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

2. CMS Experiment Control
I.N.F.N. Naples
Run Controls (RCS):
Configure and operate all local/global data taking sessions, Monitor and protect the measurements and the data flow
Based on the CMS online software framework (XDAQ – RCS) ad commercial products (DBs, SOAP, XML.....)
Detector Controls (DCS):
Setup and monitor the
detectors and the environment
Monitor and protect the apparatus equipment
Based on industry standards (PLC, field buses, PVSS and JCOP tools)

3. Pigi Paolucci, I.N.F.N. of Naples
CERN JCOP project
I.N.F.N. Naples
The CERN JCOP project has been designed to extend the PVSS II software package to the high energy physics experiment requirements.
Channel DB Manager  to define your hardware and software variables, define alarm, connect to hardware..
Panel Editor  to create/modify your panels
Alarm Handling  to generate/monitor alarms
Electronic Logbook  operation logbook (JCOP)
Archiving  to archive your data (JCOP)
State Machine (SMI)  JCOP tool
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

4. Pigi Paolucci, I.N.F.N. of Naples
Run Control & DCS
I.N.F.N. Naples
Central
DCS
Central
RCS
Interfaces already existing SOAP:
RCS – DCS : commands and status ownership
XDAQ – PVSS: data exchange
DCS services
Sub-Detector
Controller
Local DCS node
Local
XDAQ nodes
Plans to install and test RCS-DCS demonstrator in PC farm at CERN in 2004
Electronics
Setup,
etc.
Local
DCS tree for
HV, LV, P, T, etc.
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

5. Pigi Paolucci, I.N.F.N. of Naples
DCS demostrator
I.N.F.N. Naples
Global State
Central Control Panel
SubDetector States
Services States
SubDetector Control Panel
Detector Subsystems
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

6. DCS and Online Data Bases
I.N.F.N. Naples
DCS environmental data is stored in PVSS Archive or in external Oracle DB (not yet available in PVSS)
DCS configuration data can be stored/ retrieved from DCS Oracle DB:
Test new Framework interface to Configuration DB
Build interface between Framework and CMS Equipment Management DB:
Already done for Rack Control Application - CMS
General hardware configuration (HV, etc.) – JCOP Delivery
Integration issues with RMCS, XDAQ, DCS, Sub-detector DBs
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

7. Pigi Paolucci, I.N.F.N. of Naples
RPC DCS sub-systems
I.N.F.N. Naples
HV system  ch. = boards
LV system  ch. = boards
Temperature  ? ch. = 10 + ? boards
Front End  FEBs
Gas
Cooling
Rack, crate
Ventilation
CERN project
Barrel & Endcap
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

8. RPC DCS overview The RPC Detector Control System schema HV LV temp FEB
I.N.F.N. Naples
The RPC Detector Control System schema
RPC Barrel DCS HV LV
temp
FEB
Gas
Cooling
From other
DCS node
12 crates
80 boards
480 ch.
20 crates
60 boards
720 ch.
300 sensors
10 ADC
About
5000
FEBs
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

9. Pigi Paolucci, I.N.F.N. of Naples
DCS status overview I
I.N.F.N. Naples
HV channels (80 boards) placed in the 16 crates;
Tender is started in December 03 and is finished on May 04
Easy Prototype in July 04;
Prototype Test in Naples/ISR 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, 45 W, 5 boards/crate
Tender at CERN 04;
Full system available in Dec 05;
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

10. 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.
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

11. Pigi Paolucci, I.N.F.N. of Naples
DCS connection Schema
I.N.F.N. Naples
Control
Room
SY1527
20 Bus lines
12 Bus lines
HV distrib
HV EASY
LV + Temp
LB crate
Detector
LV + Temp
LB crate
300 Optical 1.6 Gbit/s
LV + Temp
LB crate
LV + Temp
LB crate
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

12. 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.
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
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

13. 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 about 30 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.
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

14. 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).
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

15. First examples Clusters Size Distribution
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

16. Pigi Paolucci, I.N.F.N. of Naples
DCS Cost estimation
I.N.F.N. Naples
Temperature:
T Sensors  300 * 4 €  1.2 K€;
Chamber cable  0.6 Km * 0.5 €/m  0.3 K €;
ADC cable  8 Km * 0.5 €/m  4.0 K €;
ADC cable inst  8 Km * 3 €/m  24 K€;
Cham Connect.  300 * 0.4 €  0.12 K €;
ADC Connect.  600 * 0.4 €  0.24 K €;
ADC boards  10 * 2000 €  20 K€;
FEB – I2C:
I2C cable  6 Km * 5 €/m  30 K€;
I2C connector  780 * 2 * 0.4€  0.7 K€;
I2C cable inst.  6 Km * 3 €/m  18 K€;
~ 50 K €
~ 49 K €
Total of ~ 110 K€ (10 KE for infrastructure)
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples

17. Pigi Paolucci, I.N.F.N. of Naples
Conclusions
I.N.F.N. Naples
The HV tender is finished; a 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 a couple of months. 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 project is going on. Next steps during the 3 test beams (June-Endcap/July-Bari/October-Barrel). The histograms and snapshots work well and have proved their usefulness in testing the performance of chambers.
A full time student from Naples is working on the RPC DCS and we will have a first complete prototype (HV-LV-Temp) at the end of the 2004.
There is an extra cost of about 50 KEuro due to the cost of the cable installation.
06/04/2019
Pigi Paolucci, I.N.F.N. of Naples