| The comprehensive researches of Laser Ion Source (LIS) were carried out at the Institute of Modern Physics, Chinese Academic of Sciences. The two beam lines of the LIS were built, named No.1#and No.2#. The scientific purpose of No.1#beam line is deeply investigated the own techniques of LIS, another beam line is learned for the directly plasma injection scheme which straightforward connect the LIS with RFQ accelerator, the accelerated ion beam have achieved from the RFQ accelerator.The design works of LIS were included:laser optical path, experimental target chamber, beam diagnostics equipment, automation control system and collimating method of LIS, et al. In the design works of both the laser target chamber and optical path, the three different ideas were compared, these pros and cons of different project were shown completely. A self-design EIA (Electrostatic Ion Analyzer) was employed to analyze the ion beam charge states that were produced from the laser ion source at No.2#beam line. According to the experimental setup, a new EIA was designed that was used on No.2#beam line by us, the electromagnetic simulation software OPERA was employed, based on the simulated result, the "effective length" of EIA was calculated. These designs were verified by the experiment measurements that were satisfied to our expected. For the convenient purpose, a3-D manipulator were designed that can control the target during the experiment in the vacuum, the movement of those control items adopts actuating motors and precise sliders, the control software was developed by Labview. The synchronous system acts as an important role between LIS and RFQ, which was guaranteed the efficiency of injection laser plasma to the RFQ cavity, this principle layout of synchronous system was originally designed by us. Due to the laser focal spot size is very tiny, a new precise method of alignment was produced, the method includes:a K&E cubic precision optical level, cross-line laser and "string alignment method". Eventually, the laser focal spot on the target can put on the axis of the entire beam line easily.Due to the established beam line, the results of the charge states and total beam current of various target materials was achieved:the typical laser plasma experiment result was shown as follows:the carbon ion beam current (the maximum charge state was C6+) was13.65mA, the Al ion beam (the maximum charge state was Al12+) current was12.27mA, the Ti ion beam current (the maximum charge state was Ti16+) was7.87mA, the Ni ion beam current (the maximum charge state was Ni19+) was7.81mA, the Ag ion beam current (the maximum charge state was Ag20+) was3.06mA, the Ta ion beam current (the maximum charge state was Ta13+) was2.08mA, the lead ion beam current (the maximum charge state was Pb10+) was0.5mA. Moreover, the stability of LIS was measured that use the carbon target, the experimental counts of the last shots about one thousand. The peak time, peak current, FWHM and electric quantity were recorded. The analyzed results of these record parameters demonstrated the requirements of design and experimental goal was achieved.The experimental research aspect of LIS and RFQ, it was successfully that the synchronized accelerated ion beam was captured using self-designed synchronization system, the total current of accelerated ion beam was about16mA, that was clearly evidence to prove the validity of the synchronization system of LIS and RFQ. According to changing the different input power of the RFQ cavity, the optimized "working point" of the RFQ was190kW that was demonstrated by the accelerated ion beam experimental results. |
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