1. RPC Detector Control System
Pierluigi Paolucci - I.N.F.N. of Naples

2. Pigi Paolucci, I.N.F.N. of Naples
DCS numbers
I.N.F.N. Naples
BARREL + ENDCAP
HV system  ch. = 143 boards
LV system  ch. = 130 boards
Temperature  ? ch. = ? boards
Front End  FEBs
Gas
Cooling
Rack, crate
Ventilation
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

3. Pigi Paolucci, I.N.F.N. of Naples
DCS status overview I
I.N.F.N. Naples
HV channels (80 boards) placed in the 12 crates;
Tender is started in December 03 and will finish in this days (May 04)
II Prototype in July 04;
Prototype Test in Naples/ISR/Test Beam from Sept 04;
20% of the system in Dec 04;
Board test at CERN from Jan 05;
Full system in Sept 05;
Installation and commissioning 06.
LV channels (60 boards) placed in the 20 crates;
CMS found a common solution;
A3009 board with 12 ch. 2-8 V - 9A;
Tender at CERN 04;
Full system available in Dec 05;
news
Control Room
news
Detector
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

4. Pigi Paolucci, I.N.F.N. of Naples
DCS status overview II
I.N.F.N. Naples
Temperature probes  readout 10 ADC boards;
100 probes installed (on the chambers); 250 probes ready at the assembling sites;
An ADC/DAC board with 128 ch. Is under design for ATLAS & CMS by the CAEN company;
The board will be integrate in the EASY crate;
Prototype and test in the 2004;
Full production in the 2005.
Front-end Front End Boards 800 Link boards in 60 crates
Control/monitor width, threshold and temperature
monitor the RPC/FEB performances (occupancy, rate, noise….)
Racks and crates, gas, cooling and ventilation: will be developed using a common solution/tools for the CMS sub-detectors.
news
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

5. Pigi Paolucci, I.N.F.N. of Naples
DCS connection Schema
I.N.F.N. Naples
Control
Room
SY1527
LV + Temp
20 Bus lines HV
12 Bus lines
splitter
HV crates
LV + Temp
LB crate
Detector
LV + Temp
LB crate
300 Optical 1.6 Gbit/s
LV + Temp
LB crate
LV + Temp
LB crate
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

6. Temperature sensor
I.N.F.N. Naples
Our goal is to measure the iron gap temperature with a precision of 1oC in order to:
compensate the HV working point in case of a large gradient of the temperature e/o atmospheric pressure;
study the RPC aging and the current/noise behaviors taking into account this crucial parameter;
Switch off the chamber/sector/wheel in case of “high” temperature ( > 26 oC).
We have decided to use
the Analog Device
AD592BN transducer,
after having tested
different sensors.
AD592 temperature transducer
High Pre-calibrated Accuracy: 0.5oC +25oC
Excellent Linearity: 0.158C max (0oC to +70oC)
Wide Operating Temperature Range: –25oC to +105oC
Single Supply Operation: +4 V to +30 V
Excellent Repeatability and Stability
High Level Output: 1 mA/K
Two Terminal Monolithic IC: Temperature In/Current Out
Minimal Self-Heating Errors
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

7. Pigi Paolucci, I.N.F.N. of Naples
Front End Board I
I.N.F.N. Naples
The front end electronic boards communicate with the Link Board through the I2C bus;
Each Slave LB receives data from up to 6 FEBs  96 strips;
Each Master LB is connected to not more than 2 SLB;
MLB transmits data to the control room via optical fiber;
Each LB crate house up to 8 LBs and has 1 Control Board (CCU);
The RPC continuous monitoring (noise rate, occupancy…) will have a refresh rate of 10 sec;
For each strip the events before and after windowing are counted during a defined period of time. That allows plotting of rates and efficiency;
There are two 32-bit counters for each group of 128 channels/strips;
The amount of data to be sent is 2*32*128 = 8 Kb/10s/LB/plot.
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

8. Pigi Paolucci, I.N.F.N. of Naples
Link Board Schema
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples

9. Front End Board II
I.N.F.N. Naples
Additionally for the orbit synchronization there are ca bit counters (1 for each bunch crossing) producing ca. 128 Kb of data / plot. But these probably can be read less often.
The theoretical throughput of a CCU chain (up to 27 CBs) is 4 MB/s.
The theoretical throughput of a LB box is 4 MB/s / 27 = 152 KB/s.
The theoretical throughput of a Link Board is 152 KB/s / 8 = 19 KB/s.
Required throughput for a continuous monitoring of one RPC is:
128 strips * 2 counters * 32 bits = 8 Kb/10s = 100 Bytes/s.
The I2C communication does not contribute significantly to the total CCU load.
The total bandwidth depends on the number of CB's in single CCU chain (serviced by a single FEC).
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Pigi Paolucci, I.N.F.N. of Naples

10. First examples Clusters Size Distribution
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Pigi Paolucci, I.N.F.N. of Naples

11. Pigi Paolucci, I.N.F.N. of Naples
Conclusions
I.N.F.N. Naples
The HV tender is finishing in these days, the prototype will be ready in July 04. The production will finish in September 05.
The CMS LV project is almost ready. The tender will start in the first months of the The CAEN has a LV board designed for RPC.
100 out of 300 temperature sensors (AD592BN) have been installed on the chambers and tested at the ISR.
The Link Board test-beam project is going on. New check/results during the next test beam (2004).
The histograms and snapshots work well and have proved their usefulness in testing the performance of chambers.
A JCOP/PVSS course will be held in Naples in June There are a lot of requests from Italian group.
A full time student from Naples begin to work on the RPC DCS in May 04.
news
news
27/11/2018
Pigi Paolucci, I.N.F.N. of Naples