npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2019; 69: 283-289

Published online March 29, 2019

Copyright © New Physics: Sae Mulli.

Feasibility Study on the Total Ionizing Dose Effect of the Alice Pixel Detector(ALPIDE) and the Korea Multi-Purpose Accelerator Complex(KOMAC)

20 MeV 양성자 빔을 이용한 ALPIDE(ALICE Pixel Detector)의 총 이온화 선량 효과 측정가능성 연구

Jongsik EUM*, Minjae KWON, Sanghyeon LEE, Jihye SONG, In-Kwon YOO

Department of Physics, Pusan National University, Busan 46241, Korea


Received: January 28, 2019; Revised: February 7, 2019; Accepted: February 11, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


The ALPIDE (ALICE Pixel Detector) is a silicon pixel detector based on Complementary Metal-Oxide Semiconductor(CMOS) Monolithic Active Pixel Sensor(MAPS) technology to be used for the upgrade of the Inner Tracking System (ITS) in ALICE(A Large Ion Collider Experiment) during its long shutdown 2 (LS2, 2019-2020). The Total Ionizing Dose (TID) effect is one of the radiation hardness tests for any device affected by ionizing energy loss processes. To use the proton beam provided by KOMAC (KOrea Multi-Purpose Accelerator Complex) to study the TID effect, we performed a feasibility study with 20-MeV proton beam with a flux of 10$^{14}$/cm$^2$s. Because the flux is too high for direct irradiation of ALPIDE, secondary protons scattered by a Au foil are used to reduce the beam flux. Faraday cups are used to monitor the beam flux, and the radiation doses are extracted by comparing the data measured in two different types of Faraday cups with the results of Geant4 simulations. The ALPIDE is gradually irradiated in 34 steps, and the linearity of the Digital-to-Analogue Convertor(DAC) and the charge threshold are measured at each step. Based on these results, we discuss the feasibility of using the proton beam at KOMAC to study the TID effect on silicon sensors.

Keywords: Nuclear Physics, Radiation Hardness, CMOS MAPS

ALPIDE는 거대-이온-충돌기-실험(A Large Ion Collider Experment, ALICE)에서 내부 궤적 장치 (Inner Tracking System, ITS) 업그레이드를 위하여 단일형 활성 실리콘 픽셀 센서 (Monolithic Active Pixel Sensor, MAPS) 기술을 기반으로 새롭게 개발된 첨단 실리콘 픽셀검출기이다. 본 연구에서는 경주 양성자 가속기에서 ALPIDE의 방사선 내구성 테스트를 위한 총 이온화 선량 (Total Ionizing Dose, TID) 효과 연구가 가능할 것인지를 타진하였다. 이를 위해 20 MeV 양성자 펄스(pulse)빔을 사용하였으며, 선량을 낮추기 위해 금박으로 산란된 빔을 사용하였다. 패러데이 컵(Faraday cup)을 이용하여 산란된 양성자의 선속을 측정하였으며 총 34단계에 걸쳐 ALPIDE에 조사하였다. 각 단계별로 디지털-아날로그 변환기(Digital-to-Analogue Convertor, DAC)의 선형성 측정 및 전하 문턱값 측정을 수행하였다. 모의실험을 통하여 ALPIDE에 들어가는 흡수선량을 보정하고 측정 데이터를 분석하여 TID 효과가 ALPIDE 회로에 미친 영향을 측정하였다. 이 결과를 바탕으로 경주 양성자 가속기의 TID 효과 측정가능성에 대해 논의하였다.

Keywords: 핵물리, 검출기, MAPS, 방사선 내구성

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