from tune feedback 6. Summary #12;Wolfram Fischer 3 Introduction � Tune feedback is only one component, instability changes � All these disadvantages would be overcome by feedback systems for all quantities � Need1 Tune Feedback from an Accelerator Physics / ...

... Sharing experience Diagnostic feedback - Group learning - Motivation for improving - Interactive coaching - Direction for ... Personality Assessment ...

The proposed B factory accelerator facilities will require active feedback systems to control multibunch instabilities. These feedback systems must operate in machines with thousands of circulating bunches and with short (2--4 ns) interbunch intervals. The functional requirements for transverse (betatron) and ...

The MUSE-4 experiment, dedicated to the Accelerator Driven System (ADS) development studies, was achieved in the MASURCA nuclear reactor facility from 2000 to 2004. An external neutron source was introduced in a lead buffer zone located at the centre of the reactor core in order to simulate the spallation source. This paper deals with the GENEPI ...

The operation of the Fermilab Main Ring and Tevatron rf systems for colliding beams physics is discussed. The changes in the rf feedback system required for the accelration of antiprotons, and the methods for achieving proper transfer of both protons and antiprotons are described. Data on acceleration and transfer efficiencies are ...

This report contains papers on the following topics: low- and medium-energy accelerators and rings; accelerator-instrumentation, controls, and feedback; injectors and ion sources; high-energy accelerators and colliders; synchrotron radiation sources; beam dynamics; free-electron lasers; pulsed power devices; rf, ...

The proposed next generation accelerator and synchrotron light facilities will require active feedback systems to control multi-bunch instabilities. These feedback systems must operate in machines with thousands of circulating bunches and with short (2--4 ns) interbunch intervals. The functional requirements for ...

A control method for the stable and equal operation of several electron accelerators connected in parallel to a single high-voltage source is described. The filament circuit of the electron-gun power supply of each electron accelerator has a filament current detecting resistance connected thereto. Each electron ...

Feedback systems are essential for stable operation of a linear collider, providing a cost-effective method for relaxing tight tolerances. In the Stanford Linear Collider (SLC), feedback controls beam parameters such as trajectory, energy, and intensity throughout the accelerator. A novel dithering optimization ...

DISTURBANCE FEEDBACK TECHNIQUES FOR HYDROFOIL CRAFT USING ACCELERATION MEASUREMENTS Sergey, and the overall controller explicitly exhibits an algebraic disturbance feedback loop. A simplified hydrofoil rejection, marine systems, ship control 1. INTRODUCTION In hydrofoil control, acceleration ...

The report discusses preliminary proof-of-concept research for using the Advanced Data Validation and Verification System (ADVVS), a new INEEL software package, to add validation and verification and multivariate feedback control to the operation of non-destructive analysis (NDA) equipment. The software is based on human cognition, the recognition of ...

The operation of the Fermilab Main Ring and Tevatron rf systems for colliding beams physics is discussed. The changes in the rf feedback system required for the accelration of antiprotons, and the methods for achieving proper transfer of both protons and ...

The development of beam-based digital feedback systems for the CEBAF accelerator has gone through several stages. As the accelerator moved from commissioning to operation for the nuclear physics program, the top priority was to stabilize the beam against slow energy and position drifts (<1 Hz). These slow drifts ...

1% amplitude and l{degree} phase. The feedback control system requires a phase-stable RF reference subsystem signal to correctly phase each cavity. Also, instead of a single klystron RF source for individual accelerating cavities, multiple klystrons will drive a string of resonantly coupled cavities, based on input from a single LLRF ...

A narrowband beam loading compensation system was installed for the Main Injector Accelerating Cavities. This feedback operates solely on the fundamental resonant mode of the cavity. This paper describes modifications to the high level Radio Frequency system required to make the system operational. These ...

... (AN). Descriptors : *MATHEMATICAL MODELS, *WAVE EQUATIONS ... FEEDBACK, CONVERGENCE, OPERATORS(MATHEMATICS), APPLIED ...

This report presents a review of magnet operating experiences for normal-conducting and superconducting magnets from fusion, particle accelerator, medical technology, and magnetohydrodynamics research areas. Safety relevant magnet operating experiences are presented to provide feedback on field performance of ...

