Use of Activation Technique for the Measurement of Neutron Yields from Deuterium Plasmas at the Joint European Torus

Jarvis, O.N.; Clipsham, Edward W.; Hone, M.; Laundy, Brian J.; Pillon, M.; Rapisarda, M.; Sadler, G.; Belle, P. van; Verschuur, K.A.

doi:10.13182/fst91-a29668

Cited by 47 publications

(30 citation statements)

References 11 publications

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“…They were calibrated directly with respect to a standardised 252 Cf fission source inside the torus vessel in 1984/9 and that calibration has been maintained over the years by cross-calibration to the in-vessel Activation System. Accuracies of 8-10% have been achieved [1][2][3][4] The Activation System pneumatically delivers and retrieves capsules to/from locations inside the torus structure, e.g., to the edge of the vacuum vessel. There are 8 such 'Irradiation Ends' (IE), located in 5 octants.…”

Section: Introductionmentioning

confidence: 99%

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Fusion yield measurements on JET and their calibration

Syme

Popovichev

Conroy

et al. 2014

Fusion Engineering and Design

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Section: Introductionmentioning

confidence: 99%

“…Published by Elsevier B.V. All rights reserved. the pulse for counting of the induced gamma radioactivity or by delayed neutron counting, depending on the sample type placed within the capsule [4].…”

Section: Introductionmentioning

confidence: 99%

Fusion yield measurements on JET and their calibration

Syme

Popovichev

Conroy

et al. 2014

Fusion Engineering and Design

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“…The carousel design, which is being used at JET, 6 was introduced because of its high freedom to choose destinations where the capsules to be sent, with the low limitation in the number of the irradiation and counting stations. Inside the carousel, a rotating platter attached to the servo or stepping motor takes a role of moving the capsules to entry positions which are connected to the various irradiation and counting stations.…”

Section: B Carouselmentioning

confidence: 99%

Development of the prototype pneumatic transfer system for ITER neutron activation system

Cheon

Seon

Pak

et al. 2012

Review of Scientific Instruments

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The neutron activation system (NAS) measures neutron fluence at the first wall and the total neutron flux from the ITER plasma, providing evaluation of the fusion power for all operational phases. The pneumatic transfer system (PTS) is one of the key components of the NAS for the proper operation of the system, playing a role of transferring encapsulated samples between the capsule loading machine, irradiation stations, counting stations, and disposal bin. For the validation and the optimization of the design, a prototype of the PTS was developed and capsule transfer tests were performed with the developed system.

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“…A valuable supplement to the conventional neutron activation method is a delayed neutron activation method (e.g. at JET tokamak [1]) which uses fissionable isotopes as activated targets. Fissionable isotopes as 235 U, 238 U or 232 Th, irradiated with neutrons, emit prompt neutrons (* 99%) and later the so-called delayed neutrons (* 1%) from the fission products which decay with the betaemission.…”

Section: Introductionmentioning

confidence: 99%

Detection of Delayed Neutrons from Fissionable Samples: Monte Carlo Modelling and Physical Assumptions for a Design of the DET-12 Device

et al. 2018

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An activation of fissionable materials with neutrons has been considered as a possible neutron diagnostic of D-D and D-T fusion plasma. Fission reaction caused by fusion neutrons leads up to emission of secondary neutrons: prompt and delayed. Physical assumptions have been outlined to design a new device (DET-12) for measurements of delayed neutrons emitted from samples of fissionable materials activated with neutrons at big fusion-plasma devices. The aim is to support a classic neutron activation method used as one of plasma diagnostics at tokamaks or stellarators. An interpretation of the time decay of delayed neutrons enables an assessment of the primary neutron flux which induced fission reaction. Monte Carlo calculations have been carried out in order to elaborate the method considered. Nuclides like: pure 235 U, 238 U and 232 Th, have been selected as possible materials to be irradiated. Physical fundamentals of generation of the delayed neutrons are mentioned and a resulting concept of the DET-12 device, built in the Institute of Nuclear Physics, Poland, is presented. A general size and dimensions of particular constituent material layers, and a number and placement of neutron detectors are optimized by means of Monte Carlo modelling. Recommendations for a technical design of the measuring chamber were formulated. Detection efficiency of DET-12 has been also estimated.

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Use of Activation Technique for the Measurement of Neutron Yields from Deuterium Plasmas at the Joint European Torus

Cited by 47 publications

References 11 publications

Fusion yield measurements on JET and their calibration

Fusion yield measurements on JET and their calibration

Development of the prototype pneumatic transfer system for ITER neutron activation system

Detection of Delayed Neutrons from Fissionable Samples: Monte Carlo Modelling and Physical Assumptions for a Design of the DET-12 Device

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