| 1. |
- Enquist, Henrik, et al.
(author)
-
FemtoMAX - An X-ray beamline for structural dynamics at the short-pulse facility of MAX IV
- 2018
-
In: Journal of Synchrotron Radiation. - 0909-0495. ; 25:2, s. 570-579
-
Journal article (peer-reviewed)abstract
- The FemtoMAX beamline facilitates studies of the structural dynamics of materials. Such studies are of fundamental importance for key scientific problems related to programming materials using light, enabling new storage media and new manufacturing techniques, obtaining sustainable energy by mimicking photosynthesis, and gleaning insights into chemical and biological functional dynamics. The FemtoMAX beamline utilizes the MAX IV linear accelerator as an electron source. The photon bursts have a pulse length of 100fs, which is on the timescale of molecular vibrations, and have wavelengths matching interatomic distances (Å). The uniqueness of the beamline has called for special beamline components. This paper presents the beamline design including ultrasensitive X-ray beam-position monitors based on thin Ce:YAG screens, efficient harmonic separators and novel timing tools.The FemtoMAX beamline facilitates studies of the structural dynamics of materials on the femtosecond timescale. The first commissioning results are presented.
|
|
| 2. |
- Eriksson, Mikael, et al.
(author)
-
The MAX IV Facility
- 2013
-
In: 11th International Conference on Synchrotron Radiation Instrumentation (SRI 2012). - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 425
-
Conference paper (peer-reviewed)abstract
- The MAX IV synchrotron radiation facility is currently being constructed in Lund, Sweden. The accelerator park consists of a 3 GeV linac injector and 2 storage rings operated at 1.5 and 3 GeV respectively. The linac injector will also be used for the generation of short Xray pulses. Close to 30 straight sections will be available for IDs at the rings. The three machines mentioned above are described below with some emphasis on the effort to create a very small emittance in the 3 GeV ring. Some unconventional technical solutions imposed by the emittance minimisation are discussed.
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
- Björklund Svensson, Jonas, et al.
(author)
-
Double-bunches for two-color soft X-ray free-electron laser at the MAX IV Laboratory
- 2018
-
In: Proceedings of FEL2017, Santa Fe, NM, USA. - 9783954501793 ; , s. 269-272
-
Conference paper (other academic/artistic)abstract
- The ability to generate two-color free-electron laser (FEL) radiation enables a wider range of user experiments than just single-color FEL radiation. There are different schemes for generating the two colors, the original being to use a single bunch and two sets of undulators with different K-parameters. An alternative scheme was recently shown, where two separate bunches in the same RF bucket are used for lasing at different wavelengths in a single set of undulators. We here investigate the feasibility of accelerating and compressing a double-bunch time structure generated in the photocathode electron gun for subsequent use in a soft X-ray FEL at the MAX IV Laboratory.
|
|
| 6. |
- Björklund Svensson, Jonas, et al.
(author)
-
Driver-witness-bunches for plasma-wakefield acceleration at the MAX IV Linear Accelerator
- 2017
-
In: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 ; , s. 1743-1746
-
Conference paper (other academic/artistic)abstract
- Beam-driven plasma-wakefield acceleration is an acceleration scheme promising accelerating fields of at least two to three orders of magnitude higher than in conventional radiofrequency accelerating structures. The scheme relies on using a charged particle bunch (driver) to drive a non-linear plasma wake, into which a second bunch (witness) can be injected at an appropriate distance behind the first, yielding a substantial energy gain of the witness bunch particles. This puts very special demands on the machine providing the particle beam. In this article, we use simulations to show that, if driver-witness-bunches can be generated in the photocathode electron gun, the MAX IV Linear Accelerator could be used for plasma-wakefield acceleration.
|
|
| 7. |
|
|
| 8. |
|
|
| 9. |
|
|
| 10. |
|
|
| 11. |
|
|
| 12. |
|
|
| 13. |
- Cutic, Nino, et al.
