Power Supply Report
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3 page review of the system proposed
The delivered prototypes (a short history)
Prototype Qualification
System Test Setup (TIB)
First Results from the System Test
PS Status Report
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Proposed System
•Detector modules powered in parallel at a relatively
long distance (~ 120 m) from the PS.
–Group detectors together (up to 60 APVs)
–Use sense wires to regulate voltages on the load (LV only)
Implies
•High Currents (10 Amps)
•Relatively high voltage drops (4V)
•Efficiency issues (variable loads)
•Isolation at HF of the PS
Why 120 m ?
•Place PS in a “safe” environment
•PS always accessible
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System Architecture
Controller
•A PSM houses 2-4 PSUs and
their control logic.
•PSMs share the +48 V supplied PSM
by Power Units ( PU).
•PSMs are grouped in crates (910 PSM/crate )
•The PSM rack ( PSM array ) is
driven by one dedicated
Controller, which is interfaced
to the CMS Slow Control
Power
Unit
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The Prototype PSU
• PWM (Switching PS)
– (less power dissipation
in the PSU)
• 2 HV generators
– (extra flexibility for
detector biasing inside
a given group)
• Relay switches
– (disconnect the cable
from the PSU)
• Low stray capacitance
transformers
– Improve HF isolation
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Short History (1)
• Project given the go ahead 20th April 2000
• Prototypes ordered:
– October 2000 (CAEN), December 2000 (LABEN)
• First release: (many iterations between Fi and manufacturers)
– June 2001 (CAEN), November 2001 (LABEN)
• June 2001, Torino releases its test box
• Prototypes returned to the manufacturers for
rework concerning isolation, stability, behavior
during transients
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Short History (2)
• CAEN prototype back at the
beginning of 2002, isolation improved
plus other fixes
• Given to Torino for testing (plus
debugging of the test box)
• April 2002, first results presented
for CAEN (still some problems with transient behaviour)
• May 2002, CAEN modifies prototype
(shorter response time plus “crow bar”), LABEN
delivers its revised prototype.
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Old Slide (May 2002)
• LABEN prototype tested in Florence,
CAEN in Turin (an exact repeat of the testing
sequence performed on the earlier version with the Turin
test box)
• Both manufacturers readily answered
queries and sent personnel to Turin and
Florence to solve minor issues.
The work done by both manufacturers is evident
in the progress made both for what concerns
the prototypes functionality and the over-voltage
and over-current behaviour.
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Short History (3)
• May 2002 LABEN takes prototype in Milan
• June 2002, CAEN prototype back from
Torino
• July 2002, LABEN prototype back from the
manufacturer
In the meanwhile in Florence we have:
•developed various cable prototypes
•developed ( help from Torino) a fast switched load
•assembled and debugged the first all optical +
CCU25, silicon module readout
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CAEN prototype
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Based on existing SYxxxx solution
ONE PSU per board (2 boards delivered)
Prototype at the level of an evaluation board
Software in good shape
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Developed from scratch
TWO PSUs per board (2 boards delivered)
Prototype at “final” engineering stage
Software in its infancy (euphemistic)
LABEN prototype
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CAEN prototype
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LABEN prototype
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Qualification
(the procedure)
• Use of “traditional” lab equipment
• Gain an understanding of the measurement
complexities
• Appraise the performance of the PS
prototypes
• Subsequently use the Torino automated
test fixture for detailed repetitive and/or
long term measurements
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Qualification
(the hardware)
Laben crate
The basics:
• Static loads
• MOS switched loads
• LCR meter(s)
• Digital scope(s)
• Cables
CAEN crate
PS are floating ?
• Careful screening
• Well defined grounding
• Differential measurements
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NOISE Measurements
•BW < 20 MHz
•Small capacitors 22 uF
•Noise @ 6 Amps (2.5V) and 4 Amps (1.25V),
depends very little on drawn current
•Measurements shown are with 50 metre
cable (ext. 12 mm)
•Adding another 100 metre doesn’t change
much (seems to have a beneficial effect)
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LABEN
(LV Noise)
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LABEN
(HV noise)
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LABEN
(Transients 1.25V)
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LABEN
(Transients 2.5V)
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LABEN
(Isolation)
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LABEN
(comments)
• Stable behaviour (independent of load and cable length)
• Noise, is it acceptable ? (Especially HV)
• Transient behaviour generally very good
(current limits, etc.); can the response time to
voltage overshoots be bettered still ?
• Isolation is impressive,
capacitive behaviour
showing an understood
• Prototype designed with final engineering
in mind
• Software not only a problem of looks, but
essential parts (like trip and ramping
procedures) missing.
(A. Bocci in Florence is working20
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on it)
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CAEN
(LV noise, 2.5V)
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CAEN
(LV noise, 1.25V)
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CAEN
(HV noise)
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CAEN
(Transients 1.25V)
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CAEN
(Transients 2.5V)
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CAEN
(Isolation)
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CAEN
(comments)
• “Stable” behaviour (except for the 1.25V which is dependent of
load and perhaps cable length, but can be fixed)
• Excellent Noise performance
• Transient behaviour generally good (current
limits, etc.) there is an exception in a “pathological” condition.
• Isolation is good
• Prototype designed as an evaluation board, not
clear how it will scale to engineering stage and how the present
performance depends on the eval. Board arch.
