Production and use of low-energy, monoenergetic positron beams from electron LINACS

Howell, R.H.; Rosenberg, I. J.; Fluss, M. J.

doi:10.1007/bf00635179

Cited by 41 publications

(18 citation statements)

References 16 publications

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“…This normalized result, γ N , is plotted in figure 12 along with several previously reported measurements 3,5,8 .…”

Section: Comparison To Measured Slow Positron Yieldsmentioning

confidence: 67%

“…T b is the maximum temperature of the material inside the electron beam (on axis), while T w is the temperature of the copper block in contact with the water coolant. For tantalum ρ = 16.7 g/cm 3 and λ = 57.6 W/(m K) at 300 K. The thermal conductivity of tantalum has been measured to increase with increasing temperature, up to a value of 61.4 W/(m K) at 1800 K 38 but this small temperature dependence was ignored in the subsequent analysis and the room temperature value used. The converter material will also radiate heat, with the power dissipation, P r , given by,…”

Section: Beam Heating Of the Convertermentioning

confidence: 99%

“…The use of electron accelerators is a well established technique for the production of slow positrons, with numerous facilities based on linear accelerators (LINAC) [1][2][3][4][5][6][7][8][9] or microtrons 10,11 . Positrons are generated via pair creation when energetic electrons are stopped in a high-Z target, the electron-positron converter.…”

Section: Introductionmentioning

confidence: 99%

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Simulations of slow positron production using a low-energy electron accelerator

O’Rourke

Hayashizaki

Kinomura

et al. 2011

Review of Scientific Instruments

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Monte Carlo simulations of slow positron production via energetic electron interaction with a solid target have been performed. The aim of the simulations was to determine the expected slow positron beam intensity from a low energy, high current electron accelerator. By simulating (a) the fast positron production from a tantalum electron-positron converter and (b) the positron depth deposition profile in a tungsten moderator, the slow positron production probability per incident electron was estimated. Normalizing the calculated result to the measured slow positron yield at the present AIST LINAC the expected slow positron yield as a function of energy was determined. For an electron beam energy of 5 MeV (10 MeV) and current 240 µA (30 µA) production of a slow positron beam of intensity 5 × 10 6 s −1 is predicted. The simulation also calculates the average energy deposited in the converter per electron, allowing an estimate of the beam heating at a given electron energy and current. For low energy, high-current operation the maximum obtainable positron beam intensity will be limited by this beam heating.

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“…This normalized result, γ N , is plotted in figure 12 along with several previously reported measurements 3,5,8 .…”

Section: Comparison To Measured Slow Positron Yieldsmentioning

confidence: 67%

Section: Beam Heating Of the Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulations of slow positron production using a low-energy electron accelerator

O’Rourke

Hayashizaki

Kinomura

et al. 2011

Review of Scientific Instruments

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“…Low energy positrons are obtained from either radioisotope sources [51 or from LINAC sources [6]. Radioisotope sources are currently limited to positron fluxes of < 108 slow positrons per second, while LINAC sources have the potential for positron fluxes greater than 109 s-i.…”

Section: Positron Trappingmentioning

confidence: 99%

Practical limits on positron accumulation and the creation of electron-positron plasmas

Greaves¹,

Surko²

2002

AIP Conference Proceedings

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Abstract. The tasks of accumulating large numbers of positrons, creating high-density positron plastnas, and confining electron-positron plasmas present a number of technical challenges. Some practical considerations and limitations of common confinement schemes are discussed. A novel design for a multi-ccll Penning-Malmberg trap is proposed for the accumulation of large numbers of positrons (e.g., > 1012 and T -05 cV). A method is dcscribed to create a Ilow-density, electronpositron plasma (e.g., it "-107 cmt 3) for basic plasma physics studies that uses a cotnhinatiom of radio-frequency and magnetic confincment. The possibilities for confinement of a hot (cc.. T > 10 keV) electron-positron plasma in a magnetic mirror arc also discussed.

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“…Source [27]. The system is capable of producing over 106 moderated positrons in 20 ns pulses at a repetition rate of up to 1440 Hz.…”

Section: Positron Sourcementioning

confidence: 99%

High-field penning-malmberg trap: confinement properties and use in positron accumulation

Hartley¹

1997

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Production and use of low-energy, monoenergetic positron beams from electron LINACS

Cited by 41 publications

References 16 publications

Simulations of slow positron production using a low-energy electron accelerator

Simulations of slow positron production using a low-energy electron accelerator

Practical limits on positron accumulation and the creation of electron-positron plasmas

High-field penning-malmberg trap: confinement properties and use in positron accumulation

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