(author)
-
Vacuum ultraviolet circularly polarized coherent femtosecond pulses from laser seeded relativistic electrons
- 2011
-
In: Physical Review Special Topics. Accelerators and Beams. - 1098-4402. ; 14:3
-
Journal article (peer-reviewed)abstract
- We have demonstrated the generation of circularly polarized coherent light pulses at 66 nm wavelength by combining laser seeding at 263 nm of a 375 MeV relativistic electron bunch with subsequent coherent harmonic generation from an elliptical undulator of APPLE-II type. Coherent pulses at higher harmonics in linear polarization have been produced and recorded up to the sixth order (44 nm). The duration of the generated pulses depends on the temporal overlap of the initial seed laser pulse and the electron bunch and was on the order of 200 fs. Currently, this setup is the only source worldwide producing coherent fs-light pulses with variable polarization in the vacuum ultraviolet.
|
|
| 14. |
- Dahlström, Marcus, et al.
(author)
-
Atomic and macroscopic measurements of attosecond pulse trains
- 2009
-
In: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 80:3
-
Journal article (peer-reviewed)abstract
- We characterize attosecond pulses in a train using both the well established "reconstruction of attosecond beating by interference of two-photon transitions" (RABITT) technique and the recently demonstrated in situ method, which is based on a weak perturbation of the harmonic generation process by the second harmonic of the laser field. The latter technique determines the characteristics of the single atom emission, while RABITT allows one to measure attosecond pulses "on target." By comparing the results of the two methods, the influence of propagation and filtering on the attosecond pulses can be extracted.
|
|
| 15. |
- Erny, Christian, et al.
(author)
-
Metrology of high-order harmonics for free-electron laser seeding
- 2011
-
In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 13
-
Journal article (peer-reviewed)abstract
- We examine the characteristics of high-order harmonics generated with 800 nm, 25 mJ, 160 fs laser pulses in an Ar gas cell with the objective of seeding a free electron laser. We measure the energy per pulse and per harmonic, the energy jitter, the divergence and the position stability of the harmonic beam. We perform ab initio numerical simulations based on integration of the time-dependent Schrodinger equation and of the wave equation within the slowly varying envelope approximation. The results reproduce the experimental measurements to better than a factor of two. The interaction of a frequency comb of harmonic fields with an electron bunch in an undulator is examined with a simple model consisting of calculating the energy modulation owing to the seed-electron interaction. The model indicates that the undulator acts as a spectral filter selecting a given harmonic.
|
|
| 16. |
- Johnsson, Per, et al.
(author)
-
Trains of attosecond electron wave packets
- 2006
-
In: Journal of Modern Optics. - : Informa UK Limited. - 0950-0340 .- 1362-3044. ; 53:1-2, s. 233-245
-
Journal article (peer-reviewed)abstract
- We study temporally localized electron wave packets, generated using a train of extreme ultraviolet (XUV) attosecond pulses to ionize the target atoms. Both the electron wave packets and the attosecond pulse train ( APT) are characterized using the same technique, based on interference of two-photon transitions in the continuum. We study, in particular, the energy transfer from a moderately strong infrared (IR) field to the electron wave packets as a function of time delay between the XUV and the IR fields. The use of an APT to generate the electron wave packets enables the generation at times not accessible through tunneling ionization. We find that a significant amount of energy is transferred from the IR field to the electron wave packets, when they are generated at a zero-crossing of the IR laser field. This energy transfer results in a dramatically enhanced above-threshold ionization even at IR intensities that alone are not strong enough to induce any significant ionization.
|
|
| 17. |
- Mansten, Erik, et al.
(author)
-
Broadband attosecond pulse shaping
- 2007
-
In: Optics Letters. - 0146-9592. ; 32:11, s. 1353-1355
-
Journal article (peer-reviewed)abstract
- We use semiconductor (Si) and metallic (Al, Zr) transmission filters to shape, in amplitude and phase, high-order harmonics generated from the interaction of an intense titanium sapphire laser field with a pulsed neon gas target. Depending on the properties of the filter, the emitted attosecond pulses can be optimized in bandwidth and/or pulse length. We demonstrate the generation of attosecond pulses centered at energies from 50 to 80 eV, with bandwidths as large as 45 eV and with pulse durations compressed to 130 as. (c) 2007 Optical Society of America.
|
|
| 18. |
- Mansten, Erik, et al.
