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RF Electronics Engineer

Company: LBL
Location: California City
Posted on: September 18, 2022

Job Description:

Lawrence Berkeley National Lab's (LBNL) Engineering Division has an opening for an RF Electronics Engineer to join the RF engineering team.

In this role, you will support the Advanced Light Source (ALS) accelerator complex, in a variety of engineering tasks to include developmental work, characterization measurements, design and develop subsystems and conduct repairs in support of the RF systems currently installed and perform reconfiguration and design work of planned system upgrades. This involves design using ECAD tools and evaluation of designs using circuit simulation, as well as work on high voltage and high power RF systems.

This includes work on pulsed megawatt klystrons and tens to hundred kilowatt class CW tetrodes, inductive output tubes (IOT), klystrons and solid state amplifiers along with coaxial and waveguide transmission systems , circulators and other RF structures in the several hundred megahertz to multiple gigahertz frequency ranges.

This position will be hired at a level commensurate with the business needs; and skills, knowledge, and abilities of the successful candidate.

What You Will Do:

  • Execute detailed electronics circuit design by creating schematics, PCB layouts, simulations and all documentation required for fabrication. Plan and execute verification testing and diagnostics.
  • Support the ALS RF systems. Support requires the upgrade, repair, and maintenance of the following systems:
    • Electron Gun System, a thermionic gun that is pulsed at 125 MHz and operates at an accelerating potential of 120 kV DC.
    • Sub-Harmonic Buncher amplifier systems operating at 125 & 500 MHz in pulse mode at 20 kW.
    • 24 MW pulsed S-Band Pulsed Modulators delivering power to the 3 GHz Linac accelerating structures.
    • 80 kW CW, 500 MHz IOT based Booster Ring RF amplifier system.
    • 65 kW CW, 500 MHz Klystron based Cavity Teststand amplifier system.
    • 300 kW CW, 500 MHz Klystron based Storage Ring RF system.
    • Solid-state RF amplifiers at 125 MHz, 500 MHz & 3 GHz.
    • HVDC Power Supply systems with 208 VAC, 480 VAC and 4160 VAC input, up to 56 kV DC output and 800 kW average power.
    • Hi-speed amplifier protection systems; Thyratron crowbar and Insulated Gate Bipolar Transistor (IGBT) disconnect switch.
    • Normal conducting, Ultra High Vacuum (UHV) high-Q resonant RF cavities at 125, 500 MHz & 1.5 & 3.0 GHz.
    • Coaxial, WR-284, WR-650 and WR-1800 waveguide RF transmission line systems.
    • Higher Order Mode (HOM) Damping systems.
    • Temperature Controlled water cooling systems.
    • Work collaboratively with a broad range of scientists and engineers both from LBNL and from other institutions to provide recommendations, requirements, and specifications, and implement solutions in your area of expertise.
    • Support preparation of new proposals, from the development of technical concepts to the preparation of budgets and schedules.
    • Document ongoing and completed work and present it at conferences and workshops. Publish in relevant journals.
    • Help coordinate electronic and mechanical resources needed to complete a task or project.
    • Improve documentation, baseline data, and operating and maintenance procedures.
    • Adhere to the Berkeley Lab's EH&S policies and maintain all required related training up to date.

      Additional Responsibilities as needed:
      • Have sufficient general electronics experience to know how to analyze results and propose new novel systems and design upgrades.
      • Work in complex user facilities.
      • Provide guidance to technical staff.

        What is Required:
        • Minimum of 5 years of related engineering experience with a Bachelor's degree; or 3 years related experience and a Master's degree; or equivalent work experience
        • Experience in three or more of the five segments of RF Engineering:
          • the design, construction, implementation, operation, and maintenance of systems involving pulsed megawatt klystrons and hundred kilowatt class CW klystrons in the several hundred megahertz to multiple gigahertz frequency ranges including associated power supplies and modulators.
          • Experience with E-CAD tools: schematic capture, layout, simulation, and design for manufacture.
          • Demonstrate knowledge and experience with RF and microwave electronic instrumentation such as vector network analyzers, spectrum/signal analyzers, signal generators, high speed oscilloscopes, and RF power meters.
          • Demonstrate strong troubleshooting and diagnostic skills in independently resolving most RF system design and operation issues.
          • Ability to work effectively in a cross functional engineering and scientific research team environment.

            Desired Qualifications:
            • Ph.D. and/or Master's degree in Electrical Engineering or related field.
            • 5+ years of experience working in a research and development environment (R&D).
            • Demonstrated ability to enhance capabilities to a complex user facility, while minimizing operational impact. An example includes upgrading tube based RF amplifiers with solid state RF amplifiers.
            • Demonstrate ability to support the estimation of manpower, time, and expense for the completion of projects.
            • Have working knowledge of Knowledge of beam interaction with accelerating structures and UHV materials and assembly techniques.
            • Experience with 3D structure simulation tools such as Ansys HFSS or CST Studio Suite as well as analog and RF circuit simulation tools such as PSPICE and Keysight ADS.

              • This is a full time, 2 years, term appointment with the possibility of extension or conversion to Career appointment based upon satisfactory job performance, continuing availability of funds and ongoing operational needs.
              • This position may be subject to a background check. Any convictions will be evaluated to determine if they directly relate to the responsibilities and requirements of the position. Having a conviction history will not automatically disqualify an applicant from being considered for employment.
              • Berkeley Lab is committed to Inclusion, Diversity, Equity and Accountability (IDEA) and strives to hire individuals from different backgrounds, experiences, and perspectives who share these same values and commitments.
              • Work will be primarily performed at Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA.

                Based on University of California Policy - SARS-CoV-2 (COVID-19) Vaccination Program and U.S Federal Government requirements, Berkeley Lab requires that all members of our community obtain the COVID-19 vaccine as soon as they are eligible. As a condition of employment at Berkeley Lab, all Covered Individuals must Participate in the COVID-19 Vaccination Program by providing proof that vaccination requirements have been met or submitting a request for Exception or Deferral. Visit for more information.

                Berkeley Lab is committed to Inclusion, Diversity, Equity and Accountability (IDEA) and strives to continue building community with these shared values and commitments. Berkeley Lab is an Equal Opportunity and Affirmative Action Employer. We heartily welcome applications from women, minorities, veterans, and all who would contribute to the Lab's mission of leading scientific discovery, inclusion, and professionalism. In support of our diverse global community, all qualified applicants will be considered for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, age, or protected veteran status.

                Equal Opportunity and IDEA Information Links:

                Know your rights, click here for the supplement: Equal Employment Opportunity is the Law and the Pay Transparency Nondiscrimination Provision under 41 CFR 60-1.4.

Keywords: LBL, Lancaster , RF Electronics Engineer, Engineering , California City, California

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