The OP said
"I have a DC source (lets say 50v)..."
Chuck said
"If the DC source is a constant-current source..."
Here, Chuck has already confused the issue by completely changing the setup given by the OP.
Chuck then goes on to say:
"Since each "pulse" provides a fixed quantity of charge, and since V=Q/C, (delta V) = (delta Q)/C."
Which further confuses the issue, because, with a constant-current source, no pulsing is necessary or relevant to the OP's original question and setup.
Stating that "Since each "pulse" provides a fixed quantity of charge, and since V=Q/C, (delta V) = (delta Q)/C." simply obfuscates that Chuck has replaced the constant 50 volt supply by one that is (automatically) ramping up its voltage, and thus is increasing the voltage on the capacitor.
The capacitor has little to do with the mechanism by which the constant-current source increases the supplied voltage, and so has little if any relevance to the OP's question.
Chuck then tells me:
"...invalid explanations have made you hypercautious..."
No, Chuck invalid explanations, especially wordy ones, cause a visceral reaction, not related to "caution".
The plain fact is that the OP most likely had some idea of a voltage doubler in mind via a switching arrangement of charging capacitor(s).
Re-casting the whole discussion into a constant-current source distorts it and certainly does not simplify anything relevant to the OP's question.
Chuck then tells me:
"...raise specific questions about an explanation..."
No question raised by me. Rather a comment -- the OP asked about apples
*, you told him about oranges **.
** Constant current
--- Joe