X-Ray Optics PhD | Partially Coherent Imaging and Computational Methods

X-Ray Optics PhD | Partially Coherent Imaging and Computational Methods

Quick Decision

This is a paid, three-year Physics PhD employment opportunity with two advertised openings at the University of Göttingen Institute for X-Ray Physics. The post lists a 75% TV-L E13 contract and a 4 December 2026 deadline. The University portal captured in the existing records identifies the matching job number 76748, although the application content retrieved does not show a closing date; confirm the deadline and time zone before submitting. The collected project details also contained an alternate link ending 76735, so use the matching 76748 portal and verify the route. University application portal, job no. 76748

The scientific fit is strongest for a Master's graduate in physics or a close field who wants to combine X-ray optics, coherent imaging, instrumentation, diffraction-data analysis or computational imaging. The group’s recent work in waveguide optics and phase retrieval closely matches the advertised scope. The main limitation is that the two openings are not mapped publicly to specific work packages: the final plan is to be discussed at interview and depends on the candidate profile and project needs. The next useful action is to confirm the deadline/link, then ask which opening is centered on which research question and what facility access is already secured.

Research Problem and Doctoral Work

What Is Unsolved and Why It Matters

The advertised challenge is to develop and apply X-ray optics and new imaging methods that use partially coherent radiation for biomolecular structure analysis and related soft-matter or biophysical applications. Conventional diffraction is most straightforward for large ensembles and relatively homogeneous structures. The Institute’s stated research motivation is to extend X-ray structure analysis toward non-crystalline, hydrated and more complex biological matter, while improving how much structural information can be obtained from limited photon flux. Institute for X-Ray Physics Salditt Group research

The project notice names synchrotron and free-electron-laser sources as well as laboratory micro-CT. Depending on the selected emphasis, the work may concern X-ray optical physics, instrument development, diffraction-data analysis, computational imaging, or application benchmarks in soft-matter physics and biophysics. Those are alternatives or combinations, not a promise that each doctoral researcher will do all of them. The notice says the exact focus and work plan will be agreed in an interview, matched to the candidate’s background and interests and to collaborations and third-party project needs.

Work, Methods, and Potential Outputs

Recent group research provides concrete examples of the available technical environment. A 2026 paper on X-ray waveguide optics at GINIX/P10 reports new waveguide materials and designs, characterization of transmission and coherence, and progress toward off-axis interferometric holography. It shows that optics design and characterization are an active research strand relevant to the vacancy, but it does not establish that this specific post will reproduce any one setup. Waveguide optics at GINIX/P10

A 2026 study on phase retrieval goes beyond the common homogeneous-object assumption in a contrast-transfer-function approach and reports better reconstruction quality at similar computational cost in the tested comparisons. This is directly relevant to the advertised diffraction-analysis and computational-imaging paths. The 2025 HoToPy paper describes an open Python toolbox for X-ray holographic tomography, including phase retrieval, alignment, image processing and simulation components. Together they show that algorithm development, reproducible analysis and imaging benchmarks are credible options; Python expertise is not stated as a mandatory hiring condition. Phase-retrieval study HoToPy toolbox paper

A collaborative 2024 study used X-ray holography with optical shadowgraphy to resolve bubble dynamics at a free-electron laser. It illustrates how the group’s methods can be used in time-resolved applications, while its cavitation subject is different from the biomolecular and soft-matter examples emphasized in this vacancy. XFEL holography study

Based on the advert and these papers, plausible doctoral angles include comparing illumination or optical configurations, characterizing how coherence and wavefront properties affect imaging, improving or benchmarking reconstruction, or applying a method to a selected soft-matter/biophysical problem. These are analytical possibilities, not promised outputs. The key interview task is to pin down the actual sample or application, the balance between experiments and computation, the planned comparison metrics, and what would count as a successful first-year result.