(author)
-
Cancellation of klystron-induced energy and arrival-time variations in linear accelerators with arc-type bunch compressors
- 2024
-
In: Physical Review Accelerators and Beams. - 2469-9888. ; 27:4
-
Journal article (peer-reviewed)abstract
- We explain how the accelerating field amplitude and phase vary with modulator voltage in pulsed radio frequency high-power amplifiers based on klystron tubes. Changes in modulator voltage give rise to correlated changes of amplitude and phase, affecting the properties of the accelerated beam, in particular energy, arrival time, and bunch duration. We show, both theoretically and experimentally, that there exists a postcrest acceleration phase (the magic angle) where the changes of beam energy due to phase and amplitude shifts caused by modulator-voltage variations cancel out. When accelerating at the magic angle, the klystron modulator voltage jitter no longer contributes to energy and arrival-time jitter in the accelerator. Off-crest operation at the magic angle can be implemented for bunch compression schemes in accelerators with arc-type bunch compressors, which have positive momentum compaction. The experimental results, obtained at the MAX IV laboratory, show the benefit of operating close to the magic angle in arc-type bunch compressors. In a direct measurement of normalized electron-energy jitter, the energy jitter was reduced by a factor of 1.8 down to 8.2×10-5 when operating at the magic angle.
|
|
| 19. |
- Mansten, Erik
(author)
-
Measurement and Control of Attosecond Light Fields
- 2009
-
Doctoral thesis (other academic/artistic)abstract
- Attosecond pulses are used to study electron dynamics in atoms and molecules. In this thesis, schemes to control the generation of attosecond pulses and pulse-shaping techniques to compress the pulses are presented. Generation of attosecond pulses requires high intensity, which is reached by focusing a pulsed femtosecond laser. The emitted pulses come isolated or in an attosecond pulse train (APT), depending on the duration of the driving field. In several experiments, we have controlled the pulse repetition rate in the APT by adding the second harmonic to the driving field. An APT with one pulse per cycle of the driving field is then generated, instead of a train with two pulses per cycle, which is the case for a one-color field. A rather strong second harmonic changes the shape of the generating field, which leads to a tunable central photon energy of the attosecond pulses. With a short driving field an APT containing few pulses is generated. The spectrum of a short APT shows additional interference structures. In analogy with multi-slit interference, these structures are secondary maxima, positioned in between the principal maxima. The number of secondary maxima is related to the number of pulses in the APT. Attosecond pulses are emitted by a macroscopic medium. How the macroscopic conditions affect the pulse duration has also been studied. Directly after the generation the attosecond pulses have, in general, a relatively long pulse duration. Spectral filtering is important to shape the spectrum and compress the pulses. We have used thin transmission filters and multi-layer XUV-mirrors for filtering. We measured a pulse duration of 130 as, for attosecond pulses generated in Ne and filtered by Zr. Most schemes to characterize attosecond pulses are based on a cross-correlation with an IR field. We have used the RABITT (reconstruction of attosecond beating by interference of two-photon transitions) and the AC-streak camera techniques, capable of measuring different types of APT:s. Finally, attosecond pulses have been used in two application experiments: Momentum shearing interferometry; and the Quantum stroboscope, where electron scattering off the atomic potential was observed.
|
|
| 20. |
- Mansten, Erik, et al.
(author)
-
Spectral shaping of attosecond pulses using two-colour laser fields
- 2008
-
In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 10
-
Journal article (peer-reviewed)abstract
- We use a strong two-colour laser field composed of the fundamental (800 nm) and the second harmonic (400 nm) of an infrared (IR) laser field to generate attosecond pulses with controlled spectral and temporal properties. With a second-harmonic intensity equal to 15% of the IR intensity the second-harmonic field is strong enough to significantly alter and control the electron trajectories in the generation process. This enables us to tune the central photon energy of the attosecond pulses by changing the phase difference between the IR and the second-harmonic fields. In the time domain the radiation is emitted as a sequence of pulses separated by a full IR cycle. We also perform calculations showing that the effect of even stronger second-harmonic fields leads to an extended tunable range under conditions that are experimentally feasible.
|
|
| 21. |
- Mansten, Erik, et al.
(author)
-
Spectral signature of short attosecond pulse trains.
- 2009
-
In: Physical Review Letters. - 1079-7114. ; 102:8
-
Journal article (peer-reviewed)abstract
- We report experimental measurements of high-order harmonic spectra generated in Ar using a carrier-envelope-offset (CEO) stabilized 12 fs, 800 nm laser field and a fraction (less than 10%) of its second harmonic. Additional spectral peaks are observed between the harmonic peaks, which are due to interferences between multiple pulses in the train. The position of these peaks varies with the CEO and their number is directly related to the number of pulses in the train. An analytical model, as well as numerical simulations, support our interpretation.
|
|
| 22. |
- Mauritsson, Johan, et al.
