Diffraction and depths-of-field effects in electron beam imaging at SURF III

Arp, Uwe

doi:10.1016/s0168-9002(00)01328-0

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…This is equivalent to a FWHM of 400 mm. The FWHM horizontal and vertical beam sizes were found to be 2.1 mm by 0.026 mm, respectively, at 284.4 MeV [29]. This transverse beam size was determined by imaging the synchrotron radiation emitted by the electron beam onto a charged-coupled device camera, using a narrow band interference filter and taking into account diffraction and depth-of-field effects.…”

Section: Surf Storage Ringmentioning

confidence: 99%

Spontaneous coherent microwave emission and the sawtooth instability in a compact storage ring

Arp

Fraser

Hight-Walker

et al. 2001

Phys. Rev. ST Accel. Beams

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Strong evidence for self-excited emission of coherent synchrotron radiation in the microwave spectral region was observed at the Synchrotron Ultraviolet Radiation Facility (SURF III) electron storage ring at the NIST. The microwave emission between 25 and 35 mm was dominated by intense bursts of radiation. The intensity enhancement during these bursts was on the order of 10 000 to 50 000 over the incoherent value. The shape, width, and period of the bursts depend strongly on the operational parameters of the storage ring. Coherent microwave emission was observed only when the beam was unstable, namely, during bunch-length relaxation oscillations. We report on the measurements of the microwave bursts, and correlate the data with signals from a beam monitor electrode and photodiode detector. The coherent enhancement of the radiation intensity is ascribed to spontaneous self-induced microbunching of the electrons within the bunch.

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Section: Surf Storage Ringmentioning

confidence: 99%

Spontaneous coherent microwave emission and the sawtooth instability in a compact storage ring

Arp

Fraser

Hight-Walker

et al. 2001

Phys. Rev. ST Accel. Beams

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“…Finally, one has to consider the effect of the vertical size of the electron beam in the storage ring. At SURF III, the smallest vertical size of the electron beam is typically about 30 m (in full-width-half-max) [24]. Calculation shows that such a small size has a negligible difference as compared to that of a point source for our measurements in this work [25].…”

Section: Methodsmentioning

confidence: 79%

Absolute radiant flux measurement of the angular distribution of synchrotron radiation

Shaw

Arp

Lykke

2006

Phys. Rev. ST Accel. Beams

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We have measured the absolute radiant flux of synchrotron radiation as a function of the angle above and below the orbital plane with high accuracy at the Synchrotron Ultraviolet Radiation Facility (SURF III) at the National Institute of Standards and Technology (NIST), and the results were compared with theoretical calculations. The radiant flux of synchrotron radiation was measured at effective wavelengths of 256.5, 397.8, and 799.8 nm using three calibrated narrow-band filter radiometers with electron energies ranging from 180 to 380 MeV at SURF III. The filter radiometers were positioned inside a beamline with an unobstructed view of synchrotron radiation. The measured radiant flux agrees with theoretical Schwinger formulation to better than 0.5% for angles up to several milliradians.

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“…The transverse electron beam size and position at SURF is permanently monitored using an imaging system similar to the one described in Ref. 18. The synchrotron radiation emitted by the electrons stored in SURF is imaged using a spherical lens, narrow-band interference filter and a charge coupled device ͑CCD͒ camera.…”

Section: Beam Size Measurement and Controlmentioning

confidence: 99%

“…The software also adjusts the gain on the camera for full use of the dynamic range of the 8-bit frame grabber. Without manipulation the vertical beam cross section at SURF is very small, 18 resulting in very short electron beam lifetimes, limited by electron-electron scattering within the beam. To increase the lifetime the vertical betatron oscillation is excited.…”

Section: Beam Size Measurement and Controlmentioning

confidence: 99%

Synchrotron ultraviolet radiation facility SURF III

Arp¹,

Clark²,

Farrell³

et al. 2002

Review of Scientific Instruments

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The National Institute of Standards and Technology ͑NIST͒ has operated the Synchrotron Ultraviolet Radiation Facility ͑SURF͒ continuously since the early 1960s. The original accelerator was converted into a storage ring, called SURF II, in 1974. Then in 1998, motivated mainly by limitations in the accuracy of radiometric calibrations and the wish to extend the spectrum of the emitted synchrotron radiation to shorter wavelengths, a second major upgrade was performed. This time the whole magnet system was replaced to improve the calculability and allow for higher magnetic fields. Since the recommissioning of SURF III we have been working to improve the stability of the stored electron beam through modifications of the radio-frequency system, leading to operations with unprecedented stability and new record injection currents topping 700 mA.

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Diffraction and depths-of-field effects in electron beam imaging at SURF III

Cited by 10 publications

References 9 publications

Spontaneous coherent microwave emission and the sawtooth instability in a compact storage ring

Spontaneous coherent microwave emission and the sawtooth instability in a compact storage ring

Absolute radiant flux measurement of the angular distribution of synchrotron radiation

Synchrotron ultraviolet radiation facility SURF III

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