| 1. |
- Curbis, F, et al.
(författare)
-
HIGHLIGHTS FROM THE CONCEPTUAL DESIGN REPORT OF THE SOFT X-RAY LASER AT MAX IV
- 2021
-
Ingår i: Proceedings of IPAC2021.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The SXL (Soft X-ray Laser) project developed a conceptual design for a soft X-ray Free Electron Laser (FEL) in the 1-5 nm wavelength range, driven by the existing MAX IV 3 GeV linac. In this contribution we will focus on the FEL operation modes developed for the first phase of the project based on two different linac modes. The design work was supported by the Knut and Alice Wallenberg foundation and by several Swedish universities and organizations (
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| 2. |
- Andersen, J., et al.
(författare)
-
The soft X-ray laser project at MAX IV
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - : Joint Accelerator Conferences Website - JACoW. - 9783954501823 ; , s. 2760-2762
-
Konferensbidrag (refereegranskat)abstract
- A Soft X-ray Laser (SXL) beamline utilising FEL technology is being designed for the Short Pulse Facility (SPF) at the MAX IV Laboratory. A conceptual design study has been started following on the scientific case already prepared in collaboration between several Swedish Universities and driven by a strong (Swedish) user demand. The baseline goal of the SXL beamline is to generate intense and short pulses in the range 1-5 nm (0.2-1 keV). The system is building on the MAX IV linac system, already today providing 100 fs 3 GeV and pulses compressed to 100 fs for other applications within the SPF. As a special feature we foresee a variety of pump-probe capabilities.
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| 3. |
- Curbis, F., et al.
(författare)
-
Status of the soft X-ray laser (SXL) project at the Max IV laboratory
- 2019
-
Ingår i: Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019. - : JACoW Publishing. - 9783954502103 ; , s. 749-752
-
Konferensbidrag (refereegranskat)abstract
- A Soft X-ray Laser project (the SXL) aiming to produce FEL radiation in the range of 1 to 5 nm is currently in a conceptual design phase and a report on the design is expected to be delivered by March 2021. The FEL will be driven by the existing 3 GeV linac at MAX IV laboratory, which also serves as injector for the two storage rings. The science case has been pushed by a large group of mainly Swedish users and consists of experiments ranging from AMO physics to condensed matter, chemistry and imaging in life science. In this contribution, we will present the current conceptual design of the accelerator and the FEL operation modes together with a general overview of the beamline and experimental station. In particular design options for the FEL will be discussed in conjunction with the features of the electron beam from the MAX IV linac and the connection with the proposed experiments.
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| 4. |
- Pirani, S, et al.
(författare)
-
START-TO-END STUDY ON LASER AND RF JITTER EFFECTS FOR MAX IV SXL
- 2021
-
Ingår i: Proceedings of IPAC2021. ; , s. 844-846
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A Soft X-ray free electron laser (FEL) for the MAX IV Laboratory is currently in the design phase and it will use the existing 3 GeV linac. Present stability limits in the RF and the photocathode laser will affect the performance of the FEL. One of the critical elements for the design of a FEL is to have an estimation on jitter effects of the accelerator parameters on the X-ray radiation. In this regard, we implemented a start-to-end study using Astra, Elegant and Genesis in order to assess possible variations in pulse energy, photon pulse length and spectral width in the Soft X-ray Laser (SXL) radiation. This investigation provides insights on the final SXL performance variation due to RF and laser related jitter affecting the electron beam.
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| 5. |
- Andersson, J, et al.
(författare)
-
Emittance improvements in the MAX IV photocathode injector
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 - 9783954501823 ; , s. 1533-1536
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The MAX IV injector design predicts a beam with 100 pC of charge and an emittance lower than 1 mm mrad. The photocathode pre-injector is based on the now close to standard 1.6-cell gun adapted to 2.9985 GHz, in combination with a Ti:Sapphire laser system. This system reaches the requirements of the injector operation for the SPF, but can be tuned beyond specifications to open up new operation modes. During 2016 and 2017 several aspects where investigated to improve the emittance from the current gun, the goal was to meet the SPF specifications. In this paper we report on the progress, discuss the steps taken leading to a final emittance of 1 mm mrad and beyond.
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| 6. |
- Andersson, J, et al.
