CPP-IPR Inter-Laboratory Seminars 15:

Title: A presentation on the research program proposed by CIMPLE-PSI laboratory for the next three years, which constitutes a part of the CPP-IPR sub-project submitted to DAE for funding

Speaker: Dr. Mayur Kakati

Date, time and venue: 04/02/2020, Time: 3.00 pm, CPPIPR Conference Hall

ABSTRACT:

Under the CPP-IPR subproject, submitted to DAE for funding for the next three years, the proposal from CIMPLE-PSI laboratory is included with the following title head: “Studies on controlled plasma fusion relevant plasma surface interaction in CIMPLE-PSI and bulk synthesis of nanomaterials for water treatment”. I will start this talk, with an introduction to the field of plasma surface/material interaction (PSI) relevant for controlled plasma fusion research, present a brief review on the work done in this direction by this laboratory , including establishment of the CIMPLE-PSI facility and its outstanding capability in reproducing ITER divertor like extreme plasma conditions. Proposed plasma exposure experiments will be described in terms of some possible plasma facing materials, including tungsten, reduced activation ferritic martensitic steel, and some special alloys. We will also discuss studies on plasma-assisted synthesis of nanomaterials in the CIMPLE-PSI laboratory and highlight some important results from previous experiments. The proposed experiments in this direction for the next three years include bulk synthesis of zero and one dimensional, highly porous, tungsten oxide and some exotic nanocomposites, for water treatment. I will also present a glimpse of the total budget and list of the major instruments requested under the proposal.

CPP-IPR Inter-Laboratory Seminars 14:

Title: Mechanical Design and Application of CATIA in CPP-IPR perspective

Speaker: Amarendra Baishya

Date, time and venue: 24/11/2017, Time: 3.00 pm, CPPIPR Conference Hall

ABSTRACT:

The term Design is very common in our day to day life. Everyone of us understands it in various ways. Mechanical Design is the process of devising a system, component, or process to meet desired needs. It is a decision-making process (often iterative), in which the basic science and mathematics and engineering sciences are applied to convert resources optimally to meet a stated objective. CATIA is a tool to model the design concept so as to visualise the proposed system, component in its actual way. Once the Design is final, the parts of the system can be represented as drawings for fabrication, manufacturing. The same has been applied in designing various Plasma Experimental system in CPP-IPR.

CPP-IPR Inter-Laboratory Seminars 13:

Title: DATA ACQUISITION AND CONTROL SYSTEM in Negative Hydrogen Ion Extraction Lab

Speaker: Nandan Bikash Sarma

Date, time and venue: 3 PM, Date: 27/10/2017 at CPPIPR Conference Hall

ABSTRACT:

During the extraction phase of Negative Hydrogen Ion, the source or plasma chamber will be floated with a potential difference of 30 Kilo-Volt with respect to the extraction chamber which is grounded. To control the operation from a finite distance and to monitor and acquire the data we took the help of some cutting edge technologies. It is a big challenge for us, since the signals which will be floated at a 30KV, has to be coupled with the electronics for automation that works in a comparatively low DC input. We had to work on for an Optical Isolation or Fiber Optics Transmission to overcome the issue. The proposed talk will give a glimpse of the principle and the pathway to control, monitor and acquire the data.

CPP-IPR Inter-Laboratory Seminars 12:

Title: Study on Neutron Emission from an Inertial Electrostatic Confinement Device

Speaker: Mr. N. Buzarbaruah, SRF

Date, time and venue: 25th Sept.2017 (Monday), 03.00 PM, at CPP-IPR Seminar Hall

ABSTRACT:

The concept of inertial electrostatic confinement (IEC) fusion is of a particular interest for the research community due to its various near term non-electric applications as portable neutron/proton sources. The most promising applications include neutron activation analyses (NAA), neutron radiography, medical isotope production, low power ion thrusters etc. IEC is mainly a fusion concept where the lighter fuel ions (D, T) are trapped in a converging electrostatic field inside a cylindrical or spherical geometry. CPP-IPR is the first institute in India to develop a cylindrical IECF device and aims to demonstrate the 2.45MeV neutrons by fusing deuterons (DD). The functional parameters of the device such as design and dimension of gridded electrodes, rating of electrical feedthrus, dimension of cylindrical chamber etc. were determined after detailed theoretical and computational analysis. Deuterium plasma was produced in the device by employing two alternate discharge techniques i.e. hot and cold cathode discharges. The basic plasma parameters were measured using the Langmuir probe, Mach probe and the Optical emission spectroscope (OES) . The device was coupled to the high voltage power supply (-200kV, 80mA) and was operated in the voltage range from -20kV to -80kV. On application of high voltage to the cathode grid the deuterons produced in the plasma discharge are accelerated inside the cathode region and oscillates in the negative potential well formed in between the cathode grid and chamber (anode). Thus fusion reactions occur between the counterflowing ions or between the ions and the background neutral particles. The emission of DD fusion neutrons from our cylindrical IECF device has been confirmed by employing different neutron diagnostics such as handheld neutron monitor, bubble detector, He-3 proportional counter and nuclear track detectors (CR 39). The details regarding the dependency of neutron production rate (NPR) on the neutral gas density and applied power will be discussed.

