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Injector Microtrone, Booster and Indus-1 SRS RF Systems |
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Indus Synchrotron Radiation Source (SRS) facility operational at RRCAT consists of 20 MeV injector Microtron, 550 MeV Booster synchrotron,450 MeV Storage Ring Indus-1 and 2.5 GeV Storage Ring Indus-2. The role of RF system is to provide energy to accelerate the beam from injection to final energy and also to compensate for Synchrotron Radiation losses suffered by circulating electrons through the bending magnets.
a) 5 MW pulsed S-band Microwave system for 20 MeV injector Microtrone
A new 5 MW peak power, S-band microwave system based on ‘solid state modulator’ technology expected to provide better pulse stability and higher component life time was developed ,installed and tested for more than 4 MW RF peak power at 2856 MHz. |
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Fig.1 Solid state modulator and Klystron |
RF power amplifier module.Indus-1 is being regularly operated at 450 MeV/125 mA with this amplifier in round the clock shift operation. Low level RF control system consists of synthesized signal generator, 0-360˚ phase shifter, feedback control loops (amplitude, phase & PLC based resonance tuning) and coaxial RF switch. Amplitude and phase control feedback loops are incorporated to maintain the amplitude and phase of the cavity gap voltage within 1% and 1˚ respectively for proper operation of the machine.
b) 31.6 MHz Solid State RF Amplifier and Low-level RF System
31.6 MHz high power RF amplifiers of Booster Synchrotron and Indus1 RF Systems were earlier designed using vacuum tube devices. Due to non-availability of Vacuum tetrode tubes, 1kW Solid State RF Power amplifier for 550 MeV Booster Synchrotron and 2kW Solid State RF Power amplifier for 450 MeV Indus-1 storage ring were developed, tested and commissioned in March 2010 and March 2012 respectively. Since their inception both the systems are running successfully with better performance and having less down time. The basic building block in both the amplifier systems is MRF 141 G MOSFET based 300 watts
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Fig. 2 : 31.6 MHz Solid State RF amplifier installed in Indus-1 and Booster Synchrotron |
RF power amplifier module.Indus-1 is being regularly operated at 450 MeV/125 mA with this amplifier in round the clock shift operation. Low level RF control system consists of synthesized signal generator, 0-360˚ phase shifter, feedback control loops (amplitude, phase & PLC based resonance tuning) and coaxial RF switch. Amplitude and phase control feedback loops are incorporated to maintain the amplitude and phase of the cavity gap voltage within 1% and 1˚ respectively for proper operation of the machine.
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