Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Instrumentation
HK 49.7: Talk
Tuesday, March 5, 2013, 18:15–18:30, WIL-C207
New fiber detector with nXyter readout for tracking of radioactive beams — •Philipp Schrock — Institut für Kernphysik, TU Darmstadt
The R3B setup (Reactions with Relativistic Radioactive Beams) at FAIR will allow kinematically complete measurements in order to study various astrophysical and nuclear structure questions. The mass number A of the beamlike particles will be determined from the deflection in a magnetic field. To achieve an adequate mass resolution a new fiber detector for tracking of heavy fragments has been designed and tested.
The detector is built of 1024 scintillating optical fibers with a width of 250 µm each. All individual fibers are read out separately. The needed 1024 electronic channels are realized by using position sensitive photomultiplier tubes and nXyter (neutron-X-Y-time-energy read-out) chips. The nXyter is a self-triggered ASIC with 128 independent channels which buffer charge and time information for each hit in each fiber. It is included in the triggered R3B-LAND setup with the help of "Gemex" front-end boards. Each board has implemented two nXyter and an FPGA which controls the nXyter and which sorts their data to packages with respect to external triggers.
The detector was in use with different modifications of Gemex boards during several experiments, partially in vacuum. Besides the detector itself a first analysis of its data will be presented.
This work is supported by HIC for FAIR, GSI, NAVI and the BMBF project 06DA7047I.