1. RPC HV-LV project Introduction RPC description Requirements
I.N.F.N. Naples
Alfonso Boiano1, Flavio Loddo2, Pierluigi Paolucci1, Antonio Ranieri2
1) I.N.F.N. of Naples, 2) I.N.F.N. of Bari
Introduction
RPC description
Requirements
SASY 2000 project
Prototype tests
Project description
cables and connectors
Cost estimation
Schedule
Conclusions
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2. Pierluigi Paolucci - I.N.F.N. Naples
Introduction I
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The RPC detectors will be equipped with a large part of the HV-LV system placed in a “not accessible area”.
The HV “remote hardware” will be placed in the UXC zone, around the detector, and it will be accessible just in some dedicated period.
The system will work in very hard conditions due to the high magnetic field and high radiation environment.
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3. Pierluigi Paolucci - I.N.F.N. Naples
Introduction II
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A common project (SASY 2000) for the HV-LV RPC systems for LHC is going on between the I.N.F.N. and the CAEN company.
A first prototype has been delivered on June 2002 and is now under tests.
A lot of different tests will be performed on the CMS HV-LV RPC system:
Magnetic field test (CERN)
Radiation test (Louvain la Neuve)
High Stress test (Naples)
Long term test (Naples/Bari)
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4. RPC detector description I
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Barrel
Endcap
It consists of a Barrel (5 wheels) and two Endcap plates
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5. RPC detector description II Each wheel is divided in 12 sectors
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Each wheel is divided in 12 sectors
DT chamber
RB4
RPC - 2 bi-gaps
RPC - 2 bi-gaps
DT chamber
RPC - 2 bi-gaps
RPC - 2 bi-gaps
RB3
bigap
RPC - 3 bi-gaps
RB2
DT chamber
bigap
RPC - 2 bi-gaps
bigap
RPC - 2 bi-gaps
RB1
DT chamber z y
RPC - 2 bi-gaps z
bigap
bigap x
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6. Pierluigi Paolucci - I.N.F.N. Naples
RPC schema
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RB3/RB4
ALV1
DLV1
ALV2
DLV2
HV1
HV2
Bigap
4 RPC gaps
6 front-end boards
6 RPC gaps
18 front-end boards
HV1
HV2
HV3
ALV1,ALV2,ALV3
DLV1,DLV2,DLV3
Bigap
RB2 reference plane
HV1
HV2
ALV1
DLV1
ALV2
DLV2
RB1/RB2in
Bigap
4 RPC gaps
12 front-end boards
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7. Pierluigi Paolucci - I.N.F.N. Naples
RPC HV - LV description
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RB1/RB2in
RPC chamber
Front-End
Bigap
FEB
FEB
FEB
FEB
FEB
Distrib. board
Bigap
FEB
ALV1
DLV1
ALV2
DLV2
ALV Analog Voltage = 7V Working Cur. = 0.42 A
DLV Digital Voltage = 7V Working Cur. = 0.9 A
I2C input
LV+I2C FEB out
LV in
Distributes analog and digital LV
It supplies LV power to 3 FEB chains
It supplies the I2C main line from LB
and one backup line from DT.
Total power/(ALV+DLV) ch.: 1.32 A * 7 V = 9.24 W
Expected Power  120 W/sector  7.2 kW/Barrel
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8. Pierluigi Paolucci - I.N.F.N. Naples
HV - LV numbers
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The barrel system consists of:
wheel 1 2 3 4 5
TOT
chambers
156
780
gaps
408
2040
front-end
936
4680
Now we will describe the HV-LV project in order
to quantify the number of channels we need.
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9. Pierluigi Paolucci - I.N.F.N. Naples
HV – LV requirements
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General:
system working in high magnetic field;
system working in an high radiation environment;
distributed remote system;
floating HV and LV channel (noise reduction).
HV:
15 KV – 1 mA (resolution of 0.1 mA)
LV:
+7 V – 0.42 A (analog) and +7 V – 0.9 A (digital)
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10. Pierluigi Paolucci - I.N.F.N. Naples
SASY2000 project for RPC I
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The aim of the I.N.F.N. – CAEN project is to find a common solution for the RPC HV-LV systems of the LHC experiments.
