Cyclotron Internal Ion Source with DC Extraction

Mallory, M. L.; Hudson, E. D.; Lord, R. S.

doi:10.1109/tns.1973.4327067

Cited by 3 publications

(1 citation statement)

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“…Calculated transit times of harmonic beams crossing the ion source to dee gap 3 In order to verify that two beams were being accelerated to the maximum radius of ORIC, the beams were extracted and scattered from a gold foil into a solid state detector where the energy deposited in the detector was used to identify the beams. The results of the first "two-beam" experiment on ORIC, where only the voltage of the electrostatic deflector was varied by the theoretical amount, is shown in Fig.…”

Section: Harmonic Beam Accelerating Experimentsmentioning

confidence: 99%

Isochronous Cyclotron Harmonic Beam Experiments

Mallory

Hudson

Lord

1975

IEEE Trans. Nucl. Sci.

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We have previously described a system for boosting the energy of heavy ions in isochronous cyclotrons by recycling. 1This system requires simultaneous acceleration of two beans on different harmonics, all-magnetic extraction, external separation, and reinjection of the lower energy beam. The first three requirements have now Been demonstrated on a limited scale using simultaneous beans frora an internal ion source, and without building a reinjection system. A 6 Li 1+ beam on the third harmonic at an energy of 4 MeV and a e Li 3 * beam on the fundamental at an energy of 36 MeV were simultaneously accelerated on the Oak Ridge Isochronous Cyclotron {OHIO, extracted and separated, demonstrating the major principles of recycle without closing the loop. IntroductionWe have investigated the feasibility of simultaneous harmonic acceleration of two beams (recycle) in the ORIC and found this acceleration mode theoretically possible' The harmonic acceleration concept and the engineering changes needed on QRIC to implement recycle acceleration ure illustrated in Fig. 1. The high harmonic (or first pass) beam originates at the ion source located in the renter of ORIC. This beam is accelerated to the extraction radius of the cyclotron and is extracted by an all-magnetic extraction system followed by a velocity selector. In the electrostatic velocity selector the first pass beam is deflected down and away from the present beam extraction path. An external septum magnet further separates the first pass beam and steers it to a beam transport system that is located approximately 25 cm above the floor of the ORIC vault. At this level the beam is transmitted to a three-component 180° bending magnet that controls the beam phase by varying its path length. At the exit of the 180° magnet the beam enters the injection system path, 2 and passes through an inflection magnet and then stripped to a higher charge state by a carbon stripping foil, located between the turns of the first pass beam. The higher charge state that satisfies the harmonic requirements is reaccelerated, enters the extraction system, and is directed into the existing beam transport system of ORIC. The complete engineering changes needed to demonstrate recycle on ORIC require major modifications. The septum magnet, replaces the present electrostatic deflector. A velocity selector and a beam transport system to reinject the first pass beam must bs built. Experiments that verify the recycling accelerating concepts have been made without modifying ORIC. Harmonic Beam Accelerating ExperimentBeams of the same mass and of a different charge state, for example, 16 0 6 , on the first harmonic and '^O 2 * on the third harmonic, were accelerated simultaneously or. ORIC. To accomplish the simultaneous acceleration of two beams from the ion source to full radius requires a special beam phase history 3 because of the relativistic mass difference between the two beams.Calculated transit times of harmonic beams crossing the ion source to dee gap 3 are plotted in Fig. 2 In order to ve...

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Section: Harmonic Beam Accelerating Experimentsmentioning

confidence: 99%