Power supplies

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Transcript Power supplies

Power supplies
Will
need power supplies to power :
APDs
PMs
Silicon PMs
Signal amplifiers.
Characteristics:
of power requirements.
-12
v; -6v; + 6 v 1 A each for
amplifiers.
Up to 2kV, positive and negative, from 0
up in at least 1V increment for APD, 23mA (for 2-3)
Up to 1.5kV, 10mA for PMT (all 6)
All of above should have the smallest
ripple voltage possible (around 1-4 mV)
High Voltage power supplies
 Model
556 from ametek-online.com
 Double-NIM crate size, from ±10 to
±3000V, 2 output channels.
 10 mA, output voltage remotely controlled
by applying from 0 to 6.5V, noise <10mV
 Not a smooth voltage increments but
rather a step change on voltage – not
good for APDs but sufficient for PMT
 Current price as of 7/4/2003 - $1615.00
HV power supplies
 J4-2P and
J4-2N from Matsusada
Precision Inc.
 2P – positive 2000V, 2N – negative 2kV.
Ripple of 2mV. 2mA output current.
 Voltage regulated by multi-turn built-in
potentiometer or remotely.
 Recommended for APD.
 Non-standard size.
 Current price as of 3/26/2003 is
$252.00 (on picture it’s the left unit)
Low Voltage power supplies
 S7-001
Herbach&Rademan
power supply
(www.herbach.com)
 0 - ±30V (positive and negative
simultaneously, 0.5mV ripple
RMS. Current limit 5A.
 Regulated. Dual Panel meters.
 Current price is $238.95
APD
Box design
#3
#
4
above shows the housing of
APD and not the actual box
which will the shows later.
for cooling the APD
using the peltier elements. This
method will require a current of
few Amps (up to 3-5A) to get
the APD down to about –40
degrees Celsius. (doesn’t
require very stable power
supply. Can use a spare AT
computer power supply.)
Peltier Elements
 Low-cost
– about $35 per each
element or less
 Allows good temperature control, as
precise as 0.1 degree at around 20oC,
 Performance and precision somewhat
degrade at negative temperatures
because the element will require a
large current ( 5A) in that range,
which is not easy to control.
Box design
 The
above shows the right and left
sides of the box that are just
smooth surfaces.
box design of the APD allows up to
two peltier elements for better control and
allowing to achieve lower temperatures
(theoretically down to –30o C or even
lower if 4 elements are used stacked.
 Usage of 2 elements allows to minimize
currents for better controllability and
stability.
Box Design
 The
front side allows two standard optical
connectors to be used for greater flexibility of the
design.
Box Design
 Bottom
and top parts of the box allow the connectors
and holders and the amplifier box to be attached.
Box Design
#8
#6
#13
#5
This is
an “artistic” representation of the box that
will have APD inside and the box with preamplifier (which is not being cooled as of current
scheme but the ability to do this has been
integrated into this particular design).