For any experiment that uses the beam of an accelerator, monitoring the beam intensity is always an important concern. It is particularly useful if one can continuously measure the beam current without disturbing the ...For any experiment that uses the beam of an accelerator, monitoring the beam intensity is always an important concern. It is particularly useful if one can continuously measure the beam current without disturbing the beam. We report here on test experiments for an Integrating Current Transformer （ICT） used to measure fast extraction beams from the HIRFL-CSR main ring （CSRm）. The laboratory tests and beam intensity measurement results are presented in this paper. The influence of the kicker noise is also analyzed.展开更多
Man-made superheavy elements(SHE)are produced as energetic recoils in complete-fusion reactions and need to be thermalized in a gas-filled chamber for chemical studies.The ever-shorter half-lives and decreasing produc...Man-made superheavy elements(SHE)are produced as energetic recoils in complete-fusion reactions and need to be thermalized in a gas-filled chamber for chemical studies.The ever-shorter half-lives and decreasing production rates of the elements beyond Fl(atomic number Z=114)-the heaviest element chemically studied today-require the development of novel techniques for quantitative thermalization and fast extraction efficiency.The Universal high-density gas stopping Cell(UniCell),currently under construction,was proposed to achieve this.Within this work,we propose an Ion Transfer by Gas Flow(ITGF)device,which serves as a UniCell ejector to interface with a gas chromatography detector array for chemical studies.Detailed parameter optimizations,using gas dynamics and Monte Carlo ion-trajectory simulations,promise fast(within a few ms)and highly efficient(up to 100%)ion extraction across a wide mass range.These ions can then be transmitted quantitatively through the ITGF into the high-pressure environment needed for further chemical studies.展开更多
This paper presents an asymmetric anode structure and cathode extraction fast and soft recovery diode.The device anode is partial-heavily doped and partial-lightly doped.Theregion is introduced into the cathode.Firstl...This paper presents an asymmetric anode structure and cathode extraction fast and soft recovery diode.The device anode is partial-heavily doped and partial-lightly doped.Theregion is introduced into the cathode.Firstly,the characteristics of the diode are simulated and analyzed.Secondly,the diode was fabricated and its characteristics were tested.The experimental results are in good agreement with the simulation results.The results show that,compared with the P–i–N diode,although the forward conduction characteristic of the diode is declined,the reverse recovery peak current is reduced by 47%,the reverse recovery time is shortened by 20%and the softness factor is doubled.In addition,the breakdown voltage is increased by 10%.展开更多
文摘For any experiment that uses the beam of an accelerator, monitoring the beam intensity is always an important concern. It is particularly useful if one can continuously measure the beam current without disturbing the beam. We report here on test experiments for an Integrating Current Transformer （ICT） used to measure fast extraction beams from the HIRFL-CSR main ring （CSRm）. The laboratory tests and beam intensity measurement results are presented in this paper. The influence of the kicker noise is also analyzed.
基金This work was supported by the German BMBF (No.05P21UMFN2)
文摘Man-made superheavy elements(SHE)are produced as energetic recoils in complete-fusion reactions and need to be thermalized in a gas-filled chamber for chemical studies.The ever-shorter half-lives and decreasing production rates of the elements beyond Fl(atomic number Z=114)-the heaviest element chemically studied today-require the development of novel techniques for quantitative thermalization and fast extraction efficiency.The Universal high-density gas stopping Cell(UniCell),currently under construction,was proposed to achieve this.Within this work,we propose an Ion Transfer by Gas Flow(ITGF)device,which serves as a UniCell ejector to interface with a gas chromatography detector array for chemical studies.Detailed parameter optimizations,using gas dynamics and Monte Carlo ion-trajectory simulations,promise fast(within a few ms)and highly efficient(up to 100%)ion extraction across a wide mass range.These ions can then be transmitted quantitatively through the ITGF into the high-pressure environment needed for further chemical studies.
基金Project supported by the National Natural Science Foundation of China(No.51177133)
文摘This paper presents an asymmetric anode structure and cathode extraction fast and soft recovery diode.The device anode is partial-heavily doped and partial-lightly doped.Theregion is introduced into the cathode.Firstly,the characteristics of the diode are simulated and analyzed.Secondly,the diode was fabricated and its characteristics were tested.The experimental results are in good agreement with the simulation results.The results show that,compared with the P–i–N diode,although the forward conduction characteristic of the diode is declined,the reverse recovery peak current is reduced by 47%,the reverse recovery time is shortened by 20%and the softness factor is doubled.In addition,the breakdown voltage is increased by 10%.