CPP-IPR Inter-Laboratory Seminars 11:

Title: Measurement of Plasma Parameters in Pulsed Plasma Accelerator

Speaker: Dr. Nayan Talukdar, CPP-IPR

Date, time and venue: April 12, Wednesday, 2017, 02.30 PM, at CPP-IPR Seminar Hall

ABSTRACT:

A systematic study on wall conditioning is carried out in an ultrahigh vacuum device with an objective to evaluate the optimum wall conditioning parameters for graphite and SS 304L wall materials. Higher gas loads of different impurities are observed with graphite than SS 304L wall. Recent experimental results show that for the removal of water impurity from SS 304L and graphite walls, the chamber walls should be baked at ? 2500C. Helium glow discharge cleaning (He-GDC) is found to be very effective for desorption of hydrogen impurities whereas Hydrogen (H) GDC is very effective for the desorption of carbon and oxygen impurities. The desorption of water impurities show almost similar behaviour in both H- and He-GDC. It is observed that the H- and He-GDC at elevated wall temperature is very effective for the desorption of wall impurities. The fuel retention on graphite wall during H-GDC is much higher as compared to He-GDC. Recent experimental results show that the fuel retention on walls can be reduced by performing the GDC at elevated wall temperature.

CPP-IPR Inter-Laboratory Seminars 10:

Title: Theory of the Magnetized Sheath Formation

Speaker: Rakesh Moulick

Date, time and venue: March 17, 03.00 PM, CPP-IPR Seminar hall

ABSTRACT:

It has attracted a considerable amount of research to investigate the effect of the presence of magnetic field while forming the sheath. In the scenario where the ions are not strongly magnetized as compared to the electrons, the sheath is split into three distinct regions: the presheath (PS), Chodura sheath (CS) and the Debye sheath (DS). The process is such that the Chodura sheath is quasineutral and allows the ions to have a unit Mach number at the exit of CS. Often researchers limit themselves to investigate the whole scenario only in the DS scale. In the present work, it is shown that there is a serious risk involved in such practice and the CS exit is not well determined. Rather, the practice of providing the ion Mach number only in one direction at the CS exit is also negated in the present investigation. It is shown that the net velocity magnitude of the ion may have the ion sound speed, but due to the velocity sharing, it is hard to predict what should be the exact value for each component of the velocity at the CS exit. The magnetic field geometry considered is tilted with respect to the wall. The tilting angle can be used as switching parameter to the electrostatic situation and magnetic one. A condition of sheath formation is also found under collisional condition.

CPP-IPR Inter-Laboratory Seminars 09:

Seminar Title: Ion dynamics in magnetized plasma sheath

Speaker: Dr. R. Moulick

Date, time and venue: October 04, 2016, 03.00 PM at CPP-IPR Seminar Hall

Abstract:

The central concern of the work is the study of the ion dynamics inside a magnetized plasma sheath under collisionless environment. The ionization effects are considered within the sheath. The magnetic field is tilted in x-z plane and makes an inclination angle with the x-axis. The motivation of the paper is to see the effect of both field strength variation and the variation of the inclination angle on the dynamics of the ions inside the sheath. The pitch length and pitch angle for the particle velocity field is also calculated and has been found to vary widely with the inclination angle and the strength of the magnetic field. The role of the Lorentz force and energy acquired by the ions while moving towards the wall is also highlighted."

