Abstract
A purification system based on reduced copper and molecular sieve has been built for a 7 m 3 liquid argon time projection chamber and it has been succesfully tested. After the initial purification an attenuation length of 0.7 m at 0.5 kV cm −1 was measured by drifting electrons over distances up to 28 cm. Further purification yielded attenuation lengths ≥ 3.7 m at 0.5 kV cm − which corresponds to an impurity level of ≤ 0.2 ppb oxygen equivalent.
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