Suppose you want to simulate _all_ the particles in your bunch. How much RAM would that be at 128 bytes/particle?
1pC = 6.24 million particles = 762MB
1nC = 6.24 billion particles = 744GB
1uC = 6.24 trillion particles = 727TB

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Why 128 bytes? Well 6-dimensional phase space with double precision values is only 48 bytes, but other book-keeping data (decay times, particle species etc.) tends to grow it. In the case of @[email protected]
, the structure is 124 bytes in total.

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