Juergen Pfingstner

Post-doctoral Fellow

Email juergen.pfingstner@fys.uio.no

Mobile phone +41 76 707 51 19 +41-767075119

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Visiting address CERN Room 9-1-8 Geneva 23 CH-1211 Switzerland

Postal address CERN Room 9-1-8 Geneva 23 CH-1211 Switzerland

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Academic interests

Linear particle accelerators.
- CLIC and ILC.
- Emittance preservation techniques.
- Ground motion effects.
Free electron lasers.
- Undulator design and simulation.
- THz radiation facilities.
Signal and system theory.
- Feedback control.
- System identification.
- Applications to particle accelerators.

Education and Appointments

Postdoctoral Fellow (01/2015 - now).
- University of Oslo.
- Topics: Free electron laser design, THz radiation facilities, and emittance preservation at CLIC.
Postdoctoral Fellow (01/2012 - 12/2014).
- CERN.
- Topics: Emittance preservation at CLIC with focus on misalignment and ground motion effects.
- Experimental studies at ATF2 (KEK).
PhD in Physics (10/2008 - 03/2013).
- Vienna University of Technology.
- Topic of PhD thesis: Mitigation of ground motion effects via feedback systems for the Compact Linear Collider.
Master of Science in Electrical Engineerig (09/2002 - 11/2008).
- Graz University of Technology.
- Specialisation in control engineering and electromagnetic field compution.
- Topic of master thesis: Adaptive inverse kinematics for wheeled mobile robots.

Collaborations

CERN, ILC especially ATF2, XbFEL.

