Phase and synchronous detector theory as applied to beam position and intensity measurements
A popular signal processing technique for beam position measurements uses the principle of amplitude-modulation-to-phase-modulation (AM/PM) conversion and phase detection. This technique processes position-sensitive beam-image-current probe-signals into output signals that are proportional to the beam's position. These same probe signals may be summed and processed in a different fashion to provide output signals that are proportional to the peak beam current. This paper derives the transfer functions for the AM/PM beam position and peak beam current processors.
An RF Beam Position Measurement Module for the Fermilab Energy Doubler
This paper describes the design, realization and performance of the RF Beam Position Measurement Module designed for the Fermilab Energy Doubler. This module measures beam off-axis position and intensity over a 60db dynamic range. For 20 or more contiguous 53MHz beam bunches, the unit will derive a position signal for 108 to 1011 protons per bucket with a position accuracy of ±0.5 mm. Also, the unit will measure the position of 1010 or more protons in a single isolated rf bunch. A beam intensity signal is also generated for triggering purposes. Since 220 of these modules are to be built, cost and performance were optimized. The entire unit is housed in a 1-wide NIM module.
The delta-t tuneup procedure for the Fermilab linac upgrade
The analysis necessary to perform the delta-t procedure for setting module phase and electric field amplitude on the upgraded linac at Fermilab is described. Two distinct delta-t methods are required to tune all of the modules in the linac upgrade. The accuracy and stability of each method have been calculated as a function of linac module number. A procedure for coarse tuning of the linac is also presented. Coarse tuning is necessary to bring the module phase and amplitude into ranges where the delta-t method is accurate and reliable.<<ETX>>