Mega-Watt planar coaxial Aluminum Nitride window for eRHIC
- Brookhaven National Lab. (BNL), Upton, NY (United States)
The Office of Nuclear Physics long range plans include allocation of resources to develop technology for a polarized electron-ion collider. This collider will support experimental and theoretical research to uncover the roadmap of matter. Presently RHIC is planned to continue experiments with heavy ion and polarized proton collisions through 2024. After that BNL plans a transition to eRHIC, an electron-ion collider (EIC). The transition from RHIC to eRHIC includes adding an electron accelerator to the existing RHIC ion complex. BNL plans for the electron accelerator are based on an electron injector linac, a Rapid Cycling Syncrotron and a storage ring. The electron storage ring design includes 12 SRF cryomodules made of 2-cell SRF cavities per cryomodule. Each cavity will be fed with 2-500 kW adjustable coaxial fundamental power couplers. Two couplers are used to divide the power and increase reliability of the RF windows. The favorable material properties of aluminum nitride, specifically its high thermal conductivity, low loss tangent, high dielectric strength, and good mechanical strength, make it an excellent candidate for an RF window. In Phase I TJS Technologies performed extensive analysis and developed a manufacturing design of a 650 kW coaxial window (with a center hole) using AlN as the window material. TJS Technologies analyzed different AlN window configurations within a coaxial coupler design for both 704 MHz and at the operating frequency of the electron ring SRF cavities. Manufacturing studies of these configurations were then evaluated for, ease of assembly, overall confidence of plating of RF surfaces, ease of brazing, etc. and led to the prototype design choice. Developing a coaxial RF window that can handle 500kW or greater of CW power will provide flexibility for the choice of RF window and power coupler type, ie. coax vs waveguide. A substantial improvement in performance and efficiency for electron-ion colliders such as eRHIC and future ERL’s will be realized. Superconducting cavities are limited more by the RF windows than by their fields. This window will enable higher power to the cavities and will provide a lower cavity count and lower costs for these devices.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- SC0019534
- OSTI ID:
- 1635104
- Type / Phase:
- SBIR (Phase I)
- Report Number(s):
- DOE-TJS-11111-2
- Country of Publication:
- United States
- Language:
- English
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