325 MHz solid state RF amplifier development at BARC under IIFC - - PowerPoint PPT Presentation

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325 mhz solid state rf amplifier development at barc
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325 MHz solid state RF amplifier development at BARC under IIFC - - PowerPoint PPT Presentation

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325 MHz solid state RF amplifier development at BARC under IIFC Manjiri Pande and Team RFSS, IADD BARC Outline 1. RF devices 2. Solid State RF Amplifier topology 3. 3. Solid State RF Amplifier (@ 325 MHz) development under IIFC Solid

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SLIDE 1

325 MHz solid state RF amplifier development at BARC under IIFC

Manjiri Pande and Team RFSS, IADD BARC

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SLIDE 2

Outline

1. RF devices 2. Solid State RF Amplifier topology 3. Solid State RF Amplifier (@ 325 MHz) development under IIFC 3. Solid State RF Amplifier (@ 325 MHz) development under IIFC 4. Schedule

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 3

Available RF Technologies

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 4

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February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 5

Solid State RF Amplifiers

The advantages of solid state amplifier No High Voltage and Vacuum requirement No filament, no warm up time and simple start up procedures High Reliability Modular Design Graceful Degradation Easy and Fast Maintenance Better RF signal (Harmonics, Phase Noise etc.) Overall moderate Cost Overall moderate Cost Expected decrease in Price/Watt and Size/Watt due to world-wide R&D efforts Solid State RF Power Amplifier Development at 325 MHz Solid State RF Power Amplifier Development at 325 MHz MOSFET based RF power modules Input RF power is divided into ‘n’ parts (1:n) ‘n’ no. of individual RF modules amplifies the power The output power from these ‘n’ modules is combined (n:1) to get higher power The high efficiency RF amplifier modules of 1 kW have been developed Technology of Power Dividers Combiners (PDC) at various power levels

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 6

Solid State Amplifier: The basic Building blocks

Output RF power of individual solid state device is medium, maximum up to 1200

  • Watts. Hence higher power level of the order of few kW level can be obtained by

summing output of multiple power modules using power combiners. Different constituent blocks which need to be developed separately, are as shown Output RF power of individual solid state device is medium, maximum up to 1200

  • Watts. Hence higher power level of the order of few kW level can be obtained by

summing output of multiple power modules using power combiners. Different constituent blocks which need to be developed separately, are as shown

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February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 7

Architecture of SSRFPA

r splitter combiner

PA PA n Directional coupler n

Control Signal

RF Load

The variation in phase and amplitude

  • f amplifier modules

demands for proper summation at combiners that leads to good combining efficiency.

Due to divide and combine strategy, the design of each part is equally important

n

RF signal Driver

Power spl power com

PA 1 PA coupler 1

Compact DC supplies Interlock and Protection Water cooling

RF Switch

Load 1

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 8
  • Deliverables under the collaboration and under Addendum V

1 1 kW, 325 MHz, solid state power amplifier (SSPA) – Completed

Indian Institute and Fermi Lab Collaboration (IIFC Indian Institute and Fermi Lab Collaboration (IIFC) )

1 kW, 325 MHz, solid state power amplifier (SSPA) – Completed 3 kW, 325 MHz, solid state power amplifier (SSPA) – Completed and delivered 7 kW, 325 MHz, solid state power amplifier (SSPA) – Bench tested W, 325 MHz, solid state power amplifier (SSPA) – Bench tested.

  • In the next phase, 30 numbers of 10 kW, 325 MHz, solid state power amplifier

(SSPA) need to be developed under IIFC Status: Design completed

February 27, 2015

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IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 9

Our aim was and is, to design and develop 1) the high efficiency (RF) power modules 2) Power dividers / combiners (PDC) with good matching 3) Directional couplers for RF power measurement and and 1) Use compact DC supplies 2) Use reliable interlock and protection for safe operation of RFPA 3) Achieve excellent efficiency and power gain of the amplifier Started with technology development of the most important basic building blocks of

R &D done for RF power modules and power dividers/ combiners R &D done for RF power modules and power dividers/ combiners

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Started with technology development of the most important basic building blocks of SSPA, i.e. 1) High efficiency RF amplifier power modules (1 kW) and 2) Power combiner /divider technology at various power levels A 325 MHz, 1 kW - Amplifier module was designed. Substantial investigation was done using different laminates based on their properties like dielectric strength, thermal conductivity etc. During development period, modules were developed using three types of printed circuit boards (pcb) material (laminates) as, a) FR4 b) Ceramic filled PTFE c) Glass microfiber reinforced PTFE

February 27, 2015 IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 10

Main Specifications Fermi Lab specs FR4 (BARC) Glass microfiber reinforced PTFE (BARC) Ceramic filled PTFE (BARC)

