RPC & XPC Electronics Status
Front End Boards (FEBs)
 Controllers
 HV system
 Crates & Racks

Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
1
FEB prototype
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
2
FEB block schematic
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
3
Front End Discriminator
LVDS receiver
 Very cheap
 High density
Flavio Dal Corso - INFN Padova


High speed
Moderate CMRR (~2 V)
OPERA coll. meeting - Hamburg 3 July 2004
4
Discriminator Performances
Slope Distribution
Discriminator Linearity
=0.003
20
400
y = 0,9658x + 11,338
15
Counts
200
100
5
0
400
-400
-0,962
-0,964
-0,966
-0,968
-300
-0,970
-200
-0,972
0
-0,974
200
-0,976
-100 0
-0,978
-200
-0,980
-400
10
-0,982
Actual Thr (mV)
300
Offset Distribution
Nominal Thr (mV)
=4.1 mV
Counts
15
Linearity Residuals
1,00
10
5
400
-1,00
mV
mV
Flavio Dal Corso - INFN Padova
18,5
300
16,5
200
14,5
100
12,5
0
10,5
-0,50
8,5
-100
6,5
-200
4,5
-300
2,5
-400
0,5
0
0,00
-1,5
mV
0,50
OPERA coll. meeting - Hamburg 3 July 2004
5
RPC Strip’s Signals
(First measurements done underground)
strip signal
0,2

0,15
0,1
0,05
0
1
921
1841 2761 3681 4601 5521 6441 7361 8281 9201
-0,05
ground signal
-0,1
0,12

0,1
0,08
0,06
0,04
0,02
0
-0,02 1
919
1837 2755 3673 4591 5509 6427 7345 8263 9181
-0,04
-0,06
-0,08
difference
0,15
0,1

Ground connection
not the best possible
(not yet the final
layout).
Ground noise well
within CM range.
Difference signal
immune from ground
noise
0,05
0
1
229 457 685 913 1141 1369 1597 1825 2053 2281 2509 2737 2965
-0,05
-0,1
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
6
FEB status
Prototype (almost) finished.
 10 prototypes will be mounted in the
next few weeks, to be tested at the
INFN-Napoli test stand with the
Controller.
 Tender for the mass production (~500
boards) awaiting for test results.

Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
7
Controller status


Prototype
finished, without
“Mezzanine”.
Tested at INFN
Napoli with a FEB
emulator.
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
8
HV system




3 SYS-127 (available).
33 (4 ch.) positive modules (available).
11 (4 ch.) negative modules (available).
8 (~40 ch. each) I-meter (home made by
INFN-Frascati), almost ready.
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
9
RPC & XPC cable layout
3 + 6 boards x plane
Flavio Dal Corso - INFN Padova
6 + 6 boards x plane
OPERA coll. meeting - Hamburg 3 July 2004
10
Racks layout
16 Racks (old MACRO crates), with modification (water cooling
and power management). Works in progress.
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
11
Crates layout
(for one spectrometer)
RACK 1
RACK 3
RACK 2
RACK 4
Power
Management
Power
Management
Power
Management
Power
Management
TIMING
RPC
RADIATORE
RADIATORE
CONTROLLER
RADIATORE
RADIATORE
RACK 5
RACK 7
RACK 6
RACK 8
Power
Management
Power
Management
Power
Management
Power
Management
CONTROLLER
RPC
RADIATORE
RADIATORE
RADIATORE
RADIATORE
SLOW
CONTROL
XPC
RPC
RPC
RPC
RPC
RPC
RPC
RPC
SLOW
CONTROL
RPC
I Meter
RADIATORE
RADIATORE
RADIATORE
RADIATORE
RADIATORE
SYS 127 +
Flavio Dal Corso - INFN Padova
RADIATORE
RADIATORE
I Meter
I Meter
RPC
RADIATORE
XPC
RPC
I Meter
I Meter
I Meter
I Meter
I Meter
SYS 127 -
OPERA coll. meeting - Hamburg 3 July 2004
SYS 127 +
12
Custom Crates
(FEBs and Controllers)




Standard VME crates, with custom backplane.
4 crates for XPC
24 crates for RPC
4 crates for Controllers
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
13
Custom Crates
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
14
Custom Crates
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
15
All the crates and
backplanes are already
available;
mounting in progress.
Flavio Dal Corso - INFN Padova
OPERA coll. meeting - Hamburg 3 July 2004
16