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    STUDIA PHYSICA - Issue no. 1 / 2005  
         
  Article:   LANGMUIR-PROBE STUDY OF THE HOT ELECTRON CYCLOTRON RESONANCE ION SOURCE PLASMA.

Authors:  L. KENÉZ, J. KARÁCSONY, A. DERZSI. 		 
       
         
  Abstract:  The electron cyclotron resonance (ECR) ion sources are high performance machines, which provide high intensity, highly charged ion beams. The most important part of these machines is the complex structure ECR plasma that is still not known properly. Local plasma diagnostic research was started in the ATOMKI-ECRIS laboratory. As a first step, the cold plasma regions have been studied. We showed that Langmuir-probes could be successfully used in certain conditions to get information on the cold plasma [1,2]. From the high performance point of view of the source much more important are the hot regions of the plasma. This paper deals with the exploration of these regions. Though energetic electrons are present in the ECR zone, we could measure probe characteristics without damaging the probe, at stabile operation conditions of the source. New shape of the voltage-current curves were observed, qualitative explanation of the curve shape was established assuming secondary electron emission of the probe. By computational study of the theoretical model the role of the secondary electron emission of the probe has been proved.  
         
     
         
         
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