2022 Volume 15 Pages E21-007-1-E21-007-10
The super Pioneering High-Energy Nuclear Interaction eXperiment (sPHENIX), which aims to unravel the mysteries of the creation of the universe, is scheduled to be launched in 2023 at Brookhaven National Laboratory, U.S.A, using the relativistic heavy ion collider. As a typical high-energy particle accelerator-based experiment, the collision area of sPHENIX is to be tightly occupied with various radiation detectors, requiring a minimal special budget to run cables and transmit massive signals generated by these detectors to downstream electronics for data processing located in a remote distance. Accordingly, a long, high signal line-density cable has been developed based on the flexible printed circuit (FPC) technology. FPC comprises multilayers and has extraordinarily long and thin transmission lines. Liquid crystal polymer was employed to suppress losses in transmission lines. Electrical characteristics were evaluated using S-parameters, time domain reflectometry, and eye-diagrams. Furthermore, we have developed manufacturing technology to achieve high-precision microfabrication and improved reliability, which has been demonstrated in peel strength and thermal shock tests. FPC is currently in the mass production phase.
