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Title	High-voltage pixel sensors for ATLAS upgrade
Author(s)	Perić, I (Heidelberg U.) ; Kreidl, C (Heidelberg U.) ; Fischer, P (Heidelberg U.) ; Bompard, F (Marseille, CPPM) ; Breugnon, P (Marseille, CPPM) ; Clemens, J -C (Marseille, CPPM) ; Fougeron, D (Marseille, CPPM) ; Liu, J (Marseille, CPPM) ; Pangaud, P (Marseille, CPPM) ; Rozanov, A (Marseille, CPPM) ; Barbero, M (Marseille, CPPM) ; Feigl, S (CERN) ; Capeans, M (CERN) ; Ferrere, D (CERN) ; Pernegger, H (CERN) ; Ristic, B (CERN) ; Muenstermann, D (Geneva U.) ; Gonzalez Sevilla, S (Geneva U.) ; La Rosa, A (Geneva U.) ; Miucci, A (Geneva U.) ; Nessi, M (Geneva U.) ; Iacobucci, G (Bonn U.) ; Backhaus, M (Bonn U.) ; Hügging, Fabian (Bonn U.) ; Krüger, H (Bonn U.) ; Hemperek, T (Bonn U.) ; Obermann, T (Bonn U.) ; Wermes, N (Bonn U.) ; Garcia-Sciveres, M (LBNL, Berkeley) ; Quadt, A (Gottingen U.) ; Weingarten, J (Gottingen U.) ; George, M (Gottingen U.) ; Grosse-Knetter, J (Gottingen U.) ; Rieger, J (Gottingen U.) ; Bates, R (Glasgow U.) ; Blue, A (Glasgow U.) ; Buttar, C (Glasgow U.) ; Hynds, D (Glasgow U.)
Publication	2014
Number of pages	5
In:	Nucl. Instrum. Methods Phys. Res., A 765 (2014) 172-176
In:	9th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Hiroshima, Japan, 2 - 6 Sep 2013, pp.172-176
DOI	10.1016/j.nima.2014.06.035
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The high-voltage (HV-) CMOS pixel sensors offer several good properties: a fast charge collection by drift, the possibility to implement relatively complex CMOS in-pixel electronics and the compatibility with commercial processes. The sensor element is a deep n-well diode in a p-type substrate. The n-well contains CMOS pixel electronics. The main charge collection mechanism is drift in a shallow, high field region, which leads to a fast charge collection and a high radiation tolerance. We are currently evaluating the use of the high-voltage detectors implemented in 180 nm HV-CMOS technology for the high-luminosity ATLAS upgrade. Our approach is replacing the existing pixel and strip sensors with the CMOS sensors while keeping the presently used readout ASICs. By intelligence we mean the ability of the sensor to recognize a particle hit and generate the address information. In this way we could benefit from the advantages of the HV sensor technology such as lower cost, lower mass, lower operating voltage, smaller pitch, smaller clusters at high incidence angles. Additionally we expect to achieve a radiation hardness necessary for ATLAS upgrade. In order to test the concept, we have designed two HV-CMOS prototypes that can be readout in two ways: using pixel and strip readout chips. In the case of the pixel readout, the connection between HV-CMOS sensor and the readout ASIC can be established capacitively.
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