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Feasibility Study on the Total Ionizing Dose Effect of the Alice Pixel Detector(ALPIDE) and the Korea Multi-Purpose Accelerator Complex(KOMAC)
New Phys.: Sae Mulli 2019; 69: 283~289
Published online March 29, 2019;
© 2019 New Physics: Sae Mulli.

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

Department of Physics, Pusan National University, Busan 46241, Korea
Correspondence to:
Received January 28, 2019; Revised February 7, 2019; Accepted February 11, 2019.
cc 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.
PACS numbers: 07.77.Ka
Keywords: Nuclear Physics, Radiation Hardness, CMOS MAPS

March 2019, 69 (3)
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