کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8165920 | 1526222 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ion mobility measurements in Ar-CO2, Ne-CO2, and Ne-CO2-N2 mixtures, and the effect of water contents
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
ابزار دقیق
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A detector has been constructed for measuring ion mobilities of gas mixtures at atmospheric pressure and room temperature. The detector consists of a standard triple GEM amplification region and a drift region where ions drift. A method has been developed to measure the ions' arrival time at a cathode wire-grid by differentiating the recorded signals on this electrode. Simulations prove that this method is accurate and robust. The ion mobility in different gas mixtures is measured while applying different drift field values ranging from 200 V cmâ1 to 1100 V cmâ1. From an extrapolation of a Blanc's law fit to measurements in Ar-CO2 mixtures we find the reduced mobility of the drifting (cluster) ion species in pure argon to be 1.94±0.01  cm2 Vâ1 sâ1 and in pure carbon-dioxide to be 1.10±0.01  cm2 Vâ1 sâ1. Applying the same procedure to our measurements in Ne-CO2 yields 4.06±0.07  cm2 Vâ1 sâ1 and 1.09±0.01  cm2 Vâ1 sâ1 for the reduced mobilities in pure neon and carbon-dioxide, respectively. Admixtures of N2 to Ne-CO2 (90-10) reduce somewhat the mobility. For the baseline gas mixture of the future ALICE Time Projection Chamber, Ne-CO2-N2 (90-10-5), the measured reduced mobility of the drifting ions is 2.92±0.04  cm2 Vâ1 sâ1. Ion mobilities are examined for different water content ranging from 70 ppm to about 2000 ppm in the gas using Ar-CO2 (90-10) and Ne-CO2 (90-10). A slight decrease of ion mobility is observed for the addition of several hundred ppm of water.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 904, 1 October 2018, Pages 1-8
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 904, 1 October 2018, Pages 1-8
نویسندگان
Alexander Deisting, Chilo Garabatos, Alexander Szabo,