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-              v9
+              v10
 Here are the drawings for a neutral cup that will be installed soon that
 will be installed to monitor the neutral H atom beam.
+The Neutral cup measures our neutral H atom current. This is done by measuring the secondary electrons that are
+splashed off by H atoms crashing into a collision plate. The plate is within a tube which will have a positive potential
+on it (+300-400 V). The secondary electrons are sucked onto this tube and the resulting positive current is read off of
+the collsion plate. The postitive tube has to be protected by the incident beam, so a grounded shielding tube protects the
+postive tube from the beam.
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 [[Image(https://docs.astro.columbia.edu/attachment/wiki/SavinGroup/MergedBeams/EndSection/Neutral%20Cup%20side%20view%20with%20notes.jpg?format=raw, 50%)]]