ICALEPCS2013 - List of Authors (Godlewski, J.)

Paper

Title

Page

The Control System for the CO2 Cooling Plants for Physics Experiments

370

L. Zwalinski, J. Daguin, J. Godlewski, J. Noite, M. Ostrega, S. Pavis, P. Petagna, P. Tropea, B. Verlaat
CERN, Geneva, Switzerland
B. Verlaat
NIKHEF, Amsterdam, The Netherlands

CO2 cooling has become interesting technology for current and future tracking particle detectors. A key advantage of using CO2 as refrigerant is the high heat transfer capabilities allowing a significant material budget saving, which is a critical element in state of the art detector technologies. Several CO2 cooling stations, with cooling power ranging from 100W to several kW, have been developed at CERN to support detector testing for future LHC detector upgrades. Currently, two CO2 cooling plants for the ATLAS Pixel Insertable B-Layer and the Phase I Upgrade CMS Pixel detector are under construction. This paper describes the control system design and implementation using the UNICOS framework for the PLCs and SCADA. The control philosophy, safety and interlocking standard, user interfaces and additional features are presented. CO2 cooling is characterized by high operation stability and accurate evaporation temperature control over large distances. Implemented split range PID controllers with dynamically calculated limiters, multi-level interlocking and new software tools like CO2 online p-H diagram, jointly enable the cooling to fulfill the key requirements of reliable system.

Poster MOPPC110 [2.385 MB]

TUPPC038

Simultaneous On-line Ultrasonic Flowmetery and Binary Gas Mixture Analysis for the ATLAS Silicon Tracker Cooling Control System

642

M. Doubek, V. Vacek, M. Vitek
Czech Technical University in Prague, Faculty of Mechanical Engineering, Prague, Czech Republic
R.L. Bates, A. Bitadze
University of Glasgow, Glasgow, Scotland, United Kingdom
M. Battistin, S. Berry, J. Berthoud, P. Bonneau, J. Botelho-Direito, G. Bozza, O. Crespo-Lopez, E. Da Riva, B. Di Girolamo, G. Favre, J. Godlewski, D. Lombard, L. Zwalinski
CERN, Geneva, Switzerland
N. Bousson, G.D. Hallewell, M. Mathieu, A. Rozanov
CPPM, Marseille, France
G. Boyd
University of Oklahoma, Norman, Oklahoma, USA
C. Degeorge
Indiana University, Bloomington, Indiana, USA
C. Deterre
DESY, Hamburg, Germany
S. Katunin
PNPI, Gatchina, Leningrad District, Russia
S. McMahon
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
K. Nagai
University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan
C. Rossi
Università degli Studi di Genova, Genova, Italy

We describe a combined ultrasonic instrument for continuous gas flow measurement and simultaneous real-time binary gas mixture analysis. The analysis algorithm compares real time measurements with a stored data base of sound velocity vs. gas composition. The instrument was developed for the ATLAS silicon tracker evaporative cooling system where C3F8 refrigerant may be replaced by a blend with 25% C2F6, allowing a lower evaporation temperature as the LHC luminosity increases. The instrument has been developed in two geometries. A version with an axial sound path has demonstrated a 1 % Full Scale precision for flows up to 230 l/min. A resolution of 0.3% is seen in C3F8/C2F6 molar mixtures, and a sensitivity of better than 0.005% to traces of C3F8 in nitrogen, during a 1 year continuous study in a system with sequenced multi-stream sampling. A high flow version has demonstrated a resolution of 1.9 % Full Scale for flows up to 7500 l/min. The instrument can provide rapid feedback in control systems operating with refrigerants or binary gas mixtures in detector applications. Other uses include anesthesia, analysis of hydrocarbons and vapor mixtures for semiconductor manufacture.
* Comm. author: martin.doubek@cern.ch
Refs
R. Bates et al. Combined ultrasonic flow meter & binary vapour analyzer for ATLAS 2013 JINST 8 C01002

Poster TUPPC038 [1.834 MB]

