[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7921
Development of Nanometer Resolution C-Band Radio Frequency Beam
Position Monitors in the Final Focus Test Beam
Abstract
Using a 47 GeV electron beam, the Final Focus Test Beam (FFTB)
produces vertical spot sizes around 70 nm [1]. These small beam sizes
introduce an excellent opportunity to develop and test high resolution
Radio Frequency Beam Position Monitors (RF-BPMs). These BPMs are
designed to measure pulse to pulse beam motion (jitter) at a
theoretical resolution of approximately 1 nm [2]. The beam induces a
TM110 mode with an amplitude linearly proportional to its
charge and displacement from the BPM's (cylindrical cavity) axis. The
C-band (5712 MHz) TM110 signal is processed and converted
into beam position for use by the Stanford Linear Collider (SLC)
control system. Presented are the experimental procedures,
acquisition, and analysis of data demonstrating resolution of jitter
near 25 nm. With the design of future e+e-
linear colliders requiring spot sizes close to 3 nm [3], understanding
and developing RF-BPMs will be essential in resolving and controlling
jitter.
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