Claudio Rivetta

A Design Report of the Baseline for PEP-X: an Ultra-Low Emittance Storage Ring

Over the past year, we have worked out a baseline design for PEP-X, as an ultra-low emittance storage ring that could reside in the existing 2.2-km PEPII tunnel. The design features a hybrid lattice with double bend achromat (DBA) cells in two arcs and theoretical minimum emittance (TME) cells in the remaining four arcs. Damping wigglers are used to reduce the horizontal emittance to 86 pm-rad at zero current for a 4.5 GeV electron beam. At a design current of 1.5 A, the horizontal emittance increases, due to intrabeam scattering, to 164 pm-rad when the vertical emittance is maintained at a diffraction limited 8 pm-rad. The baseline design will produce photon beams achieving a brightness of 10{sup 22} (ph/s/mm{sup 2}/mrad{sup 2}/0.1% BW) at 10 keV in a 3.5-m conventional planar undulator. Our study shows that an optimized lattice has adequate dynamic aperture, while accommodating a conventional off-axis injection system. In this report, we present the results of study, including the lattice properties, nonlinear dynamics, intra-beam scattering and Touschek lifetime, RF system, and collective instabilities. Finally, we discuss the possibility of partial lasing at soft X-ray wavelengths using a long undulator in a straight section.

The “Smart Dim Fuse”: A new approach to load control as a distributed energy resource

Aggregation of behind-the-meter distributed energy resources holds promise to provide valuable services to the grid, enabling greater penetration of intermittent renewable energy sources. We propose the Smart Dim Fuse system as an approach to utilize loads for aggregation services. The Smart Dim Fuse, installed on individual circuits at the breaker panel, enables load power control without service interruption via direct AC to AC voltage modulation, while reporting load measurement, identification, and resource a vailability forecasting to the aggregator. Using data from 131 homes, we evaluate the aggregate resource availability, and demonstrate a proof-of-concept prototype of the power electronics needed for this functionality.

Complex-coefficient systems in control

Complex-valued dynamics can be used for modeling rotationally invariant two-input two-output systems and bandpass systems when they are considered in the baseband. In a few instances, control design has been done in the complex domain, which facilitated analysis and synthesis. While previous work has been application specific, we will discuss more generally how complex valued dynamics arise, basic properties of these systems, revisit some classic control theoretic results in the complex setting, and discuss two novel examples of control design in the complex domain — accelerator cavity field control and feedback linearization of RF amplifiers.

Control of step-down DC-DC power converter with LCL output filter feeding a constant power load

This paper proposes a control strategy for a step-down Buck power converter with LCL output filter feeding a constant power load. The control strategy uses exact feedback linearization, including the power estimation of the load. This allows to obtain fast response when the power demanded changes between different values. The power estimate is obtained by using a non-linear reduced-order observer with linear error dynamics. Hence, the control strategy uses a reduced number of sensors, increasing reliability and reducing the cost of the system. The system performance obtained with the proposed control strategy is tested through numerical simulations.

EMC Planning for High-Energy Physics Experiments

During the last years, the large hadron collider (LHC), the most powerful particle accelerator in the world, has been running at CERN in Geneva, Switzerland. It includes four large high-energy experiments and the compact muon solenoid (CMS) is one of them. The electronic read-out for the CMS experiment is designed to process signals in the range of

MODELLING AND STUDIES FOR A WIDEBAND FEEDBACK SYSTEM FOR MITIGATION OF TRANSVERSE SINGLE BUNCH INSTABILITIES

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First Results and Analysis of the Performance of a 4 GS/s Intra-Bunch Vertical Feedback System at the SPS

A-mA and digitize them synchronously at 40 MHz. Parts of these electronic systems are located inside of a uniform magnetic field of 4 T and operate under particle radiation. These characteristics have forced us to analyze, propose, and conduct electromagnetic compatibility (EMC) tests on the electronic equipment before integrating it into the detector. This paper presents the description and analysis of the first EMC plan and tests that were applied to a high-energy physics experiment before the installation and commissioning of the electronics system.