No abstract available

No abstract available

[en] The discharge characteristics of a new combined low energy magnetron-ion-source sputtering system are presented. The ignition curves, current-voltage characteristics of the system in dependence on gas pressure, magnitude and topology of magnetic field have been researched both for autonomous operation of the planar magnetron discharge and Hall type ion source in plasma mode and for their combination. Spatial distributions of ion current are also presented. (author)

[en] The diffraction of electrons by a material grating has been observed by Davisson and Germer in 1927, which shows the wave-like behavior of electrons. Shortly afterward, Kapitza and Dirac predicted that electrons should also be diffracted by a standing wave of light which is analogous to the diffraction of light by a grating. In a similar way, atoms could be diffracted from an optical standing wave. The regions of maximum intensity of the standing wave acts like crystal planes having interplanar spacing half of the wavelength of the light. The incident atom interacts with the stationary electric field of optical standing wave via a periodic potential called 'ponderomotive potential'. During diffraction, the momentum of the standing wave photon is transferred to the incident particle along the standing wave by a two-photon process (absorption and stimulated emission), which is highly dependent on the atomic species, and its internal and external momentum states. Hence, the diffraction of atoms from a 1-D standing light crystal is a fundamental concept of atom optics and has become a standard tool in atom interferometry for the coherent mixing of momentum states. Employing a multi-element ion beam system available in our laboratory, where microwave plasma confined in a magnetic multicusp is used as an efficient ion source and ion beams are extracted and focused by an electrostatic lens system. The De Broglie wavelength (λdB) of the matter wave decreases with the increase in atomic mass of the incoming beam having the same energy and hence the fringe width (β) also decreases. The experimental set-up can detect the diffraction peaks for proton beams. Prior to carrying out the experiments, the diffraction pattern of extracted H⁺ beams from a standing wave formed by a pulsed laser (λ = 532 nm) will be observed after optimizing the laser parameters (e.g., intensity, pulse width, beam waist) and ion beam parameters (e.g., beam energy, beam size) using numerical simulation. The evolution of the eigenstate of incoming ions in the standing wave can be modeled by expanding the initial state in the basis of plane waves and solving the time-dependent Schrodinger's equation. The position and amplitude of the different order diffraction peaks will be calculated for different experimental parameters such as interaction time (τ) and laser intensity (I). The simulation results of eigen energy levels and eigen states for proton in the 'ponderomotive potential' will be presented. Additionally, the effect of the magnetostatic field on the diffraction pattern will be investigated theoretically as well as numerically. (author)

[en] Plasma column works like an RF antenna which uses plasma element instead of metal conductor. This plasma acts as a monopole transmission antenna, whose transmission wavelength corresponds to the size of plasma length by varying plasma column length and power. One can transmit/receive varied frequency signals using plasma column. Plasma column transmission/reception can be controlled and varied in real time to program the system for different frequency hopping. This paper presents automation system developed for transmission/reception of RF waves using plasma column. The power spectrum is plotted in order to check the received signal strength of the particular central frequency. It has the facility to feed the experimental data or any kind of data profiles of user choice. Labview based control system has been developed to control the plasma column length and power as per the transmitted frequency. USRP (Universal Software Radio Peripheral) is a device which receives / transmits radio frequency, in our system configuration. The USB based NI USRP has been used as a receiver as well as transmitter. The Receiver (Rx) application initially configures USRP with the known frequency to receive the new frequency, once the transmission (Tx) application sends the new frequency, the Rx application receives and tunes USRP with the new frequency to receive the data in that frequency. From the received frequency the length of the plasma column is calculated, then by using experimental data i.e. length vs plasma power data file, the power in dbm is extracted from the file according to the calculated length. The RF generator power automatically set by the control system with the extracted power information by length vs power data file. The RF generator have TCP/IP and USB interface to connect with computer. The received data is processed and the power spectrum is plotted, the peaks above the specified threshold are stored in to the file. The Tx application transmits sound files and the data files with multiple iterations. (author)

[en] A 50-kV indigenously designed tabletop accelerator (TTA) has recently been fabricated and installed at Manipal Centre for Natural Sciences (MCNS), Manipal Academy of Higher Education (MAHE) with the technical support of the design team from Inter-University Accelerator Centre, Delhi. The MCNS-TTA is equipped with a cold plasma-based Penning Ionization Gauge (PIG) ion source

[en] The structure design of RF ion source driving source and the heat flow and solid coupling analysis of RF coils were introduced. RF ion source is produced by the external antenna inductive coupling. Using design of dual RF driving source, each RF driving source power is about 60 kW, and the total RF ion source power is 120 kW, which can produce uniform high-density plasma to meet the stability requirements of long pulse operation. Upon completion of the above work, the RF ion source prototype assembly and preliminary test were completed. (authors)

[en] Ion current in a radio frequency (RF) ion source depends on parameters such as RF power, gas pressure, magnetic field, extraction voltage, etc. RF power and gas pressure determines the degree of ionization or plasma density inside a gas discharge tube. The magnetic field makes the electron path helical which increases the probability of collisions. The extraction potential exerts a Lorentz force to aid extraction of charged particles towards the extraction region. Ions are extracted along the axis of a discharge tube due to the potential difference created by the extraction or focusing electrode. Optimal conditions for formation of useful ion beam only exist for specific values of these parameters. The present study determines the operational characteristics of the newly developed RF ion source for extraction of high ion currents. Different components of the ion source are developed & studied to obtain their optimum values. The optimum operating parameters are: RF power = 220 Watts; Magnetic field = 500 Gauss; Extraction potential = 4 kV; Pressure = 1.7 x 10^-6 mbar; Focusing potential = 1 kV; Ion current = 1.479 mA

[en] The ion flux density from the anode cup of a duoplasmatron type ion source was measured under the same conditions as the source operation with a special double probe. The ion flux density of 2.64×10¹⁸n/cm² sec was obtained at the source pressure of 460μ. Torr., the arc current of 1.0 amp. and the magnetic field strength of 1100 gauss. The ion flux density is almost proportional to the arc current, the area of the anode aperture and the magnetic field strength in the region below 2000 gauss. Above this region of the magnetic field the saturation effect was observed. The ion flux density has a maximum value at the source pressure of about 200μ Torr. and decreases quickly at higher pressure side, but slightly at lower pressure side. (author)

[en] The cryogenic Penning Ion trap (PIT) facility at VECC has a specially designed cryostat where the trap along with its detection electronics will remain immersed in the liquid helium filled bore of a 5T superconducting cryomagnet dewar. Detailed descriptions of the magnet and mechanical assembly for immersing the trap assembly were described