School, Programme and Field Context

The employer is the Institute for X-Ray Physics at Georg-August University of Göttingen. The relevant degree path is the University’s accredited Physics doctorate under the Georg-August University School of Science (GAUSS); the programme awards either Dr. rer. nat. or Ph.D. and has a six-semester nominal duration. The advertised employment is three years, which aligns with that nominal period, but the offer does not itself replace formal doctoral admission and enrollment. No evidence indicates that DESY or PETRA III awards the degree; those are research-facility and collaboration contexts. Physics doctoral programme Physics admission guidance GAUSS supervision information

Physics doctoral researchers complete a dissertation and oral defense and acquire 30 credits through thesis-advisory meetings, scientific presentation and communication, scientific writing, scientific qualifications, tutorial teaching and key competencies. A three-person thesis advisory committee is part of the GAUSS framework. Admission normally requires a relevant Master's degree or equivalent and at least four years of total study, a written supervision pledge and faculty approval. For applicants whose first language is neither English nor German, the Physics programme describes C1 proficiency in English or German, or a qualifying Master's taught in either language, as evidence of language competence. The position lists German and English as working languages, so applicants should confirm the actual daily-language expectations with the group.

In THE World University Rankings by Subject 2026, Göttingen ranks 78th worldwide and sixth in Germany in Physical Sciences. The category combines physics with chemistry, mathematics, statistics, astronomy, geology and environmental sciences; it is useful broad context, not a dedicated physics or X-ray optics ranking. University summary of THE 2026 results

Supervisor and Lab Assessment

Professor Tim Salditt is listed as a professor of experimental physics at Göttingen since 2002, with research interests in X-ray optics, synchrotron radiation, biomolecular structure and X-ray microscopy. His group describes a programme spanning biomolecular assemblies through cells and tissues, with high-resolution holographic X-ray imaging as a primary focus. The institute also includes research groups in cellular biophysics and structural dynamics/ultrafast spectroscopy, creating a wider local science environment. Tim Salditt profile Institute and research groups

The group page identifies GINIX at the P10 coherence beamline of PETRA III at DESY as a site of coherent nano-imaging work. DESY’s facility description provides an independent account of the GINIX setup. This is a meaningful experimental context for optics and coherent imaging, but public material does not guarantee an individual candidate’s beamtime, access schedule or travel budget. The advert also names laboratory micro-CT and FEL sources as possible settings; confirm which are actually attached to each position. GINIX research context DESY description of GINIX at P10

Recent publications present a coherent mix of optical hardware, computational reconstruction and application work. That breadth is a strength for candidates who want to shape their PhD around one clear competency and build complementary skills. The unresolved point is supervisory organization: the public sources name Salditt as group leader but do not identify a day-to-day supervisor, co-supervisor split or the candidate’s committee. Ask who will meet regularly with the doctoral researcher and how collaborations contribute to supervision rather than assuming that every named facility partner is directly involved.

Funding, Application, and Living Cost

The advertised support is employment at 75% of TV-L E13 for three years. The official TV-L table valid 1 April–31 December 2026 sets full-time E13 at €4,759.37 for step 1 and €5,106.09 for step 2, implying about €3,569.53 and €3,829.57 gross per month at 75%. The official table from March 2027 raises these indicative step 1/2 amounts to €3,640.92 and €3,906.16. The correct step depends on recognized prior experience and must be confirmed in the offer; these figures are gross, not take-home pay. Official 2026 TV-L table Official 2027 TV-L table

The University’s international student guide estimates about €992 per month for living costs as of June 2026; another official page gives a baseline of at least €800–€1,000. These are useful comparison points, not an employee-specific net budget. The housing guidance lists dorm rooms at €300–€400 per month, shared-flat rooms at €450–€700, and one-room apartments at €600–€800. Dorm places are not guaranteed and the current page describes a wait of roughly 12 months. For winter semester 2026/27, the student contribution is €484.18; confirm the amount applicable to doctoral enrollment and each later term. International student cost guide Göttingen living costs Accommodation guidance Semester fees, winter 2026/27

Applicants from outside the EU/EEA should check the residence route with the University and the relevant authorities. Federal German guidance notes that a researcher residence route may be based on an employment contract or hosting agreement, and that doctoral researchers completing their thesis as part of employment can qualify subject to the applicable requirements and individual case. Germany research visa guidance

The application page matching the role is job number 76748. The project details state that applicants should upload the usual documents, including a motivation letter, CV and certificates, together as a PDF. The saved University portal instructions ask for PDF files and encourages certificates to be consolidated where possible. The deadline is stated as 4 December 2026 in the project details, while a numeric date “12/4/2026” also appears; since the saved portal content does not show the closing date, confirm the date format, time zone and exact document bundle before sending. University online application, job no. 76748

Applicant Fit and Preparation

Required: a very good Master's degree or equivalent in Physics or a closely related field, together with strong potential and motivation for interdisciplinary research. Formal doctoral admission will also require faculty approval, a supervisor pledge, degree equivalence and enrollment under the Physics/GAUSS rules.

