The injection of the electron beam into the ECR (Electron Cyclotron Resonance)plasma by electron gun is a new method for the additional supplementary of the plasma electron, following the aluminum chamber wall and the bias plate, we are expecting for the higher current and charge state of the ion beam with it. However, because of the controllable parameter's variety, the lack of the accumulation of experience and data, and the shortage of convenience in designing and experimental practicing compared by biased disk and other means,it has always not been intensively studied. In this article, we take the 18 GHz ECR Ion Source using evaporative cooling technique as experimental platform, do the experiment of injecting electron into ECR plasma base on the simulation result of the electron beam's path in ECR's chamber by the 3D simulation software CST the particle studio. It shows that a pulsing leap of the current of the extracting ion beam appears when the injecting electron's energy is above 1800 eV. In the mean time, the top of the pulse and the average current of the ion beam rises, the ionization state moves to a higher level. This phenomenon can be turned on and off by controlling the experimental condition. At the last part of the article, we discuss this improvement of the current and charge state of the ion beam despite of the position's missing between the injection of electron beam and the resonance surface, and hold the opinion that this phenomenon is positive to both pulsed and direct beam.

For high charge state electron cyclotron resonance ion source(ECRIS) magnet, generally, the power density is higher, and it generates a lot of heat. The efficient cooling of magnet coils is one of the key technologies which control the further improvement of high charge state ECRIS, and there are many researches aimed at cooling technology of magnet coils. This paper introduces the development work of high charge state ECRIS-LECR4 based on the evaporative cooling technology, which is the fourth generation ECRIS in institute of modern physics(IMP), Chinese Academy of Sciences. The disc unit structure is used in the magnet coils, and vertical cooling channels are arranged between coil units. The liquid coolant in channels absorbs the heat of coils, and evaporates into steam. This steam coolant automatically flows upward and into condenser, and condenses into liquid. Based on the phase change of coolant, the self-circulating evaporative cooling thermodynamic cycle is built, which realizes the heat transmission of magnet coils. The system tests of LECR4 ion source were completed after the manufacture. The test results show that magnetic coils can ensure secure and stable operation about 60℃under rated load, and the magnetic field parameters have reached the design requirements.

The control of the superconducting magnet power supply (SMPS) is very important for Super-conducting Electron Cyclotron Resonance Ion source with Advanced design in Lanzhou(SECRAL). In order to improve the safety and the reliability of the SMPS, a remote control system was designed and implemented. There are four power supplies needed to be controlled with suitable strategy to avoid the quench of the su-perconducting magnet. These four power supplies are used to supply four superconducting solenoids. Because the value and the changing rates of the current for these four solenoids are different, the power supplies must be operated synchronously to keep the current of the solenoids balanced. In this paper, we provide a detailed description for the control strategy of the four power supplies and the architecture of the hardware and the software. A serial switch is used for protocol conversion between TCP/IP and RS232 in firmware. And the software is implemented using VC++. The system can operate the four power supplies automatically after it is triggered. With the help of the control system, operation of the SMPS gets easier and safer.

The effects of ion types, temperature and scale size on the barium sulfate scale elimination were investigated by means of applying ionic liquids with different properties to descale barium sulfate scale. The results show that the ionic liquid (CH2CH3)3NHAl2Cl7 has a better dissolvability and a higher dissolving rate for the barium sulfate scale, which is enhanced greatly with the increase in the temperature and the decrease in the scale size(when the temperature increases from 60 ℃ to 70 ℃ and the size of the scale decreases from 600~1 000 μm to 100~200 μm, then the descaling rate increases from 5.00% to 31.6%). The types of cation and anion in the ionic liquid affect the scale elimination greatly. The dissolving effect of hydrophilic ionic liquid (CH2CH3)3NHAl2Cl7 with higher nonpolarity is much greater than that of the hydrophobic ionic liquid [BMIM]PF6 with higher polarity(under the same condition, the descaling rate of (CH2CH3)3NHAl2Cl7 is 22.45%, but the descaling rate of [BMIM]PF6 is only 0.47%). Meanwhile the descaling effect of ionic liquid (CH2CH3)3NHAl2Cl7 for barium sulfate scale is more obvious than that for the calcium carbonate scale.