Center frequency (MHz) 325 325 325 325 Power output (W) (single module) 1000 1000 (short term) 800 (long term) 1000 (short term) >1000 Power Gain (dB) (Overall) 60 >60 ( individual module19.3) > 60 ( individual module: 21.8) > 60 ( individual module: 22.8)

Comparison of Specifications

module19.3) 21.8) module: 22.8) Efficiency(AC/RF) (%) (module) > 60 < 60% 62 > 63 Issues if any Thermal issue Thermal issue No issues Status Discontinued Discontinued Adopted for 1, 3, 7 and 10 kW amplifiers Thermal/Heat transfer efficiency

  • Poor

Good

  • V. Good

February 27, 2015 IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 11

R&D and development RF Power Amplifier Modules

Center Frequency : 350, 352 , 325 MHz Power output (sat.) : 100 W, 300 W, 800 W, 1000W Power Gain : 8.5-20 dB

The PA PA module module is the main building building block

  • block. It determines the

system linearity, efficiency and power consumption. Its design at high power, involves study of issues like RF transistor selection, device model, device efficiency, operating modes and device parasitic effect.

Power Gain : 8.5-20 dB Efficiency : 50 - 68% Protection : Circulator

Circulator Device O/p Balun Load I/p Balun

O/P I/P

250W Amplifier module

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 12

R&D and development RF Power Amplifier Modules

300W Amplifier module at 352 MHz

1kW Amplifier module at 325 MHz 800W Amplifier module on FR4 laminate

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 13

R&D and development of Power Dividers /Combiners

  • Combiners designed using pcb and coaxial lines.
  • 2, 4, 8-way combiners
  • Power levels 100 W, 1 kW, 10 kW.
  • Return loss of >20dB at input ports (with phase coherence)
  • Return loss of better than 25dB at output port.
  • Isolation among input ports better than 25dB.
  • Transmission loss < 0.15dB

2-way splitter 2-way combiner 4- way pcb based Combiner/splitter 4- way, 3 kW coaxial Combiner/splitter

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 14

Power Dividers /Combiners - - continued

8 way, pcb based Combiner/splitter 10 kW, 2-way, coaxial Combiner/splitter

5 kW, 8 way, coaxial Combiner/splitter @ 352 MHz 4 kW, 8 way, coaxial Combiner/splitter

Combiner/splitter

8 kW, 8 way, coaxial Combiner/splitter @ 325 MHz

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 15

Directional Coupler: Design and development

Directional coupler 1 kW at 325 MHz Directional coupler 500 Watt at 325 MHz Simulated directional coupler 3 kW at 325 MHz

Manjiri/IADD/BARC/V- IIFC meet

Watt at 325 MHz Directional coupler 3 kW @ 325 MHz with BW of 30 MHz

Parameters Results with low RF signal (dB) Isolation

  • 72

Coupling

  • 44.4

Directivity 27.6

February 27, 2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 16

All are stand alone RF amplifiers and are designed and developed indigenously

Contribution under IIFC: Solid State RF amplifiers at 325 MHz

  • Power: 3 kW
  • Overall Gain: > 65 dB
  • Efficiency : 65 %
  • 2nd Harmonics: - 41.9 dB
  • Power: 1 kW
  • Overall Gain: > 65dB
  • Efficiency : 61 %
  • 2nd Harmonics: - 41.5 dB

1 kW Amplifier 3 kW Amplifier 7 kW Amplifier

  • Power: 7 kW
  • Overall Gain: > 90 dB
  • Efficiency : 66.3 %
  • 2nd Harmonics: -41.9 dB

February 27, 2015

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IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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This 3 kW @ 325 MHz work has been published in: Journal: Nuclear Instruments and Methods in Physics Research A 735(2014) 283–290 Title: Development of 3kW, 325MHz solid-state RF power amplifier using four power amplifier modules Authors: B.V. Ramarao , S Sonal, J. K. Mishra , M. Pande, P. Singh, G Kumar,

  • J. Mukherji

February 27, 2015 IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 18

7 kW, 325 MHz SSRFPA

Power Meter Power Meter

200 W

  • Sig. Generator

10 kW Load

Power Meter

DC 50V, 30A each (8) Water cooling

8:1 Combiner 1:8 Divider

200 W

1-5/8” line NRT-Z44 NRT-Z44 50 W SSPA

Feb 27,2015

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 19

7 kW, 325 MHz RF amplifier

Feb 27, 2015

Assembled and tested unit of 7 kW SSRFPA Interlock card under development

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 20

7 kW, 325 MHz SSRFPA

RF Power Waveform at 7 kW on spectrum analyzer Display of Calorimetric measurement of RF Power Sensor data of Calorimetric measurement of RF Power

IIFC meeting- 325 MHz RF- manjiri - IADD-BARC

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SLIDE 21

7 kW, 325 MHz RF Power Amplifier

  • The amplifier sub-systems (i.e. amplifier modules, DC power supplies,

combiner etc.) have been assembled in the stand alone amplifier rack

  • Testing at 7.5 kW RFPA has been completed
  • Evaluation of the amplifier is completed