Preferred, but not required at the start according to the notice: X-ray or medical physics, computational and numerical skills, and experience with laboratory instrumentation or experiments. The structured application profile also highlights motivation for optics and computational imaging and knowledge of computational/numerical methods. Clarify how those profile points are weighted in selection.

Useful preparation: present a concise account of a prior research project that shows either optical/instrumental reasoning, numerical analysis or experimental work; connect it to one of the advertised branches rather than claiming expertise across all of them. Explain how you handled uncertainty, data quality or method comparison. Ask which computational tools, source configurations and applications define the specific position. The group describes German and English as the job’s working languages, while the Physics doctorate has its own language-evidence rules; confirm what is needed for daily research and formal admission.

Germany’s photonics sector provides a plausible route beyond academic research for skills in optics, imaging, instrumentation and computation: a 2026 industry profile reports €50 billion in 2024 turnover and about 188,000 employees across roughly 1,000 manufacturers, including activity in imaging, medical technology, optical components, automation and R&D. These sector totals are context, not a forecast of openings for this graduate; language, location, specialization and experience will affect individual prospects. Photonics Industry in Germany

Next Actions and Questions to Verify

Before Applying

• Confirm that job number 76748 is the active portal and that 4 December 2026 is the deadline, including the closing time and time zone; the numeric date in the project details is ambiguous.
• Ask whether the required upload is one consolidated PDF or separate PDF files, and whether academic records, references or language certificates are expected beyond the motivation letter and CV.
• If the Master's degree is from outside Germany/Bologna signatories, ask the Physics faculty how equivalence is assessed and what documents or translations are needed.

At Interview

• Which of the two posts is associated with each research theme, sample/application and methods mix?
• What is the expected first-year question, comparison or benchmark, and which outcomes are realistic within the three-year employment period?
• How will optics/experiments, computation and application work be divided? Which laboratory micro-CT, PETRA III/P10 or FEL access is already planned, and what depends on future beamtime allocation?
• Who will provide regular day-to-day supervision? How will the professor, group members and external collaborators divide guidance, and when is the three-person thesis advisory committee formed?

Before Accepting an Offer

• Confirm the start date, weekly work share, initial TV-L step, gross salary, any allowances and written contract term.
• Confirm the Physics/GAUSS admission and enrollment schedule, credit requirements, semester contribution and any additional foreign-degree conditions.
• For non-EU/EEA applicants, confirm which residence permit applies to the employed doctoral researcher, and how health insurance and payroll deductions are handled.
• Ask what travel/beamtime funds, instrument access, publication expectations and schedule contingencies are included in the project.

Evidence and Sources

Core Institutional and Programme Sources

• University online application, job no. 76748
• Institute for X-Ray Physics
• Physics doctoral programme
• Physics admission guidance
• GAUSS supervision and examination information
• University summary of THE 2026 subject ranking

Supervisor, Laboratory and Publications

• Tim Salditt profile
• Salditt Group research and activity
• DESY description of GINIX at P10
• X-ray waveguide optics at GINIX/P10
• Phase retrieval beyond the homogeneous-object assumption
• HoToPy X-ray holo-tomography toolbox
• XFEL X-ray holography study of bubble dynamics

Funding, Application, Cost and Market

• Official TV-L salary table, April–December 2026
• Official TV-L salary table from March 2027
• University international student cost guide, June 2026
• University living-cost estimate
• Housing guidance for international doctoral researchers
• Semester fees for winter 2026/27
• Federal guidance on research visas
• Photonics Industry in Germany