Low-energetic alpha particles will capture electrons quickly, and you get regular helium atoms. Their energy depends on the temperature, but they are not visible in your cloud chamber anyway.
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there are no electrons in this environment
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You cannot build a cloud chamber without electrons.
To get thermal, ionized alpha particles, you need a very hot plasma (something like 100 000 Kelvin) - and even there, you need electrons or the plasma will fly apart. An extremely low density in an extremely good vacuum and a very short timescale might work, too. Nothing you can reproduce with your experiments, however.