• Software excellent, shows the great amount of
work the company has put in general on PS
systems.
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Where did we start from…
•Noise, current limit,
over voltage, a long
learning curve for
both manufacturers
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Report also for us.
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and
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General Comments
• Prototype qualification is ONGOING
• Results shown are the first, after the
definition of a systematic approach in order
to have a reproducible set of measurements
• We will extend this approach to also include
the Torino test box for repetitive and long
term measurements
Both prototypes substantially answer our specifications as stated in the various
documents we produced. Can they be used for the system test ? YES! (with
caveats)
Above all the prototypes themselves need the system test in
order to be further developed !
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TIB system test
• Not only for PS but “evolving” into a fully
fledged mechanical and electrical test
– NEEDS optical decoupling to achieve
meaningful results
• At first we needed a relatively good
understanding of an optical system
compared to a copper one:
– Many measurements made (Marco Meschini
talk, yesterday at the module test meeting)
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La bara
DOH
CCU25
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Report
Power
distribution
PCB
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La baruccia
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From Marco’s talk (1)
• Front end APV25-s1 on FR4 hybrid, TIB
module, 300 um thick
3 Lasers A.O. Hybrid
12 way
optoreceiver
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From Marco’s talk (2)
Short distance
APV-AOH
Final Kapton cable
could be even shorter
than this one
Input/Output temporary connections on the back of module carrier
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What went inside
• We placed a fixed resistor (5 Ohm value) on
both LV lines
• Modules/Hybrids connected through TIST:
– Straight feed-through of the PS lines
– CMOS buffering (same as used in final string)
• 47uF + 100nF blocking capacitors (per Module)
• HV filter (specially for LABEN, but used also with CAEN)
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What went outside
• Industrial PC dedicated to this test
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two FEDs
one FEC
one TSC
one Digital Optical Transceiver
one Analog Optical Receiver
Plus a battery to supply 5 Volts to the
Digital Opto-Hybrid and CCU ring !
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Software
• “Standard” Module Test software (Lyon)
• Modifications for :
– Laser driver (new version)
– DOH, FEC
– CCU 25
• The software works with two FEDs but
can only address one I2C channel at a time
•Allows direct comparison, with the
module test suite
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Operating conditions
• Inverter out
• MUX 100 Ohms (15 setting)
• AOH, gain 3, bias 18 (new LDD!), 50 Ohm
termination
• Standard M.Raymond parameters for the APV
• 50 metre “internal” + 100 metre “external” cable,
which transports also sense wires and HV lines
• One common grounding point defined on the CCU
ring (la bara is completely isolated from the “outside”)
• The PS are in another room
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Inverter effect
(old CAEN L3)
Inverter out
Inverter in
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All measurements
refer to a hybrid and
a full TIB module
triggered and readout at the same time
ADC counts
The module and the
hybrid survived !
TIB 09, 200V bias
CAEN 150m
ns
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Common Mode with
CAEN TIB09
Deconv
200 V bias
HV filter
Peak
ADC channels
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ADC channels
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Noise profile with CAEN
TIB09,
200 V bias
HV filter
RMS/strip
Deconv
APV strip
RMS/strip
Peak
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APV strip
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Common Mode with
CAEN (2) TIB09
Deconv
200 V bias
NO! HV filter
Peak
ADC channels
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ADC channels
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Common Mode with
LABEN TIB09
Deconv
200 V bias
HV filter
Peak
ADC channels
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ADC channels
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Common Mode with
LABEN (2), Inverter IN
Deconv
TIB09
200 V bias
HV filter
Deconv
ADC channels
In case you weren’t
convinced !
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ADC channels
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Noise profile with
LABEN TIB09,
Deconv
RMS/strip
200 V bias
HV filter
APV strip
RMS/strip
Peak
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APV strip
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Noise profile Hybrid
CAEN - LABEN
LABEN
RMS/strip
The difference is the HV !
APV strip
RMS/strip
CAEN
Deconvolution
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APV strip
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50 mV/div
Hard Reset effects (1)
CAEN,150 metre cable
2.5V-nores
1.25V-0.45Ohm
250 us/div
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50 mV/div
Hard Reset effects (2)
1 ms/div
50 mV/div
LABEN,150 metre
2.5V & 1.25 noresistors
LABEN,150 metre
2.5V & 1.25 5 Ohm
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1 ms/div
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Conclusions
• We have started !
• PS work has given fruit to what we think
is a viable option for the Tracker (next
months will give a definite answer)
• We will keep interacting with CAEN and
LABEN to solve the remaining issues
• The DAQ is stable, (no glitches, no
spurious hard resets !)
• Only two hybrids but ready to read-out
up to 6 simultaneously
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Conclusions (2)
This PS project is a collaboration between
Florence and Torino
The TIB system test between
Florence and Pisa
Thanks to a lot of people (a few names):
– CERN (J. Troska, F. Vasey, S. Marchioro,
C.Paillard, L. Mirabito)
– Perugia (B. Checcucci, M. Brunetti)
– Pisa (Roby Dell’Orso, R. Cecchi)
– Torino (M. Costa, P. Trapani)
Thanks also to F. Maletta, M. Brianzi, E. Scarlini
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System Architecture (1)
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