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A low-energy, compact and superconducting electron beam ion trap (theShanghai-Wuhan EBIT or SW-EBIT) for extraction of highly charged ions ispresented. The magnetic field in the central drift tube of the SW-EBIT isapproximately 0.21 T produced by a pair of high-temperature superconductingcoils. The electron-beam energy of the SW-EBIT is in the range of 30-4000 eV,and the maximum electron-beam current is up to 9 mA. Acting as a source ofhighly charged ions, the ion-beam optics for extraction is integrated,including an ion extractor and an einzel lens. A Wien filter is then used tomeasure the charge-state distribution of the extracted ions. In this work, thetungsten ions below the charge state of 15 have been produced, extracted, andanalyzed. The charge-state distributions and spectra in the range of 530-580 nmof tungsten ions have been measured simultaneously with the electron-beamenergy of 279 eV and 300 eV, which preliminarily indicates that the 549.9 nmline comes from $W^{14+}$.

A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions