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CIS Postdoctoral Fellow
Job ID #: 12370 Location: Newport News, VA
Functional Area: Science Division: Accelerator Ops, R & D
Position Type: Term Education Required: Doctorate (Professional)
Experience Required: Less than 1 year Relocation Provided: Yes

As a matter of corporate policy, all JSA employees are required to be vaccinated against COVID-19.  All successful hires will be required to provide COVID-19 vaccination verification as a condition of employment, subject to limited legally recognized exemptions to the COVID-19 vaccination.

SALARY RANGE: $59,500 - $89,300 (PD)  
The Center for Injectors and Sources (CIS) is responsible for expanding the capability of the CEBAF photoinjector - to deliver high average current beams of highly polarized electrons, with excellent operational lifetime - and to provide the exceptional “parity quality beams” necessary for the MOLLER parity-violation experiment to be successful. Work involves the development of high voltage photoemission electron guns and low energy electron beamlines, improved ultrahigh and extreme high vacuum techniques, novel photoemission cathodes, sophisticated lasers producing optical beams with RF time structure, and fundamental understanding of depolarization mechanisms in various semiconductors.  CIS is also responsible for the photo-gun and low-energy polarized beam line at the UITF, and supports significant research in achieving EIC deliverables.

Working with the scientific and technical staff of the Center for Injectors and Sources, the incumbent in this position will participate in characterizing spin-polarized photocathodes which operate in today’s very high voltage photo-guns.  The incumbent will spend much of his/her time in the group’s vacuum lab, building a load-locked vacuum system and micro-Mott polarimeter for the spectral characterization of photocathode quantum efficiency and spin-polarization; and also at the Upgraded Injector Test Facility – a facility to commission new equipment, and for performing experiments that shed light on limitations of photo-gun technology.  In support of photocathode development, the incumbent will participate in the CEBAF Injector Upgrade commissioning activities, to evaluate materials and processing techniques for producing polarized beam in a 200 kV photo-gun, and then with first polarized beam commissioning of the new injector. This work includes characterizing the injector setup and photocathode performance necessary to provide high intensity polarized beams for the MOLLER experiment with small helicity-correlated beam charge and position differences.  The incumbent will also assist with operations of the CEBAF photoinjector, including maintenance and commissioning activities during accelerator shutdowns.

A Ph.D. in Physics, Applied Physics, or a closely related engineering discipline and specific training is required.  A demonstrated experimental physics background in one or more of the technologies specific to polarized electron sources or electron polarimetry, e.g., ultrahigh or extreme high vacuum technology, high voltage DC photoemission electron gun design, low energy electron beamline design, electron beam diagnostic development, surface science, specialized lasers, sophisticated data acquisition systems like those required for parity violation experiments, etc., is also required.  The demonstrated ability to translate laboratory developments into functional systems on operating accelerators is a strong plus.

 We are looking for someone with enthusiasm, a thinkerer, who enjoys “owning” a test stand, using it and improving it.  A clever and energetic group member will certainly find many ways to contribute to interesting projects that include: assessment and elimination of field emission from cathode electrodes, optimization of the high voltage electrostatic design of new photo-guns, improved vacuum, improved mechanical design of sophisticated “load-locked” vacuum chambers, detailed assessment and prioritization of many parameters that influence photo-gun lifetime and photocathode development.

Please send at least 2 reference letters and a cover letter to Crystal Brinkman (

JSA will not sponsor H1B visas for this position

• Ability to comprehend, formulate, and communicate highly abstract concepts
• Ability to express or exchange complex ideas by means of spoken and written communication
• Ability to analyze and interpret complex data and develop models

• Ability to traverse across various locations on the laboratory site and access work areas
• Ability to lift up to 10 pounds frequently and 25 pounds occasionally
• Ability to stoop, bend over and climb ladders
• Ability to work on a computer for extended periods
• Visual capabilities sufficient to use computer workstations, read documents, and see safety alarms
• Auditory capabilities to hear safety alarms

Jefferson Science Associates, LLC (JSA) manages and operates the Thomas Jefferson National Accelerator Facility (Jefferson Lab). JSA is an Equal Opportunity Employer and does not discriminate in hiring or employment on the basis of race, color, religion, ethnicity, sex, sexual orientation, gender identity, national origin, ancestry, age, disability, or veteran status or on any other basis prohibited by federal, state, or local law. As part of the JSA’s equal employment opportunity policy, we also take affirmative action as called for by applicable laws and Executive Orders to ensure that minority group individuals, females, disabled veterans, recently separated veterans, other protected veterans, Armed Forces, and qualified disabled persons are introduced into our workforce and considered for promotional opportunities.

JSA is committed to providing reasonable accommodations for persons with disabilities (unless doing so will result in an undue hardship). If you need a reasonable accommodation for any part of the employment process, please send an e-mail to or call (757) 269-7598 to provide the nature of your request. Reasonable accommodations are considered on a case-by-case basis.

Employment with JSA is conditional upon DOE approval if at any time during your employment you are participating in a Foreign Government Talent Recruitment Program or Affiliated activity. Generally, such programs/activities include any foreign-state-sponsored attempt to acquire U.S.-funded scientific research through programs run or funded by the government that target scientists, engineers, students, academics, researchers, and entrepreneurs of all nationalities working or educated in the United States. This includes positions or appointments, both domestic and foreign, titled academic, professional, or institutional appointments whether or not remuneration is received and whether full-time, part-time or voluntary.

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