| 1. |
- Enquist, Henrik, et al.
(författare)
-
FemtoMAX - An X-ray beamline for structural dynamics at the short-pulse facility of MAX IV
- 2018
-
Ingår i: Journal of Synchrotron Radiation. - 0909-0495. ; 25:2, s. 570-579
-
Tidskriftsartikel (refereegranskat)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. |
|
|
| 3. |
- Björklund Svensson, Jonas, et al.
(författare)
-
Double-bunches for two-color soft X-ray free-electron laser at the MAX IV Laboratory
- 2018
-
Ingår i: Proceedings of FEL2017, Santa Fe, NM, USA. - 9783954501793 ; , s. 269-272
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)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.
|
|
| 4. |
- Björklund Svensson, Jonas, et al.
(författare)
-
Driver-witness-bunches for plasma-wakefield acceleration at the MAX IV Linear Accelerator
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 ; , s. 1743-1746
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)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.
|
|
| 5. |
- Olsson, David, et al.
(författare)
-
Transverse RF Deflecting Structures for the MAX IV LINAC
- 2018
-
Ingår i: JACoW Publishing. - 9783954501847 ; , s. 3684-3687
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)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.
|
|
| 6. |
- Svensson, Jonas Bjorklund, et al.
(författare)
-
Beamline design for plasma-wakefield acceleration experiments at MAX IV
- 2019
-
Ingår i: 2018 IEEE Advanced Accelerator Concepts Workshop, ACC 2018 - Proceedings. - 9781538677216
-
Konferensbidrag (refereegranskat)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.
|
|
| 7. |
|
|
| 8. |
- Thorin, Sara, et al.
(författare)
-
Experience and initial measurements of magnetic linearisation in the MAX IV linac bunch compressors
- 2017
-
Ingår i: Proceedings of FEL2017, Santa Fe, NM, USA. - 9783954501793 ; , s. 273-275
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)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.
|
|
| 9. |
- Thorin, Sara, et al.
(författare)
-
Status of MAX IV linac beam commissioning and performance
- 2017
-
Ingår i: IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. - 9783954501823 ; , s. 1547-1549
-
Konferensbidrag (refereegranskat)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.
|
|
