1. IIFC Meeting February 24-25, 2015, RRCAT P. R. Hannurkar, Akhilesh Jain, M. R. Lad RF Systems Division 650 MHz RF Power 1

2. RF power amplifiers capable of supplying 30 and 60 kW of RF power at 650 MHz are required to power the elliptical SCRF cavities. Based on our experience of indigenous development of 505.8 MHz solid state RF amplifiers for Indus-2, development of 650 MHz amplifiers for proton accelerator program was taken up. Design and development work of basic RF power amplifier module and associated transmission line components has been carried out, based on FRS ( Dec 2010) received from Fermilab. Since the power available from single RF transistor is modest, RF power from several of these modules will be summed with suitable RF combiner to get 30 and 60 kW of RF power at 650 MHz. Development of Solid State RF Amplifier Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 2

3. 2009-10 2008 Solid State Amplifier at 352 MHz Power (P 1dB ): 4 kW CW Power Gain: 60 dB Solid State Amplifier at 505.8 MHz Power (P 1dB ): 2 kW CW Power Gain: 60 dB Journey Towards High Power… Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 3

4. Dec 2011March 2011 15 kW Solid State Amplifier at 505.8 MHz Journey Towards High Power 30 kW Solid State Amplifier at 505.8 MHz Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 4

5. Deployment of Solid State RF Amplifier in Indus-2 RF cavities #1, #2 and #3 are fed with 75 kW Amplifiers. Total installed RF power capacity of indigenously developed solid state RF amplifier is increased to 225 kW. One spare 75 kW amplifier ready for deployment, as per necessity. 75 kW Solid State RF amplifier – Jan 2013 Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 5

6. Distributed Data Acquisition and RF Protection For data acquisition of solid state amplifier, each high power unit form an independent system with its own local monitoring and data acquisition system built using FPGA controller and data I/O modules. An industrial PC, communicating using TCP/IP, shows necessary parameters in a graphical panel for user/operator. Front panel of each unit give access to necessary indicators and switches. Graphical panel Front panel Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 6

7. Digital Low Level RF (DLLRF) systems developed and deployed in all four RF stations. Phase and amplitude stability of ± 0.5  & ± 0.5 % respectively. DLLRF system uses Digital Signal Processing involving fast ADC and DAC, RF signal Processing CORDIC algorithm and FPGA based Fast Feedback Control Systems. Digital LLRF Control System for Indus-2 Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 7

8. Indus-2 RF Equipment Area Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 8

9. Proposed scheme for 30kW solid state amplifier - 30kW power will be obtained by summing output of two 15 kW units. Each 15 kW unit will be housed in a single euro rack with 40 amplifier modules, each one using LDMOS giving output RF power of 500 W. 30 kW RF Generator Driver 15 kW Units 30kW Amplifier Scheme + 15 kW Unit scheme used in 30kW Amplifier 1 39 40 Driver 500 W modules + RF Generator 20 21 + + 15 kW 1 2 Scheme for 650 MHz 30 kW RF Power Source Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 9

10. Design and development of 15 kW, 650 MHz solid state RF power amplifier is completed. The high power is obtained by using several 500 W basic RF power modules. It is housed in a single euro rack with 40 compact amplifier modules, 40 way power divider and 40 way power combiner. Progress – 650 MHz RF Power Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 10

11. Sr.ParameterValue 1Rated RF Power Output500 W 2Operating frequency and 1 dB Bandwidth 650 MHz, ± 5 MHz 3Power Output @ 1db Compression 500 W 4Power Gain17 dB 5Input and output Impedance 50  6Conversion Efficiency70 % 7Harmonic Distortion-30 dBc 8Spurious Output-35 dBc 9Input VSWR 1.1 10CoolingWater Cooled Design and simulation studies were done using Microwave Office. A push-pull 50 V LDMOS device was used. Mode of operation is “extended continuous class F”. Development of 500 W Amplifier module Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 11

12. Wide-Band Directional Couplers 2-way and 3-way Power combiners 1 kW4 kW 20 kW 40-way Power combiner Development of 650 MHz RF Components Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 12

13. Serial No. Item Name QuantityDelivery date 1 30 kW amplifier 1Jan 2016 2 30 kW amplifier 1Jan 2017 Items to be delivered under IIFC collaboration in Phase–II by RFSD These units will be integrated with HTS. Deliverables-650 MHz RF Power Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 13

14. Preliminary FRS (Dec 2010) available, It needs to be finalized. Required physical foot prints and layouts for 30 kW and 60 kW, 650 MHz RF amplifier units including circulator and transmission line components. Details of EMI/EMC standards, vibration and shock test, to be followed, and acceptance test criteria/ procedures to be followed. RF Interface, high power RF testing details, remote control interface need to be discussed with RF and control team of Fermi lab Specific requirement if any, regarding electronic components and subsystems used in fabrication of 60 kW and 30 kW RF power systems need to be supplied. Any restrictions of components and material, to be used in making the RF power systems, need to be provided. Quantity to be delivered towards Indian contribution of 60kW, 650 MHz and 30 kW, 650 MHz RF power systems. Discussions on Initial Inputs Raja Ramanna Centre for Advanced Technology IIFC Meet 24-25 Feb 2015 14