(author)
-
Attosecond pulse trains generated using two color laser fields
- 2006
-
In: Physical Review Letters. - 1079-7114. ; 97:1
-
Journal article (peer-reviewed)abstract
- We investigate the spectral and temporal structure of high harmonic emission from argon exposed to an infrared laser field and its second harmonic. For a wide range of generating conditions, trains of attosecond pulses with only one pulse per infrared cycle are generated. The synchronization necessary for producing such trains ensures that they have a stable pulse-to-pulse carrier envelope phase, unlike trains generated from one color fields, which have two pulses per cycle and a pi phase shift between consecutive pulses. Our experiment extends the generation of phase stabilized few cycle pulses to the extreme ultraviolet regime.
|
|
| 23. |
- Mauritsson, Johan, et al.
(author)
-
Coherent electron scattering captured by an attosecond quantum stroboscope.
- 2008
-
In: Physical Review Letters. - 1079-7114. ; 100:7
-
Journal article (peer-reviewed)abstract
- We demonstrate a quantum stroboscope based on a sequence of identical attosecond pulses that are used to release electrons into a strong infrared (IR) laser field exactly once per laser cycle. The resulting electron momentum distributions are recorded as a function of time delay between the IR laser and the attosecond pulse train using a velocity map imaging spectrometer. Because our train of attosecond pulses creates a train of identical electron wave packets, a single ionization event can be studied stroboscopically. This technique has enabled us to image the coherent electron scattering that takes place when the IR field is sufficiently strong to reverse the initial direction of the electron motion causing it to rescatter from its parent ion.
|
|
| 24. |
- Mauritsson, Johan, et al.
(author)
-
Laserteknik berättar elektronernas dramatik
- 2010
-
In: Fysikaktuellt. - 0283-9148. ; :4, s. 10-10
-
Journal article (pop. science, debate, etc.)abstract
- Attofysik handlar om att öppna ögonen för en värld som vi länge vetat fanns men fram till nu inte har kunnat se – elektronernas värld. En värld av ofattbart små och snabba förlopp och fenomen. Utvecklingen av lasertekniken har kommit så långt att vi faktiskt har möjlighet att studera den världen.
|
|
| 25. |
- Mauritsson, Johan, et al.
(author)
-
Sub-cycle control of attosecond pulse generation using two-colour laser fields
- 2009
-
In: Journal of Physics B-Atomic Molecular and Optical Physics. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 42:13
-
Conference paper (peer-reviewed)abstract
- Strong field laser-matter interaction is intrinsically a sub-cycle phenomenon, which is clearly illustrated by the generation of attosecond pulses through the high-order harmonic process. Therefore, to control strong field processes the structure of the field driving the generation has to be controlled on a sub-cycle level. One approach is to use phase stabilized few-cycle driving pulses and vary the carrier-envelope phase of these pulses; an alternative method is to use longer pulses and include the second harmonic to tailor the field structure.
|
|
| 26. |
- Morlens, AS, et al.
(author)
-
Design and characterization of extreme-ultraviolet broadband mirrors for attosecond science
- 2006
-
In: Optics Letters. - 0146-9592. ; 31:10, s. 1558-1560
-
Journal article (peer-reviewed)abstract
- A novel multilayer mirror was designed and fabricated based on a recently developed three-material technology aimed both at reaching reflectivities of about 20% and at controlling dispersion over a bandwidth covering photon energies between 35 and 50 eV. The spectral phase upon reflection was retrieved by measuring interferences in a two-color ionization process using high-order harmonics produced from a titanium: sapphire laser. We demonstrate the feasibility of designing and characterizing phase-controlled broadband optics in the extreme-ultraviolet domain, which should facilitate the manipulation of attosecond pulses for applications.
|
|
| 27. |
- Olsson, David, et al.
(author)
-
Transverse RF Deflecting Structures for the MAX IV LINAC
- 2018
-
In: JACoW Publishing. - 9783954501847 ; , s. 3684-3687
-
Conference paper (other academic/artistic)abstract
- The MAX IV LINAC operates both as a full-energy injector for two electron storage rings, and as a driver for a Short Pulse Facility (SPF). Recently a conceptual design report for a Soft X-ray Laser (SXL) beamline at the end of the existing LINAC was started. For SPF and SXL operation, it is important to characterize beam parameters such as bunch profile, slice energy spread and slice emittance. For these measurements, two 3 m long transverse deflecting RF structures with a matching section are being developed. The structures are operating at S-band and have variable polarizations. When fed via a SLED pulse compressor, the two structures can generate a total integrated deflecting voltage higher than 100 MV which is sufficient for measurements with temporal resolutions down to 1 fs. This paper describes the initial RF design of the deflecting structures.
|
|
| 28. |
- Qin, Weilun, et al.
