Diagnostics for a 1.2 kA, 1 MeV electron induction injector
We are constructing a 1.2-kA, 1-MeV, electron induction injector as part of the RTA program, a collaborative effort between LLNL and LBNL to develop relativistic klystrons for Two-Beam Accelerator applications. The RTA injector will also be used in the development of a high-gradient, low-emittance, electron source and beam diagnostics for the second axis of the Dual Axis Radiographic Hydrodynamic Test (DARHT) Facility. The electron source will be a 3.5``-diameter, thermionic, flat-surface, m-type cathode with a maximum shroud field stress of approximately 165 kV/cm. Additional design parameters for the injector include a pulse length of over 150-ns flat top (1% energy variation), and a normalized edge emittance of less than 200 {pi}-mm-mr. Precise measurement of the beam parameters is required so that performance of the RTA injector can be confidently scaled to the 4-kA, 3-MeV, and 2-microsecond pulse parameters of the DARHT injector. Planned diagnostics include an isolated cathode with resistive divider for direct measurement of current emission, resistive wall and magnetic probe current monitors for measuring beam current and centroid position, capacitive probes for measuring A-K gap voltage, an energy spectrometer, and a pepper-pot emittance diagnostic. Details of the injector, beam line, and diagnostics are presented.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48; AC03-76SF00098
- OSTI ID:
- 293532
- Report Number(s):
- UCRL-JC-129988; CONF-980573-; ON: DE98056040; BR: 39DP01000; TRN: 99:000117
- Resource Relation:
- Conference: 8. beam instrumentation workshop (BIW-98), Stanford, CA (United States), 4-7 May 1998; Other Information: PBD: 11 May 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diagnostics for a 1.2 kA, 1 MeV, electron induction injector
Progress on the relativistic klystron two-beam accelerator prototype