(författare)
-
The New MAX IV Gun Test Stand
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 - 9783954501823 ; , s. 1537-1540
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The gun test stand from MAX-Lab has been upgraded and moved to a new facility at the MAX IV Laboratory. The new test stand will reuse parts of the equipment from the old test stand but a number of improvements to the setup are be made. In this paper we report on the design of the new gun test stand, research plans in the near future as well as planned and possible future research topics..
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| 7. |
- Curbis, F., et al.
(författare)
-
Prospects for longitudinal phase-space measurements at the MAX IV linac
- 2014
-
Ingår i: IPAC 2014 : Proceedings of the 5th International Particle Accelerator Conference - Proceedings of the 5th International Particle Accelerator Conference. - 9783954501328 ; , s. 3665-3667
-
Konferensbidrag (refereegranskat)abstract
- Knowing the longitudinal phase space of an electron beam is one of the most important and crucial issues in short-pulses linacs. To achieve this task expensive and rather complicated setups (like transverse deflecting cavities) are usually implemented. The MAX IV linac is a 3GeV accelerator which will be used to inject into two rings and to drive a short pulse facility. Nevertheless, a more deep understanding of the beam quality would be useful especially in view of an upgrade as FEL driver. Another interesting aspect is to evaluate how the double-achromat bunch compressors are performing. We are studying how to implement off-phase acceleration: one part of the linac will be set at zero-crossing phase and the following transfer line could be used as energy spectrometer to retrieve the bunch profile. In the present configuration of the MAX IV linac this procedure will allow to check the bunch length after the first bunch compressor. Since it is work in progress, in this contribution we present a sketch of the measurement and the feasibility of the method will be explored by means of simulations.
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| 8. |
- Guo, J. H., et al.
(författare)
-
Characterization of undulator radiation at MAXII using a soft X-ray fluorescence spectrometer
- 1999
-
Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0168-9002. ; 431:1, s. 285-293
-
Tidskriftsartikel (refereegranskat)abstract
- A grazing-incidence grating spectrometer has been used for the investigation of the undulator radiation from beamline 411 at MAX-lab. The direct detection of undulator light is expected to obtain the information of the quality of the undulator. Regular undulator radiation and some higher harmonics were observed. The effects of electronic beam coupling and Landau cavities have been studied. The experiment presents an easy and quick method to characterize the undulator radiation before the permanent monochromator is installed.
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| 9. |
- Karlberg, O., et al.
(författare)
-
Characterization of longitudinal wakefields in the MAX IV linac
- 2014
-
Ingår i: IPAC 2014 : Proceedings of the 5th International Particle Accelerator Conference - Proceedings of the 5th International Particle Accelerator Conference. - 9783954501328 ; , s. 3050-3052
-
Konferensbidrag (refereegranskat)abstract
- In the second part of 2014, the 3 GeV linac at the MAX IV laboratory will enter its commissioning stage. Equipped with two guns, the linac will act as a full energy injector for the two storage rings and at the same time provide high brightness pulses to a Short Pulse Facility (SPF). Compression in the linac is done in two double achromats with fixed R56 that relies upon the RF phase introduced energy chirp, which in this case is strongly enhanced by the longitudinal wakefields. Since the longitudinal wakefields play a major role in the compression and bunch shaping they need to be carefully investigated during the commissioning. In this proceeding we will discuss a measurement technique that will be used during commissioning to characterize the longitudinal wakefields in the MAX IV linac and their precise effects on e.g. the bunch shape and the energy spread. Predictions obtained from particle tracking will be presented.
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| 10. |
- Kotur, M, et al.
(författare)
-
PHOTOCATHODE LASER PULSE SHAPING FOR IMPROVED EMITTANCE
- 2018
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Ingår i: Proceedings of the 29th Linear Accelerator Conference, LINAC 2018. - 9783954501946 ; , s. 84-86
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Konferensbidrag (refereegranskat)abstract
- We present a setup for producing and characterizing picosecond ultraviolet laser pulses for use in the MAX IV photocathode electron gun preinjector. Frequency-tripled laser pulses from a commercial laser system are shaped directly in the ultraviolet domain using a Fourier-domain pulse shaper. The pulses were characterized using a transient grating FROG. We discuss a proposed upgrade of the pulse shaper, as well as its limitations.
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| 11. |
- Kotur, M, et al.
