A quarter-wavelength coaxial cavity with a longitudinal radio-frequency power supply was fabricated and tested. The cavity was designed as a pre-buncher for a thermionic triode-type radio-frequency gun of a mid-infrared free electron laser facility. The triode structure was formed to ensure the reduction of the back-bombarding effect, which usually appears in thermionic radio-frequency guns. The coaxial cavity was tested using a tungsten dispenser cathode. From the results of the cold test, a cavity voltage of about 25 kV can be attained, which corresponds to designed characteristics. In contrast, the hot test showed a sudden drop in voltage, resulting in an unstable operation. The small dimensions of the cavity caused some low-field effects, which led to multipactoring. In this paper, we report the tested characteristics of the pre-bunching cavity.
ملخص البحث
قسم البحث
مجلة البحث
Jpn. J. Appl. Phys
المشارك في البحث
الناشر
IOP Publishing
تصنيف البحث
1
عدد البحث
56
موقع البحث
https://iopscience.iop.org/article/10.7567/JJAP.56.096701
سنة البحث
2017
صفحات البحث
096701