CPP-IPR Inter-Laboratory Seminars 08:

Seminar Title: Installation of 200 kJ pulsed power system to drive a plasma accelerator

Speaker: Dr. N.K. Neog

Date, time and venue: August 19, 03.00 PM

Abstract:

A pulsed-plasma accelerator is being developed at CPP-IPR. The accelerator consists of a co-axial electrode assembly housed inside an evacuated chamber that can produce high speed plasma stream. For driving this plasma accelerator, a Pulsed Power System (PPS) of energy nearly 200kJ is being coupled to the electrode assembly. In this presentation, the installation of a 200kJ PPS will be discussed. This PPS consists of two units of capacitor-banks of 100kJ each at 15kV. Each 100kJ capacitor bank consist of five numbers of energy storage capacitor of rating 178?F, 15kV each, connected in parallel by using two parallel plates of SS. The newly installed 200kJ bank has been tested and the detailed report of installation and testing will be presented. Recently, One of the banks have been connected to the plasma accelerator chamber and successfully test fired to produce plasma

CPP-IPR Inter-Laboratory Seminars 07:

Seminar Title: Initial steps towards RCDOS

Speaker: Dr. P.J. Bhuyan

Date, time and venue: July 22, Friday, 03.00 PM, CPP-IPR Seminar Hall

Abstract:

The design of any new fusion reactor involves the appropriate choice of dimension and material composition of its various sub-systems (Blanket, First wall, Vacuum vessel, TF coil etc). Neutronics represent one of the important constraints required to be satisfied by the design. At present, the neutronics analysis of these components is done with the MCNP code, which also happens to be the code chosen by the ITER project for such calculations. The main steps in MCNP analysis involves preparation of a MCNP input file, processing the file with MCNP, and then analysis of the output (results) obtained from the code. The MCNP input file contains the geometry and material composition of the region under study. It also includes information about the kind of sources present, and also the type of result we want from the calculation. Reactor component Design and Optimization System (RCDOS) is a proposed system of codes that we intend to develop, that will be used to Design and optimize the future fusion reactors (from neutronics point of view) under some design constrains, using MCNP as the core (backend) code. With this being our long-term objective, our immediate objective is to device a mechanism for parametric study of reactor designs, where one or more parameters of the design are altered to see their effect on the reactor performance, and thereby "manually" optimizing the reactor design. Any such parametric study will involve the preparation of multiple numbers of MCNP input files, which turns out to be a tedious task, when done manually. Therefore, this step needs to be automated to the extent possible. In this talk we will briefly describe the general format of MCNP input files, and our recent efforts towards (semi) automating the MCNP input file preparation process for certain (Concentric cylindrical) geometries. Finally, future tasks planned in this direction will be elaborated.

CPP-IPR Inter-Laboratory Seminars 06:

Seminar Title: Tungsten microparticles with highly non-equilibrium morphologies for studies on hydrogen absorption in a fusion environment

Speaker: Dr. M. Kakati

Date, time and venue: May 27, Friday, 03.00 PM, CPP-IPR Seminar Hall

Abstract:

A segmented plasma torch based experimental system was used to produce tungsten micron sized dust particles of relevance to plasma fusion environments. An argon/hydrogen collimated plasma beam with ITER Divertor like parameters (10 MW/m2 heat and 1024 m-2s-1 ion flux) interacted with a Plansee tungsten target, and highly non-equilibrium skeletal tungsten crystals were seen resolidified in the central exposed region, whereas equilibrium structures with polyhedral morphologies were observed in the peripheral areas. Evaporated tungsten on the other hand had condensed on water-cooled components inside the chamber, in single-crystal nanostructures and rod/tree like morphologies. Skeletal particles were rubbed-off from the target, and annealed at vacuum for two hours, at 475 C and under 0.5 lpm flowing hydrogen. Hydrogen absorption of this alpha-tungsten sample was measured to be 2.6 at% by Nuclear Reaction Analysis (NRA), which will be compared in this presentation with bulk and nanomaterials. Skeletal structures had been observed before in plasma fusion device, graphitic particles in Tokamak T-10. High driving forces in the form of under-cooling/super-saturation are understood to have lead to those non-equilibrium morphologies, having typically high specific surface areas. Non-equilibrium situations will be more intense with all future tokamaks with typically ever increasing energy density, and skeletal/dendritic morphologies are likely to dominate

CPP-IPR Inter-Laboratory Seminars 05:

Seminar Title: Overview of Inertial Electrostatic Confinement Fusion Research at CPPIPR

Speaker: Dr. S.R. Mohanty

Date, time and venue: May 20, Friday, 2016, 03.00 PM, at CPP-IPR seminar room

Abstract:

