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2. Operation of the SERSE superconducting electron cyclotron resonance ion source at 28 GHz
3. Development of the third generation electron cyclotron resonance ion source
4. Effect of magnetic-field configuration on the beam intensity from electron cyclotron resonance ion source and RIKEN superconducting electron cyclotron resonance ion source
5. Advanced superconducting electron cyclotron resonance ion source SECRAL: Design, construction, and the first test result