Performance of achromatic lattice with combined function sextupoles at Duke Storage Ring

Litvinenko, V.N.; Wu, Y.; Burnham, B.; Madey, J. M. J.; Park, S.H.

doi:10.1109/pac.1995.504795

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…The somewhat larger discrepancy between the measurement and simulation in the vertical natural chromaticity is likely the result of employing combined function quadru-sextupoles in the real storage ring which are also used as weak dipole magnets with a large reference orbit displacement in these magnets [36,37]. In Fig.…”

Section: Scaling the Settings Of Dipoles And Quadrupolesmentioning

confidence: 94%

“…These slope values are close to the natural chromaticity values from a design lattice which uses only separate-function magnets ξ x ≈ -9.8 and ξ y ≈ -9.5. The somewhat larger discrepancy in the vertical natural chromaticity is likely the result of employing combined function quadru-sextupoles in the real storage ring which are also used as weak dipole magnets with a large orbit displacement in these magnets [35,36]. In Fig.…”

Section: Scaling the Settings Of Dipoles And Quadrupolesmentioning

confidence: 99%

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Study of magnetic hysteresis effects in a storage ring using precision tune measurement

Hao

Mikhailov

et al. 2016

Chinese Phys. C

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With advances in accelerator science and technology in the recent decades, the accelerator community has focused on the development of next-generation light sources, for example the diffraction-limited storage rings (DLSRs), which requires precision control of the electron beam energy and betatron tunes. This work is aimed at understanding magnet hysteresis effects on the electron beam energy and lattice focusing in the circular accelerators, and developing new methods to gain better control of these effects. In this paper, we will report our recent experimental study of the magnetic hysteresis effects and their impacts on the Duke storage ring lattice using the transverse feedback based precision tune measurement system. The major magnet hysteresis effects associated with magnet normalization and lattice ramping are carefully studied to determine an effective procedure for lattice preparation while maintaining a high degree of reproducibility of lattice focusing. The local hysteresis effects are also studied by measuring the betatron tune shifts resulted from adjusting the setting of a quadrupole. A new technique has been developed to precisely recover the focusing strength of the quadrupole by returning it to a proper setting to overcome the local hysteresis effect.

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Section: Scaling the Settings Of Dipoles And Quadrupolesmentioning

confidence: 94%

Section: Scaling the Settings Of Dipoles And Quadrupolesmentioning

confidence: 99%

Study of magnetic hysteresis effects in a storage ring using precision tune measurement

Hao

Mikhailov

et al. 2016

Chinese Phys. C

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“…The arc lattice is comprised of ten FODO cells, including eight regular cells and one modified cell at each end [13]. Due to the space limitation, the sextupole magnets were removed from the original design in the arc, and the sextupole magnetic fields were realized by shifting the magnetic centers of the quadrupole magnets horizontally inward by about 2.5 mm [16]. Consequently, this arrangement makes the electron beam have a large horizontal offset at the locations of the arc BPM pickups, causing them to have a significant nonlinear response to the beam orbit offset.…”

Section: The Duke Storage Ring Bpm Systemmentioning

confidence: 99%

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

Huang

et al. 2014

Chinese Phys. C

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The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers (FELs), and the High Intensity Gamma-ray Source (HIGS). It is operated with a beam current ranging from about 1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors (BPMs) are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations.

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“…The circumstances leading to the design of the ring's novel modified second-order achromatic lattice is presented elsewhere [3]. Our experience with the Duke storage ring has shown that this lattice is very "tolerant".…”

Section: Introductionmentioning

confidence: 99%

Commissioning of the Duke Storage Ring

Litvinenko

Burnham

et al.

Proceedings Particle Accelerator Conference

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The commissioning of the 1 GeV Duke Storage Ring began in November, 1994 with the demonstration of injection, storage and ramping to 1 GeV at the fwst attempt. The ring is now operational. The Duke project is unique in that the storage ring and linac were designed, constructed and commissioned by a small new University laboratory, operating on a low budget. The team is comprised of six accelerator physicists and graduate students, eight engineers, and fifteen technicians. DUKE FEL STORAGE RING70 cm C/4 = 26865 m C/4 = 26.865 m ~ I Orbit Circumference, C=l07.46 m Figure 1. Layout of the Duke FEL storage ring and 280 MeV linac-injector.

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Performance of achromatic lattice with combined function sextupoles at Duke Storage Ring

Cited by 11 publications

References 3 publications

Study of magnetic hysteresis effects in a storage ring using precision tune measurement

Study of magnetic hysteresis effects in a storage ring using precision tune measurement

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

Commissioning of the Duke Storage Ring

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