Paper | Title | Page |
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TUPP12 | Design of Web-based Interface to RIKEN 28 GHz Super-conducting ECR Ion Source and the Future Plan | 61 |
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A new RIKEN 28 GHz superconducting ECR ion source (28 GHz-ECRIS) was constructed in 2009 in order to increase the intensity of Uranium ion beam for RIKEN RI beam factory project(RIBF). For effective and stable operation of the 28 GHz-ECRIS, its client system should have an user-friendly man-machine interface. The ECRIS control system was constructed with the Experimental Physics and Industrial Control System (EPICS) as well as RIBF control system. As a result, it was successful to provide the useful clients, such as the operation GUI panels, the XY chart application, and the data acquisition system in EPICS-based system. On the other hand, to keep beam quality from 28 GHz-ECRIS for a long beam service term, it should be possible to operate the ECRIS by members of ion source team at any time. In order to relieve concern in the overseas business trip of members of ion source team, we designed a real-time web-based client system using WebSocket*, which is a new protocol presented by Internet Engineering Task Force (IETF). In this paper, we report the system and development status in detail.
* I. Fette and A. Melnikov. The WebSocket Protocol, IETF HyBi Working Group. 2011. |
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TUPP17 | Installation and Operation of a 28 GHz Gyrotron for the RIKEN Superconducting ECR Ion Source | 71 |
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The RIKEN 28-GHz ECRIS uses a gyrotron microwave source fabricated by Mitsubishi Electric Corporation. The maximum output power is 10 kW. The gyrotron produces TE02-mode microwaves, which are converted into the TE01 mode by a mode converter. In the first test on the gyrotron performed using a dummy load, we observed the 50-300 Hz ripples of ~500 W in the output power of 1-7 kW, and it was difficult to make a stable operation in the low-power. These ripples were reduced to one-tenth by stabilizing the cathode voltage and then the gyrotron could produce microwaves from < 0.5 kW stably. The operation of the ion source with the 28 GHz gyrotron was started in 2011 and the ion source supplied U and Xe beams to the RIBF for two months. The power of the microwaves fluctuated slowly in the range of 870-1250 W, which influenced the beam current from the ion source. This fluctuation was caused by a slight change of the current of the solenoid of the gyrotron depending on the room temperature. We replaced the power supply with new one which has a current stability of 10ppm per day, and stabilized the microwave power in the range of 5% in the operation of 2 kW successfully. | ||
WEZO02 | Design of new 18 GHz ECR for RIKEN RIBF | 114 |
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In RIKEN RIBF, we plan to install a new 18 GHz ECR ion source, which supply the intense beam of highly charged heavy ion beam into the linear accelerator RILAC. By equipping two ion sources, it is expected to be able to develop new beams while we produce the beam for the experiment of RIBF. Based on the structure of 18 GHz ECR ion source which have been developed in RIKEN, this ion source has additional features as follows:
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Slides WEZO02 [10.113 MB] | |
WEPP08 | Emittance Measurements for U Ion Beams Produced from RIKEN 28 GHz SC-ECRIS | 130 |
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In order to investigate the ion optical parameters of the beam line of RIKEN 28 GHz SC-ECR ion source into the new heavy ion linac (RILAC II), we measured the emittance of the heavy ion beams form RIKEN 28 GHz SC-ECR ion source. In the test experiments, we observed that the emittance of the U35+ beam was ~100 π·mm·mrad (4 rms emittance), which is smaller than the acceptance of the accelerator (~160 π·mm·mrad). The emittance with 28 GHz was almost same as that with 18 GHz and independent on the injected RF power (1~2 kW). The size of emittance increased with decreasing the charge state. We also measured the emittance of U and oxygen ions under the same condition. In this experiment we observed that the emittance of oxygen ions was always larger than the U ion beam for same M/q. In this contribution, we report the experimental results for emittance measurement of highly charged U, Xe and O ions from RIKEN 28 GHz SC-ECR ion source in detail. | ||