Status of the LIA-2. Double-pulse mode

Starostenko, D. A.; Akimov, Alexander V.; Bak, P. A.; Batazova, M. A.; Batrakov, A. M.; Boimelshtein, Y.; Bolkhovityanov, D. Yu.; Елисеев, А. А.; Корепанов, А. А.; Kuznetsov, G. I.; Kulenko, Ya.; Logatchev, P. V.; Ottmar, Andrey; Pavlenko, A. V.; Pavlov, O. A.; Panov, A. N.; Pachkov, A. A.; Fatkin, George; Akhmetov, A. R.; Kolesnikov, P. A.; Nikitin, O. A.; Петров, Д. В.

doi:10.1134/s1547477116070505

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…Linear induction accelerators (LIA) are widely used for radiographic investigation in different areas [1][2][3][4][5]. The principle of LIA radiography operation is as follows: a diode gun forms an electron beam which is accelerated in a transport channel and focused on the target by magnetic lens [6]. The Bremsstrahlung produced due to interaction of beam electrons with the target providing X-ray radiography of the object.…”

Section: Introductionmentioning

confidence: 99%

Technique for measuring of LIA spot size on target by X-rays propagating in beam backward direction

Kolesnikov¹,

Politov²,

Li³

et al. 2020

J. Inst.

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We are propose a technique for measuring of a focal spot size directly during the shot of a radiographic facility based on a linear induction accelerator. The key feature of the proposed method is the penumbral imaging in the direction backward to the electron beam propagation. Diagnostic has been installed in a backward hemisphere of the target chamber of a linear induction accelerator. It consists of two parallel edge-knife (roll-bars with 500 mm radius of curvature), a thin BGO scintillator, and a CCD camera with a 7 microseconds shutter. The performance and operability of the diagnostic was demonstrated on the linear induction accelerator with energy of electrons of 4 MeV. The first experimental results of the beam spot measurements are presented. A radiation transport modeling of the diagnostic scheme was performed using Monte-Carlo code PRIZMA. The effect of the scattered bremsstrahlung on the penumbral image in the backward direction was analyzed.

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Section: Introductionmentioning

confidence: 99%

Technique for measuring of LIA spot size on target by X-rays propagating in beam backward direction

Kolesnikov¹,

Politov²,

Li³

et al. 2020

J. Inst.

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“…Second, there must be a discontinuity within the accelerator walls such as accelerating gaps. This latter point makes the instability especially concerning for users of linear induction accelerators (LIAs) [4][5][6] and for present designers of new LIAs such as the Los Alamos National Laboratory, the Institute of Fluid Physics (China Academy of Engineering Physics) [7], and the Budker Institute of Nuclear Physics (Russian Academy of Sciences) [8].…”

Section: Introductionmentioning

confidence: 99%

Direct measurement of the image displacement instability in a linear induction accelerator

Burris-Mog

Ekdahl

Moir

2017

Phys. Rev. Accel. Beams

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The image displacement instability (IDI) has been measured on the 20 MeV Axis I of the dual axis radiographic hydrodynamic test facility and compared to theory. A 0.23 kA electron beam was accelerated across 64 gaps in a low solenoid focusing field, and the position of the beam centroid was measured to 34.3 meters downstream from the cathode. One beam dynamics code was used to model the IDI from first principles, while another code characterized the effects of the resistive wall instability and the beam breakup (BBU) instability. Although the BBU instability was not found to influence the IDI, it appears that the IDI influences the BBU. Because the BBU theory does not fully account for the dependence on beam position for coupling to cavity transverse magnetic modes, the effect of the IDI is missing from the BBU theory. This becomes of particular concern to users of linear induction accelerators operating in or near low magnetic guide fields tunes.

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“…A number of institutions, [2][3][4][5] such as the Los Alamos National Laboratory's Dual Axis Radiographic Hydrodynamic Test (DARHT) facility, 6 generate bremsstrahlung using a Linear Induction Accelerator (LIA), which accelerates electrons to relativistic energies before focusing them onto a high-Z converter target. The resulting bremsstrahlung then back lights an explosively driven test object to capture a stopped-motion image of the event.…”

Section: Introductionmentioning

confidence: 99%

Quantifying spot size reduction of a 1.8 kA electron beam for flash radiography

Burris-Mog

Moir

2018

Journal of Applied Physics

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The spot size of Axis-I at the Dual Axis Radiographic Hydrodynamic Test facility was reduced by 15.5% by including a small diameter drift tube that acts to aperture the outer diameter of the electron beam. Comparing the measured values to both analytic calculations and results from a particle-in-cell model shows that one-third to one-half of the spot size reduction is due to a drop in beam emittance. We infer that one-half to two-thirds of the spot-size reduction is due to a reduction in beam-target interactions. Sources of emittance growth and the scaling of the final focal spot size with emittance and solenoid aberrations are also presented.

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Status of the LIA-2. Double-pulse mode

Cited by 7 publications

References 4 publications

Technique for measuring of LIA spot size on target by X-rays propagating in beam backward direction

Technique for measuring of LIA spot size on target by X-rays propagating in beam backward direction

Direct measurement of the image displacement instability in a linear induction accelerator

Quantifying spot size reduction of a 1.8 kA electron beam for flash radiography

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