(författare)
-
Pulse shaping at the MAX IV photoelectron gun laser
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 - 9783954501823 ; , s. 1541-1543
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A motivation for the development of a versatile, programmable source of shaped picosecond pulses for use in photocathode electron gun preinjectors is presented. We present the experimental setup for arbitrary longitudinal pusle shaping of the MAX IV photocathode gun laser. The setup consists of a grating-based Fourier-domain shaper capable of stretching the pulses directly in the UV domain. Preliminary results are presented and discussed.
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| 12. |
- Lindau, F, et al.
(författare)
-
MAX IV Photocathode Gun Laser System Specification and Diagnostics
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 - 9783954501823 ; , s. 1544-1546
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The MAXIV injector has two guns - a thermionic used for ring injections, and a photocathode used for short pulse facility operation. A commercial Ti:sapphire laser from KMLabs drives the copper based photocathode gun. It has been running without major issues for more than 3 years. The laser delivers up to §I{500}{\textmu J} on the cathode at the third harmonic, §I{263}{nm}, via a vacuum laser transport system. To achieve the desired pulse duration of 2–§I10{ps} the laser pulses, originally ~§I{100}{fs} long, are stretched with a prism pair and the resulting §I{1.5}{ps} pulses stacked by a series of birefringent \textalpha -BBO crystals. Diagnostics consist of photodiodes, spectrometers, and cameras. Longitudinal pulse characterization is done with a cross correlator and a UV FROG.
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| 13. |
- Lundquist, J S, et al.
(författare)
-
ESS DTL Tuning Using Machine Learning Methods
- 2021
-
Ingår i: Proceedings of IPAC2021. - 2673-5490. - 9783954502141 ; , s. 1872-1875
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The European Spallation Source, currently under construction in Lund, Sweden, will be the world's most powerful neutron source. It is driven by a proton linac with a current of 62.5 mA, 2.86 ms long pulses at 14 Hz. The final section of its normal-conducting front-end consists of a 39 m long drift tube linac (DTL) divided into five tanks, designed to accelerate the proton beam from 3.6 MeV to 90 MeV. The high beam current and power impose challenges to the design and tuning of the machine and the RF amplitude and phase have to be set within 1% and 1 ∘ of the design values. The usual method used to define the RF set-point is signature matching, which can be a time consuming and challenging process, and new techniques to meet the growing complexity of accelerator facilities are highly desirable. In this paper we study the usage of Machine Learning to determine the RF optimum amplitude and phase. The data from a simulated phase scan is fed into an artificial neural network in order to identify the needed changes to achieve the best tuning. Our test for the ESS DTL1 shows promising results, and further development of the method will be outlined.
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| 14. |
- Lundquist, J. S., et al.
(författare)
-
MACHINE LEARNING METHODS FOR SINGLE SHOT RF TUNING
- 2021
-
Ingår i: 10th International Beam Instrumentation Conference, IBIC 2021 - Proceedings. - 2078-8835. - 9783954502301 ; , s. 313-316
-
Konferensbidrag (refereegranskat)abstract
- The European Spallation Source, currently under construction in Lund, Sweden, will be the world’s most powerful neutron source. It is driven by a proton linac with a current of 62.5 mA, 2.86 ms long pulses at 14 Hz. The final section of its normal-conducting front-end consists of a 39 m long drift tube linac (DTL) divided into five tanks, designed to accelerate the proton beam from 3.6 MeV to 90 MeV. The high beam current and power impose challenges to the design and tuning of the machine and the RF amplitude and phase have to be set within 1% and 1◦ of the design values. The usual method used to define the RF set-point is signature matching, which can be a challenging process, and new techniques to meet the growing complexity of accelerator facilities are highly desirable. In this paper we study the use of ML to determine the RF optimum amplitude and phase, using a single pass of the beam through the ESS DTL1 tank. This novel method is compared with the more established methods using scans over RF phase, providing similar results in terms of accuracy for simulated data with errors. We also discuss the results and future extension of the method to the whole ESS DTL.
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| 15. |
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| 16. |
- Pop, M, et al.
