24-25 June 2013
Centro Nacional de Aceleradores (CNA)
Europe/Madrid timezone

Printed-circuit solutions for nuclear experiment setups

24 Jun 2013, 16:30
Centro Nacional de Aceleradores (CNA)

Centro Nacional de Aceleradores (CNA)

Thomas Alva Edison, 7 Parque Tecnológico Cartuja'93 41092 Sevilla SPAIN


Mr. Angel Perea Martinez (IEM/CSIC)


The use of increasingly segmented silicon detectors in nuclear reaction experiments poses challenging constraints on the design of the experimental chambers, as several detectors and related pieces should be placed in a extremely reduced space, attending to the experimental positions required by the physics of the experiment. At the same time, a large number of signals (usually in excess of 100) must be routed out of the chamber to the preamplifiers sitting outside. Traditionally this has been done with coaxial feedthroughs, but they introduce several problems of their own: sealing o-rings are prone to leaks and the solderings usually get brittle after several uses, leading to shortcuts or missing channels. Besides, placement of the detectors is also compromised as the bulky of 32+ pole cables (plus jacket) put unwanted stresses on them. Achieving the required position precision for the detectors is sometimes also hard. We present several related solutions to those problems using Printed Circuit Boards (PCBs) both for placement and feedthrough. Use of multilayered PCBs allows for large improvement in feedthrough density (taken as number of signals fed-through per unit area), usually several times the achieved with the standard coaxial feedthroughs, at a fraction of the cost. In an alternative design, the use of PCBs all the way to the preamp, minimizes both the cable use and the number of connectors, restricting them only to the inner part of the chamber, where they are effectively isolated from RF noise. Signals come out shielded by ground planes all the way to the preamp. Placement is also efectively achieved by plugging the detectors directly on a card. Using a two cards stack arrangement, different setups can be achieved by switching cards without altering the preamp layout and calibrations. We've succesfully tested a chamber design for 11Be experiment at TRIUMF (Canada), and developed a second chamber for an incoming experiment at Jyvaskyla (Finland). Both designs are presented in the current talk.
Oral or poster presentation Oral

Primary author

Mr. Angel Perea Martinez (IEM/CSIC)


Prof. Olof Tengblad (IEM/CSIC)

Presentation Materials

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