What is the monthly phase/amplitude beam control tolerance?

• A. 1%
• B. Functional
• C. ±1 mm
• D. 2%

Answer: (B)

Phase and amplitude control deals with how the RF field timing and strength keep the beam synchronized and stable. For monthly QA, the tolerance is described as functional, meaning the requirement is that the control system remains capable of delivering the beam within its intended functional performance, rather than fitting a single numeric value. In other words, you verify that the phase alignment and amplitude regulation behave correctly and stay within the machine’s approved functional envelope, as defined by the vendor and commissioning data. Numeric percentages or a distance like millimeters would imply fixed bounds, which isn’t how this monthly check is specified.