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-              v10
+              v11
 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.
+the collsion plate. The postitive electrode tube has to be protected by the incident beam, so a grounded shielding tube protects the
+postive tube from the beam. The cup must be calibrated because with different vacuum conditions the amount of electrons that come off
+of the collision plate can change.
+The length of the positive electrode tube should be at least 2 times the diameter.
+This cup needs to be calibrated for the number of secndary electrons to incident neutral particles.
+This ratio is referred to as Gamma. Typical values of Gamma in other designs range from 1 to 1.5.
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