Comparison of 35 and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll" id="d1e195" altimg="si15.gif"><mml:mn>50</mml:mn><mml:mspace width="1em" class="nbsp"/><mml:mi mathvariant="normal">μ</mml:mi></mml:math>m thin HPK UFSD after neutron irradiation up to 6 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll" id="d1e203" altimg="si16.gif"><mml:mi>⋅</mml:mi></mml:math> 1015 neq/cm2

Zhao, Y.; Cartiglia, N.; Estrada, E.; Galloway, Z.; Gee, C. M.; Goto, Akiko; Luce, Z.; Mazza, S. M.; McKinney-Martinez, F.; Rodriguez, Rene; Sadrozinski, H.F.-W.; Seiden, A.; Cindro, V.; Kramberger, G.; Mandić, I.; Mikuž, M.; Zavrtanik, M.

doi:10.1016/j.nima.2018.08.040

Cited by 19 publications

(6 citation statements)

References 15 publications

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“…Previous results for single sensors before and after irradiation can be found in Refs. [2][3][4][5][6][7]. In this paper, the previous results have been confirmed and extended to results of LGAD arrays, including uniformity scans of the pad surface.…”

Section: Introductionsupporting

confidence: 74%

“…The breakdown voltage for arrays was found to be reduced (about 200 V for medium dose) due to the absence of a JTE around each pad as explained above. Beam tests and laboratory measurements have been performed in the past both for 300 µm, 50 µm and 35 µm thick LGADs, mostly single-pad devices [2][3][4][5][6][7]. In particular, results of laboratory studies on the devices of the same run used here can be found in Refs.…”

Section: Lgad Sensorsmentioning

confidence: 99%

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Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector

et al. 2018

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A : For the high luminosity upgrade of the LHC at CERN, ATLAS is considering the addition of a High Granularity Timing Detector (HGTD) in front of the end cap and forward calorimeters at |z| = 3.5 m and covering the region 2.4 < η < 4 to help reducing the effect of pile-up. The chosen sensors are arrays of 50 µm thin Low Gain Avalanche Detectors (LGAD). This paper presents results on single LGAD sensors with a surface area of 1.3×1.3 mm 2 and arrays with 2×2 pads with a surface area of 2×2 mm 2 or 3×3 mm 2 each and different implant doses of the p + multiplication layer. They are obtained from data collected during a beam test campaign in autumn 2016 with a pion beam of 120 GeV energy at the CERN SPS. In addition to several quantities measured inclusively for each pad, the gain, efficiency and time resolution have been estimated as a function of the position of the incident particle inside the pad by using a beam telescope with a position resolution of few µm. Different methods to measure the time resolution are compared, yielding consistent results. The sensors with a surface area of 1.3×1.3 mm 2 have a time resolution of about 40 ps for a gain of 20 and of about 27 ps for a gain of 50 and fulfil the HGTD requirements. Larger sensors have, as expected, a degraded time resolution. All sensors show very good efficiency and time resolution uniformity. K: Solid state detectors; Timing detectors A X P : 1804.00622

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Section: Introductionsupporting

confidence: 74%

Section: Lgad Sensorsmentioning

confidence: 99%

Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector

et al. 2018

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“…Owing to the intrinsic impact-ionization gain (which is typically between 5 and 50) these devices can be very thin (20-50 µm) while achieving charge collection levels greater than their much thicker conventional counterparts. This allows a short collection time with a fast rising edge that results in very precise timing information (17-50 ps) [4,5,6,7,8]. LGADs were first developed by the Centro Nacional de Microelectrónica (CNM) Barcelona, with significant participation by the RD50 Collaboration [9].…”

Section: Introductionmentioning

confidence: 99%

A new approach to achieving high granularity for silicon diode detectors with impact ionization gain

Ayyoub¹,

Gee²,

Islam³

et al. 2021

Preprint

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Low Gain Avalanche Diodes (LGADs) are thin (20-50 µm) silicon diode sensors with modest internal gain (typically 5 to 50) and exceptional time resolution (17 ps to 50 ps). However, the granularity of such devices is limited to the millimeter scale due to the need to include protection structures at the boundaries of the readout pads to avoid premature breakdown due to large local electric fields. In this paper we present a new approachthe Deep-Junction LGAD (DJ-LGAD) -that decouples the high-field gain region from the readout plane. This approach is expected to improve the achievable LGAD granularity to the tens-of-micron scale while maintaining direct charge collection on the segmented electrodes.

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“…The Institute of High Energy Physics (IHEP) of the Chinese Academy of Science cooperated with Novel Device Laboratory (NDL) [8] on LGAD sensor development since 2019. Many irradiation studies have been performed for the HPK and CNM LGAD sensors [5,6,9,10,11], but the properties of NDL LGADs haven't been studied after proton irradiation. This paper studied the timing resolution and charge collection of NDL LGAD after proton irradiation up to 1.02 ⇥10 15 n eq /cm 2 at Cyclotron and Radioisotope Center (CYRIC) in Japan.…”

Section: Introductionmentioning

confidence: 99%

Radiation hardness of the low gain avalanche diodes developed by NDL and IHEP in China

Fan

Alderweireldt

Agapopoulou

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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This paper studied the radiation hardness of low gain avalanche detector (LGAD) developed by the Novel Device Laboratory (NDL) in Beijing and the Institute of High Energy Physics (IHEP) of Chinese Academy of Sciences, in the context of an upgrade project of the ATLAS detector for the high luminosity phase of LHC. NDL LGAD sensors with di↵erent layouts, epitaxial resistivity, doping profile were irradiated up to 1.02 ⇥10 15 n eq /cm 2 by 70 MeV proton at Cyclotron and Radioisotope Center (CYRIC). The timing resolution of NDL LGAD sensors reached 50 picoseconds (ps) and the collected charge reached 3-4 Femtocoulombs (fC) after irradiation.

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Comparison of 35 and 50μm thin HPK UFSD after neutron irradiation up to 6 ⋅ 1015 neq/cm2

Cited by 19 publications

References 15 publications

Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector

Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector

A new approach to achieving high granularity for silicon diode detectors with impact ionization gain

Radiation hardness of the low gain avalanche diodes developed by NDL and IHEP in China

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