Initial electron-beam results from the DARHT-II linear induction accelerator

Ekdahl, C.A.; Abeyta, E.O.; Bender, H.; Broste, W.; Carlson, Carl A.; Caudill, L.D.; Chan, K.C.D.; Chen, Y.J.; Dalmas, Dale Allen; Durtschi, G.; Eversole, S.; Eylon, S.; Fawley, William M.; Frayer, Daniel K.; Gallegos, R.; Harrison, J.; Henestroza, E.; Holzscheiter, M. H.; Houck, T.; Hughes, T.P.; Humphries, S.; Johnson, Douglas E.; Johnson, J. B.; Jones, Kevin C.; Jacquez, E.; McCuistian, B.T.; Meidinger, A.; Montoya, N.; Mostrom, C. B.; Moy, K.; Nielsen, K.; Oró, D.; Rodríguez, Luis Rouco; Rodriguez, P.; Sanchez, M.; Schauer, Martin; Simmons, D.; Smith, H. Vernon; Studebaker, J.; Sturgess, R.; Sullivan, G. W.; Swinney, C.; Temple, R.; Tom, C.Y.; Yu, S.S.

doi:10.1109/tps.2005.845115

Cited by 30 publications

(17 citation statements)

References 14 publications

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“…Noninvasive DARHT-II beam diagnostics, such as beam position monitors (BPMs), were used on every shot [2,3]. BPMs were located throughout the injector, accelerator, and DST.…”

Section: Theory and Experimental Control Of Beam Motionmentioning

confidence: 99%

“…BPMs were located throughout the injector, accelerator, and DST. BPMs separated by $5 m throughout the accelerator measure current and position, while the BPMs after the exit had the eight detectors required to also provide unequivocal ellipticity measurements [2,10]. Most of the 12 BPMs in the downstream transport had eight detectors for ellipticity measurements because of the quadrupole magnets used for DST transport.…”

Section: Theory and Experimental Control Of Beam Motionmentioning

confidence: 99%

“…Invasive diagnostics were only occasionally used. These included a magnetic spectrometer to measure beam-electron kinetic energy, and time-resolved imaging of the beam current profile using Cerenkov emitters [1,2,4,11]. Once the tune of the magnetic focusing and steering has been set, the beam is very reproducible.…”

Section: Theory and Experimental Control Of Beam Motionmentioning

confidence: 99%

“…As shown in Fig. 6 the diode beam source is at right angles to the coaxial current feed from the Marx generator [1][2][3]. This asymmetry, and the resulting current path (Fig.…”

Section: B Suppression Of Low-frequency Beam Sweepmentioning

confidence: 99%

“…The Axis-II LIA, the beam it produces, and its solenoidal focusing are further described in Refs. [1][2][3]. After the long pulse exits the accelerator it passes through a kicker, which slices out shorter pulses to be transported to the bremsstrahlung converter target.…”

Section: Introductionmentioning

confidence: 99%

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Suppressing beam-centroid motion in a long-pulse linear induction accelerator

Ekdahl

Abeyta

Archuleta

et al. 2011

Phys. Rev. ST Accel. Beams

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The second axis of the dual-axis radiography of hydrodynamic testing (DARHT) facility produces up to four radiographs within an interval of 1:6 s. It does this by slicing four micropulses out of a 2-s long electron beam pulse and focusing them onto a bremsstrahlung converter target. The 1.8-kA beam pulse is created by a dispenser cathode diode and accelerated to more than 16 MeV by the unique DARHT Axis-II linear induction accelerator (LIA). Beam motion in the accelerator would be a problem for multipulse flash radiography. High-frequency motion, such as from beam-breakup (BBU) instability, would blur the individual spots. Low-frequency motion, such as produced by pulsed-power variation, would produce spot-to-spot differences. In this article, we describe these sources of beam motion, and the measures we have taken to minimize it. Using the methods discussed, we have reduced beam motion at the accelerator exit to less than 2% of the beam envelope radius for the high-frequency BBU, and less than 1=3 of the envelope radius for the low-frequency sweep.

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“…Noninvasive DARHT-II beam diagnostics, such as beam position monitors (BPMs), were used on every shot [2,3]. BPMs were located throughout the injector, accelerator, and DST.…”

Section: Theory and Experimental Control Of Beam Motionmentioning

confidence: 99%

Section: Theory and Experimental Control Of Beam Motionmentioning

confidence: 99%

Section: Theory and Experimental Control Of Beam Motionmentioning

confidence: 99%

“…As shown in Fig. 6 the diode beam source is at right angles to the coaxial current feed from the Marx generator [1][2][3]. This asymmetry, and the resulting current path (Fig.…”

Section: B Suppression Of Low-frequency Beam Sweepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Suppressing beam-centroid motion in a long-pulse linear induction accelerator

Ekdahl

Abeyta

Archuleta

et al. 2011

Phys. Rev. ST Accel. Beams

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View full text Add to dashboard Cite

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Aliasing errors in measurements of beam position and ellipticity

Ekdahl

2005

Review of Scientific Instruments

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Beam position monitors (BPMs) are used in accelerators and ion experiments to measure currents, position, and azimuthal asymmetry. These usually consist of discrete arrays of electromagnetic field detectors, with detectors located at several equally spaced azimuthal positions at the beam tube wall. The discrete nature of these arrays introduces systematic errors into the data, independent of uncertainties resulting from signal noise, lack of recording dynamic range, etc. Computer simulations were used to understand and quantify these aliasing errors. If required, aliasing errors can be significantly reduced by employing more than the usual four detectors in the BPMs. These simulations show that the error in measurements of the centroid position of a large beam is indistinguishable from the error in the position of a filament. The simulations also show that aliasing errors in the measurement of beam ellipticity are very large unless the beam is accurately centered. The simulations were used to quantify the aliasing errors in beam parameter measurements during early experiments on the DARHT-II accelerator, demonstrating that they affected the measurements only slightly, if at all.

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Quasianamorphic optical imaging system with tomographic reconstruction for electron beam imaging

Bender

Carlson

Frayer

et al. 2007

Review of Scientific Instruments

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We have developed a quasianamorphic optical tomography system coupled to a streak camera to provide continuous recording of the electron beam profile of an intense, long-pulse induction accelerator. A tomographic reconstruction method based on a maximum-entropy algorithm is used to reconstruct the images. The system has simplified the calculation of beam moments, eliminated ambiguity due to beam motion, and contributed to accelerator tuning.

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Initial electron-beam results from the DARHT-II linear induction accelerator

Cited by 30 publications

References 14 publications

Suppressing beam-centroid motion in a long-pulse linear induction accelerator

Suppressing beam-centroid motion in a long-pulse linear induction accelerator

Aliasing errors in measurements of beam position and ellipticity

Quasianamorphic optical imaging system with tomographic reconstruction for electron beam imaging

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