| Paper |
Title |
Page |
| PM19 |
The Dynamic Tracking Acquisition System for DAΦNE e+/e--Collider
|
213 |
| |
- A. Drago, A. Stella, M. Serio
INFN-LNF, Laboratori Nazionali di Frascati, Frascati, Italy
|
|
| |
The goal of this paper is to describe the dynamic tracking acquisition
system implemented for the DAΦNE e+/e--collider at LNF/INFN. We have
been using the system since last year and it has been possible to collect
useful information to tune-up the machine.
A four-button BPM is used to obtain the sum and difference signals in
both the transverse planes. The signals are acquired and recorded by a
LeCroy LC574A oscilloscope with the capability to sample the input
waveforms using a beam synchronous external clock generated by the DaFne
Timing System. The start of acquisition is synchronised to a horizontal
kick given by an injection kicker. After capturing up to 5000 consecutive
turns, data are sent through a GPIB interface to a PC, for processing,
presentation and storage. A calibration routine permits to convert
voltage data to millimeters values. The acquisition and control program
first shows the decay time in number of turns. Then it draws a trajectory
in the phase space (position and speed) in both the transverse planes. To
do this the software builds a data vector relative to a second "virtual"
monitor advanced by 90 degrees. This is done by two alternative ways:
applying the Hilbert transform or using the transport matrix method.
Examples of data acquired during the collider tune-up are shown.
|
|