Status of the SPI for the JINR Accelerator Complex

2016 ◽  
Vol 40 ◽  
pp. 1660103
Author(s):  
V. V. Fimushkin ◽  
A. D. Kovalenko ◽  
L. V. Kutuzova ◽  
Yu. V. Prokofichev ◽  
A. S. Belov ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Deuteron Beam ◽  
Ion Source ◽  
Accelerator Complex ◽  
Accelerator Facility ◽  
Current Output ◽  
Close Cooperation ◽  
Under Construction ◽  
Nuclotron Accelerator ◽  
Tensor Formula

The Source of Polarized Ions (SPI) of deuterons and protons with nearly resonant charge-exchange plasma ionizer is under construction at the LHEP, JINR. The [Formula: see text]D[Formula: see text] ([Formula: see text]H[Formula: see text]) current output of the source is expected to be at a level of 10[Formula: see text]mA. The polarization will be up to 90% of the maximal vector (±1) for [Formula: see text]D[Formula: see text] ([Formula: see text]H[Formula: see text]) and tensor ([Formula: see text]1, [Formula: see text]) polarization for [Formula: see text]D[Formula: see text]. Realization of the project is carried out in close cooperation with INR of the RAS (Moscow). The equipment available from the CIPIOS ion source (IUCF, Bloomington, USA) is partially used for the Dubna setup. The new source at the JINR NUCLOTRON accelerator facility will make it possible to increase the polarized deuteron beam intensity up to the level of 10[Formula: see text] [Formula: see text]/pulse.

scholarly journals Status of NICA

2018 ◽  
Vol 182 ◽  
pp. 02063 ◽  
Author(s):  
Vladimir Kekelidze ◽  
Alexander Kovalenko ◽  
Richard Lednicky ◽  
Victor Matveev ◽  
Igor Meshkov ◽  
...  
Keyword(s):  
High Energy Physics ◽  
Nuclear Research ◽  
High Energy ◽  
Design Stage ◽  
Target Area ◽  
Baryonic Matter ◽  
Accelerator Facility ◽  
Polarized Protons ◽  
The Status ◽  
Under Construction

The NICA (Nuclotron-based Ion Collider fAcility) is the new international research facility under construction at the Joint Institute for Nuclear Research (JINR) in Dubna. The main targets of the facility are the following: 1) study of hot and dense baryonic matter at the energy range of the maximum baryonic density; 2) investigation of nucleon spin structure and polarization phenomena; 3) development of JINR accelerator facility for high energy physics research based on the new collider of relativistic ions from protons to gold and polarized protons and deuterons as well with the maximum collision energy of sqrt(sNN) ~11GeV (Au79+ +Au79+) and ~ 27 GeV (p+p). Two collider detector setups MPD and SPD are foreseen. The setup BM@N (Baryonic Matter at Nuclotron) is commissioned for data taken at the existing Nuclotron beam fixed target area. The MPD construction is in progress whereas the SPD is still at the beginning design stage. An average luminosity of the collider is expected at the level of 1027 cm-2 s-1 for Au (79+) and 1032 cm-2 s-1 for polarized protons at 27 GeV. The status of NICA design and construction work is briefly described below.

scholarly journals The emission properties, structure and stability of ionic liquid menisci undergoing electrically assisted ion evaporation

2022 ◽  
Vol 933 ◽  
Author(s):  
Ximo Gallud ◽  
Paulo C. Lozano
Keyword(s):  
Ionic Liquid ◽  
Steady State ◽  
Ion Source ◽  
Emission Region ◽  
Tension Stress ◽  
Liquid Temperature ◽  
Axially Symmetric ◽  
Current Output ◽  
Hydraulic Impedance ◽  
Ion Evaporation

The properties and structure of electrically stressed ionic liquid menisci experiencing ion evaporation are simulated using an electrohydrodynamic model with field-enhanced thermionic emission in steady state for an axially symmetric geometry. Solutions are explored as a function of the external background field, meniscus dimension, hydraulic impedance and liquid temperature. Statically stable solutions for emitting menisci are found to be constrained to a set of conditions: a minimum hydraulic impedance, a maximum current output and a narrow range of background fields that maximizes at menisci sizes of 0.5–3 ${\rm \mu}{\rm m}$ in radius. Static stability is lost when the electric field adjacent to the electrode that holds the meniscus corresponds to an electric pressure that exceeds twice the surface tension stress of a sphere of the same size as the meniscus. Preliminary investigations suggest this limit to be universal, therefore, independent of most ionic liquid properties, reservoir pressure, hydraulic impedance or temperature and could explain the experimentally observed bifurcation of a steady ion source into two or more emission sites. Ohmic heating near the emission region increases the liquid temperature, which is found to be important to accurately describe stability boundaries. Temperature increase does not affect the current output when the hydraulic impedance is constant. This phenomenon is thought to be due to an improved interface charge relaxation enhanced by the higher electrical conductivity. Dissipated ohmic energy is mostly conducted to the electrode wall. The higher thermal diffusivity of the wall versus the liquid, allows the ion source to run in steady state without heating.

