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The cylindrical geometry of the magnetic confinement of the MONO1001 electron cyclotron resonance (ECR) ion source made in GANIL [P. Jardin etal, Rev. Sci. Instrum. 73, 789 (2002)] allows us to measure radial characteristics of the working ECR plasma with helium gas. The physical and the geometrical characteristics of the resonance surface inside the working ECR source have been quantified with the help of a visible light spectrometer. Hence, we have deduced a shape of the electron cyclotron resonance ion sources resonance surface which corresponds closely to our magnetic calculations. © 2004 American Institute of Physics.