CERN Accelerating science

CMS Note
Report number	CMS-CR-2019-213
Title	Prototyping of Hybrid Circuits for the CMS Phase-2 Outer Tracker Upgrade at the HL-LHC
Author(s)	Blanchot, Georges (CERN) ; Gadek, Tomasz (Zurich, ETH) ; Honma, Alan (Brown U.) ; Kovacs, Mark Istvan (CERN) ; Rasevic, Nikola (VINCA Inst. Nucl. Sci., Belgrade) ; La Rosa, Alessandro (CERN) ; Zografos, Angelos (Natl. Tech. U., Athens)
Publication	2020
Imprint	11 Oct 2019
Number of pages	7
In:	PoS TWEPP2019 (2020) 060
In:	TWEPP 2019 Topical Workshop on Electronics for Particle Physics, Santiago De Compostela, Spain, 2 - 6 Sep 2019, pp.060
DOI	10.22323/1.370.0060
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	High Density Interconnect hybrids are being developed for the CMS tracker Phase-2 upgrade for the HL-LHC. These hybrids are flexible circuits laminated to carbon fiber composite stiffeners and are assembled with flip-chips, passives and connectors. The wire bonding to sensors and the soldering requirements for these components requires an almost perfectly flat surface. A lamination process is proposed, focused on the compatibility with a lead-free reflow process. The stack-up of the hybrid was optimized to balance the forces induced by the Coefficient of Thermal Expansion (CTE) differences in the assembly. The proposed lamination process was applied to prototype 8CBC3 hybrid circuits.
Copyright/License	publication: © 2018-2024 The Authors (License: CC-BY-NC-ND-4.0)

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