| 1. |
- Leemann, Simon, et al.
(författare)
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MAX IV Emittance Reduction and Brightness Improvement
- 2014
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Ingår i: Proceedings of IPAC’14. - 9783954501151 ; , s. 1615-1617
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Konferensbidrag (refereegranskat)abstract
- With MAX IV construction well underway and beam commissioning expected to commence in July 2015, first studies have been launched on improving the optics of the MAX IV 3 GeV storage ring with the goal of further reducing the emittance from the baseline design (320 pm rad) towards 150 pm rad while improving the matching of the electron beam to insertion devices to further improve the resulting photon brightness. We report on progress in the development of this new optics as well as studies of the impact of many strong insertion devices on beam emittance. The latter is an crucial issue in ultralow-emittance rings where dipole radiation losses are low and hence the equilibrium emittance is determined to large extent by the insertion devices. Additionally, large stored current can lead to a significant increase of emittance via strong intrabeam scattering in both transverse and longitudinal planes. Hence, the anticipated insertion devices, stored bunch current, and RF cavity tuning all have to be taken into account when optimizing for highest brightness. We present initial results and sketch a path towards a first MAX IV upgrade.
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| 2. |
- Leemann, Simon
(författare)
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Recent Progress on the MAX IV 1.5 GeV Storage Ring Lattice and Optics
- 2012
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Ingår i: Proceedings of IPAC’12. - 9783954501151 ; , s. 1662-1664
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Konferensbidrag (refereegranskat)abstract
- Construction of the MAX IV facility started in 2010 and commissioning is expected to begin in 2014. Once com- pleted, the facility will include two storage rings for the production of synchrotron radiation. The 3 GeV ring will house insertion devices for the production of x-rays, while the 1.5 GeV ring will serve UV and IR users. Recently, the lattice and optics of the 1.5 GeV storage ring have been modified as a result of detailed magnet and vacuum system design. This paper discusses the lattice and optics changes as well as their effects.
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| 3. |
- Olsson, Teresia, et al.
(författare)
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High-chromaticity Optics for the MAX IV 1.5 GeV Storage Ring
- 2014
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Ingår i: Proceedings of IPAC’14. - 9783954501151 ; , s. 3053-3055
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The MAX IV facility currently under construction in Lund, Sweden will include a 1.5 GeV storage ring. To prevent head-tail instability, the negative natural chromaticities of the MAX IV 1.5 GeV storage ring have been corrected to positive values using sextupole gradients in the focusing quadrupoles along with dedicated sextupole magnets. To allow adjustment of the chromaticity correction, weak correction sextupoles have been inserted into the lattice. A high-chromaticity optics has been developed for the MAX IV 1.5 GeV storage ring in case instability issues arise during commissioning. Two chromatic sextupole families were used to correct the linear chromaticity. The tune footprint was then tailored using the remaining two sextupole families with the goal of maximizing dynamic aperture and Touschek lifetime. This paper describes the recently developed high-chromaticity optics for the MAX IV 1.5 GeV storage ring and discusses performance limitations of the optics constrained by available gradient strength in the sextupoles.
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| 4. |
- Persson, Tobias, 1985, et al.
(författare)
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Beam Stability at CTF3
- 2012
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Ingår i: IPAC 2012 - International Particle Accelerator Conference 2012. - 9783954501151 ; , s. 1888-1890
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Konferensbidrag (refereegranskat)abstract
- The two-beam acceleration tested at CTF3 imposes verytight tolerances on the drive beam stability. A descriptionof the specialized monitoring tool developed to identify thedrifts and jitter in the machine is presented. It compares all the relevant signals in an on-line manner to help the operator to identify drifts and to log data for off-line analysis. The main sources for the drifts of the drive beam have been identified and their causes are described. A feedback applied to the RF was implemented to reduce the effects. It works by changing the waveform for the pulse compression to compensate for the drifts.
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| 5. |
- Wawrzyniak, Adriana, et al.
(författare)
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Solaris Storage Ring Lattice Optimization with Strong Insertion Devices
- 2012
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Ingår i: Proceedings of IPAC’12. - 9783954501151 ; , s. 1218-1220
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Konferensbidrag (refereegranskat)abstract
- The Solaris synchrotron radiation facility under construction in Krakow will be a replica of the 1.5 GeV storage ring of MAX IV. This compact 3rd generation light source has been designed to have an emittance of 6 nm rad and operate with 500 mA stored current for VUV and and soft X-ray production.The lattice consists of 12 double- bend achromats (DBA) where each DBA cell is integrated into one solid iron block. Twelve 3.5 m long straight sections are available of which 10 will be equipped with various insertion devices. These devices will differ from those adopted by MAX IV. For X-ray production one or more superconducting wigglers will be used, while APPLE-II type undulators will be used for variable polarised light production. The linear and nonlinear beam dynamics have been studied with these perturbing insertion devices included in the lattice and results are presented in this paper.
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