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Chinese Physics C> 2007, Vol. 31> Issue(S1) : 192-195 

Ion Beam Extracted from a 14 GHz ECRIS of CAPRICE Type

  •  GSI, Darmstadt, Germany2 MSU-NSCL, Michigan, USA

  • An ion beam extracted from an ECRIS suffers from the inhomogeneous distribution of cold electrons within the minimum B configuration, necessary to confine the plasma. Especially for higher ion currents, the space charge force is not negligible any more, and because of the nonlinear force, emittance growth will occur.
    Measurements of the profile and the emittance of the beam directly behind the source show the complicated correlation between extraction voltage and plasma density. The emittance has been measured with a pepper pot device to account for the inhomogeneous azimuthal distribution of the beam. These results indicate that further information about the profile is required. To visualize the beam profile a tantalum foil with a thickness of 20μm has been used for an electrical beam power between 10 and 50W. Looking on the back side of the foil with a CCD camera it is possible to record the profile in real time. As a more sensitive diagnostic tool viewing targets made from BaF has been used.
    Three dimensional computer simulations have been used to identify the reason for the structures, observed in measurements.
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  • References

    [1] . Ciavola G et al. HEP NP, 2007, 31(Suppl.Ⅰ): 13(in Chinese)(Ciavola G 等.高能物理与核物理, 2007, 31(增刊Ⅰ): 13)2. Tinschert K et al. Experiments on Beam Extraction from the CAPRICE ECRIS, Berkeley, California, AIP Conference Proceedings, 2005, 7493. Spdtke P et al. Use of Simulations Based on Experimental Data, Berkeley, California; AIP Conference Proceedings,2005, 7494. Emittance measurement device, GSI-KVI collaboration

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P.Spadtke1, R.Lang1, J.Mader1, J.Robbach1, K.Tinschert1 and J.Stetson2. Ion Beam Extracted from a 14 GHz ECRIS of CAPRICE Type[J]. Chinese Physics C, 2007, 31(S1): 192-195.
P.Spadtke1, R.Lang1, J.Mader1, J.Robbach1, K.Tinschert1 and J.Stetson2. Ion Beam Extracted from a 14 GHz ECRIS of CAPRICE Type[J]. Chinese Physics C, 2007, 31(S1): 192-195. shu
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Received: 2007-05-30
Revised: 1900-01-01
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Ion Beam Extracted from a 14 GHz ECRIS of CAPRICE Type

  • GSI, Darmstadt, Germany2 MSU-NSCL, Michigan, USA
  • Received Date: 2007-05-30
  • Accepted Date: 1900-01-01
  • Available Online: 2007-01-03

Abstract: An ion beam extracted from an ECRIS suffers from the inhomogeneous distribution of cold electrons within the minimum B configuration, necessary to confine the plasma. Especially for higher ion currents, the space charge force is not negligible any more, and because of the nonlinear force, emittance growth will occur.
Measurements of the profile and the emittance of the beam directly behind the source show the complicated correlation between extraction voltage and plasma density. The emittance has been measured with a pepper pot device to account for the inhomogeneous azimuthal distribution of the beam. These results indicate that further information about the profile is required. To visualize the beam profile a tantalum foil with a thickness of 20μm has been used for an electrical beam power between 10 and 50W. Looking on the back side of the foil with a CCD camera it is possible to record the profile in real time. As a more sensitive diagnostic tool viewing targets made from BaF has been used.
Three dimensional computer simulations have been used to identify the reason for the structures, observed in measurements.

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