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Place: Department of Physics, University of Jyväskylä, Jyväskylä, Finland.

Duration: 2.5 + 2.5 days

Maximum participants: (4 + 4)

Description

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.

Presentations

Diagnostics of ECRIS plasma instabilities, MIVOC method 

Introduction to emission spectroscopy

Introduction to emission spectroscopy - experimental setup

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

 

 

 

 

 

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