The SASY2000 project is based on the following ideas:
Mainframe SY1527 (local system – control room);
48 Volts Power Source;
Remote distribution system consisting of a custom 6U crate housing:
2 independent crate controller;
8 HV-LV boards each with 4 HV + 8 LV floating channels
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11. Pierluigi Paolucci - I.N.F.N. Naples
SASY2000 project for RPC II
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Control Room 1 1
Branch controller
From 1 to 16 4 4
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12. SASY2000 project for RPC III
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Detector region
Electronic house 4 8 … 16
HV #1
HV #2
Branch controller #1
Complex ch. 1
256
Remote
boards
LV #1
LV #4
Branch controller #2
HV #1023
HV #1024
Complex ch. 512 …
256
LV #2047
LV #2048
Branch controller #16
What do we need ??
26 ch * 12 sect * 5 wheels = 1560 LV
17 ch * 12 sect * 5 wheels = 1020 HV
One mainframe is enough for the barrel
The remote board has 2 Complex ch. each equipped with: 2 HV ch and 4 LV ch.
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13. Pierluigi Paolucci - I.N.F.N. Naples
RPC HV-LV prototype 0
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The HV-LV CAEN functional prototype consists of: HV board, 3 LV board and 1 controller.
The prototype has been split in three pieces, following a “logical separation” of the system, in order to study the functionality of every single piece and component.
The final HV-LV board will
have 2 complex channel
each with 2 HV + 4 LV
floating channels .
It will be 6U high and 2 slots
width.
After the tests the factory will begin to design the final board
integrating all these components in a single 6U – 2 slots boards.
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14. Pierluigi Paolucci - I.N.F.N. Naples
Test to be performed
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The following tests will be performed on both the prototypes and the final board:
Magnetic field test up to 7 KGauss (at CERN);
Radiation test up to 10 LHC eq-years (at Louvain La Neuve);
Test on the RPC detector to study the noise condition (at the test station in Bari);
High Stress Test to study the system under very hard conditions (in Napoli).
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15. Pierluigi Paolucci - I.N.F.N. Naples
Magnetic field test
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16. Neutron radiation test I
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The SASY2000 HV-LV prototype has been tested for the first time
at the Louvain La Neuve radiation facility in May the 21th.
The total neutron fluency
requested was 2-3 • 1012 n/cm2
for 10 LHC years,
corresponding to about 80 min
with a beam at 1 mA.
The people involved were:
Boiano (NA), Loddo (BA),
Paolucci (NA), Passuello (CAEN)
and Ranieri (BA)
SASY2000
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17. Neutron radiation test II
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The setup consisted of:
CMS SASY2000 prototype placed at 110 cm from the beam;
SY2527 mainframe placed 30 m far from the SASY2000;
Laptop to monitor the system.
The system worked well for 30 min.
corresponding to about 8 • 1012 n/cm2.
Then it lost the communication with the SASY2000 showing some problems on the HV channels.
We took data for all the 80 min in order to analyze every single components after the test.
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18. High Stress Test in Naples
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The High Stress Test is based on a test station designed and built in Naples.
The test station consists of a
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19. High Stress Test in Naples
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The High Stress Test is based on a large number of cycles of the following tests:
Low current (1 mA) test at “working” voltage (10 KV);
Medium range current scan (from 10 to 300 mA) at “working” voltage:
High current (1 mA) test at “working” voltage (10 KV);
Over-current and Trip test (I > 1 mA);
Maximum voltage test (12 KV) at different absorbed currents;
Discharge and short circuit test made with two pins at different distances;
Imon, Vmon calibration test made with an independent volt-meter.
Different HV resistors
A PC running LabVIEW will be used to control the system and to analyze the data.
Final HV-LV cable/connector will be used.
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20. RPC HV-LV final prototype
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The full set of tests of the prototype 0 will finish before the end of the 2002;
If and only if the test results will be very encouraging, showing a very good performances of the HV-LV system the RPC collaboration will order a final prototype;
It consists of a 6U – 2 slots board equipped with 4 HV and 8 LV floating channels.
The final prototype will be produced in about 1 year and it will be tested following the same procedure.
Only after this second step will be possible to start the final production consisting of about 260 remote boards and 2 SY1527 mainframes.
