BEST
User’s Manual
BEST System Installation
17
The
TetrAMM
unit must be placed as close as possible to the analog current
source (e.g. phBPM detector), in order to reduce cable lengths – i.e. cable
capacitance – and to minimize consequent noise pick-up
.
It is also highly
recommended to use high quality BNC cables to connect the
TetrAMM
inputs
with the current sources.
Depending on the
TetrAMM
custom model selected, the
TetrAMM
can be
equipped with a High Voltage bias module (up to +/- 4kV, monopolar) or with a Low
Voltage bias module (up to +/- 30 V, bipolar). These bias voltage modules can be
used as bias/polarization source for the position-sensing system (e.g.: split ion
chamber, diamond QBPM…). The Low Voltage bias module has a standard BNC
output connector, while the High Voltage bias module has a SHV output connector.
The SHV connector is similar to the BNC but uses a very thick and protruding
insulator (
Figure 9
). The insulation geometry makes the SHV connector safe for
handling high voltage sources, by preventing accidental contact with the live
conductor in an unmated connector or plug.
Figure 9
: High Voltage SHV connector
2.2
Connect the PreDAC
to the Beamline
optics
The
BEST
suite is usually driving several beamline optics units in order to control
and stabilize the X-ray beam at the desired position and with the desired intensity.
This task is performed by the
PreDAC
device. This unit is designed to control the
piezo/amplifier of the piezoelectric actuators that drive the position of the beamline
optical elements and therefore the position of the X-ray beam. The
PreDAC
device
is designed to provide maximum flexibility in order to tailor its output to a wide
variety of piezoelectric actuators. The number of
PreDAC
outputs depends upon
High Voltage
SHV connector