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| Kleinstein:
A cyclotron tends to need quite some magnet, e.g. similar to the magnet used for the permanent magnet NMR. I would not call that pocket size. The question is more if it is light enough to be in the desk top category. A point with the omegatron is that it usually includes the electron beam to generate the ions. |
| ChristofferB:
One of Craddock's first cyclotrons, this cutie, was operated at fairly low fields, i believe. You're right the modern ICR-MS's uses a superconducting magnet, and a fairly high RF freq., but I believe the omegatrons was all the way down in the 1-2 MHz, and with just a small ceramic magnet on each side. |
| Kleinstein:
The datasheet for the Phillips tube gives a magnetic field of some 0.4 T as an example - it does not need superconductors, but still a sizable magnet. The relatively flat form factor of the old one from Craddock suggest that it is made to work inside a sizable magnet with a field back to front (or the other way). The vacuum / tube part can be relatively small and portable, but the magnet may need wheels. |
| ChristofferB:
The old non-superconducting research magnets commonly used for CW-NMR and EPR, as well as small cyclotrons are indeed huge, and usually water-cooled. The omegatrons however, apparantly not so. I found a design with ferrous magnets something like 3cm in diameter! I believe one of the main visions for omegatron MS's was upper atmosphere research, so it was designed with rocket/balloon payload-ism in mind. |
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