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21. HV-LV architecture for a barrel sector
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26 LV channels Remote Boards HV channels
RB4
4 LV
2 bi-gaps
2 bi-gaps
4 HV ch
1 RB
2 RB
RB3
2 bi-gaps
2 bi-gaps
4 HV ch
4 LV
3 bi-gaps
6 LV ch
3 HV ch
RB2
1 RB
1 RB
4 LV ch
2 bi-gaps
2 HV ch
4 LV ch
2 bi-gaps
2 HV ch
RB1
1 RB
1 RB
4 LV ch
2 bi-gaps
2 HV ch
2 bigaps = 96 strips = 6 febs
LVD channel
HV channel
LVA channel
RB = remote board
26 ch * 12 sect * 5 wheels = 1560 LV
17 ch * 12 sect * 5 wheels = 1020 HV
4 remote boards * 12 sect * 5 wheels = 240 RB
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22. Pierluigi Paolucci - I.N.F.N. Naples
HV – LV numbers
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The barrel system consists of:
wheel 1 2 3 4 5
TOT
chambers
156
780
gaps
408
2040
hv ch.
204
1020
front-end
936
4680
lv ch.
312
1560
having been chosen:
2 gaps per HV channel and 6 FEBs per LV channel
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23. Barrel cables routing LV HV 26 LV ch/cable + 17 HV ch/cable per sector
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26 LV ch/cable + 17 HV ch/cable per sector
LV-HV 1 2
LV-HV
LV-HV 3 4
LV-HV
Sector -4
Sector -5
LV-HV
Muon racks
2 RPC HV-LV crates
Sector –6 LV HV
26 LV ch/cable
26 LV
17 HV
LV-HV 5 6
LV-HV 7 8
Elect. house
17 HV
26 LV
17 HV ch/cable LV
48 remote boards/wheel  240 Remote Board
1 crates/rack  8 crates/wheel  40 crates
26 ch * 12 sect * 5 wheels = 1560 LV
17 ch * 12 sect * 5 wheels = 1020 HV HV

24. Pierluigi Paolucci - I.N.F.N. Naples
HV cable
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The HV cable has been chosen and approved
Suitable to sustain up to 15 kV
Cable characteristics:
According CERN safety instruction IS 23
Single conductor- = 0.16 mm
Conductor 20°C = 147 /Km
Core- = 3 mm
Screen wire-=0.2 mm (for 10 conductors)
Overall diameter = 8.4 mm (for 3 conductors)
Price: €/Km (for 10 Km and 3 conductors cable)
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25. Pierluigi Paolucci - I.N.F.N. Naples
HV connectors I
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The HV connector has been chosen and approved
Possibility to stack it up
Electrical characteristics:
Operating voltage: 15 kV
Testing conditions: 20 kV
2 high voltage pins to supply –12 kV
1 pin for signal return
insulating material
Polietilene HDPE (Eraclene Polimeri Europa (57%)
Masterbatch (GPO1246 Viba) (43%) (Conforming to TIS Rules)
Metal cover connected to external chamber aluminum frame
ZAMA (UNI 3717 G-Zn A14 Cu1)
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26. Pierluigi Paolucci - I.N.F.N. Naples
HV connectors II
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By CPE (
Price: 3 CHF/contact/ pieces
Schedule:
The connector has passed CERN tests for chemical analysis
Made electrical test performance (before and after radiation exposure)
We are waiting for the final quotation before final order
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27. Pierluigi Paolucci - I.N.F.N. Naples
Cost estimation
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The
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28. Pierluigi Paolucci - I.N.F.N. Naples
Schedule
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The
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29. Pierluigi Paolucci - I.N.F.N. Naples
Summary
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The SASY2000 project, developed by the CAEN-INFN for the LHC experiment will be intensively test in high magnetic field at CERN, high radiation flux at Louvain and for long term in Naples.
The total number of HV ch. is: 1020
The total number of LV ch. is: 1560
The total number of HV-LV remote board is: 240
The HV-LV crate will be designed and built in Naples
The prototype will be under test until Sept 2002
Magnetic Field test: MAY 2002 (results are under study)
High Radiation test: MAY 2002 – JULY 2002
High Stress test: SEPT-OCT 2002
An alternative project for the LV system is under study.
The HV-LV project will be discussed at INFN in Sept 2002.
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