Marin, E.; Latina, A; Schulte, D; Tomas, R & Pfingstner, Juergen (2018). Tuning of CLIC-Final Focus System 3 TeV Baseline Design under Static and Dynamic Imperfections. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 1067(2), p. 1–6. doi: 10.1088/1742-6596/1067/2/022014. Full text in Research Archive Show summary
In this paper we present the tuning study of the Compact Linear Collider - Final Focus System (CLIC-FFS) 3 TeV baseline design under static and dynamic imperfections for the first time. The motion of the FFS magnets due to ground motion and the impact of active and passive mechanisms envisaged to stabilize both e − and e + systems are described. It is found that the Pre-isolator required for stabilization of the Final Doublet drives the performance of the collider at the final stages of the tuning process. The obtained tuning performance depending on the stabilization techniques are discussed in detail.
Pfingstner, Juergen; Adli, Erik & Schulte, Daniel (2017). On-line dispersion estimation and correction scheme for the Compact Linear Collider. Physical Review Accelerators and Beams. ISSN 2469-9888. 20. doi: 10.1103/PhysRevAccelBeams.20.011006. Full text in Research Archive Show summary
The Compact Linear Collider (CLIC) has stringent component alignment tolerances in order to preserve the ultralow emittance of the utilized particle beams. Beam-based alignment techniques have been designed to relax these tolerances to realizable values. In this paper, a scheme is presented that is capable of mitigating besides the effects of static misalignments also dynamic misalignments caused by ground motion. It is based on the well-known dispersion-free steering (DFS) algorithm, with the peculiarity that it can perform its correction during the usual operation (on-line). This is enabled by performing the necessary dispersion measurements by introducing only negligibly small beam energy changes (per mille level). It has been found that this on-line correction becomes sensitive to the imperfections of transverse wakefields and structure tilts. These sensitivities have been studied via analytical models and in simulations and appropriate countermeasures to improve the robustness of the method have been proposed. The correction performance and robustness properties of the improved algorithm have been studied in detail with respect to all relevant static and dynamic imperfections in a realistic scenario. The presented scheme is not only a potentially important operational tool for CLIC, but the findings with respect to robustness properties for different imperfections are of general interest for the application of the dispersion-free steering algorithm.
Lillestol, Reidar; Adli, Erik; Aftab, N.; Corsini, Roberto; Döbert, S. & Farabolini, W. [Show all 10 contributors for this article] (2016). Status of Wakefield Monitor Experiments at the CLIC Test Facility. In Petit-Jean-Genaz, Christine; Kim, Dong Eon; Kim, Kyung Sook; Ko, In Soo; Kim, Kyung Ryul & Schaa, Volker RW (Ed.), Proceedings of the 7th International Particle Accelerator Conference. JACoW. ISSN 9783954501472. Full text in Research Archive
Aksoy, A.M.; Latina, A; Nergiz, Zafer; Pfingstner, Juergen & Schulte, D (2016). Design Optimization of an X-band based FEL. In Petit-Jean-Genaz, Christine; Kim, Dong Eon; Kim, Kyung Sook; Ko, In Soo; Kim, Kyung Ryul & Schaa, Volker RW (Ed.), Proceedings of the 7th International Particle Accelerator Conference. JACoW. ISSN 9783954501472. Full text in Research Archive
Pfingstner, Juergen; Bett, D.; Charrondiere, C.; Patecki, M.; Schulte, D & Tomas, R [Show all 13 contributors for this article] (2016). Ground motion compensation using feed-forward control at ATF2. In Petit-Jean-Genaz, Christine; Kim, Dong Eon; Kim, Kyung Sook; Ko, In Soo; Kim, Kyung Ryul & Schaa, Volker RW (Ed.), Proceedings of the 7th International Particle Accelerator Conference. JACoW. ISSN 9783954501472. Full text in Research Archive
Lindstrøm, Carl Andreas; Adli, Erik; Pfingstner, Juergen; Marin, E. & Schulte, D (2016). Transverse tolerances of a multi-stage plasma wakefield accelerator. In Petit-Jean-Genaz, Christine; Kim, Dong Eon; Kim, Kyung Sook; Ko, In Soo; Kim, Kyung Ryul & Schaa, Volker RW (Ed.), Proceedings of the 7th International Particle Accelerator Conference. JACoW. ISSN 9783954501472. p. 2561–2564. Full text in Research Archive Show summary
Plasma wakefield acceleration (PWFA) provides GeV/m-scale accelerating fields, ideal for applications such as a future linear collider. However, strong focusing fields imply that a transversely offset beam with an energy spread will experience emittance growth from the energy depen- dent betatron oscillation. We develop an analytic model for estimating tolerances from this effect, as well as an effective simplified simulation tool in Elegant. Estimations for a proposed 1 TeV PWFA linear collider scheme indicate tight tolerances of order 40 nm and 1 μrad in position and angle respectively.
Pfingstner, Juergen; Adli, Erik; Lindstrøm, Carl Andreas; Marin, E. & Schulte, D (2016). Considerations for a drive beam scheme for a plasma wakefield linear collider. In Petit-Jean-Genaz, Christine; Kim, Dong Eon; Kim, Kyung Sook; Ko, In Soo; Kim, Kyung Ryul & Schaa, Volker RW (Ed.), Proceedings of the 7th International Particle Accelerator Conference. JACoW. ISSN 9783954501472. p. 2565–2568. Full text in Research Archive Show summary
The potential for high average gradients makes plasma wakefield acceleration (PWFA) an attracting option for future linear colliders. For a beam-driven PWFA collider a sequence of cells has to be supplied with synchronised drive beam bunches. This paper is concerned with the generation, transport and distribution of these drive beam bunches in a so-called drive beam complex for a 3 TeV collider. Based on earlier concepts, several modifications are suggested. The new design includes a superconducting linac and an optimised bunch delay system with a tree structure. To verify the feasibility for the overall complex, a lattice design and tracking studies for the critical bending arc subsystem are presented. Also the feasibility of a compact bunch separation system is shown. The result of these efforts is a drive beam complex that is optimised for construction cost and power efficiency that favours unified lattice solutions.
Pfingstner, Juergen; Adli, Erik & Schulte, D (2015). Effect of accelerating structures on on-line DFS in the main linac of CLIC, Proceedings of the 6th International Particle Accelerator Conference. Jefferson Lab, Newport News. ISSN 9783954501687. Full text in Research Archive
Pfingstner, Juergen (2015). The X-band FEL collaboration, Proceedings of the 37th International Free Electron Laser Conference. Creative Commons Attribution 3.0 license. ISSN 9783954501335. Full text in Research Archive
Snuverink, J; Fuster-Martinez, Nuria & Pfingstner, Juergen (2015). A linear accelerator simulation framework, Proceedings of the 6th International Particle Accelerator Conference. Jefferson Lab, Newport News. ISSN 9783954501687. Full text in Research Archive
Pfingstner, Juergen & Adli, Erik (2015). Performance and tolerance studies of the X-ray production for the X-band FEL collaboration, Proceedings of the 37th International Free Electron Laser Conference. Creative Commons Attribution 3.0 license. ISSN 9783954501335. Full text in Research Archive
Latina, Andrea; Pfingstner, Juergen; Schulte, D; Adli, Erik; Snuverink, J & Fuster-Martinez, Nuria (2015). Tests of wakefield-free steering at ATF2, Proceedings of the 6th International Particle Accelerator Conference. Jefferson Lab, Newport News. ISSN 9783954501687. Full text in Research Archive
Lillestol, Reidar; Adli, Erik; Pfingstner, Juergen; Corsini, Roberto; Doebert, Steffen & Farabolini, Wilfrid [Show all 8 contributors for this article] (2015). Wakefield monitor development for X-band accelerating structures, Proceedings of the 6th International Particle Accelerator Conference. Jefferson Lab, Newport News. ISSN 9783954501687. Full text in Research Archive
Pfingstner, Juergen (2014). Mitigation of ground motion effects in linear accelerators via feed-forward control. Physical Review Special Topics. Accelerators and Beams. 17(122801). Full text in Research Archive
Latina, Andrea; Pfingstner, Juergen; Pellegrini, Dario; Adli, Erik & Schulte, D (2014). Toolbox for applying beam-based alignment to linacs, Proceedings of the 27th Linear Accelerator Conference. Creative Commons Attribution 3.0. ISSN 9783954501427. Full text in Research Archive
Pfingstner, Juergen (2014). Experimental verification of feed-forward ground motion mitigation at ATF2, Proceedings of the 27th Linear Accelerator Conference. Creative Commons Attribution 3.0. ISSN 9783954501427. Full text in Research Archive

View all works in NVA

Pfingstner, Juergen (2016). Studies of emittance preservation methods and the status of their experimental validation. Full text in Research Archive
Pfingstner, Juergen (2016). PETS on/off option for on-line DFS. Full text in Research Archive
Pfingstner, Juergen (2015). Free-electron lasers. Full text in Research Archive
Pfingstner, Juergen (2015). Photon production. Full text in Research Archive
Pfingstner, Juergen (2015). Progress in CLIC DFS studies. Full text in Research Archive
Pfingstner, Juergen (2015). Experimental verification towards feed-forward ground motion mitigation at ATF2. Full text in Research Archive
Pfingstner, Juergen (2015). On-Line DFS in the CLIC Main Linac. Full text in Research Archive
Pfingstner, Juergen (2014). Improved imperfection tolerances for an on-line dispersion free steering algorithm. Full text in Research Archive

View all works in NVA

Published Jan. 23, 2015 2:10 PM - Last modified Jan. 31, 2017 2:22 PM