Dr
Joseph DiMarco
(Fermi National Accelerator Laboratory)
Software
A new software system to test accelerator magnets has been developed at Fermilab
which employs a flexible component-based framework and allows for easy
reconfiguration and run-time modification. Various user interface, data
acquisition, analysis, and data persistence components can be configured to form
different measurement systems that are tailored to specific requirements. These can...
Alexander Temnykh
(Cornell University)
Measures
Interaction region of Cornell Electron Storage Ring (CESR) electron-positron
collider consists of two permanent and four superconducting quadrupole magnets.
During summer shutdown of 2003 all these magnets were realigned using vibrating
wire (VW) technique. In situ we measured magnetic center position of the magnets
analyzing standing waves excited by Lorentz forces on the wire...
Dr
Cristina Knapic
(Sincrotrone Trieste S.C.p.A.)
Devices
A permanent magnet Apple II type undulator was built at Elettra and a block sorting
process was done in order to minimize the effects of magnetic errors on
trajectories
and angles of the electron beam. To check and optimize these corrections, Stretched
Wire and Hall Plate measurements were performed. While the Stretched Wire system
provides a clean measurement of field integrals, the...
Dr
Alexander Temnykh
(Cornell University)
Measures
There will be described application of vibrating wire technique for the solenoid
magnet magnetic center finding. Theory, measurement setup as well as the
measurement result and achieved precision in comparison with theoretical prediction
will be presented.
Prof.
Juan Garcia Perez
(CERN)
Devices
Prof.
Leopoldo Angrisani
(University of Naples "Federico II")
Measures
At CERN, varying magnetic field measurements involve massive use of rotating coils
systems.
Standard procedure for estimating magnetic harmonic coefficients provides for the
fast Fourier transform (FFT) of the magnetic flux, acquired over one complete coil
turn and assumed to be stationary. The assumption certainly holds for magnets
measured along the loadline, i.e. through a powering...
Prof.
Pasquale Arpaia
(Università del Sannio)
Measures
Magnetism and magnetic materials constitute a fascinating and challenging subject
of investigation, playing a role in several branches of science and technology, as
well as in advanced accelerators for subnuclear basic research. The theoretical
description of ferromagnetic hysteresis and its rooting in the involved physical
mechanisms exhibit several fundamental interpretative aspects,...
Dr
Laurent Deniau
(CERN)
Software
Dr
Olivier Marcouillé
(Synchrotron SOLEIL)
Devices
One electromagnetic undulator (HU640)has been constructed to cover the VUV spectral
range of the SOLEIL synchrotron. HU640 has been especially designed to produce
polarized photons 5 eV -40 eV. It is composed of 16 periods of 640 mm generating up
to 0.1 T in both transverse direction Bx and Bz. The field is produce by three sets
of pure coils installed in a special arrangement. One set...
Mr
Yurii Levashov
(SLAC, Stanford)
Measures
Fiducialization of LCLS undulators is based on magnetic field measurements by Hall
probe. In this paper we discuss the fiducialization procedure, method and accuracy
of
coordinate transfer from center of the Hall probe sensitive area to the undulator
fiducial marks. Pointed magnets or "magnetic needles", proposed by Isaak
Vasserman[1], are used as an intermediate reference. A prototype...
Mr
Joseph DiMarco
(Fermi National Accelerator Laboratory)
Measures
Final alignment measurements of the LHC low-beta quadrupoles are performed at
Fermilab, both for magnets fabricated in-house, and for cold-masses supplied by KEK
and subsequently cryostatted at FNAL before shipment to CERN. This talk reviews the
various measurements performed during production and during room-temperature and
cryogenic magnet testing. Results of determining the 6-axis...
Pierre Schnizer
(Gesellschaft fuer Schwerionenforschung mbH (GSI))
Devices
2000 magnets of various types will be constructed for the FAIR project at
GSI. All these magnets have to be measured to ensure proper operation of the
machines. The small number of magnet in each series renders the construction
of an unique device for each inadequate. This talk will list the various
magent types needed for FAIR and discuss the selected magnetic...