(author)
-
The FEL in the SXL project at MAX IV
- 2021
-
In: Journal of Synchrotron Radiation. - : International Union Of Crystallography. - 1600-5775 .- 0909-0495. ; 28, s. 707-717
-
Journal article (peer-reviewed)abstract
- In this paper the design of the free-electron laser (FEL) in the SXL (Soft X-ray Laser) project at the MAX IV Laboratory is presented. The target performance parameters originate in a science case put forward by Swedish users and the SXL FEL is foreseen to be driven by the existing MAX IV 3 GeV linac. The SXL project is planned to be realized in different stages and in this paper the focus is on Phase 1, where the basic operation mode for the FEL will be SASE (self-amplified spontaneous emission), with an emphasis on short pulses. Simulation results for two linac bunches (high and low charge) with different pulse duration are illustrated, as well as the performance for two-color/two-pulses mode and power enhancement through tapering. Besides standard SASE and optical klystron configurations, the FEL setup is also tailored to allow for advanced seeding schemes operations. Finally possible upgrades that will be implemented in a second phase of the project are discussed.
|
|
| 29. |
- Remetter, Thomas, et al.
(author)
-
Attosecond electron wave packet interferometry
- 2006
-
In: Nature Physics. - : Springer Science and Business Media LLC. - 1745-2473 .- 1745-2481. ; 2:5, s. 323-326
-
Journal article (peer-reviewed)abstract
- A complete quantum-mechanical description of matter and its interaction with the environment requires detailed knowledge of a number of complex parameters. In particular, information about the phase of wavefunctions is important for predicting the behaviour of atoms, molecules or larger systems. In optics, information about the evolution of the phase of light in time(1) and space(2) is obtained by interferometry. To obtain similar information for atoms and molecules, it is vital to develop analogous techniques. Here we present an interferometric method for determining the phase variation of electronic wave packets in momentum space, and demonstrate its applicability to the fundamental process of single-photon ionization. We use a sequence of extreme-ultraviolet attosecond pulses(3,4) to ionize argon atoms and an infrared laser field, which induces a momentum shear(5) between consecutive electron wave packets. The interferograms that result from the interaction of these wave packets provide useful information about their phase. This technique opens a promising new avenue for reconstructing the wavefunctions(6,7) of atoms and molecules and for following the ultrafast dynamics of electronic wave packets.
|
|
| 30. |
- Ruchon, Thierry, et al.
(author)
-
Macroscopic effects in attosecond pulse generation
- 2008
-
In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 10
-
Journal article (peer-reviewed)abstract
- We examine how the generation and propagation of high-order harmonics in a partly ionized gas medium affect their strength and synchronization. The temporal properties of the resulting attosecond pulses generated in long gas targets can be significantly influenced by macroscopic effects, in particular by the intensity in the medium and the degree of ionization which control the dispersion. Under some conditions, the use of gas targets longer than the absorption length can lead to the generation of compressed attosecond pulses. We show these macroscopic effects experimentally, using a 6 mm-long argon-filled gas cell as the generating medium.
|
|
| 31. |
- Ruchon, Thierry, et al.
(author)
-
Momentum shearing interferometry of electron waves
- 2007
-
In: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 1996-756X .- 0277-786X. ; 6460, s. 4600-4600
-
Conference paper (peer-reviewed)abstract
- We analyse recent experiments on momentum shearing interferometry of electron wave packets1,2 by using an optical analogy with shearing interferometry for optical waves. This analogy offers a convenient point of view to discuss the capabilities and difficulties of this technique used to access the phase of electron wave packets.
|
|
| 32. |
- Rudawski, Piotr, et al.
(author)
-
A high-flux high-order harmonic source.
