GGM Integration
Stefano Colafranceschi for the Frascati group
in collaboration with Giovanni Polese and Filip Thyssen
September 21, 2009
• The gas monitoring system is based on small RPC detectors in a
cosmic ray telescope whose working point (gain and efficiency) is
continuously monitored online. The gas monitoring system is designed
to provide determination of shifts in working point conditions.
• The GGM gaps are located in the SGX5 gas room, the charge
response to cosmic rays is monitored for three subsystems fluxed with
fresh, before purifiers, after purifiers gas mixes.
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GGM Layout
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GGM @SGX5 gas room
HUMIDIFIER
P,T,RH
SENSORS
VME
DAQ
RPC
GAPS
RPC
GAPS
IN CR TELESCOPE
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VERY COMPLEX GGM INTEGRATION LAYOUT
• Integration of GGM in DCS is complex
• New problems such as the readout of CAEN VME ADCs for gaps charges needed to be solved
for integration into xDAQ
• New drivers written by IT department for PICO T/p/RH sensors
• General plan of the DCS system:
• 3 computers in the .cms network take care of reading data variables from
• VME crate
• Environmental sensors
• CAEN power supply
XDAQ PC
cms-rpc-dcs-07
PVSS PC
cms-rpc-dcs-08
XDAQ
dst file
ROOT file (adc spectrum)
metadata
DCS PVSS
HV, I monitoring
Environment
Daq variables
ENVIRONMENTAL PC
cms-rpc-dcs-09
OPC SERVER
LABVIEW Picotech sensor
OPEN PROBLEM!!
CMS RPC Shifter
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Gas Gain Monitoring – Integration
INTERNET
[email protected]
cms network
cms-rpc-dcs-07
cms-rpc-dcs-08
XDAQ
cms-rpc-dcs-09
DCS PVSS
HV, I monitoring
Environment
Daq variables
dst file
ROOT file (adc spectrum)
metadata
cronjob and preparation
[email protected]
OPC SERVER
LABVIEW Picotech sensor
Open Problem!!
DROPBOX popcondev
ORCON DB
OMDS DB
DB offline for conditioning and calibration
streaming
ORCOFF DB
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GGM status
DCS Control Panels
to be fully integrated in the DCS RPC
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WHAT IS AVAILABLE TODAY WITH GGM IN THE
PRIVATE NETWORK
•
All Packages have been already tested in the public network
• DAQ system (XDAQ package)
•
•
•
Data transfer tested in the public network
•
•
•
•
•
HV, I monitoring (PVSS package)
P/T/TH gas sensors (LabView package)
From/to PVSS DCS to pico sensors through OPC
From/to PVSS DCS to trial DB CMS_GAS_GAIN_DATA@DEVDB10 (many problems found!)
From/to XDAQ to VME controller
Data transfer that cannot be tested (easily) in the public network
• FROM XDAQ to PVSS (PSX package), expecting help provided by experts
Data transfer that cannot be tested at all in the public network
•
From/to PVSS DCS to official CMS DB OMDS ), expecting help provided by experts
To test the beta version from the
cms private network:
• Once done last two steps;
login to lxplus.cern.ch, login to cmsusrX
rdesktop cms-rpc-dcs08 (DCS computer with the daq, HV, I monitoring, environment
monitoring)
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Open problem PSX server
cms-rpc-dcs-07
XDAQ
dst file
ROOT file (adc spectrum)
metadata
cms-rpc-dcs-08
DCS PVSS
HV, I monitoring
Environment
Daq variables
RPC PSX
“PSX server is supposed to send GGM
daq value (streamer, avalanche monitoring
and efficiency) from our XDAQ application
to PVSS through a SOAP protocol”
This server is needed to export the variables from the XDAQ application,
linux based, to DCS PVSS datapoints
1.
Outside cms network: any PSX server ready-to-use available, we have tried to setup it but
encountered many problems, and at the moment it doesn’t’ work.

Installed PVSS 3.7

Installed XDAQ WORKSUITE and PSX compiled package
Communication problem with the PSX server, during the setup something was wrong; the expert
L.Orsini suggested to use the central one.
2.
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Inside cms network the RPC PSX server is running, but encountered problems using it, it seems
we have to be fully integrated to have access to this server. We expect from Gomez-Reino
Garrido (the expert) the possibility to use this server.
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WHAT IS LEFT TO DO…
1. Open problem: Developing/Debugging integration protocols (PSX) in the .cms
network, what we have done:
1. Installed PVSS/XDAQ WORKSUITE and PSX to setup a private PSX server
2. Tried to use the central PSX server but no communication
3. Open problem discussed with F. Thyssen, G. Polese and R. Gomez-Reino
Garrido, we expect to use “easily” the central PSX server as soon as possible
2.
From/to DCS PVSS to official CMS database OMDS, thanks to G. Polese
3.
PVSS panel ready to be integrated in the main RPC shifter panel
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GGM References
1.
2.
3.
M.Abbrescia et al., Gas analysis and monitoring systems for the RPC detector of CMS at LHC,
LNF-06-34-P, LNF-04-25-P, Jan 2007. 9pp. Presented by S.Bianco at 2006 IEEE Nuclear
Science Symposium (NSS), Medical Imaging Conference (MIC) and 15th International Room
Temperature Semiconductor Detector Workshop, San Diego, California, 29 Oct - 4 Nov 2006.
e-Print: physics/0701014
L.BENUSSI et al. for the CMS RPC Collab., Sensitivity and environmental response of the CMS RPC gas
gain monitoring system. FRASCATI-PREPRINT-LNF--08--27(P), Dec2008. 8pp, e-Print: arXiv:0812.1710
[physics.ins-det], presented by L.Benussi at RPC07, Mumbai (India) 2008, Nucl. Instr. and Methods A
602 (2009), pp. 805-808.
L.BENUSSI et al. for the CMS RPC Collab., The CMS RPC gas gain monitoring system: an overview and
preliminary results. FRASCATI-PREPRINT-LNF-08-29(P), Dec 2008. 8pp. e-Print: arXiv:0812.1108
[physics.ins-det], presented by S.Colafranceschi at IEEE08, Dresden (Germany) 2008, published in JINST
4:P08006,2009.
22-07-2009
Stefano Bianco - CMS Frascati - Riunione referee
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SPARE
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Gas Gain Monitoring Performance
Avalanche Streamer
+-2%rms
Anode charge in avalanche-streamer
transition region monitors shifts in
working point. Large dependence
on gas mix components
Coherent effects cancel out due to system
redundancy. The two-gap ratio cancels out
Long-term environmental effects at the
+-2% level
0% SF6
Gaussian Fit
s = 1.7%
0.3% SF6
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Stefano Bianco - CMS Frascati - Riunione referee
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