Paper	Title	Page
MOPPC110	The Control System for the CO2 Cooling Plants for Physics Experiments	370
	L. Zwalinski, J. Daguin, J. Godlewski, J. Noite, M. Ostrega, S. Pavis, P. Petagna, P. Tropea, B. Verlaat CERN, Geneva, Switzerland B. Verlaat NIKHEF, Amsterdam, The Netherlands
	CO2 cooling has become interesting technology for current and future tracking particle detectors. A key advantage of using CO2 as refrigerant is the high heat transfer capabilities allowing a significant material budget saving, which is a critical element in state of the art detector technologies. Several CO2 cooling stations, with cooling power ranging from 100W to several kW, have been developed at CERN to support detector testing for future LHC detector upgrades. Currently, two CO2 cooling plants for the ATLAS Pixel Insertable B-Layer and the Phase I Upgrade CMS Pixel detector are under construction. This paper describes the control system design and implementation using the UNICOS framework for the PLCs and SCADA. The control philosophy, safety and interlocking standard, user interfaces and additional features are presented. CO2 cooling is characterized by high operation stability and accurate evaporation temperature control over large distances. Implemented split range PID controllers with dynamically calculated limiters, multi-level interlocking and new software tools like CO2 online p-H diagram, jointly enable the cooling to fulfill the key requirements of reliable system.
	Poster MOPPC110 [2.385 MB]

TUPPC038	Simultaneous On-line Ultrasonic Flowmetery and Binary Gas Mixture Analysis for the ATLAS Silicon Tracker Cooling Control System	642
	M. Doubek, V. Vacek, M. Vitek Czech Technical University in Prague, Faculty of Mechanical Engineering, Prague, Czech Republic R.L. Bates, A. Bitadze University of Glasgow, Glasgow, Scotland, United Kingdom M. Battistin, S. Berry, J. Berthoud, P. Bonneau, J. Botelho-Direito, G. Bozza, O. Crespo-Lopez, E. Da Riva, B. Di Girolamo, G. Favre, J. Godlewski, D. Lombard, L. Zwalinski CERN, Geneva, Switzerland N. Bousson, G.D. Hallewell, M. Mathieu, A. Rozanov CPPM, Marseille, France G. Boyd University of Oklahoma, Norman, Oklahoma, USA C. Degeorge Indiana University, Bloomington, Indiana, USA C. Deterre DESY, Hamburg, Germany S. Katunin PNPI, Gatchina, Leningrad District, Russia S. McMahon STFC/RAL, Chilton, Didcot, Oxon, United Kingdom K. Nagai University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan C. Rossi Università degli Studi di Genova, Genova, Italy
	We describe a combined ultrasonic instrument for continuous gas flow measurement and simultaneous real-time binary gas mixture analysis. The analysis algorithm compares real time measurements with a stored data base of sound velocity vs. gas composition. The instrument was developed for the ATLAS silicon tracker evaporative cooling system where C3F8 refrigerant may be replaced by a blend with 25% C2F6, allowing a lower evaporation temperature as the LHC luminosity increases. The instrument has been developed in two geometries. A version with an axial sound path has demonstrated a 1 % Full Scale precision for flows up to 230 l/min. A resolution of 0.3% is seen in C3F8/C2F6 molar mixtures, and a sensitivity of better than 0.005% to traces of C3F8 in nitrogen, during a 1 year continuous study in a system with sequenced multi-stream sampling. A high flow version has demonstrated a resolution of 1.9 % Full Scale for flows up to 7500 l/min. The instrument can provide rapid feedback in control systems operating with refrigerants or binary gas mixtures in detector applications. Other uses include anesthesia, analysis of hydrocarbons and vapor mixtures for semiconductor manufacture. * Comm. author: martin.doubek@cern.ch Refs R. Bates et al. Combined ultrasonic flow meter & binary vapour analyzer for ATLAS 2013 JINST 8 C01002
	Poster TUPPC038 [1.834 MB]