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v11	v12
12	12	the collsion plate. The postitive electrode tube has to be protected by the incident beam, so a grounded shielding tube protects the
13	13	postive tube from the beam. The cup must be calibrated because with different vacuum conditions the amount of electrons that come off
14		of the collision plate can change.
	14	of the collision plate can change. All parts were made of stainless steel.
15	15
16	16	The length of the positive electrode tube should be at least 2 times the diameter.