A new method of reconstructing true spectra

Тихонов, А. Н.; Arsenin, V. Ya.; Dumova, A.N.; Mayorov, L. V.; Mostovoi, V. I.

doi:10.1007/bf01115326

Cited by 6 publications

(5 citation statements)

References 1 publication

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“…In [8], Bernhardi studied the unicity of the solution by analysing simulated emission data built from a three-Maxwellian distribution and to which statistical fluctuations have been added. These general inversions have been applied to ECR plasmas confined in magnetic mirrors [7,10,11]. An alternative method when dealing with thin-target BR is to use parametric expressions of the EDF with, for example, a few parameters for tokamak plasmas [12] or just two for the hot electron population of ECR plasmas [13].…”

Section: Implementation and Discussion Of The Deconvolution Methodsmentioning

confidence: 99%

Determination of electron distribution functions from thick-target Bremsstrahlung

Charles¹,

Lamoureux²

2001

Plasma Phys. Control. Fusion

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The energy distribution functions of electrons are obtained by analysing thicktarget Bremsstrahlung spectra. The method consists of expanding the unknown function on an appropriate functions basis and of solving the resulting system of linear equations. The various atomic processes involved can be treated with the desired accuracy. Applications are given for a variety of cases such as hollow cathode discharge plasmas, hot magnetized plasmas, and electron beams of travelling wave tubes. The analysis includes cases when the thick target is covered by an impurity coat.

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Section: Implementation and Discussion Of The Deconvolution Methodsmentioning

confidence: 99%

Determination of electron distribution functions from thick-target Bremsstrahlung

Charles¹,

Lamoureux²

2001

Plasma Phys. Control. Fusion

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“…However, also in this case the ill-posedness of the continuous version of this minimization problem can be proven [39]. In particular, the ill-posedness of this problem is the starting point of the Tikhonov regularization theory [40], which we will briefly discuss below.…”

Section: Iterative Image Reconstructionmentioning

confidence: 99%

Gamma Ray Emission Imaging in the Medical and Nuclear Safeguards Fields

Dendooven

Bubba

2022

The Euroschool on Exotic Beams, Vol. VI

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Gamma rays emitted from within an object can reveal information about that object in a non-destructive way, i.e. without physically opening the object and looking inside. This makes gamma ray emission imaging very useful in widely varying applications. In these notes, we highlight its application to the medical field, where we discuss molecular imaging in nuclear medicine and in vivo dose delivery verification in particle beam radiotherapy, and nuclear safeguards field, where imaging of spent nuclear fuel assemblies is part of monitoring the nonproliferation of nuclear weapons. The purpose and basic principles of gamma ray emission imaging are discussed as the foundation to look in more detail into the essential instrument design considerations and the iterative image reconstruction procedures. These notes are not intended to be a comprehensive review; their purpose is to introduce gamma ray emission imaging to those that are new to this technique. The examples of implementation that are presented were thus chosen in order to introduce the reader to a fairly wide range of applications and practical implementations.

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“…ФРЭЭ может быть определена по результатам спектрометрических измерений. Восстановление ФРЭЭ по измеренному спектру тормозного излучения требует решения интегрального уравнения [14,15] …”

Section: экспериментальные результаты и их обсуждениеunclassified

Investigation of the Initial Low Pressure Ecr-Plasma for Operation Mode of Gyromagnetic Autoresonance Plasma Accelerator

Андреев¹,

Korneeva²,

Laneev³

et al. 2013

PAST-TF

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Несмотря на длительную историю изучения циклотронно-резонансного взаимодействия частиц плазмы со сверхвысокочастотными полями в неоднородном магнитном поле, изучение плазмы ЭЦР-разряда низкого давления (1•10 -5 -1•10 -4 торр) продолжает представ-лять интерес как с фундаментальной, так и прикладной точек зрения. Целью проведённых исследований являлось изучение характери-стик исходной плазмы, создаваемой в магнитной ловушке пробочного типа в диапазоне рабочих параметров, обеспечивающих функ-ционирование экспериментального стенда для изучения механизма гиромагнитного авторезонанса. На основе спектрометрических методик (оптическая, рентгеновская и масс) определены компонентный состав плазмы разряда, её основные параметры и их изменение в зависимости от разрядных условий. Установлено, что в диапазоне рабочих параметров в плазме разряда присутствуют холодный (температура в диапазоне до 10 эВ, n ec = 7•10 10 cм -3 ) и горячий, функция распределения электронов по энергиям (ФРЭЭ) которого от-лична от максвелловской (средняя энергия масштаба десятка кэВ, n eh = 1•10 9 cм -3 ), электронные компоненты. Установлено, что средняя энергия горячего компонента зависит от расстройки магнитного поля относительно резонансного значения, давления плазмообразую-щего газа, его состава и мощности СВЧ, при этом концентрация более плотного холодного компонента практически постоянна.Ключевые слова: электронно-циклотронный резонанс, зеркальная магнитная ловушка, эмиссионная оптическая спектроскопия, масс-спектроскопия, рентгеновская спектроскопия, спектр тормозного излучения, восстановление функции распределения электронов по энергии. INVESTIGATION OF THE INITIAL LOW PRESSURE ECR-PLASMA FOR OPERATION MODE OF GYROMAGNETIC AUTORESONANCE PLASMA ACCELERATOR V.V. Andreev, M.A. Korneeva, E.B. Laneev, M.N. Mouratov, A.A. Novitsky, D.V. Chuprov Peoples Friendship University of Russia, Moscow, RussiaIn spite of its long history, investigation of cyclotron-resonant particles' interaction with electromagnetic wave in inhomogeneous magnetic field is of interest as before for fundamental and practical use. The main aim of presented study is to understand behavior of parameters of low pressure (1•10 -5 -1•10 -4 Torr) ECR-plasma confined in simple mirror trap at different discharge conditions and consequently to improve the performance of initial plasma source for gyromagnetic autoresonance (GA) plasma accelerator. Information about plasma component structure and their parameters as function of various discharge conditions (gas mixture, pressure, strength of magnetic field, HF-input power) has been obtained with aid of the EOS, XRS and mass-spectrometry instruments. The results showed that within working range plasma consists of two components i.e. bulk plasma with temperature up to 10 eV and density 7•10 10 cm -3 and hot one (average energy of about ten keV, density 1•10 9 cm -3 ) with nonmaxwellian EEDF. Average energy and density of hot component strongly depend on detuning the magnetic field strength with respect to the resonant value at minimum of tra...

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A new method of reconstructing true spectra

Cited by 6 publications

References 1 publication

Determination of electron distribution functions from thick-target Bremsstrahlung

Determination of electron distribution functions from thick-target Bremsstrahlung

Gamma Ray Emission Imaging in the Medical and Nuclear Safeguards Fields

Investigation of the Initial Low Pressure Ecr-Plasma for Operation Mode of Gyromagnetic Autoresonance Plasma Accelerator

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