(författare)
-
ANALYSIS OF THE EFFECT OF ENERGY CHIRP IN IMPLEMENTING EEHG AT SXL
- 2021
-
Ingår i: Proceedings of IPAC2021. ; , s. 1566-1569
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- As a part of the efforts to improve the longitudinal coherence in the design of the Soft X-ray FEL (the SXL) at MAX IV, we present a possible implementation of the EEHG harmonic seeding scheme partly integrated into the second bunch compressor of the existing LINAC. A special focus is given to the effect of CSR on the resulting EEHG bunching and on how this unwanted effect might be controlled.
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| 17. |
- Pop, Mihai, et al.
(författare)
-
Single-shot transverse coherence in seeded and unseeded free-electron lasers: A comparison
- 2022
-
Ingår i: Physical Review Accelerators and Beams. - 2469-9888. ; 25:040701
-
Tidskriftsartikel (refereegranskat)abstract
- The advent of x-ray free-electron lasers (FELs) drastically enhanced the capabilities of several analytical techniques, for which the degree of transverse (spatial) coherence of the source is essential. FELs can be operated in self-amplified spontaneous emission (SASE) or seeded configurations, which rely on a qualitatively different initialization of the amplification process leading to light emission. The degree of transverse coherence of SASE and seeded FELs has been characterized in the past, both experimentally and theoretically. However, a direct experimental comparison between the two regimes in similar operating conditions is missing, as well as an accurate study of the sensitivity of transverse coherence to key working parameters. In this paper, we carry out such a comparison, focusing in particular on the evolution of coherence during the light amplification process.
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| 18. |
- Qin, W., et al.
(författare)
-
Start-to-end simulations for the soft X-ray FEL at the Max IV laboratory
- 2019
-
Ingår i: Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019. - 9783954502103 ; , s. 210-213
-
Konferensbidrag (refereegranskat)abstract
- A Soft X-ray FEL (the SXL) using the existing 3 GeV linac at the MAX IV Laboratory is currently in the design phase. In this contribution, start-to-end simulations, including the photo-injector simulations using ASTRA, the linac simulations using ELEGANT and the FEL simulations using GENESIS, are presented for 100 pC and 10 pC operation modes. The features of the electron beam from the MAX IV linac and their impact on the FEL performance are discussed.
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| 19. |
- Samoilenko, D, et al.
(författare)
-
Sensitivity of EEHG simulations to dynamic beam parameters
- 2023
-
Ingår i: 13th International Particle Accelerator Conference (IPAC'22) 12 - 17 June 2022, Bangkok, Thailand. - : IOP Publishing. - 1742-6588. ; 2420
-
Konferensbidrag (refereegranskat)abstract
- Currently, the Free electron laser user facility FLASH at DESY is undergoing a significant upgrade involving the complete transformation of one of its beamlines to allow external seeding. With the Echo-Enabled Harmonic Generation (EEHG) seeding method, we aim for the generation of fully coherent XUV and soft X-ray pulses at wavelengths down to 4 nm. The generated FEL radiation is sensitive to various electron beam properties, e.g., its energy profile imprinted either deliberately or by collective effects such as Coherent Synchrotron Radiation (CSR). In dedicated particle tracking simulations, one usually makes certain assumptions concerning the beam properties and the collective effects to simplify implementation and analysis. Here, we estimate the influence of some of the common assumptions made in EEHG simulations on the properties of the output FEL radiation, using the example of FLASH and its proposed seeding beamline. We conclude that the inherent properties of the FLASH1 beam, namely the negatively chirped energy profile, has dominant effect on the spectral intensity profile of the radiators output compare to that of the CSR induced chirp.
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| 20. |
- Andersson, J., et al.
(författare)
-
Beam performance of the photocathode gun for the MAX IV LINAC
- 2014
-
Ingår i: Proceedings of the 36th International Free Electron Laser Conference, FEL 2014. - 9783954501335 ; , s. 799-802
-
Konferensbidrag (refereegranskat)abstract
- The MAX IV facility in Lund (Sweden) is under construction and conditioning of the electron guns for the injector is ongoing. There are two guns in the injector, one thermionic gun for storage ring injection and one photocathode gun for the Short Pulse Facility. In this paper we report on the beam performance tests of the photocathode gun. The measurements were performed at the MAX IV electron gun test stand [1] during spring 2014. Parameters that were studied includes quantum efficiency, emittance and emittance compensation. Results from the measurements are also compared to particle simulations done with ASTRA.