Results of testing

i. Power rating: 7.5 kW at 325 MHz ii. Bandwidth: > +/-5 MHz (1 dB) iii. Power Gain: 21.6 dB iv. Overall conversion efficiency: 66.3% v. Compression power (at 1 dB): 7.3 kW vi. Harmonic contents: < -50 dBc vii. Radiated emission measured outside unit: 3.1 V/m

Feb 27, 2015

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IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

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SLIDE 22

Evaluation of SSRFPA

Feb 27, 2015

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parameters Pin (W) Power (kW) Gain (dB) Efficiency (%) 2nd Harmonics 3nd Harmonics VSWR- in 1 63.4 8.1 21.0 68.3

  • 47.6 dBc
  • 66 dBc

1.25 2 53.7 7.6 21.5 67.6

  • 48.7 dBc
  • 66 dBc

1.18 3 38.5 6.4 22.2 64.4

  • 49.8 dBc
  • 67 dBc

1.06

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

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SLIDE 23

Evaluation of SSRFPA

Feb 27, 2015

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

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SLIDE 24

This 7 kW @ 325 MHZ work has been published in,

Journal: Nuclear Instruments and Methods in Physics Research A 764 (2014) 247–256 Title: A compact high efficiency 8kW, 325 MHz power amplifier for accelerator applications Authors: Jitendra Kumar Mishra , B.V. Ramarao, Manjiri Pande, P. Singh

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

Feb 27, 2015

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SLIDE 25

10 kW, 325 MHz SSRF power amplifier

  • Design of the 10 kW amplifier has been completed based
  • n the FRS for 7 kW RFPA
  • 1 kW amplifier module for this amplifier is same as that

used in 7 kW amplifier. Main component procurement and fabrication work has

  • Main component procurement and fabrication work has

started for first prototype unit

  • Design may get modified based on detail information to be

received from FNAL

Feb 27, 2015

IIFC- 325 MHz RF--meeting- manjiri - IADD-BARC

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SLIDE 26

Information Required from FNAL for 10 kW RFPA

  • The

functional requirement specification (FRS) and technical requirement specification (TRS) document to be received from Fermi lab. Details of vibration and shock test, overall dimensions, system layout and remote Interfacing etc. need to be discussed and finalized

  • RF Interface, high power RF testing details for SRF cavity and remote control

interface format need to be provided by Fermi lab, detailed discussion with RF and control team of Fermi lab to be carried out

Feb 27, 2015

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  • Required physical foot prints and layouts for 10 kW, 325 MHz RF amplifier units

including circulator and transmission line components

  • Details of EMI/EMC standards, to be followed and acceptance test criteria/

procedures to be followed

  • Specific requirement if any, regarding electronic components and subsystems used

in fabrication of 10 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 mentioned.

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

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SLIDE 27

Information Required from FNAL - -

  • Details of the water cooling systems inlet/outlet connectors, pressure drop,

tolerable inlet temperature etc needs to be mentioned

  • Quality assurance plans
  • Standards, certification requirements
  • Packaging requirements

Feb 27, 2015

  • Packaging requirements

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

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SLIDE 28

Delivery Schedule of 10 kW SSRFPA

Sr. No. 2015 2016 1/4/2017 1/12/2017 2018 2019 2020 2021 2022 1 BARC

  • 01

01

  • 2

BARC- ECIL Technology transfer to ECIL and production of subsequent 10 kW units X* X* X* X* X* ECIL production of subsequent 10 kW units *Subject to discussion with ECIL

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

Feb 27, 2015

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SLIDE 29

Conclusion

  • Design topology for high efficiency RF power modules is proven

with results

  • Design topology for good power splitters / combiners is proven

with results

  • RF amplifiers at 1, 3, 7 kW have been developed and tested as

per its design specifications per its design specifications

  • Optimization of RF parameters for further improvements is in

progress

  • For 10 kW RFPA, design is completed and purchase of main

components for one prototype unit is underway.

  • For 10 kW RFPA, design or some additional features may get

added based on the feedback from FNAL

Feb 27, 2015

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

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SLIDE 30

RFSS /IADD/BARCTeam

  • 1. Mrs. Manjiri Pande
  • 2. Mr. B.V.R.Rao
  • 3. Mr. J.K.Mishra
  • 3. Mr. J.K.Mishra
  • 4. Mrs. S.V.Sharma

5.Mr. S.D.Shrotriya 6.Mr. N.R.Patel 7.Mr. S.Muthu

  • 8. Mr. Hitesh Kadam

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC

Feb 27, 2015

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SLIDE 31

Thank You ! You !

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Feb 27, 2015

IIFC- 325 MHz RF- meeting- manjiri - IADD-BARC