ASET Colloquium
Digital Signal Processing for Complete Spectroscopy of Rotating Nuclei
by Dr. Rudrajyoti Palit (DNAP, TIFR)
Friday, March 25, 2011
from
to
(Asia/Kolkata)
at Colaba Campus ( AG-66 )
at Colaba Campus ( AG-66 )
Description |
High resolution gamma ray spectroscopy using large array of high purity germanium detectors is extremely effective to probe the nuclear shapes at varying angular momentum and isospin. Improved sensitivity of such array continues to provide new insight on the shell structure and residual interactions among the nucleons which determine the nuclear shape. The Indian National Gamma ray detector Array (INGA) is recently commissioned at the TIFR-BARC accelerator facility. INGA is designed for 24 Compton suppressed clover detectors. For optimum utilization of the detector array the associated data acquisition (DAQ) system needs to satisfy a variety of requirements some of which are conflicting with each other. The requirement of the DAQ of the array is to provide the energy and timing information for all the 96 channels for 24 clovers vetoed with the Compton suppressed BGO shields even at high count rate. Coupling the clover detector data acquisition system with other ancillary detectors is also required. A digital data acquisition system based on PCI-PXI based architecture meets the aforementioned requirements. In this DAQ, each pre-amplifier signal is digitized at 100 MHz sampling speed separately and further processed digitally to extract required information about the incident radiation. One such digital DAQ is implemented at TIFR for the ongoing experiments using the array. Compared to our conventional systems with analog shaping, the new digital system provides higher throughput, better energy resolution and better stability. Recent results obtained from the array will be compared to the conventional systems with analog shaping. Its scope for future nuclear structure experiments and medical imaging will be discussed. |
Material: | |
Organised by | Dr. Satyanarayana Bheesette |