1. Introduction to PACMAN Work Package 2 Magnetic Measurements
Marco Buzio, Stephan Russenschuck (CERN, TE-MSC)

2. Overview of WP 2 Main goals:
ESR
Subject
Secondment
University
CERN
Supervisor
2.1
Stretched wire systems for the magnetic measurements of small-aperture magnets
SigmaPhi, FR (3M) Metrolab, CH (3M)
UniSannio (IT)
S. Russenschuck
2.2
Printed Circuit Board technology for small-diameter field probes
SigmaPhi, FR (3M) ELTOS, IT (3M)
M. Buzio
Main goals:
develop instruments and methods to measure the position of the magnetic axis of quadrupole magnets within an absolute uncertainty of 10~20 m and a resolution of the order of nanometers
develop instruments and methods to measure the field strength and quality (polarity, direction, harmonic content) of multipole magnets inside gaps as small as 4 mm
Additional constraints:
integration with other equipment on the test stand
scalability to very large industrial production (issues: automation, robustness, cost, speed)

3. ESR 2.1: Stretched wire systems for the magnetic measurements of small-aperture magnets

4. Potentially able to provide Bn(s) profiles
ESR 2.1: Stretched wire systems for the magnetic measurements of small-aperture magnets
Status:
Well-established single translating wire technology for standard measurements of multipole magnets with 20 mm: absolute metrological reference for integrated field strength, direction and magnetic axis of LHC MB/MQ
Ongoing R&D on oscillating wire technology for magnetic center localization and integrated field quality (harmonics)
Potentially able to provide Bn(s) profiles
1 prototype system available, already used on solenoids, CLIC and Linac4 quads
main drawback: slow (Fourier analysis at each (x,y) position  long acquisition needed for good resolution in frequency)  measurement of steady-state fields only
the only instrument that looks scalable down to 4 mm

5. ESR 2.1: Stretched wire systems for the magnetic measurement of small-aperture magnets
Goal: development of an oscillating wire system integrated on the test stand and compatible with mechanical and RF alignment methods
R&D directions:
design and qualification of sensors and components: wire material, optocouplers, inductive sensors, linear translation stages, electronic acquisition systems
metrological system characterization: non-linear effects, non-ideal wire geometry, magnetic forces on the wire, influence of ambient fields and vibrations, influence of wire sag and tension, influence and reconstruction of longitudinal field profile, resistive and inductive effects on wire voltage, absolute and relative calibration …
axis transfer: the wire is located, on average, on the magnetic axis  a survey (by optical or mechanical means) must relate the coordinates of the wire ends to the test stand reference system. Main metrological issue: identification and elimination of systematic and random errors (can we use the existing CMM ?)
electronic acquisition: advanced ADC and signal processing, lock-in functionality, automated fault detection, integration within existing equipment (Fast Digital Integrators, C++ Flexible Framework for Magnetic Measurements)

6. Prototype 7.8 mm rotating coil
ESR 2.2: Printed Circuit Board technology for small-diameter field probes
Prototype 7.8 mm rotating coil

7. Main advantages: fast, inherently accurate field harmonics
ESR 2.2: Printed Circuit Board technology for small-diameter field probes
Status:
Well-established rotating coil technology for the measurement of local and integral field strength, direction, axis and harmonics in multipole magnets with >20mm. Reference method for field quality.
 20 mm system developed for Linac4 and used for DBQ prototypes. Systematic errors e.g. 20 units of b3 due to poor coil geometry (solution using numerical coil bucking under test)
 8 mm protoype PCB coils developed for MQ protos. Poor mechanics  difficult calibration (ongoing effort)
Main advantages: fast, inherently accurate field harmonics

8. referencing of rotating axis for magnetic axis fiducialization
ESR 2.2: Printed Circuit Board technology for small-diameter field probes
Goal: development of a rotating coil system (single scanning coil and/or coil train) integrated on the test stand and aimed mainly at field strength and quality series acceptance tests
R&D directions:
improvement of PCB coil head: track density, layer referencing and alignment, mechanical stiffness, alignment and stability of ball bearings, scaling above and below 8 mm
electronic acquisition systems: correction of side effects of high resistance load coils
metrological characterization: absolute and relative calibration/ cross calibration w.r.t. wires, impact of ambient conditions (mechanical and electrical noise, temperature) …
referencing of rotating axis for magnetic axis fiducialization
measurement of time-varying magnetic axis drift, vibrations, etc. in fixed-coil mode

9. Training events, workshops & conferences Lead Organising Institution
Network-wide training activities – workshops & conferences
Training events, workshops & conferences
Lead Organising Institution
ESR 2.1
ESR 2.2 1
AXEL : introduction to particle accelerators (10h)
CERN X 2
Basic principles of metrology and survey (2 days) 3
CLIC principles and technology challenges (4-6 hours) 4
Basic Labview training (5 days) NI
(X) 5
Radiation effects on electronics (4 days) 6
Electromagnetic compatibility (6.5 h) X  7
MATLAB (2 days) 8
CMM fundamentals and operating software Quindos (5 days)
Hexagon 9
Advanced course in FSI (2 days)
Etalon 10
MAGNE  X 11
ANSYS (4 days) 14
Dimensional metrology (10h) 15
USPAS course on vibrational aspects for accelerators (5 days) 16
Introduction to accelerator physics (2 weeks) 17
CST Microwave Studio (2 days) 18
NI RF module (5 days) 19
EMAG (2 days)