Inertial Electrostatic Confinement (IEC) is a unique approach for confining the deuterium ions in converging electrostatic fields for fusion purposes. The devices based on this concept offer many potential advantages, including simplified support structures and the ability to create non-Maxwellian plasmas that can be used with a variety of fusion fuels. Further, it's simple construction and ability to provide a relatively high fusion rate in a small volume prompt researchers to use such devices for a number of near-term applications in the area of land mine detection, neutron radiography, clandestine material detection at air- and sea- ports, medical isotope production, plasma space propulsion and tunable x-ray sources. The IEC device mainly comprises of a concentric coaxial cylindrical/spherical grid assembly housed inside a cylindrical/spherical vacuum chamber, a gas injection system, a high voltage feedthru and a high voltage negative polarity power supply. On application of the high negative potential of few tens of kV to the inner grid of the device, the ions oscillate around the central grid and would overcome the coulomb barrier. Thus they fuse together to produce neutrons of the order 108 n/s. Realizing the importance of the IEC device in diversified fields, CPPIPR started a program to build IEC fusion devices in XII plan. This talk will provide the glimpse of IEC research activities at aboard and our initiative. This talk will provide the glimpse of IEC research activities at aboard and our initiative.

CPP-IPR Inter-Laboratory Seminars 04:

Seminar Title: Investigation of surface wave dispersion pattern along plasma dielectric gradient

Speaker: Dr. M. Dey, CPP-IPR

Date, time and venue: February 26, 2016, 3.00 PM, Seminar Hall, CPP-IPR, Sonapur 782 402

Abstract:

Propagation of surface waves has been noticed in many natural phenomena as well as under laboratory conditions. Surface waves evolve under such situations where discontinuity in media in terms of material density, refractive index, dielectric gradient etc. is noticed. The presentation will deal with propagation of plasma surface waves along a surface which has a distinct dielectric gradient. Two separate situations will be discussed viz. a case where two different types of plasmas will be considered to reside on two sides of a sharp boundary and in the other case propagation of surface waves along a dust void boundary will be considered. Analytical formulation in either case will be presented and the nature of variation in surface wave dispersion pattern with plasma parameters will be discussed.

CPP-IPR Inter-Laboratory Seminars 03:

Seminar Title: The present status of experimental system for extraction of negative hydrogen ions

Speaker: Dr. S.S. Kausik, Dusty Plasma Laboratory, CPP-IPR

Date, Time and Venue: December 28, 2015 (Monday), 3.00 PM, CPP-IPR Seminar Room

Abstract:

The production of negative hydrogen ions using cesium (Cs) coated tungsten dust is a novel idea, where the Cs monolayer formation on tungsten particles greatly increases negative ion yield as it decreases surface material work function. Cs coated tungsten dust grains suspended in the plasma volume act like a volume source of negative ions by the surface interaction process. Recent experimental results on production of negative hydrogen ions using Cs coated tungsten dust motivate us to investigate the possibility of extraction of these ions, which have an important role in the particle accelerator system and even for fusion research. A negative ion extraction experimental facility is being setup at CPP-IPR for this purpose. The experimental system will be described for the conceptual design and implementation strategy. The preliminary experimental results will be discussed. In addition, the proposed research works in this system will be talked about.

CPP-IPR Inter-Laboratory Seminars 02:

Seminar Title: Pulsed Plasma Accelerator Laboratory and Its Steps towards the commissioning of the 200 kJ Pulse Power System (PPS)

Speaker: Dr. T. K. Borthakur, Pulsed Plasma Accelerator Laboratory, Applied Plasma Research Section, CPP-IPR

Date, time and venue: November 18, Wednesday, 2015, 3.00 PM, CPP-IPR Seminar Room.

Abstract

The Pulsed Plasma Accelerator Laboratory (PPAL) has been built to facilitate a high energy plasma beam that may be used to simulate the plasma matter interaction. The proposed work is based on to build a coaxial plasma accelerator which will be powered by a pulsed power system (PPS). While going for this work, there were many issues from the initial idea generation, concept building, estimation and designing, space management, safety that has been tackled and trying to be tackled until today. The modification work is going on in this newly built laboratory building (temporary). We are carrying out testing, installing each component of laboratory items. Here we are presenting initial steps taken for the project work based on which we are going to commission a 200 kJ pulsed power system in near future.

CPP-IPR Inter-Laboratory Seminars 01:

Seminar Title: Present status on the development of CIMPLE-PSI and planning for future experiments in plasma material interactions

Speaker: Dr. M. Kakati, Applied Plasma Research Section, CPP-IPR

Date, time and venue: October 14th (Wednesday), 2015, 3.00 PM, CPP-IPR Seminar Hall

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