Speaker: Chihiro Ohmori
Abstract: The talk will sketch the theoretical basis for the properties of the MA cores, their properties and applications in synchrotrons around the world, and recent MA cavity installations and achievements.
Categories
FFA'20
International Workshop on Fixed Field alternating gradient Accelerators
5 replies on “Magnetic Alloy Cores for RF Resonant Cavity”
My experience in annealing of semi-metals PbHg(1-x)Te(x) implanted by Sb+ was that the implanted Antimony atoms take place in vacancies during the annealing process. This can be studied by X-ray spectroscopy. What is your explanation for improvements of the ferrites tapes due to annealing? Did you study the X-ray spectroscopy before and after annealing to see the difference inside of the nano-grains of the material?
Dejan Trbojevic
The material which we are using for J-PARC and CERN BSB, PS damper, LEIR, AD and ELENA is metal. It consists of Fe, Si, Cu, B and Nb. This is not ferrite. I compared 3 materials: ferrites, amorphous, and nano-crystalline materials in the first section. These materials are used for RF cavities. The key to improve the characteristics of nano-crystalline materials is the control of easy-magnetized axis of nano-crystals. When
nano-crystals are formed by annealing, applying magnetic field, the axis can be controlled.
Chihiro, thank you for the nice slides. Congratulations that MA cavities have been adopted in so many places and applications.
I have questions about slide #8.
What is the source of the eddy currents?
How does the RF electromagnetic field penetrate into the metal?
Best wishes
Shane
About the X-ray spectroscopy, XRD analysis are applied before and after. It clearly shows bcc-Fe are formed.
Dear Shane, Thank you. I think I answered your question in Q&A session. I hope we can collaborate near future.