Commissioning of the booster injector synchrotron for the HIGS facility at duke university

Mikhailov, S.; Busch, M.; Emamian, M.; Hartman, S.; Kim, Y.; Li, J.; Popov, V.; Swift, G.; Wallace, P.; Wang, P.; Wu, Y.; Howell, C. R.; Gavrilov, N.G.; Kurkin, G.Ya.; Matveev, Yu. A.; Anchugov, O. V.; Shvedov, D. A.; Винокуров, Н.А.

doi:10.1109/pac.2007.4441032

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…This is a very challenging task for this unusually compact booster with highly saturated magnets. Substantial effort has been devoted to developing an elaborate tune compensation scheme for the entire energy range of booster operation [1]. This compensation scheme was implemented in the low level controls of the EPICS based control system [5].…”

Section: Fast Tune Measurement Systemmentioning

confidence: 99%

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A tune measurement system for low current and energy ramping operation of a booster synchrotron

Popov

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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A betatron tune measurement system is one of the most important diagnostic tools for any circular accelerator. For the commissioning of a booster synchrotron newly developed for top-off injection into the Duke storage ring, a versatile tune measurement system employing a network analyzer, a short stripline kicker, a space filter and a photomultiplier tube has been developed to allow tune measurements over a wide range of beam energies from 0.24 to 1.2 GeV, and for low current measurements at a few micro-amperes. The signal from the highly sensitive optical detection system is also used for fast tune measurements with a realtime oscilloscope. This technique is being developed for live tune monitoring during booster energy ramping.

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Section: Fast Tune Measurement Systemmentioning

confidence: 99%

“…In order to supply electrons continuously during high energy gamma production in the electron loss-mode, a 0.24-1.2 GeV booster synchrotron has been developed and successfully commissioned in 2006 [1]. This new injector is a very compact synchrotron with a circumference of 31.9 m and a maximum dipole field of 1.76 Tesla at 1.2 GeV.…”

Section: Introductionmentioning

confidence: 99%

A tune measurement system for low current and energy ramping operation of a booster synchrotron

Popov

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…It provides a very high intensity gamma-ray beam with switchable polarization in the energy range from 1 MeV to 100 MeV. The HIGS facility consists of three accelerators: a linac pre-injector (0.16 GeV), a booster injector (0.16-1.2 GeV), and an electron storage ring (0.24-1.2 GeV) [1,2], as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Compensation for booster leakage field in the Duke storage ring

Hao

Mikhailov

et al. 2017

Chinese Phys. C

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The High Intensity Gamma-ray Source (HIGS) at Duke University is an accelerator-driven Compton gamma-ray source, providing high flux gamma-ray beam from 1 MeV to 100 MeV for photo-nuclear physics research. The HIGS facility operates three accelerators, a linac pre-injector (0.16 GeV), a booster injector (0.16-1.2 GeV), and an electron storage ring (0.24-1.2 GeV). Because of proximity of the booster injector to the storage ring, the magnetic field of the booster dipoles close to the ring can significantly alter the closed orbit in the storage ring being operated in the low energy region. This type of orbit distortion can be a problem for certain precision experiments which demand a high degree of the energy consistency of the gamma-ray beam. This energy consistency can be achieved by maintaining consistent aiming of the gamma-ray beam, therefore, a steady electron beam orbit and angle at the Compton collision point. To overcome the booster leakage field problem, we have developed an orbit compensation scheme. This scheme is developed using two fast orbit correctors and implemented as a feedforward which is operated transparently together with the slow orbit feedback system. In this paper, we will describe the development of this leakage field compensation scheme, and report the measurement results which have demonstrated the effectiveness of the scheme.

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“…In 2006, a major upgrade of the light source facility was completed. In the upgrade, a booster synchrotron was constructed as the full-energy injector of the storage ring [7]. In addition, the north straight section of the storage ring was overhauled for a new injection scheme and for hosting a new high-order mode (HOM) damped RF cavity [8,9].…”

Section: Introductionmentioning

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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Commissioning of the booster injector synchrotron for the HIGS facility at duke university

Cited by 12 publications

References 6 publications

A tune measurement system for low current and energy ramping operation of a booster synchrotron

A tune measurement system for low current and energy ramping operation of a booster synchrotron

Compensation for booster leakage field in the Duke storage ring

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

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