Low emittance foil diode studies for the recirculating linear accelerator (rla)

Mazarakis, M.G.; Poukey, J. W.; Haworth, M.D.; Smith, David L.; Hasti, D.E.; Pointon, T.D.; Bennett, L.F.; Lucero, Samuel J.

doi:10.1109/ppc.1989.767520

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…We propose a feasibility study to scientifically evaluate the idea of decoupling the anode converter from the cathode electron emitter, thus making the diode capable of producing more than one pulse. This work will be based on our vast experience in designing and fielding magnetically immersed foilles diodes [1][2][3][4][5][6][7][8][9][10] and specifically on two successful previous works we have accomplished: first, making a very small pencil-like beam in a magnetically immersed foilless diode [1,2,5]; and second, the successful demonstration of two-pulse operation of a foilles diode with the RIIM accelerator [3]. Our approach will combine the above experimentally demonstrated successful work.…”

Section: Technical Approach and Leading Edge Nature Of Workmentioning

confidence: 99%

Multi-pulse electron diode development for flash radiography

Mazarakis¹,

Cuneo²,

Hess³

et al. 2015

2015 IEEE Pulsed Power Conference (PPC)

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Presently the Self Magnetic Pinch (SMP) diode is successfully utilized for flash radiography with pulsed power drivers. However, it is not capable of more than one pulse. Multi-pulse single-axis radiography is most preferred since it provides images of time-evolving dynamic targets. In an SMP diode, because the anode cathode (A-K) gap is very small (~1-2 cm), the debris from the anode converter target arrives soon after the first pulse and completely destroy the cathode electron emitter, and thus the diode cannot produce a second pulse. We propose a feasibility study to scientifically evaluate the idea of decoupling the anode converter from the cathode electron emitter. This work will be based on two successful previous works we have accomplished: first, making a very small pencil-like beam in a magnetically immersed foilless diode (M .G. Mazarakis et al., Applied Physics Letters, 7, pp. 832 (1996)); and second, successfully demonstrating the two-pulse operation of a foilless diode with the RIIM accelerator (M. G. Mazarakis et al., Applied Physics 64 part I pp. 4815, (1988) Our approach will combine the above experimentally demonstrated successful work. The generated beam of 40-50 kA will be propagated in the same diode magnetic solenoid for a sufficient distance before striking the converter target. This way the diode could be multipulsed before the target debris reaches the cathode. Although the above describes the option of a foilless diode and a solenoidal transport system, a similar design could be made for a non-immersed low emittance 10 kA velvet emitter foilless diode.

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Section: Technical Approach and Leading Edge Nature Of Workmentioning

confidence: 99%

Multi-pulse electron diode development for flash radiography

Mazarakis¹,

Cuneo²,

Hess³

et al. 2015

2015 IEEE Pulsed Power Conference (PPC)

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Non-immersed apertured foilless diodes for the recirculating linear accelerator

Mazarakis¹,

Poukey²,

Platt³

et al. 1990

1990 Plasma Science IEEE Conference Record - Abstracts

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motion4 a n d controlling the t i m e d e p e n d e n t p a r a m e t e r s of t h e b e a m i n order t o optimize propagation of the b e a m i n full density air. R e s u l t s of experiments t o modify the b e a m p a r a m e t e r s a n d t h e i r effect of b e a m propagation i n full density a i r will be presented. *Work sponsored by t h e Defense Advanced Research ProjectsAgency a n d the Office of N a v a l Research 'Sachs Freeman Associates, Landover, MD 20785 "SAIC, McLean, V A 22101 'E.P. L e e a n d R.K. Cooper, P a r t . Accel. '7,83 (1976). ABSTRACTWe present here non-immersed apertured foilless diode designs developed for our Recirculating Linear Accelerator (RLA). They produce intense relativistic electron beams of low transverse velocities similar to those produced by our foil diode designs.' The anode foil is replaced by a four-range-thick anode plate with an aperture on axis. This configuration drastically increases the shot rate since there is no need for frequent foil changes and lengthy diode cavity pumpdowns. T h e performance of these diodes is currently being investigated with o u r low energy (1.5 MV) RLA injector and the 4-MV IBEX accelerator.A diode configuration with a large A-K gap (7 cm) and a very thin 6 mm in diameter cathode shank was investigated in detail. Particle and trajectory code simulations with only electrons are unable to reproduce the experimental results. It appears that the electron beam is focused by counterstreaming protons emitted from the anode aperture plate which intercepts the outer section of t h e e l e c t r o n beam. M A G I C simulations based on this assumption have reproduced quite well both the amplitude and the time evolution of the experimentally observed electron beams. A -600-A ion current can focus 15 k A of the electron heam throush the 3-cm anode aperture.presented and compared.A new high-gradient electron accelerator powered by modulated intense relativistic electron beams (MIREBs) has been developed at the Naval Research Laboratory. This accelerator is a combination of the two-beam and wake-field acceleration concepts. It relies on the interaction of two electron beams via a passive structure. The primary, or the driver beam is a large diameter MIREB, which transfers its RF power to a disk-loaded accelerating structure. The electromagnetic wave induced in this structure converges radially generating an average electric field of the order of 100 MV/m on the axis. A secondary electron beam is injected on the axis and accelerated by this hi h gradient field. electron beam emerged from a 1-m long accelerating structure, with a peak kinetic energy of 60 MeV and peak current of 200 Amperes. Simple scaling laws suggest that similar accelerators with much higher average electric fields can be built.In the experimentf,-a 0.2-cm-dia. secondary This work was supported by DOE, SDIO/HDL, and NRL. * TR ccllabcretic:: w i t ) . Y . Friezman, . I . P . 3 2 , 3 r d J. Krall. M . Friedman et al., Phys: Rev. Lett. a, 2468 (1989).A broadband (0.1-10 keV) conden...

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Low emittance foil diode studies for the recirculating linear accelerator (rla)

Cited by 2 publications

References 2 publications

Multi-pulse electron diode development for flash radiography

Multi-pulse electron diode development for flash radiography

Non-immersed apertured foilless diodes for the recirculating linear accelerator

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