Lossy Beam Pipe HOM Load Ceramics with DC Conductivity
- Muons, Inc., Batavia, IL (United States)
The procurement of material for Beam Pipe HOM loads has been a long standing problem for three major reasons: 1) the manufacturers tend to be large companies with many customers without a material specifically designed for room temperature or super conducting accelerator beam pipes, 2) as a result, the processes for manufacturing their lossy ceramics are not designed for particle free repetitive consistency required in high quality accelerator components, and 3) the processing details required for DC conductivity to reduce charging effects and secondary electron emission are not an element of the original chemistry, but a by-product of their standard processes and thus not controlled as part of their design. A novel process for impregnation of the lossy ceramics with conductive nanoparticles has been utilized to form the surface conductivity required to eliminate charging of the ceramics at both room temperature and superconducting temperatures. Pore size and density of open pores generated in the lossy ceramic allow for the capillary flow of nanoparticles into the near surface of the bulk material. The surface is then sealed to prevent the loss of nanoparticles into the environment. Surface conductivity was investigated using several different types of nanoparticles and surface coatings. Surface conductivity was measured and SEM experiments performed to determine the level of surface charging. Ceramics were made and coated with nanoparticles and a sealant for RF measurements at room and cryogenic temperatures. Initial work on microwave sintering was done to evaluate applicability to creating the lossy ceramics. A means for developing carbon loading of ceramics for bulk loss and pore density will be extended beyond the Phase I work. Sintering time-temperature profiles using both conventional and microwave sintering processes will be extended beyond the Phase I work to produce load material suitable for high vacuum operation at cryogenic temperatures. Fully operational loads will be manufactured for JLAB RF systems.
- Research Organization:
- Muons, Inc., Batavia, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- SC0017237
- OSTI ID:
- 1498545
- Type / Phase:
- STTR (Phase I)
- Report Number(s):
- DOE-Muons-17237
- Country of Publication:
- United States
- Language:
- English
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