scholarly journals Status of the NICA project at JINR

2018 ◽  
Vol 191 ◽  
pp. 01003 ◽  
Author(s):  
Alexander Kovalenko ◽  
Vladimir Kekelidze ◽  
Richard Lednicky ◽  
Viktor Matveev ◽  
Igor Meshkov ◽  
...  
Keyword(s):  
High Energy Physics ◽  
Nuclear Research ◽  
High Energy ◽  
Design Stage ◽  
Target Area ◽  
Baryonic Matter ◽  
Accelerator Facility ◽  
Polarized Protons ◽  
The Status ◽  
Under Construction

The NICA (Nuclotron-based Ion Collider fAcility) is the new international research facility under construction at the Joint Institute for Nuclear Research (JINR) in Dubna. The main targets of the facility are the following: 1) study of hot and dense baryonic matter at the energy range of the maximum baryonic density; 2) investigation of nucleon spin structure and polarization phenomena; 3) development of JINR accelerator facility for high energy physics research based on the new collider of relativistic ions from protons to gold and polarized protons and deuterons as well with the maximum collision energy of √SNN ~11GeV (Au79+ +Au79+) and ~ 27 GeV (p+p). Two collider detector setups MPD and SPD are foreseen. The setup BM@N (Baryonic Matter at Nuclotron) is commissioned for data taken at the existing Nuclotron beam fixed target area. The MPD construction is in progress whereas the SPD is still at the beginning design stage. An average luminosity of the collider is expected at the level of 1027 cm-2 s-1 for Au79+ and 1032 cm-2 s-1 for polarized protons at 27 GeV. The status of NICA design and construction work is briefly described below.

scholarly journals Experimental study of materials radiation resistance in reactor mixed fields for the construction of the SPES facility at LNL

2018 ◽  
Vol 48 ◽  
pp. 1860104
Author(s):  
A. Zenoni ◽  
F. Bignotti ◽  
A. Donzella ◽  
G. Donzella ◽  
M. Ferrari ◽  
...  
Keyword(s):  
Ion Source ◽  
Operating Conditions ◽  
Primary Proton ◽  
Radiation Fields ◽  
Nuclear Species ◽  
Elastomeric Materials ◽  
Mixed Field ◽  
Materials Used ◽  
Under Construction ◽  
Mixed Fields

The Selective Production of Exotic Species (SPES) facility, now under construction at Legnaro National Laboratories of INFN, is a second-generation accelerator for the production of neutron-rich ion beams. The radioactive nuclear species are produced by fission of a [Formula: see text]U target, on which a 200[Formula: see text][Formula: see text]A primary proton beam of 40[Formula: see text]MeV energy impinges. Materials and components constituting the Target and Ion Source assembly and the Front-End supporting structure are subjected to serious radioactive damage due to intense neutron and photon fields present under operating conditions. In the framework of the SPES project, experimental campaigns aimed at testing the radiation hardness of critical materials and components of potential use in the construction were started. Irradiations were conducted in a reactor mixed field of neutrons and photons in order to reproduce, as close as possible, the actual environmental service conditions. Results obtained for different types of elastomeric materials used for construction of vacuum O-rings, as well as preliminary results obtained for lubricating oils and greases, are presented. Materials under consideration are both conventional ones as well as materials specifically developed for applications in the presence of ionizing radiation. The latter materials were previously tested mainly in gamma radiation fields.

Progress in development of Nuclotron accelerator complex

2010 ◽  
Vol 7 (7) ◽  
pp. 442-445 ◽  
Author(s):  
N. N. Agapov ◽  
A. V. Alfeev ◽  
V. A. Andreev ◽  
V. I. Batin ◽  
O. I. Brovko ◽  
...  
Keyword(s):  
Accelerator Complex ◽  
Nuclotron Accelerator

scholarly journals THE DESIGN OF A COMPACT RFQ NEUTRON GENERATOR

2014 ◽  
Vol 27 ◽  
pp. 1460126
Author(s):  
R. W. HAMM ◽  
R. BECKER
Keyword(s):  
Neutron Generator ◽  
Direct Injection ◽  
Deuteron Beam ◽  
Ion Source ◽  
Fringe Field ◽  
Neutron Output ◽  
Plasma Injection ◽  
Source Voltage ◽  
End Wall ◽  
Ecr Source

The output and target lifetime of a conventional electrostatic neutron generator are limited by the voltage stand-off capability and the acceleration of molecular species from the ion source. As an alternative, we suggest that the deuterium beam achievable from a compact high intensity ECR source can be injected directly into a compact RFQ to produce a more efficient compact neutron production system. Only the d+ ions are accelerated by the RFQ, which can also produce much higher output energies than electrostatic systems, resulting in a higher neutron output with a longer target lifetime. The direct injection of the beam makes the system more compact than the multielement, electrostatic systems typically used for extraction of the beam and subsequent transport and matching into the RFQ. We have designed and optimized a combined extraction/matching system for a compact high current deuterium ECR ion source injected into a high frequency RFQ structure, allowing a beam of about 12 mA of d+ ions to be injected at a modest ion source voltage of 25 kV. The end wall of the RFQ resonator serves as the ground electrode for the ion source, resembling DPI (direct plasma injection). For this design, we used the features of the code IGUN to take into account the electrostatic field between the ion source and the RFQ end wall, the stray magnetic field of the ECR source, the defocusing space charge of the low energy deuteron beam, and the rf focusing in the fringe field between the RFQ vanes and the RFQ flange.

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