A compact proton beam source for space simulation has been developed. A compact structure was designed in order to meet the special requirements of miniaturization. Some particular means have been adopted for improving the proton portion and beam transmission at a long distance. The experimental results showed that 8mA/80keV proton beam can be successfully obtained from this source at about 700W input microwave power.

The Lanzhou All Permanent magnet ECR ion source NO. 1 (LAPECR1) is the first all permanent magnet multiple ECRIS made in IMP. This ECRIS is running at 14.5GHz and can provide intense low charge state ion beams (varying from several to hundreds of e mu A) or medium charge state ion beams (varying from several to tens of e mu A). The size of source body is circle divide 102mmx296mm, the compactness and economical features enable the source suitable to be put on a HV platform or equipped by a small laboratory. This article gives the main parameters of the ion source.

Since 1998,many experiments for metallic ion production have been done on LECR2（Lanzhou ECR ion source NO.2）,LECR3（Lanzhou ECR ion source NO.3）and SECRAL（Superconductiong ECB ion source Advanced design in Lanzhou）at Institute of Modern Physics.The very heavy metallic ion beams such as those of uranium were also produced by the plasma sputtering method,and supplied for HIRFL（Heavy Ion Research Facility in Lanzhou）accelerators successfully.During the test,11.SeμAU 28+ ,9eμAU 24+ were obtained.Some ion beams of the metal having lower melting temperature such as Ni and Mg ion beams were produced by oven method on LECR3 too.The consumption rate was controlled to be lower for 26 Mg ion beams production,and the minimum consumption was about 0.3mg per hour.In this paper,the main experimental results are given.Some discussions are made for some experimental phenomena and results,and some conclusions are drawn.

A Superconducting ECR ion source with Advanced design in Lanzhou （SECRAL） was successfully built to produce intense beams of highly charged ions for Heavy Ion Research Facility in Lanzhou （HIRFL）.The ion source has been optimized to be operated at 28GHz for its maximum performance.The superconducting magnet confinement configuration of the ion source consists of three axial solenoid coils and six sextupole coils with a cold iron structure as field booster and clamping.For 28GHz operation,the magnet assembly can produce peak mirror fields on axis 3.6T at injection,2.2T at extraction and a radial sextupole field of 2.0T at plasma chamber wall.A unique feature of SECRAL is that the three axial solenoid coils are located inside of the sextupole bore in order to reduce the interaction forces between the sextupole coils and the solenoid coils. During the ongoing commissioning phase at 18GHz with a stainless steel chamber,tests with various gases and some metals have been conducted with microwave power less than 3.2kW and it turned out the performance is very promising.Some record ion beam intensities have been produced,for instance,810eμA of O 7+ ,505eμA of Xe 20+ ,306eμA of Xe 27+ ,21eμA of Xe 34+ ,2.4eμA of Xe 38+ and so on.To reach better results for highly charged ion beams,further modifications such as an aluminium chamber with better cooling,higher microwave power and a movable extraction system will be done,and also emittance measurements are being prepared.

<正>In order to make the controlling system for ECR ion source more intelligent,some new plans were carried out in early 2006.A controlling system based on Labview 8.0 contains three parts:an industrial computer,PCI data acquisition cards and Labview 8.0 software.Up to now,two systems has been tested preliminarily.One is the controlling system for the measurement of ion beam emittance,and the other is the ECR ion source controlling and analyzing system.Fig.1 shows the program interface written with Lab-

In CSRe electron cooling device, a special electron gun which can produce variable profile electron beam with different size and density distribution was adopted for decreasing ion losses. Electrostatic bending device was used for reducing electron beam losses and improving vacuum condition. The instability of the electron beam is suppressed because the secondary electrons from collector would come back to the collector in the same orbit finally. Longitudinal magnetic field with parallelism better than 10~(-4) was (achieved) by adopting of independent high precise solenoid coils at cooling section. In this case, the r.m.s deviations of the transverse magnetic field at cooling section in horizontal and vertical direction are 3.298×10~(-5) and 2.458×10~(-5) respectively. The characters of the gun and collector were investigated. The results were presented and indicate that it achieves the design purpose very well.