Jun 2020 – Present · 5 yrs 11 mos · Oak Ridge, Tennessee, United States

• ① 𝟮𝟳 𝗠𝗛𝘇 𝗥𝗙 𝗣𝗹𝗮𝘀𝗺𝗮 𝗜𝗴𝗻𝗶𝘁𝗶𝗼𝗻 𝗦𝘆𝘀𝘁𝗲𝗺
• ━━━━━━━━━━━━━━━━━━━━━━
• Designed a 27 MHz RF system to improve plasma ignition at SNS
• ↳ reduced power needs, removed gas puffing, improved H⁻ output
• Solved baseline 13 MHz issues
• ↳ required 300 to 450 W continuous power
• ↳ plasma instability
• ↳ depended on gas puffing to ignite
• Built a pulsed 27 MHz RF system
• ↳ 50 μs pulses
• ↳ 0.3% duty cycle
• ↳ validated on the Ion Source Test Stand (ISTS)
• Key components optimized
• ↳ High pass filter: < 0.1 dB insertion loss @ 27 MHz
• ↳ Isolation transformer: 70 kV isolation, 0.16 dB insertion loss @ 27.12 MHz
• Results achieved
• ↳ Reliable ignition at 100 W peak pulsed power (0.3 W average)
• ↳ H₂ flow reduced to 25 sccm (stable at 15 sccm)
• ↳ 80 mA H⁻ beam current
• ↳ ~ 10³ reduction in power consumption vs 13 MHz baseline
• ━━━━━━━━━━━━━━━━━━━━━━
• ② 𝗥𝗶𝗻𝗴 𝗥𝗙 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 𝗮𝗻𝗱 𝗕𝘂𝗻𝗰𝗵 𝗖𝗼𝗺𝗽𝗿𝗲𝘀𝘀𝗶𝗼𝗻
• ━━━━━━━━━━━━━━━━━━━━━━
• Reconfigured Ring RF cavities for better beam accumulation and extraction
• ↳ from 3 × 1.1 MHz (h=1) + 1 × 2.2 MHz (h=2)
• ↳ to 2 × h=1 + 2 × h=2 cavities
• Supported new tetrode tube installation
• ↳ improved amplifier reliability
• ↳ enabled stable long term operations
• Enabled bunch compression experiments
• ↳ configured Ring RF system for beam manipulation
• ↳ supported compression needs for future muon collider work
• ━━━━━━━━━━━━━━━━━━━━━━
• ③ 𝗗𝗼𝘄𝗻𝘁𝗶𝗺𝗲 𝗗𝗮𝘁𝗮 𝗔𝗻𝗮𝗹𝘆𝘁𝗶𝗰𝘀 𝗳𝗼𝗿 𝗣𝗿𝗲𝗱𝗶𝗰𝘁𝗶𝘃𝗲 𝗠𝗮𝗶𝗻𝘁𝗲𝗻𝗮𝗻𝗰𝗲
• ━━━━━━━━━━━━━━━━━━━━━━
• Built a Python analytics workflow using Pandas
• ↳ processed 4,000+ SNS LINAC downtime events (2006 to 2022)
• Created a framework to isolate high downtime devices
• ↳ supports future root cause analysis
• ↳ enables predictive maintenance strategy

Aug 2019 – May 2020 · 9 mos

• ENEE 381: Electromagnetic Wave Propagation
• 1. Weekly discussion sessions with students.
• 2. Grading Assignments.

Jan 2019 – Aug 2019 · 7 mos

• Design, Modelling & Development of High-Efficiency Megawatt Class Constant Impedance Tunable Power Extraction Circuits for Mobile Ionospheric Heaters
• 1. Designed a tunable power extraction circuit (pi-circuit consisting of capacitors and inductors connected in pi shape) for a 70kV-30A Grid-less Tetrode (novel RF source) used in Mobile Ionospheric Heaters at RF frequencies (3-10 MHz) (PSPICE).
• 2. Challenges in building a high-efficiency circuit are to ensure maximum power delivery to load(antenna) and minimum dissipation in circuit elements. Modelled inductor parasitic effects like proximity effect and self-resonance to reduce the winding losses (Ansys MAXWELL, HFSS).
• 3. Proposed and designed a novel high-efficiency inductor to ensure 99% power is delivered to the load.
• 4. Tested and verified the design concept for 90% efficiency(Network Analyzer).
• 5. Measured the winding resistance of highly efficient inductors (Q: 800-900) with less than 10% error.
• Design & Development of High Voltage Power Supply, Grid Bias Voltage System & Solenoid for Beam Confinement
• 1. A high voltage power supply (0 - 3.5kV) was built to act as an input source to a step-up transformer that generates a 35kV output for the gun.
• 2. To ensure pulsed beam output from the thermionic emitter, a grid bias voltage circuitry was built using pulse generators, photo-detectors and a DC source.
• 3. Assisted in building a solenoid used for beam confinement on the electron gun.
• Experiments on the Electron Gun
• 1. To demonstrate the principle, the experiment is carried out on a relatively low power gun (35kV-3A). The pi-circuit is connected across the gap for power extraction (Thermionic Gun, Ion Pump, High Voltage Transformers, Photo-detectors, IGBTs, Bulk Capacitors).
• 2. All the modules (power supply, grid bias voltage system) are appropriately integrated to make the gun operational. Gun bring up to obtain expected current levels (around 3A beam current).

Jul 2015 – Jan 2019 · 3 yrs 6 mos

Nov 2014 – Jul 2015 · 8 mos

Jun 2012 – Jul 2014 · 2 yrs 1 mo · Bengaluru Area, India

• 1. Diagnosed RTL design issues on microprocessor core through stall, mismatch and assertion debugging. Suggested appropriate design and verification fixes on both server and low power
• microprocessors. (System Verilog, Verilog, C++, Verdi)
• 2. Improved both functional and code coverage for a feature and instruction verification on our low
• power microprocessor used in upcoming Sony (PS4), Microsoft (Xbox) and Nintendo gaming
• consoles. (C++)
• 3. Test-plans to verify new instructions on the next generation server (X86) microprocessors (Verdi, ASM, C++).

Jun 2011 – May 2012 · 11 mos · Bangalore, India

• 1. Implemented and conducted wafer level tests of a 32-bit micro-controller based on ARM Cortex-M4 processor used in industrial applications and diagnosed pattern generation problems on J750 tester (Visual Basic for J750 testing).
• 2. Developed test program for measuring mixed signal parameters for Analog-to-Digital Converter (ADC) (C, Visual Basic).

Dec 2010 – Apr 2011 · 4 mos · Manyata Tech Park, Bangalore

• Completed the implementation and integration of Automatic Channel Change Tool, for conducting soak test and debugging during the developmental cycle of the Set Top Box