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Publications (10 of 65) Show all publications
Ziemann, V., Rolf, W., Wiren, A. & Peterson, T. (2020). Retro-Fitting Earth-Field Compensation Coils to the Vertical Cryostat GERSEMI in FREIA. Instruments
Open this publication in new window or tab >> Retro-Fitting Earth-Field Compensation Coils to the Vertical Cryostat GERSEMI in FREIA
2020 (English)In: Instruments, ISSN ISSN 2410-390XArticle in journal (Refereed) Published
Abstract [en]

We describe the design and construction of coils to compensate the Earth’s magnetic field in the vertical cryostat GERSEMI in the FREIA laboratory at Uppsala University.

Place, publisher, year, edition, pages
Basel: , 2020
National Category
Accelerator Physics and Instrumentation
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
urn:nbn:se:uu:diva-406814 (URN)10.3390/instruments4010008 (DOI)
Available from: 2020-03-12 Created: 2020-03-12 Last updated: 2020-03-12
Ziemann, V. (2019). Beam Optics Primer using Octave or MATLAB.
Open this publication in new window or tab >>Beam Optics Primer using Octave or MATLAB
2019 (English)Report (Other academic)
Abstract [en]

This primer provides a basic introduction to beam optics concepts that arecommonly used to describe charged particle accelerators.

Publisher
p. 23
Series
FREIA Report ; 2019/03
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-389509 (URN)
Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-07-24Bibliographically approved
Andersson Sundén, E., Gustavsson, C., Hjalmarsson, A., Jacewicz, M., Lantz, M., Marciniewski, P., . . . Lundén, K. (2019). Citizen Science and Radioactivity. Nuclear Physics News, 29(2), 25-28
Open this publication in new window or tab >>Citizen Science and Radioactivity
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2019 (English)In: Nuclear Physics News, ISSN 1050-6896, Vol. 29, no 2, p. 25-28Article in journal (Other (popular science, discussion, etc.)) Published
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-401547 (URN)10.1080/10619127.2019.1603559 (DOI)
Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-23Bibliographically approved
Holz, M. & Ziemann, V. (2019). Envelope dynamics and stability with non-linear space-charge forces. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 951, Article ID 163045.
Open this publication in new window or tab >>Envelope dynamics and stability with non-linear space-charge forces
2019 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 951, article id 163045Article in journal (Refereed) Published
Abstract [en]

We developed a model to calculate the stability of Gaussian beam distributionswith non-linear space-charge forces in the presence of random and skewquadrupoleerrors. The eect of the space-charge force on the beam matrix iscalculated analytically including full cross-plane coupling in 4D phase space,which allows us to perform fast parameter studies. For stability analysis, wend the xed points of the beam including the space-charge forces and constructa Jacobi-matrix by slightly perturbing the periodic solution. The stability ofenvelope oscillations is inferred by eigenvalue analysis. Furthermore, we employenvelope tracking as a complementary method and compare the results ofthe eigenvalue analysis with FFT data from the tracked envelope. The nonlinearityof the space-charge force in combination with lattice errors and beamcoupling opens up for envelope-lattice resonances and envelope coupling resonances.Hitting these resonances leads to envelope blow-up, causing an eectivebeam mismatch. Therefore, we nally examine the eect of beam mismatch onthe envelope tune-shift and its stability.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
space-charge, beam stability, quadrupole error, skew quadrupole, stop-band
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-396644 (URN)10.1016/j.nima.2019.163045 (DOI)000502088900021 ()
Available from: 2019-11-07 Created: 2019-11-07 Last updated: 2020-01-14Bibliographically approved
Ziemann, V. (2019). Hands-On Accelerator Physics Using MATLAB®. Boca Raton: Taylor & Francis Group
Open this publication in new window or tab >>Hands-On Accelerator Physics Using MATLAB®
2019 (English)Book (Refereed)
Place, publisher, year, edition, pages
Boca Raton: Taylor & Francis Group, 2019. p. 358
National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-382727 (URN)9781138589940 (ISBN)
Available from: 2019-04-30 Created: 2019-04-30 Last updated: 2020-03-11Bibliographically approved
Ziemann, V., Wedberg, R., Peterson, T. & Wirén, A. (2018). Earth-field Compensation Coils for the Vertical Cryostat in FREIA.
Open this publication in new window or tab >>Earth-field Compensation Coils for the Vertical Cryostat in FREIA
2018 (English)Report (Other academic)
Abstract [en]

We describe the design and construction of coils to compensate the Earth magnetic field in the vertical cryostat in FREIA.

