 32 GridPix chips was constructed and the performance was measured using data taken in a testbeam at DESY in 2021. The GridPix chips each consist of a Timepix3 ASIC (TPX3) with an integrated amplification grid and have a high efficiency of about 85% to detect single ionisation electrons. In the testbeam setup, the module was placed in between two sets of Mimosa26 silicon detector planes that provided external high-precision tracking and the whole detector setup was slid into the PCMAG magnet at DESY. The TPC could be operated reliably and used a 95/3/2 gas mixture (by volume) of Ar/CF/iCH10 with a small amount of oxygen and water vapour. The analysed data were taken at electron beam momenta of 5 and 6 GeV/c and at magnetic fields of 0 and 1 T.
The result for the transverse diffusion coefficient is (287.2 ± 0.5) m/ at = 0 T and (120.3 ± 0.5) m/ at = 1 T. The longitudinal diffusion coefficient is measured to be (251 ± 14) m/ at = 0 T and (224 ± 14) m/ at = 1 T. Results for the tracking systematical uncertainties in (pixel plane) were measured to be 13 m with and without magnetic field. The tracking systematical uncertainties in (drift direction) were 15 m ( = 0 T) and 20 m ( = 1 T).
期刊介绍:
Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section.
Theoretical as well as experimental papers are accepted.