RF AND THERMO-MECHANICAL CONSIDERATIONS IN DESIGNING THE WAVEGUIDE IRIS COUPLER FOR THE DRIFT TUBE LINAC IN THE ORNL SPALLATION NEUTRON SOURCE
The Spallation Neutron Source (SNS) employs tapered ridge waveguide iris couplers to power six drift tube linac (DTL) cavity structures with pulsed RF systems using 2.5MW klystrons at 402.5MHz. All DTL iris couplers have been operating continuously for more than a decade without replacement. Transferring high RF energy to the cavities requires robust RF and mechanical performances with the power dissipation, electrical breakdown and vacuum pressure. Considering the upcoming full 1.4MW operation and the future proton power upgrade (PPU) project, the structural design and the material selection needed to be reviewed for potential spare manufacturing. The existing design and the modified design with improvements of the coupler have been numerically studied. For the study, 3D models were used for RF and structural characterizations of the waveguide iris couplers on the DTL cavity. RF and thermo-mechanical co-simulations were performed to assess the effects of using the different materials and the structural modification.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1436036
- Resource Relation:
- Conference: International Particle Accelerator Conference 2018 (IPAC18) - Vancouver, , Canada - 4/29/2018 8:00:00 AM-5/4/2018 8:00:00 AM
- Country of Publication:
- United States
- Language:
- English
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