engHenrichsen, K NMagnetic Field Measurements in Beam Guiding MagnetsAccelerators and Storage RingsCERN-LHC-98-008-MMSElectromagnets used as beam guiding elements in particle accelerators and colliders require very tight tole-rances on their magnetic fields and on their alignment along the particle path. This article describes the methods and equipment used for magnetic measurements in beam transport magnets. Descriptions are given of magnetic resonance techniques, various induction coil methods, Hall generator measurements, the fluxgate magnetometer as well as the recently developed method of beam based alignment. References of historical nature as well as citations of recent work are given. The present commercial availability of the different sensors and asso-ciated equipment is indicated. Finally we shall try to analyze possible future needs for developments in those fields.1998-10-26http://cds.cern.ch/record/372933http://cds.cern.ch/record/372933oai:cds.cern.ch:372933 engDahlerup-Petersen, KHalvarsson, BjornValbuena, RA 20 kA Test Bench for High-Precision Current MeasurementsAccelerators and Storage RingsLHC-Project-Report-270CERN-LHC-Project-Report-270The d.c. currents in the LHC dipole and quadrupole chains will require settings and adjustments with a precision of a few ppm. For an ultimate current level of 13 kA this represents an unprecedented accuracy. Compared to the requirements of previous accelerators at CERN, such as the LEP, this is a factor of ten better in accuracy at more than twice the current. State-of-the-art, zero-flux current transducers from Industry will be used for the precision measurements. As no existing laboratory would be capable of performing the calibrations of these transducers to the required precision, a major upgrading of the current Standards laboratory at CERN was decided. The paper describes the various phases of the project, from field calculations and design to construction and final commissioning of this unique test bench. The highly automated facility allows determination of off-sets, linearity and drift of transducers up to 20 kA but provides equally the means to study the sensitivity of the transducers to external stray fields as generated by currents in adjacent busbars.1999-02-09http://cds.cern.ch/record/379596http://cds.cern.ch/record/379596oai:cds.cern.ch:379596