دانلود رایگان مقاله انگلیسی توسعه یک مانیتور انتقال برای پرتوهای فوتون با شدت بالا - الزویر 2018

عنوان فارسی
توسعه یک مانیتور انتقال برای پرتوهای فوتون با شدت بالا
عنوان انگلیسی
Development of a transmittance monitor for high-intensity photon beams
صفحات مقاله فارسی
0
صفحات مقاله انگلیسی
7
سال انتشار
2018
نشریه
الزویر - Elsevier
فرمت مقاله انگلیسی
PDF
نوع مقاله
ISI
نوع نگارش
مقالات پژوهشی (تحقیقاتی)
رفرنس
دارد
پایگاه
اسکوپوس
کد محصول
E9537
رشته های مرتبط با این مقاله
فیزیک
گرایش های مرتبط با این مقاله
فیزیک کاربردی
مجله
ابزار و روش های هسته ای در تحقیقات فیزیک - Nuclear Inst. and Methods in Physics Research
دانشگاه
Research Center for Electron Photon Science (ELPH) - Tohoku University - Japan
کلمات کلیدی
فوتون نشاندار، بازده نشاندار، انتقال فوتون، Meson photoproduction، FPGA
doi یا شناسه دیجیتال
https://doi.org/10.1016/j.nima.2018.06.025
چکیده

ABSTRACT


A transmittance monitor has been developed for the second tagged-photon beamline at the Research Center for Electron Photon Science, Tohoku University, Japan. In this beamline, an internal radiator is employed to produce the bremsstrahlung photon beam out of circulating electrons in a synchrotron. The transmittance, which is defined as the probability of finding a photon coming to the target position when an electron is detected with a photon-tagging counter, should be determined to deduce cross sections for photo-induced reactions. The developed monitor consists of a telescope of thin plastic scintillators with a positron and electron converter, and a dedicated circuit implemented in a field-programmable gate array chip. The transmittance can be measured with this monitor for high-intensity photon beams corresponding to 20 MHz tagging signals. The measured transmittance is found to be constant with respect to the photon intensity for each photon-tagging channel.

نتیجه گیری

4. Summary


A photon-transmittance monitor has been developed for the second tagged-photon beamline at ELPH. The developed monitor consists of a telescope of thin plastic scintillators with an ? +? − converter, and a dedicated circuit implemented in an FPGA-based logic module. The transmittance, ?? , can be obtained from the response probability of the detector, ?? , and sampling ratio (the probability of ? +? − production with the converter), ?? . The ?? is determined using faint beams by comparing the ?? and directly measured ?? with an EMC module. The ?? is found to be 0.00665±0.00017(sta.)±0.00015(sys.). The ?? can be successfully measured with this monitor for high-intensity photon beams corresponding to 20 MHz tagging signals. The measured ?? is found to be constant with respect to the photon intensity for each photon-tagging channel within the statistical error (approximately ±5%). This suggests that ?? is constant independently of the circulating current. The accuracy of the transmittance measured at high intensity is expected to be ±5% owing to the uncertainty of ?? .


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