The folded tandem ion accelerator (FOTIA) project at BARC has been commissioned.The analysed carbon beams of 40 nA(3 · ) and 25 nA(4 · ), at terminal voltage of 2.5 MV with N¾ · CO¾ as insulating gas, were obtained. The beams were characterized by performing the Rutherford back scattering (RBS) on gold, tin and iron targets. The beam energy of 12.5 MeV for ½¾ C · was consistent with the terminal voltage of 2.5 MV. The N¾ · CO¾ mixture is being replaced by SF gas in order to achieve 6 MV on the terminal. In this paper, some of the salient features of the FOTIA and its present status are discussed.
We have performed detailed electromagnetic and beam
dynamics studies of a 352.21 MHz drift-tube linac (DTL) that will accelerate
a 30 mA CW proton beam from 3 to 20 MeV. At such high currents space charge
effects are important, and therefore the effect of linear as well as
non-linear space charge has been studied (corresponding to uniform and
Gaussian initial beam distributions), in order to avoid space charge
instabilities. To validate the electromagnetic simulations, a 1.2 m long
prototype of the DTL was fabricated. RF measurements performed on the
prototype were in good agreement with the simulations. A detailed simulation
study of beam halos was also performed, which showed that beyond a current
of 10 mA, significant longitudinal beam halos are excited even for a
perfectly matched beam, whereas for a mis-matched beam transverse beam halos
are also excited. However, these do not lead to any beam loss within the
DTL.
The folded tandem ion accelerator (FOTIA) facility set up at BARC has become operational. At present, it is used for elemental analysis studies using the Rutherford backscattering technique. The beams of 1 H, 7 Li, 12 C, 16 O and 19 F have been accelerated up to terminal voltages of about 3 MV and are available for experiments. The terminal voltage is stable within ¦2 kV. In this paper, present status of the FOTIA and future plans are discussed.
The beam optics of the 6 MV folded tandem ion accelerator, that has recently been commissioned at Bhabha Atomic Research Centre, Mumbai, is presented. Typical beam trajectories for proton and 12 C beams under different conditions, are shown. The constraints on the design due to the use of the infrastructure of the Van de Graaff accelerator, which existed earlier, are discussed.
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