ILSFUM'18: 10th ILSF Users' Meeting

Design and construction of 126 MHZ capacity loaded protyoe RF cavity

Not scheduled

20m

Poster Presentation

Speaker

Mr Sasan Ahmadiannamin (Iranian Light Source Facility)

Description

The Iranian Light Source Project (ILSF) is a 3rd generation light source containing a 3 GeV storage ring with 0.27nm.rad emittance, a full energy booster injector and a 150 MeV linac as pre-injector. The stored beam current of 100mA at commissioning phase will gradually increase up to 400mA in top up mode at final phase of operation. After a thorough study of the RF frequency effects on the beam and machine parameters and also cost estimation and feasibility study of RF components realization, 100MHz RF frequency was chosen for ILSF. Capacity loaded cavities based on MAX Lab Design will be used at the booster and storage ring. Three RF stations with maximum power of 25kW will be required for powering 3 booster cavities while 5, 60 kW stations are required in the storage ring for ILSF initial phase of operation with 7 beamlines and 100mA beam current. At final phase of operation when the storage ring is equipped with 17 beam lines and the beam current reached 400mA, one more station will be added in the storage ring and the power of all 6 stations will increase to 120kW. A modular design of RF amplifiers with units of 30kW provides desirable uniformity, extendibility and reliability to the system. Local companies with the experience in fabrication of high power FM transmitters are recognized as potential suppliers. To check the ability of local industry in cavity fabrication, the electromagnetic and mechanical design of a 100MHz cavity based on MAX Lab design has been performed. Fabrication of a copper cavity prototype is planned in order to conclude the possibility of the cavity development in house. Prior to that prototype, a 500MHz Aluminium pillbox cavity available at RF laboratory has been modified to a capacity loaded structure by adding a mushroom section. By optimizing the mushroom part dimension, the resonant frequency of 126MHz has been achieved for this Aluminium prototype with the available cylinder. Having similar characteristics with the main cavity, this prototype will be helpful for cross checking the simulation and measurement results and better understanding of the structure. In this paper the RF simulation and measurement results of this cavity are represented.