Zack Wolf
(SLAC)
Devices
Our next large project at SLAC is an x-ray free electron laser. The magnetic
measurements for this project require building a new laboratory. The laboratory
under construction and a few other projects will be discussed.
Dr
Animesh Jain
(Brookhaven National Laboratory, USA)
Devices
Field quality in accelerator magnets is expressed in terms of harmonic coefficients
in a Fourier series, which are typically measured under DC conditions using a
rotating coil. The technique of rotating coils has also been extended to
measurements under AC conditions, but only for relatively slow ramps (well below
0.1
T/s). Currently, there is no well established technique for...
Mr
Joseph DiMarco
(Fermi National Accelerator Laboratory)
Devices
Many diverse types of magnetic devices requiring measurements under various
conditions are seen by the Fermilab Magnet Test Facility. This talk reviews some of
the more demanding and unusual measurements that we have recently had to work on,
and the techniques we have used to meet these requests. Among the measurements
discussed are curved magnets, pulsed magnet measurements at 20MA/s,...
Dr
Yoshihisa Iwashita
(Kyoto University)
Devices
Harmonic field measurement system with tangential coil is under fabrication. It
will be used to measure a
quadrupole magnet and a sextupole magnet. The system will be described.
Animesh Jain
(Brookhaven National Laboratory)
Summary & Guided discussion
Prof.
John Clarke
(University of California, Berkeley, and Lawrence Berkeley National Laboratory)
Special talks
The SQUID (Superconducting QUantum Interference Device) – a superconducting loop
containing two Josephson junctions – is an ultrasensitive detector of magnetic
flux. The principles, fabrication, and operation of the SQUID are outlined. With
the aid of a superconducting flux transformer, the SQUID achieves a magnetic field
noise of
10-15 T Hz-1/2; it can also be configured as a...
Dragana Popovic
(SENIS GmbH, Zug, Switzerland)
Measures
We shall present a novel 3-axes teslameter based on the first three-axes fully
integrated Hall probe [1].
The integrated Hall probe consists of a sensing part, analogue electronics and
digital synchronisation circuit. A horizontal Hall element measures the
perpendicular component; and two vertical Hall devices [2] measure the two in-plane
components of a magnetic field. The probe...
27.
Truffaldino + Smeraldina; A collection of tools for simulating magnetic field measurement probes
Pierre Schnizer
(Gesellschaft fuer Schwerionenforschung mbH (GSI))
Software
Various literature discribes formulae to calculate the sensitivity of coil
probes. These, however, are impractical for the casual user. Truffaldino is a
numerical tool to calculate such effects (as described in IMMW XII) and
Smeraldina a graphical user interface, which allows to use Truffaldino without
any programming background. This talk will concentrate on the...
Dr
Isaac Vasserman
(Argonne National Laboratory)
Devices
There have been upgrades to all subsystems of the insertion device magnetic
measurement system: the Hall probe, the moving coil, the stretched rotating coil,
and the stretched single-wire system. The noise levels and reproducibility of
measurements have been improved considerably so that no statistics are needed in
integral measurements. Only one measurement is enough and two scans...
Zack Wolf
(SLAC)
Measures
The LCLS quadrupoles must be fiducialized to 25 microns. This talk describes the
system we are building to perform the fiducialization.
Dr
Animesh Jain
(Brookhaven National Laboratory, USA)
Measures
BNL is building a pair of compact multi-function superconducting magnets to be
placed inside the BES experimental detector solenoid for a luminosity upgrade of
the
Electron Positron Collider (BEPC-II) at IHEP, Beijing. These magnets are produced
by a direct wind technology, originally developed at BNL for the HERA luminosity
upgrade at DESY. The main quadrupole layers of the...
