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CATHI Marie Curie Initial Training Network C ryogenics, A ccelerators and T argets at H IE- I SOLDE. Martino Colciago (EN-STI-ECE WP 6 ESR 12 )* Mid Term Review Meeting, 26 September 2012. Outline. Background Starting activities Main Topic Experience in the partner company - PowerPoint PPT Presentation
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Mid Term Review Meeting, 26 September 2012 M. COLCIAGO1
* The research project has been supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Programme under contract number (PITN-GA-2010-264330-CATHI)
CATHIMarie Curie Initial Training Network
Cryogenics, Accelerators and Targets at HIE-ISOLDE
Martino Colciago (EN-STI-ECEWP 6 ESR 12 )*
Mid Term Review Meeting, 26 September 2012
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO2
Outline Background Starting activities Main Topic Experience in the partner company List of trainings attended Future steps
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO3
Background Master degree in Automation Engineering at
Politecnico di Milano
Siberg srl: systems integration and automation systems
Fellow at Universita’ di Brescia (spin off GEXCEL )
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO4
Starting activities Starting date 1° August 2011 Work on position sensors calibration using LabVIEW:
– Eddy current sensor– ironless LVDT prototype sensor – LVDT Test bench software upgrade
Documented in internal reports
Bibliographic research and market investigation on position sensor based on interferometer principle to be used in hard radiation environments. Now at CERN for calibration test
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO5
Main topic: introduction 1/4Aim of the work: develop a new control system for the High Resolution Separator magnet (HRS) in order to achieve better performances for HIE-ISOLDE.
What is the HRS?
GPS= General Purpose Separator (70° magnet )
HRS= High Resolution Separator (90° and 60° magnet )
Isolde has two mass separators and they are used to separate the ions generated in the facility, according to their mass.
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO6
Main topic: system in use 2/4 Study of the current in use control system
Power supply: Bruker
B-MN70/480R
MAGNET
NMR: MetrolabPT2025 +2030 mux
DSC
0-480 Ampere
0.09-0.26 T 0.13-0.52 T
Work documented in a report.
BASIC IDEA: The magnetic field is measured with a Nuclear Magnetic Resonance (NMR) sensor. The control system compares the measured value with the desired one and it calculates the reference current to feed the magnet. – The control system is developed in C.– The algorithm uses a non-linear fitting of the magnetic field to find the
new reference current.
𝐵𝑟𝑒𝑓
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO7
New control under development using LabVIEW Real Time Control loop
– Use an industrial control: Proportional-integral-derivative control (PID) with anti-windup scheme
– Develop a Hysteresis model to support the NMR during blind time
– Matlab-Simulink is used as simulation software
Main topic: new control system 3/4
-
NMR
PID
Power supply MAGNET
Hysteresis
Switch
𝐵𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑
𝐵𝑠𝑖𝑚𝑢𝑙𝑎𝑡𝑒𝑑
𝐵𝑟𝑒𝑓 error 𝐼 𝑟𝑒𝑓 𝐵
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO8
These gains have to be tuned on the magnet to optimize the behaviour of the control system
Hysteresis model
Main topic: new control system 4/4
This activity is still on going
𝐾 𝑝𝑒 (𝑡 )+𝐾 𝑖∫𝑒 (𝑡 )𝑑𝑡+𝐾 𝑑𝑑𝑒(𝑡)𝑑𝑡
B
H
Simulated hysteresis
𝑢 (𝑡 )=𝐵𝑟𝑒𝑓 𝑎𝑛𝑑 𝑦 (𝑡 )=𝐵𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑𝑏𝑦 𝑁𝑀𝑅
PID control
𝐾 𝑝=𝑝𝑟𝑜𝑝𝑜𝑟𝑡𝑖𝑜𝑛𝑎𝑙𝑔𝑎𝑖𝑛 ;𝐾 𝑖=𝑖𝑛𝑡𝑒𝑔𝑟𝑎𝑙𝑔𝑎𝑖𝑛 ;𝐾 𝑑=𝑑𝑖𝑓𝑓𝑒𝑟𝑒𝑛𝑡𝑖𝑎𝑙 𝑔𝑎𝑖𝑛 .
Ḃ=𝐶𝜶|Ḣ|[ 𝑓 (𝐻 )−𝐵 ]+Ḣ 𝑔(𝐻 )
– Differential model: Coleman-Hodgdon – The model has 5 parameters which need to be tuned on real data
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO9
Partner company experience Sidea : deal with design, development and distribution of innovative
systems devoted to better performances in industry and research When and where: May to August, near Milano (Italy) LabVIEW Real Time
– Familiarization with LabVIEW Real Time environment– Development of some projects on the communications between
different devices !CHAOS (Control System based on Highly Abstracted Operating
Structure – but not a mess!)– New control system architecture proposed by Istituto Nazionale di Fisica
Nucleare for the SuperB accelerator at Cabibbo Lab (Under development)
– Aim of its design is to provide: redundancy of all its parts, intrinsic scalability and auto configuration
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO10
Attended training courses and workshops LabVIEW For Expert, 24-28 October 2011 C++ Part 2: Object-Oriented, 15-17 November 2011 LabVIEW Embedded Systems Application Design and Development
Training (LabVIEW RT custom course), 10-13 July 2012 Active Materials and actuators and Electronic and control for
piezomechanisms in mechatronics (Custom course), 11-13 October 2011
Training Sidea (Marie Curie partner company), 2 May-10 August 2012 ISOLDE Workshop, 5-7 December 2011 CERN Accelerator School on ION SOURCE (CAS), Senec 29 May-8 June
2012
Mid Term Review Meeting, 26 September 2012 M. COLCIAGO11
Future steps Trainings to be scheduled
– French course– Writing of professional documents course– Making presentation course
Working activity– Testing of the control system on a real magnet will be
needed to tune the hysteresis model and the PID parameters– A feed-forward hysteresis compensation scheme is under
study to further improve the magnet control– Study the problem of the magnetic field multipole error to
understand which is its relation with the feeding current and to develop a model of this relation
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