10. Training events, workshops & conferences
Network-wide training activities – workshops & conferences
Training events, workshops & conferences
Planned date
ESR 2.1
ESR 2.2 12
Workshop on Intellectual property and technology transfer
June 15 X 13
First, Second and Final PACMAN workshop (3 days each)
Feb.15, Sept.16, June 17 20
Conference in Optical metrology
May 2015, 2016 21
International Workshop on Accelerator Alignment (IWAA)
Oct. 2014, 2016
(X) 22
Biennal ISMA conference on Noise and Vibration Engineering 23
EUSPEN Yearly international conference and industrial exhibition
Oct. 2015, 2016 24
The International Magnetic Measurements Workshop (IMMW)
June 2015, 2016 25
International Conference in Magnet Technology (MT)
July 2014, 2016  X X  26
The International Workshop on Future Linear Colliders (LCWS)
Oct. 2014, 2015, 2016 27
The LINAC conference is devoted to linear accelerators all over the world.
Sept. 2014, 2015, 2016 28
The International Particle Accelerator Conference (IPAC) 29
The European Gender Summit, organized yearly by genSET.
Nov. 2014, 2015, 2016 30
IMEKO (International Measurement Confederation) 31
I2MTC (IEEE International Instrumentation and Measurement Conference)
May 2014, 2015, 2016

11. Network-wide training activities – workshops & conferences
Duration
Host / trainer
ESR 2.1
ESR 2.2
Safety awareness
1 hour
CERN X
Communication towards the general public
4 hours
Team building
1 day
Communication
program
Communicating effectively.
4 days
Personal awareness and impact.
3 days
Making presentations
Negotiating efficiently.
2 days
Management program
Managing by project
Project scheduling and costing
Quality management.
Risk management.
Entrepreneurship for researchers
French/English.
30 hours
(X)
Framework proposal writing

12. ELTOS, Arezzo, IT SEE P lequerre’s tALK WP2 PACMAN Partners
Design and manufacture of innovative multi-layer rigid PCBs for industrial, medical, communications, computing, defense, aerospace, automotive markets worldwide
Founded 1980, 100 employees of which 30% engineers, 12 M€/year turnover
Established as a successful commercial partner of CERN on prize-winning large-size PCBs for LHCb and unique fluxmeters for the MedAustron collaboration
Possible R&D topics for ESR 2.2: - tools, materials and techniques for search coils on PCBs - high density, high precision tracks for large fluxmeters - high precision multi-layer PCB alignment and stacking - mechanical improvement of rotating coil heads and fluxmeter assemblies - quality assurance, long term dimensional stability
SEE P lequerre’s tALK
Data and pictures courtesy of ELTOS

13. METROLAB, Geneve, CH WP2 PACMAN Partners
Unique NMR PT2025 teslameter used worldwide as the metrological reference for field strength calibration and ultra-precise field mapping
Leading provider of fluxmeters for mapping accelerator magnets…
… and a family of 3-axis Hall/fluxgate magnetometers for measurements in industrial, research, medical imaging and environmental applications
Founded in 1985, 10 employees of which 5 scientists/engineers, ~5MCHF turnover
Strategic partners of CERN in several technology transfer initiatives, from the forefathers of PT2025 to PDI and FDI digital integrators
Possible R&D topics for ESR Cross-calibration of wire systems with NMR/Hall probes - Integration of low-level, long-duration voltage signals - Characterization of next-generation NMR teslameters for real-time magnet control applications
Data and pictures courtesy of METROLAB

14. Sigma Phi, Vannes, FR WP2 PACMAN Partners
Leader in the design and manufacture of magnets , power converters and other components for industry, high energy physics and medical accelerators
Founded in 1981, 50 employees of which 22 scientists and engineers, … turnover
Extensive facilities for in-house magnetic testing
Possible R&D topics for ESR 2.1 and 2.2: - fine-tuning magnetic measurements to provide useful feedback to production - critical aspects of the use of stretched wire and rotating coil systems in industrial settings: robustness and user-friendliness of the control software, frequency of recalibration - practical measurement validation and magnet acceptance criteria
Data and pictures courtesy of SigmaPhi

15. Università del Sannio, Benevento, IT
WP2 PACMAN Partners
Università del Sannio, Benevento, IT
Multi-disciplinary academic pole serving a large territory in Campania and Basilicata
Established in 1998, 8000 students,
Very active international research and European collaboration center (PTB, NIST, INRIM, SEMETRO, IMEKO, IEEE IM)
Long-standing R&D collaboration with CERN on magnetic measurements, electric current measurements and other electronic instrumentation: Master- and PhD- level graduates - Development of key infrastructure such as the C++ Flexible Framework for Magnetic Measurements and the Fast Digital Integrators - Essential contributions to the development of rotating coil systems and stretched wire techniques
Data and pictures courtesy of Universita’ del Sannio