Place: Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
Duration: 2.5 + 2.5 days
Maximum participants: (4 + 4)
The participants will gain practical knowledge about the metal ion beam production using MIVOC method and about visible light spectroscopy of highly charged plasma. It will be also demonstrated how to detect electron cyclotron instabilities that often limit the performance of ECR ion sources. The hands-on-training in order to get familiar with the MIVOC method covers the safety issues, loading and handling of the MIVOC chamber, material feeding into ECR ion source and its operation. In the case of plasma diagnostics the visible light spectroscopy will be used to identify most intensive signals emitted by highly charged ions. The effect of optical filters will be demonstrated as well.
Operation of diagnostics techniques, namely microwave-‐sensitive diode and bremsstrahlung power flux detector, of plasma instabilities will be introduced as well. The objective is that after training the participant is able to bring the MIVOC method into use in his/her home laboratory and the participant understands limitations and also possibilities of the method. After training he/she also understands the basics of visible light spectroscopy, its possibilities and limitations in the case of highly charged plasmas and recognizes the symptoms of plasma instabilities.
Plan of activities
The participants will be divided into two groups. The other group will start the hands-on-training with the MIVOC method and the other with visible light diagnostics. Two days will be allocated for both trainings. At the end of each trainings the participants will prepare a short training report.
MIVOC method: During the first day a short introduction to the parameters affecting the gas flow rate from the MIVOC chamber to the ion source plasma will be given first. This flow rate has to be at least as high as the material consumption rate of ECRIS being typically 0.1-5 mg/h and depends on the intensity requirement. Information about the risk and safety phrases will be given in order to evaluate the safety risks of personnel and to guide them to proper handling of chemicals. Some examples and simple studies will be given to elevate the awareness of safety issues. As a next step the participant prepares (=loads) a MIVOC chamber in order to produce Fe ion beams and then connects it to the ion source. During the second day the ECRIS will be tuned for the production of highly charged Fe ion beams.
Visible light spectroscopy and detection of plasma instabilities: During the first day a short introduction to the light emission of atoms and ions and plasma instabilities as well as their diagnostics will be given. Then the participant will be trained for the use of atomic database in order to analyse the atomic emission spectrum. Then he/she defines (lists) the strongest signals of visible light emission of the given atom. As a next step, the participant will be trained for setting up the diagnostics and to measure the spectrum. In this experimental part the effect of different ECRIS operation conditions on the visible light emission will be studied briefly. At the end the participant analysis the measured spectrum and identifies signals originating from different ions. Discussion about the results and preparation of short a report. During the second the participant will be trained to set up a detection system for plasma microwave emission, instability-‐induced bursts of hot electrons generating wall bremsstrahlung and beam current oscillations. The effect of various ECRIS tuning parameters on the occurrence of the instabilities will be demonstrated. Discussion about the results and completion of a short report.
Report on plasma diagnostics: JYFL_Hands-on-training_Optical_emission_spectroscopy.pdf
Report on MIVOC method: Report_hands-on training at JYFL_MIVOC method.pdf