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Title: 33.7 MHz heavy-ion radio frequency quadrupole linac at VECC Kolkata

Abstract

A 33.7 MHz heavy-ion radio frequency quadrupole (RFQ) linear accelerator has been designed, built, and tested. It is a four-rod-type RFQ designed for acceleration of 1.38 keV/u, q/A{>=}1/16 ions to about 29 keV/u. Transmission efficiencies of about 85% and 80% have been measured for the unanalyzed and analyzed beams, respectively, of oxygen ({sup 16}O{sup 2+}, {sup 16}O{sup 3+}, {sup 16}O{sup 4+}), nitrogen ({sup 14}N{sup 3+}, {sup 14}N{sup 4+}), and argon ({sup 40}Ar{sup 4+}). The system design and measurements along with results of beam acceleration test will be presented.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Variable Energy Cyclotron Centre (VECC), 1/AF, Bidhannagar, Kolkata 700064 (India)
Publication Date:
OSTI Identifier:
20953411
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 4; Other Information: DOI: 10.1063/1.2727457; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; ARGON; DESIGN; EFFICIENCY; HEAVY IONS; ION BEAMS; KEV RANGE; MHZ RANGE; NITROGEN; OXYGEN; QUADRUPOLE LINACS

Citation Formats

Chakrabarti, Alok, Naik, Vaishali, Dechoudhury, Siddhartha, Bandyopadhyay, Arup, Mondal, Manas, Pandey, Hemendra Kumar, Roy, Tapatee Kundu, Sanyal, Dirtha, and Bhowmick, Debasis. 33.7 MHz heavy-ion radio frequency quadrupole linac at VECC Kolkata. United States: N. p., 2007. Web. doi:10.1063/1.2727457.
Chakrabarti, Alok, Naik, Vaishali, Dechoudhury, Siddhartha, Bandyopadhyay, Arup, Mondal, Manas, Pandey, Hemendra Kumar, Roy, Tapatee Kundu, Sanyal, Dirtha, & Bhowmick, Debasis. 33.7 MHz heavy-ion radio frequency quadrupole linac at VECC Kolkata. United States. doi:10.1063/1.2727457.
Chakrabarti, Alok, Naik, Vaishali, Dechoudhury, Siddhartha, Bandyopadhyay, Arup, Mondal, Manas, Pandey, Hemendra Kumar, Roy, Tapatee Kundu, Sanyal, Dirtha, and Bhowmick, Debasis. Sun . "33.7 MHz heavy-ion radio frequency quadrupole linac at VECC Kolkata". United States. doi:10.1063/1.2727457.
@article{osti_20953411,
title = {33.7 MHz heavy-ion radio frequency quadrupole linac at VECC Kolkata},
author = {Chakrabarti, Alok and Naik, Vaishali and Dechoudhury, Siddhartha and Bandyopadhyay, Arup and Mondal, Manas and Pandey, Hemendra Kumar and Roy, Tapatee Kundu and Sanyal, Dirtha and Bhowmick, Debasis},
abstractNote = {A 33.7 MHz heavy-ion radio frequency quadrupole (RFQ) linear accelerator has been designed, built, and tested. It is a four-rod-type RFQ designed for acceleration of 1.38 keV/u, q/A{>=}1/16 ions to about 29 keV/u. Transmission efficiencies of about 85% and 80% have been measured for the unanalyzed and analyzed beams, respectively, of oxygen ({sup 16}O{sup 2+}, {sup 16}O{sup 3+}, {sup 16}O{sup 4+}), nitrogen ({sup 14}N{sup 3+}, {sup 14}N{sup 4+}), and argon ({sup 40}Ar{sup 4+}). The system design and measurements along with results of beam acceleration test will be presented.},
doi = {10.1063/1.2727457},
journal = {Review of Scientific Instruments},
number = 4,
volume = 78,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • 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 powermore » loss of 35 kW. In the first beam tests, transmission efficiency of about 90% was measured at the QQ focus after the RFQ for O{sup 5+} 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.« less
  • We developed a laser ion source using a direct plasma injection scheme (DPIS) as an injection system for a two-beam type radio frequency quadrupole (RFQ) linac with an interdigital-H (IH) type cavity. The laser ion source in the DPIS is directly connected to the RFQ cavity without the low energy beam transport system. We achieved a high current C{sup 2+} beam above 60 mA per beam channel from the ion source. The beam will be injected to the two-beam type IH-RFQ linac, and the linac will generate a beam current of approximately 44 mA per beam channel.
  • A new type of linear accelerator, the radio-frequency quadrupole (RFQ) linac, is being developed for the acceleration of low-velocity ions. The RFQ accelerator can be adapted to any high-current applications. A recent experimental test carried out at the Los Alamos Scienific Laboratory (LASL) has demonstrated the outstandig properties of RFQ systems. The test linac accepts a 30-mA proton beam of 100-keV energy and focuses, bunches, and accelerates the beam to an energy to 640 keV. This ia done in a length of 1.1 m, with a transmission efficiency of 87% and with a radial emittance growth of less than 60%.more » The proven capability of the RFQ linac, when extended to heavy ion acceleration, should provide an ideal technique for use in the low-velocity portion of a heavy-ion linac for inertial-confinement fusion. A specific concept for such an RFQ-based system is described.« less
  • Variable Energy Cyclotron Centre has commissioned a K-500 superconducting cyclotron for various types of nuclear physics experiments. The 3-phase radio-frequency system of superconducting cyclotron has been developed in the frequency range 9-27 MHz with amplitude and phase stability of 100 ppm and {+-}0.2{sup 0}, respectively. The analysis of the RF cavity has been carried out using 3D Computer Simulation Technology (CST) Microwave Studio code and various RF parameters and accelerating voltages ('Dee' voltage) are calculated from simulation. During the RF system commissioning, measurement of different RF parameters has been done and absolute Dee voltage has been calibrated using a CdTemore » X-ray detector along with its accessories and known X-ray source. The present paper discusses about the measured data and the simulation result.« less
  • Variable Energy Cyclotron Centre (VECC) has commissioned K500 Superconducting cyclotron (SCC) based on MSU and Texas A and M university cyclotrons. The radio frequency (RF) system of SCC has been commissioned with the stringent requirement of various RF parameters. The three-phase RF system of Superconducting cyclotron has been developed in the frequency range 9–27 MHz with amplitude and phase stability of 100 ppm and ±0.1°, respectively. The phase control system has the option to change the relative phase difference between any two RF cavities and maintain the phase stability within ±0.1° during round-the-clock cyclotron operation. The said precision phase loopmore » consists of both analogue In-phase/Quadrature modulator to achieve faster response and also Direct Digital Synthesis based phase shifter to achieve wide dynamic range as well. This paper discusses detail insights into the various issues of phase control for the K500 SCC at VECC, Kolkata.« less