Publisher
p. 27
Series
FREIA Report ; 2018/01
National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-346574 (URN)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-03-21Bibliographically approved
Ögren, J. & Ziemann, V. (2018). Optimum resonance control knobs for sextupoles. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 894, 111-118
Open this publication in new window or tab >>Optimum resonance control knobs for sextupoles
2018 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 894, p. 111-118Article in journal (Refereed) Published
Abstract [en]

We discuss the placement of extra sextupoles in a magnet lattice that allows to correct third-order geometric resonances, driven by the chromaticity-compensating sextupoles, in a way that requires the least excitation of the correction sextupoles. We consider a simplified case, without momentum-dependent effects or other imperfections, where suitably chosen phase advances between the correction sextupoles leads to orthogonal knobs with equal treatment of the different resonance driving terms.

National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-330972 (URN)10.1016/j.nima.2018.03.041 (DOI)000430704600014 ()
Funder
Swedish Research Council, 2011-6305Swedish Research Council, 2014-6360Knut and Alice Wallenberg Foundation
Available from: 2017-10-09 Created: 2017-10-09 Last updated: 2018-08-03Bibliographically approved
Ziemann, V. (2018). PuddlePeeker: a system to monitor the water level at the bottom of the vertical cryostat in FREIA.
Open this publication in new window or tab >>PuddlePeeker: a system to monitor the water level at the bottom of the vertical cryostat in FREIA
2018 (English)Report (Other academic)
Publisher
p. 10
Series
FREIA Report ; 2018/02
Keywords
water level sensor
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-347147 (URN)
Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-27Bibliographically approved
Ögren, J. & Ziemann, V. (2017). Aligning linac accelerating structures using a copropagating octupolar mode. Physical Review Accelerators and Beams, 20, Article ID 102801.
Open this publication in new window or tab >>Aligning linac accelerating structures using a copropagating octupolar mode
2017 (English)In: Physical Review Accelerators and Beams, ISSN 2469-9888, Vol. 20, article id 102801Article in journal (Refereed) Published
Abstract [en]

We propose a novel method to align accelerating structures such as those used in the Compact Linear Collider (CLIC) by exploiting a mode that copropagates with the normal accelerating mode. This mode has an octupolar dependence in the transverse direction and is caused by radial waveguides intended to damp higher-order modes. The nonlinear dependence of the octupolar mode makes it possible to determine the center of the structure from the nonlinear dependence of the transverse kick, observed on a downstream beam position monitor, while changing the transverse position of the beam with respect to the accelerating structures. We discuss the method, its tolerances and disentangling the individual misalignments of two adjacent accelerating structures that are powered from a single source.

Place, publisher, year, edition, pages
College Park, MD: American Physical Society, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-331616 (URN)10.1103/PhysRevAccelBeams.20.102801 (DOI)000413054500001 ()
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council, 2011-6305Swedish Research Council, 2014-6360
Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2018-01-29Bibliographically approved
Ali, H., Eriksson, J., Li, H., Jafri, S. H., Kumar, M. S., Ögren, J., . . . Leifer, K. (2017). An electron energy loss spectrometer based streak camera for time resolved TEM measurements. Ultramicroscopy, 176, 5-10
Open this publication in new window or tab >>An electron energy loss spectrometer based streak camera for time resolved TEM measurements
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2017 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 176, p. 5-10Article in journal (Refereed) Published
Abstract [en]

We propose an experimental setup based on a streak camera approach inside an energy filter to measure time resolved properties of materials in the transmission electron microscope (TEM). In order to put in place the streak camera, a beam sweeper was built inside an energy filter. After exciting the TEM sample, the beam is swept across the CCD camera of the filter. We describe different parts of the setup at the example of a magnetic measurement. This setup is capable to acquire time resolved diffraction patterns, electron energy loss spectra (EELS) and images with total streaking times in the range between 100 ns and 10 μs.

Keywords
Time resolved; TEM; Energy filter; Streak camera; Sweep
National Category
Physical Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-329982 (URN)10.1016/j.ultramic.2016.11.026 (DOI)000403992200003 ()
Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2019-12-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6229-5620

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