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AbstractAbstract
[en] We measured the beam emittance at the ETAII accelerator using a pepper-pot diagnostic at nominal parameters of 6 MeV and 2000 Amperes. During the coarse of these experiments, a ''new tune'' was introduced which significantly improved the beam quality. The source of a background pedestal was investigated and eliminated. The measured ''new tune'' emittance is (varepsilon)= 8.05 (plusminus) 0. 53 cm - mr or a normalized emittance of (varepsilon)n = 943 (plusminus) 63 mm - mr In 1990 the ETAII programmatic emphasis was on free electron lasers and the paramount parameter was whole beam brightness. The published brightness for ETAII after its first major rebuild was J = 1 - 3 x 108 A/(m - rad)2 at a current and energy of 1000-1400 Amperes and 2.5 MeV. The average normalized emittance derived from table 2 of that report is 864 mm-mr corresponding to a real emittance of 14.8 cm-mr
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18 Oct 2004; 32 p; W-7405-ENG-48; Available from http://www.llnl.gov/tid/lof/documents/pdf/312944.pdf; PURL: https://www.osti.gov/servlets/purl/15014819-CXnYIA/native/; PDF-FILE: 32 ; SIZE: 1.2 MBYTES
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