- 2013
-
In: Review of Scientific Instruments. - : AIP Publishing. - 1089-7623 .- 0034-6748. ; 84:7
-
Journal article (peer-reviewed)abstract
- We develop and implement an experimental strategy for the generation of high-energy high-order harmonics (HHG) in gases for studies of nonlinear processes in the soft x-ray region. We generate high-order harmonics by focusing a high energy Ti:Sapphire laser into a gas cell filled with argon or neon. The energy per pulse is optimized by an automated control of the multiple parameters that influence the generation process. This optimization procedure allows us to obtain energies per pulse and harmonic order as high as 200 nJ in argon and 20 nJ in neon, with good spatial properties, using a loose focusing geometry (f#≈400) and a 20 mm long medium. We also theoretically examine the macroscopic conditions for absorption-limited conversion efficiency and optimization of the HHG pulse energy for high-energy laser systems.
|
|
| 33. |
|
|
| 34. |
- Svensson, Jonas Bjorklund, et al.
(author)
-
Beamline design for plasma-wakefield acceleration experiments at MAX IV
- 2019
-
In: 2018 IEEE Advanced Accelerator Concepts Workshop, ACC 2018 - Proceedings. - 9781538677216
-
Conference paper (peer-reviewed)abstract
- The MAX IV Laboratory is a synchrotron radiation user facility located just outside the city of Lund, Sweden. The facility is made up of two storage rings, at 3 GeV and 1.5 GeV, respectively, and a linear accelerator, serving as a full-energy injector for the rings as well as a driver for the Short-Pulse Facility (SPF) located downstream of the extraction point to the 3 GeV ring. Recently, as part of the Soft X-ray Laser (SXL) project, a design study towards using the linac as a soft X-ray free-electron laser (FEL) driver was started. Part of the study is the design and commissioning of a diagnostics beamline based on a Transverse Deflecting Structure (TDS). Moreover, the PlasMAX collaboration is working towards using the MAX IV linac also for beam-driven plasma-wakefield (PWFA) experiments. Therefore, the design of the diagnostics beamline is being done to also accommodate an interaction chamber and final focusing, located upstream of the TDS. This proceeding details the current status of the beamline design and shows some preliminary single- A nd double-bunch current measurements.
|
|
| 35. |
|
|
| 36. |
- Thorin, Sara, et al.
(author)
-
Experience and initial measurements of magnetic linearisation in the MAX IV linac bunch compressors
- 2017
-
In: Proceedings of FEL2017, Santa Fe, NM, USA. - 9783954501793 ; , s. 273-275
-
Conference paper (other academic/artistic)abstract
- The MAX IV Linac is now in routine operation for injection into two storage rings, and as a high-brightness driver for a Short Pulse Facility (SPF). In short-pulse mode the electron bunch is created in a photo cathode gun and compressed in two double achromat bunch compressors that also linearise longitudinal phase space with the second order transfer matrix element T566. T566 in the compressors canbe tweaked with weak sextupoles located at high dispersion. In this paper we present the current experience from operating the bunch compressors at MAX IV and results from initial measurements of longitudinal phase space using our version of the the zero-crossing method.
|
|
| 37. |
- Thorin, Sara, et al.
(author)
-
Status of MAX IV linac beam commissioning and performance
- 2017
-
In: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 ; , s. 1547-1549
-
Conference paper (peer-reviewed)abstract
- The MAX IV linac is used both for injection into a 3 GeV storage ring, and as a high brightness driver for a Short Pulse Facility (SPF). It has also been deigned to handle the high demands of an FEL injector. The linac is now routinely injecting into the two storagerings, and commissioning work is focused towards delivering high brightness pulses to the SPF. In this paper we present results from characterisation of the linac in ring injection mode, as well as results from measurements of key parameters for the SPF such as bunch length and emittance.
|
|
| 38. |
|
|
| 39. |
- Varju, Katalin, et al.
(author)
-
Reconstruction of attosecond pulse trains using an adiabatic phase expansion
- 2005
-
In: Physical Review Letters. - 1079-7114. ; 95:24
-
Journal article (peer-reviewed)abstract
- We propose a new method to reconstruct the electric field of attosecond pulse trains. The phase of the high-order harmonic emission electric field is Taylor expanded around the maximum of the laser pulse envelope in the time domain and around the central harmonic in the frequency domain. Experimental measurements allow us to determine the coefficients of this expansion and to characterize the radiation with attosecond accuracy over a femtosecond time scale. The method gives access to pulse-to-pulse variations along the train, including the timing, the chirp, and the attosecond carrier envelope phase.
|
|
| 40. |
|
|
| 41. |
|
|
