The DARHT Scattering Wire Spectrometer: Operation and Checkout on ETA II

Fessenden, T J

Lawrence Livermore National Laboratory

关键词: Spectrometers;    Magnetic Fields;    43 Particle Accelerators;    Bending;    Electrons;   

DOI  :  10.2172/875961
RP-ID  :  UCRL-TR-213410
RP-ID  :  W-7405-ENG-48
RP-ID  :  875961

美国|英语

来源: UNT Digital Library

【 摘 要 】

The DARHT Scattering wire energy spectrometer has been realized and checked out on ETA II. The ETA II beam energy is generally around 5.3 MeV. This value varies from pulse-to-pulse by around 0.5% and from month-to-month by as much as 6%. The energy acceptance of the spectrometer is {+-} 5% and the time response is less than 10 ns. The instrument was calibrated to enable absolute measurements of the ETA II beam energy accurate to {+-}3%. The beam energy in MeV is related to the bending magnetic field B{sub kG} according to E{sub MeV} = 0.511[{radical}(1+347.2B{sub kG}{sup 2}) -1]. The major difficulty encountered was in the development of detectors for the scattered electrons passing through the instrument. Fortunately one detector was fabricated that worked satisfactorily which enabled us to complete the tests on ETA II. The ETA II experiments and initial FXR experiments suggest that spurious X-ray signals will not prove troublesome. No results are yet available in the x-ray environment of DARHT.