Procedure of the AC Dipole Measurements. Ryoichi Miyamoto Last Update 10/21/2008. This note explains how to make measurements with the Tevatron Vertical AC Dipole System from the Main Control Room. 1. Magnet Setup at E17 Service Building. To be safe, go to the E17 service
Last Update 10/21/2008
This note explains how to make measurements
with the Tevatron Vertical AC Dipole System
from the Main Control Room.
To be safe, go to the E17 service
building and turn off the DC
power supply used in the pinger
The plot shows a list of
useful AcNet parameters
to monitor, during the
AC dipole study. The
flying wires can be used
Switch the magnet to the AC dipole mode (negative polarity, displayed as “A”).
Change the timing of T:VPNGAD to 1.191 sec. The difference between C:EVTDAX and T:VPNGAD should be 0.01−0.02 sec or 500−1000 rev.
Arm T:VPNGAD to the 4C event.
After a study, set the parameters to the original values.
Reboot T42 in each measurement.
Choose the BPM’s to be used.
Note that acquiring all the BPM
data takes about 4.5 min. Just for
a testing, use a small number of
Data acquisition is done from
For “Trigger Selection”, choose
“New Triggered Data Only,
Make sure that the kicking is
disabled and plotting is enabled.
“Get Data” starts the acquisition.
After the data acquisition, T42
automatically plots TBT data.
We can change the BPM.
We can plot the TBT or tune.
We can change the axesranges.
Select “Plot” for re-plotting.
BPM’s data can be saved from the
I usually disable the “header” and “status” information.
My Mathematica codes read
horizontal and vertical data
separately. The unit should be
Intensity may not be necessary.
“Write” uploads text files into a
The name of the directory is
yymmdd_time, 080930_1411 in
Note: the revolution frequency at 150 GeV is 47.7122012579 kHz.
Note: the revolution frequency at 980 GeV is 47.7131060198 kHz.