Indigenous development of ferrite circulator for RF system of accelerator at RRCAT

We have undertaken indigenous development of temperature stable high power ferrite circulators for RF System of Indus Accelerators and Proton linac at RRCAT Indore. The high power ferrite circulators at 476 MHz, 505 MHz and 650 MHz are being indigenously developed for RF system of IRFEL, Indus- 2 and Proton Linac. Ferrite circulator technology is advanced, complex, sophisticated and not available in. A lot of innovative R and D on ferrite and circulator have done in terms of both materials and devices at Ferrite Laboratory of Accelerator Magnet Technology Division. A 200 mm diameter disks in Calcium Vanadium garnet, Gadolinium Dy garnet and NiAl spinel ferrite compositions have been successfully indigenously developed and tested at 505.8 MHz and 650 MHz. An excellent magnetic stability w.r.t temp (up to 250 °C), narrow resonance line width (∼ 50 Oe) and large spin wave width (∼ 10 Oe) have been achieved. A ferrite/garnet disk (∼200 mm) resonator with composite magnetic circuit has been fabricated and characterized. A detailed indigenous large ferrite and garnet disk technology, power threshold of ferrite, technical challenges in circulator design and development, permanent magnetic circuits, current status and indigenous development strategies for high power ferrite circulators for future accelerators will be discussed in this paper