ETAII 6 MEV PEPPERPOT EMITTANCE MEASUREMENT

Paul, A C ; Richardson, R ; Weir, J

Lawrence Livermore National Laboratory

关键词: Beam Emittance;    43 Particle Accelerators;    Free Electron Lasers;    Brightness;    Accelerators;   

DOI  :  10.2172/15014819
RP-ID  :  UCRL-TR-207540
RP-ID  :  W-7405-ENG-48
RP-ID  :  15014819

美国|英语

来源: UNT Digital Library

【 摘 要 】

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 {var_epsilon}= 8.05 {plus_minus} 0. 53 cm - mr or a normalized emittance of {var_epsilon}{sub n} = 943 {plus_minus} 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 10{sup 8} A/(m - rad){sup 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.