Arup Bandyopadhyay

Bio: Arup Bandyopadhyay is an academic researcher from Variable Energy Cyclotron Centre. The author has contributed to research in topics: Cyclotron & Beam (structure). The author has an hindex of 9, co-authored 35 publications receiving 173 citations. Previous affiliations of Arup Bandyopadhyay include Homi Bhabha National Institute.

The ANURIB project at VECC – Plans and preparations

Abstract: VECC is planning to develop a rare ion beam facility called ANURIB 1 (Advanced National facility for Unstable and Rare Isotope Beams) at the upcoming new campus at New Town in Kolkata. ANURIB aims to attract a wide user community in nuclear physics, nuclear-astrophysics, material science and biology and will provide India with world class accelerator facilities. ANURIB will be built around a 50 MeV 100 kW superconducting electron linac (e-Linac) photo-fission driver and is planned to be a combined ISOL and PFS type facility. Construction of the facility will also enable next generation research into production of medical isotopes. In preparation for ANURIB, a low energy ISOL type facility has been built around the existing K130 cyclotron at VECC. Developed for the past decade, this facility was aimed at completing major R&D steps involved in the construction of ANURIB. Presently this facility accelerates beams up to energy of 415 keV/u and recently first radioactive beams have been produced. Development of a 10 MeV Injector Cryo Module for the e-Linac has been started in collaboration with TRIUMF. In this paper the plans for ANURIB project and present status of the R&D activities will be presented.

β-delayed proton decay of 24 Si

Abstract: A novel experimental approach has been employed for the measurement of $\ensuremath{\beta}$-delayed protons from ${}^{24}\mathrm{Si}$ produced via the fragmentation of a ${}^{28}\mathrm{Si}$ beam with an energy of 100 MeV/nucleon. The secondary beam of ${}^{24}\mathrm{Si}$ was separated by the projectile fragment separator RIPS at RIKEN and was implanted in a 2.6 $\ensuremath{\mu}\mathrm{m}$ aluminum foil placed parallel to a gas-$\ensuremath{\Delta}E$ and silicon-$E$ detector telescope for the measurement of delayed protons. The above arrangement has led to a very clean, $\ensuremath{\beta}$-ray background free delayed proton energy spectra and a few new proton peaks could be identified from the decay of ${}^{24}\mathrm{Si}.$

The design of a four-rod RFQ LINAC for VEC-RIB facility

Abstract: A Radio Frequency Quadrupole (RFQ) linac has been designed for the Radioactive Ion Beam (RIB) facility being built at the Variable Energy Cyclotron Centre (VECC), Kolkata, India. Low-energy RIBs of 1.0 keV/ u and q/A ⩾1/16 will be accelerated to about 86 keV/ u in a 35 MHz, 3.2 m long structure. A half-scale model of the RFQ has been fabricated and cold-model RF-tests confirm the design parameters. The beam dynamics and RF-structure design of the RFQ along with the results of the cold model tests are presented.

Design and development of a radio frequency quadrupole linac postaccelerator for the Variable Energy Cyclotron Center rare ion beam project.

Abstract: A four-rod type heavy-ion radio frequency quadrupole (RFQ) linac has been designed, constructed, and tested for the rare ion beam (RIB) facility project at VECC. Designed for cw operation, this RFQ is the first postaccelerator in the RIB beam line. It will accelerate A/q≤14 heavy ions coming from the ion source to the energy of around 100 keV/u for subsequent acceleration in a number of Interdigital H-Linac. Operating at a resonance frequency of 37.83 MHz, maximum intervane voltage of around 54 kV will be needed to achieve the final energy over a vane length of 3.12 m for a power loss of 35 kW. In the first beam tests, transmission efficiency of about 90% was measured at the QQ focus after the RFQ for O5+ beam. In this article the design of the RFQ including the effect of vane modulation on the rf characteristics and results of beam tests will be presented.

Design of LINAC post-accelerator for VECC RIB facility using realistic field

Abstract: Variable Energy Cyclotron Centre (VECC) is presently developing an Isotope Separator On-Line (ISOL) post-accelerator type of Radioactive Ion Beam (RIB) facility. The facility is planned around the existing K = 1 3 0 room temperature cyclotron as the primary accelerator and RFQ and LINAC as the post-accelerators for the ion beams. The following report presents the beam dynamics design of the first three LINAC cavities to accelerate RIBs up to about 400 keV/u along with the results of the RF structure studies on the cold model of the first LINAC tank. The mechanical engineering design aspects of the first LINAC tank have also been discussed.

Theory and Design of Charged Particle Beams

Abstract: Review of Charged Particle Dynamics. Beam Optics and Focusing Systems Without Space Charge. Linear Beam Optics with Space Charge. Self-Consistent Theory of Beams. Emittance Variation. Beam Physics Research from 1993 to 2007. Appendices. List of Frequently Used Symbols. Bibliography. Index.

In-flight RI beam separator BigRIPS at RIKEN and elsewhere in Japan

Abstract: Presented are features of the in-flight radioactive isotope (RI) beam separators in Japan as well as of a next-generation separator BigRIPS being built at RIKEN for the RI-beam factory project. Characteristic features and present status of the existing separators are reviewed for the RIPS at RIKEN, the Secondary Beam Line at RCNP, the Secondary Beam Course at NIRS, the CRIB at CNS and the RMS at JAERI. Design features are outlined for the BigRIPS, which is characterized by two major features: large acceptances and a tandem (or two-stage) separator scheme. The large acceptances allow one to produce RI beams efficiently by using in-flight fission of uranium ions, being achieved by using superconducting quadrupoles with a large aperture. The tandem separator scheme allows one to deliver tagged RI beam. The integrated capability of the BigRIPS and the accelerators of the project can significantly enlarge the scope of future RI-beam experiments. A low-energy course following the BigRIPS can provide energy-degraded and -bunched RI beams to be applied for a gas catcher system with an RF ion guide, aiming at realizing a projectile fragmentation based ISOL system.