A new signal readout method for position-sensitive multi-output detectors,such as those in high-energy spectroscopy measurement and nuclear imaging,was developed by combining the charge division circuit,summing circui...A new signal readout method for position-sensitive multi-output detectors,such as those in high-energy spectroscopy measurement and nuclear imaging,was developed by combining the charge division circuit,summing circuit and charge-to-time conversion(QTC) circuit.The 64 outputs of a Hamamatsu H8500 position-sensitive photomultiplier tube were processed,and three digital pulses were generated.The widths of digital pulses were determined using the time-to-digital converter in an field programmable gate array.The energy and position information of incident y-rays is estimated based on the proportionality between the width of digital pulses and input charge created by y-photons.A prototype was built using discrete components and tested,and the energy and position resolutions were improved compared with that obtained with standard ADCs.This method greatly simplifies the front-end electronics and the digital interface.It enables a compact electronics system and an easy integration into an ASIC.展开更多
In conventional ion-atom collision experimental investigations, the fragments produced in the reaction are projected to a simple detector by static electric field. This technique only gives time-of-flight of the fragm...In conventional ion-atom collision experimental investigations, the fragments produced in the reaction are projected to a simple detector by static electric field. This technique only gives time-of-flight of the fragments, consequently one obtains only one-dimension information of the fragment. In order to investigate the complete dynamics of ion-molecule collisions, it is necessary to develop a position-sensitive multi-hit detector system. The position information was obtained by using the wedge-and-strip anode with very good resolution.展开更多
基金supported by the National Key Scientific Instrument and Equipment Development Project(No.2011YQ120096)National Instrumentation Program(No.2013YQ030629)the National Natural Science Foundation of China(Nos.11475206,11175200 and11205170)
文摘A new signal readout method for position-sensitive multi-output detectors,such as those in high-energy spectroscopy measurement and nuclear imaging,was developed by combining the charge division circuit,summing circuit and charge-to-time conversion(QTC) circuit.The 64 outputs of a Hamamatsu H8500 position-sensitive photomultiplier tube were processed,and three digital pulses were generated.The widths of digital pulses were determined using the time-to-digital converter in an field programmable gate array.The energy and position information of incident y-rays is estimated based on the proportionality between the width of digital pulses and input charge created by y-photons.A prototype was built using discrete components and tested,and the energy and position resolutions were improved compared with that obtained with standard ADCs.This method greatly simplifies the front-end electronics and the digital interface.It enables a compact electronics system and an easy integration into an ASIC.
文摘In conventional ion-atom collision experimental investigations, the fragments produced in the reaction are projected to a simple detector by static electric field. This technique only gives time-of-flight of the fragments, consequently one obtains only one-dimension information of the fragment. In order to investigate the complete dynamics of ion-molecule collisions, it is necessary to develop a position-sensitive multi-hit detector system. The position information was obtained by using the wedge-and-strip anode with very good resolution.