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| 21. |
- Andersson, Åke, et al.
(författare)
-
Experiences with the narrow gap undulator at MAX-lab
- 1995
-
Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 362:2-3, s. 586-591
-
Tidskriftsartikel (refereegranskat)abstract
- An undulator with short poles (period 24 mm) and extremely narrow gap (magnet gap 7.7 mm) using a squeezable vacuum chamber has been installed and is in operation at the MAX-lab 550 MeV storage ring. The device operates with a vacuum chamber aperture down to 6.2 mm. The behaviour of the storage ring concerning lifetime, emittance, tune shift and closed orbit is well described by conventional models. We present here the design of the device, the influence on the storage ring and the spectral characteristics, as well as comparison with expected theoretical results and an overview of the activities at the beam line.
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| 22. |
- Andersson, Å, et al.
(författare)
-
The new 1.5 GeV storage ring for synchrotron radiation : MAX II
- 1995
-
Ingår i: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 66:2, s. 1850-1853
-
Tidskriftsartikel (refereegranskat)abstract
- The MAX laboratory at Lund University, Sweden, today operates an accelerator system consisting of a 100 MeV racetrack microtron and a 550 MeV storage ring (MAX I). At the moment (July 1994) a new storage ring MAX II is near completion and will start first injections within 2 months. This work gives an overview of the MAX II project including the first beamlines and a description of the accelerator system. MAX II is a 1.5 GeV third generation light source optimized for the VUV and soft-x-ray region. It consists of a ten cell double bend achromat lattice forming the 90 m circumference ring. Injection is done at 500 MeV from the existing storage ring MAX I, and ramping up to full energy will take place in MAX II. The straight sections have a length of 3.2 m and eight sections are free to house insertion devices. At start up the ring will be equipped with one 7.5 T superconducting wiggler and one 1.8 T multipole wiggler. Two more undulators are ordered and under construction. To be able to achieve the project a few shortcuts have been made in the design of the storage ring: (1) Nonzero dispersion is allowed in the straight sections, (2) chromaticity correction is built into the quadrupole magnets, and (3) the length of the straight sections is limited to 3.2 m. The project is progressing on time. Extraction of an electron beam from the MAX I storage ring has been achieved and has successfully been transported into the MAX II building. The MAX II ring is under assembly with most of the sections already mounted. First injection is planned to take place in August 1994.
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| 23. |
- Eriksson, Mikael, et al.
(författare)
-
MAX4, a 3 GeV light source with a flexible injector
- 2002
-
Ingår i: 8th European Particle Accelerator Conference. ; , s. 686-687
-
Konferensbidrag (refereegranskat)abstract
- The MAX4 ring is intended to be the future user facility at MAXlab. The high-brilliance 3 GeV storage ring, equipped with small gap, short period superconducting undulators, demonstrates a high mean brilliance over a wide photon energy spectrum. The ring itself is defined from the routine operation of the small gap insertion devices, which is reflected in the small aperture of the ring magnets. The development of future light sources, like the free electron laser and energy recovery systems, opens up new challenging possibilities to create high brilliance, short pulse radiation. This development is today far from being mature, a strong development of new ideas and techniques will most probably take place during the next decade(s). The MAX4 full-energy injector is constructed to incorporate these future developments. The proposed 3 GeV energy recovery race-track microtron will open up the possibility of topping up injection and to deliver Fourier transform limited spontaneous as well as coherent radiation up to the hard X-ray spectral region
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| 24. |
- Guo, JH, et al.
(författare)
-
The characterization of undulator radiation at MAXII using a soft X-ray fluorescence spectrometer
- 1999
-
Ingår i: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT. - : ELSEVIER SCIENCE BV. - 0168-9002. ; 431:1-2, s. 285-293
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A grazing-incidence grating spectrometer has been used for the investigation of the undulator radiation from beamline 411 at MAX-lab. The direct detection of undulator light is expected to obtain the information of the quality of the undulator. Regular un
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| 25. |
- Leblanc, G., et al.
