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High-quality measurements of pulses are nowadays widely used in fields such as radars, pulsed lasers, electromagnetic pulse generators, and particle accelerators. Whilst literature is mainly focused on fast systems for nanosecond regime with relaxed metrological requirements, in this paper, the high-performance measurement of slower pulses in microsecond regime is faced. In particular, the experimental proof demonstration for a 15 MS/s, ±25 ppm repeatable acquisition system to characterize the flat-top of 3 µs rise-time trapezoidal pulses is given. The system exploits a 5 MHz bandwidth circuit for analogue signal processing based on the concept of flat-top removal. The requirements, as well as the conceptual and physical designs are illustrated. Simulation results aimed at assessing the circuit performance are also presented. Finally, an experimental case study on the characterization of a pulsed power supply for the klystrons modulators of the Compact Linear Collider (CLIC) under study at CERN is reported. In particular, the metrological characterization of the prototype in terms of bandwidth, repeatability, and linearity is presented.

Magnets are at the core of both circular and linear accelerators. The main function of a magnet is to guide the charged particle beam by virtue of the Lorentz force, given by the following expression: F = q v × B, (8.1) where q is the electrical charge of the particle, v its velocity, and B the magnetic field induction. The trajectory of a particle in the field depends hence on the particle Coordinated by F. Bordry

Abstract-The design, evaluation, and commissioning of a highvoltage reference test bed for pulsed applications to be used in the precision testing of high-voltage dividers is described. The test bed is composed of a pulsed power supply, a reference divider based on compressed-gas capacitor technology, and an acquisition system that makes use of the fast measurement capabilities of the HP3458 digital voltmeter. The results of the evaluation of the reference system are presented.Index Terms-Capacitance measurement, high-voltage techniques, linear particle accelerator, large Hadron Collider, measurement uncertainty, pulse measurement, pulsed power supplies, voltage measurement.

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The initial results from integration testing of the LHC magnet power converters revealed problems of lowfrequency noise, settling time, drift with time and temperature, thermal management and EMC. These problems originated in the use of DSP, the A/D converter (ADC), the DCCT and their respective environments. This paper reports the methods used to improve the performance through hardware and software modifications and the results achieved. Large Hadron Collider Project DEVELOPMENTS IN HIGH-PRECISION ASPECTS OF POWER CONVERTER CONTROL FOR LHCM. Bastos, A. Cantone, G. Fernqvist, Q. King, CERN, Geneva, Switzerland AbstractThe initial results from integration testing of the LHC magnet power converters revealed problems of lowfrequency noise, settling time, drift with time and temperature, thermal management and EMC. These problems originated in the use of DSP, the A/D converter (ADC), the DCCT and their respective environments. This paper reports the methods used to improve the performance through hardware and software modifications and the results achieved.

The design and evaluation of a high precision pulsed current source for the dynamic characterisation of shunts and burden resistors is described. This generator uses a set of current mirrors based on ratio resistor networks to amplify a 10 mA DC current reference and to subsequently generate a pulse by means of a complementary pulse approach. Simulations and preliminary results of the complementary pulse circuit will be presented.