(författare)
-
The MAX-III storage ring
- 2001
-
Ingår i: PACS2001. Proceedings of the 2001 Particle Accelerator Conference. - 0780371917 ; , s. 2474-2475
-
Konferensbidrag (refereegranskat)abstract
- MAX-III is a 700 MeV storage ring for synchrotron radiation that is being built at MAX-lab. The ring will provide radiation in the UV and IR spectral regions. The ring will have a 100 MHz RF system combined with a 500 MHz passive Landau cavity. The lattice is compact, with combined function magnets. The magnets are integrated into the girder providing for ease of alignment.
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| 26. |
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| 27. |
- Nyholm, R., et al.
(författare)
-
Submicrometer-resolution photoelectron-spectroscopy at MAX Lab
- 1989
-
Ingår i: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 60:7, s. 2168-2171
-
Tidskriftsartikel (refereegranskat)abstract
- The design of a photoemission microprobe beamline at the MAX laboratory is presented. The beamline will utilize the radiation from a 26 period undulator on the 550-MeV MAX storage ring. The beamline will be capable of providing about 1010 photons/s of monochromatized radiation (bandwidth better than 0.25 eV) in the energy range of 20 to 150 eV focused into a submicrometer focal spot. It will be used for scanning photoemission experiments with a lateral resolution better than 1 μm. The optical system is comprised of a plane-grating monochromator with a Kirkpatrick-Baez objective and a specially designed ellipsoidal focusing mirror.
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| 28. |
- Qin, W., et al.
(författare)
-
Advanced concepts in the design for the soft X-ray FEL at Max IV
- 2019
-
Ingår i: Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019. - 9783954502103 ; , s. 214-217
-
Konferensbidrag (refereegranskat)abstract
- A Soft X-ray FEL (the SXL) is currently being designed at the MAX IV Laboratory. In the work to adapt the FEL to the scientific cases several advanced options are being studied for coherence enhancement, generation of short pulses and two-color pulses. We will discuss the current status and initial results of the schemes studied, especially regarding the FEL performance with the features of the MAX IV linac, including a positive energy chirp.
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| 29. |
- Samoilenko, D, et al.
(författare)
-
Discussion on CSR instability in EEHG Simulation
- 2021
-
Ingår i: Proceedings of IPAC2021.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Echo-Enabled Harmonic Generation (EEHG) is an external seeding technique for XUV and soft X-ray Free Electron Lasers (FEL). It has recently been experimentally demonstrated and currently many facilities worldwide intend to incorporate it in user operation. The EEHG process relies on very accurate and complex transformations of electron beam phase space by means of a series of undulators coupled to lasers and dispersive chicanes. As a result of the phase space manipulation, electrons are bunched at a high harmonic of the seed laser wavelength allowing coherent emission at few nm wavelength.
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| 30. |
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| 31. |
- Walker, R. P., et al.
(författare)
-
Design of an electromagnetic elliptical wiggler for ELETTRA
- 1998
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Ingår i: ; , s. 3527-3529
-
Konferensbidrag (refereegranskat)abstract
- The initial concept of the electromagnetic elliptical wiggler (EEW) for ELETTRA is a combination of a vertical permanent magnet to generate a wiggler field and a horizontal electromagnet to provide the possibility of switching the helicity of the X-ray radiation. The main aspects of the design of the EEW under construction for ELETTRA are discussed.
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| 32. |
- Walker, R.P., et al.
(författare)
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The European UV/VUV storage ring FEL at ELETTRA : First operation and future prospects
- 2001
-
Ingår i: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002. ; 467-468, s. 34-37
-
Tidskriftsartikel (refereegranskat)abstract
- A European project to develop the first storage ring free-electron laser on a third-generation synchrotron radiation facility is presented, including a description of the main features, initial performance at 350 and 220 nm and future prospects.
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| 33. |
- Wallén, Erik, et al.
(författare)
-
Status of the MAX IV light source project
- 2007
-
Ingår i: 9th International Conference on Synchrotron Radiation Instrumentation (SRI 2006). - 9780735403734 ; 879, s. 34-37
-
Konferensbidrag (refereegranskat)abstract
- The MAX IV light source project is presented. The MAX IV light source will consist of three low emittance storage rings and a 3 GeV injector linac. The three storage rings will be operated at 700 MeV, 1.5 GeV, and 3.0 GeV, which make it possible to cover a large spectral range from IR to hard X-rays with high brilliance undulator radiation from insertion devices optimised for each storage ring. The preparation of the injector linac to serve as a short pulse source and the major sub-systems of the facility are also presented.
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