In order to suppress longitudinal coupled-bunch oscillations which might limit the capabilities of PEP, the 18 GeV e/sup +/e/sup -/ storage ring at SLAC, a longitudinal feedback system is utilized. A frequency domain feedback system was chosen with the frequency spectrum of the stored beam being sampled close to a symmetry point in the ring where the ...

The RF system of the PEP-II collider uses two fast feedback loops around each klystron and set of cavities. These loops reduce the impedance of the fundamental mode of the accelerating cavities seen by the beam, and are necessary to reduce the growth rates of longitudinal modes within the RF system bandwidth. Operation of the ...

A cw klystron operating at 476 MHz has been developed jointly by SLAC and Varian Associates. The unique set of characteristics of this tube were strongly guided by requirements of the fast feedback necessary to prevent oscillations of the storage ring beams caused by the detuned accelerating cavity. This requires a combination of ...

Initially the SLC Damping Rings accomplished Robinson instability damping by operating the RF accelerating cavities slightly detuned. In order to be able to run the cavities tuned and achieve damping for Robinson instability and synchrotron oscillations at injection an active feedback system has been developed. This paper describes the ...

A fast feedback system based on concepts of modern control theory has been implemented in the CEBAF Control System to stabilize various machine parameters. The continuous wave operation of CEBAF requires that parameters such as beam energy and position are stabilized against fast fluctuations. The beam energy must be stabilized against fast gradient and ...

he VLT observatory operated by ESO is located on Cerro Paranal in Chile and consists of four identical 8-m telescopes and four 1.8-m VLTI Auxiliary telescopes (ATs). In order to further improve the tracking axes performance of telescopes regarding wind rejection, different control techniques have been evaluated. Ongoing investigation and studies show that by measuring the ...

Tune feedback was first implemented in RHIC in 2002, as a specialist activity. The transition of the tune feedback system to full operational status was impeded by dynamic range problems, as well as by overall loop instabilities driven by large coupling. The dynamic range problem was solved by the CERN development of the Direct Diode ...

For delicate operations conducted using surgical robot systems, surgeons need to receive information regarding the contact forces on the tips of surgical instruments. For the detection of this contact force, one of the authors previously proposed a new method, called the overcoat method, in which the instrument is supported by sensors positioned on the overcoat pipe. This ...

A modular programmable longitudinal feedback system has been developed as a component of the PEP-II R+D program. This system is based on a family of VME and VXI packaged signal processing functions which implement a general purpose digital feedback controller for accelerators with bunch spacings of 2 ns. A complete PEP-II prototype ...

Requirements for tune and chromaticity control in most superconducting hadron machines, and in particular the LHC, are stringent. In order to reach nominal operation, the LHC will almost certainly require feedback on both tune and chromaticity. Experience at RHIC has also shown that coupling control is crucial to successful tune ...

Early efforts to implement tune feedback during the acceleration ramp in RHIC were hampered by large betatron coupling, as well as the requirement for large dynamic range. Both problems have been addressed, the first by implementation of continuous measurement of coupling, and the second by the development of an improved analog front end. With these ...

Electron clouds impose limitations on current accelerators that may be more severe for future machines, unless adequate measures of mitigation are taken. Recently, it has been proposed to use feedback systems operating at high frequency (in the GHz range) to damp single-bunch transverse coherent oscillations that may otherwise be ...

Early efforts [1] to implement tune feedback during the acceleration ramp in RHIC were hampered by large betatron coupling, as well as the requirement for large dynamic range. Both problems have been addressed, the first by implementation of continuous measurement of coupling, and the second by the development of an improved analog front end. With these ...

The operation of a longitudinal multibunch damping system using digital signal processing (DSP) techniques is shown via measurements from the Lawrence Berkeley Laboratory (LBL) Advanced Light Source (ALS). The feedback system (developed for use by PEP-II, ALS, and DA{Phi}NE) uses a parallel array of signal processors to implement a bunch-by-bunch ...

The operation of a longitudinal multi-bunch damping system using digital signal processing techniques is shown via measurements from the LBL Advanced Light Source. The feedback system (developed for use by PEP-II, ALS and DA{Phi}NE) uses a parallel array of signal processors to implement a bunch by bunch feedback system for sampling ...

To date, the 120 GeV Fermilab Main Injector accelerator has accelerated a single batch of protons from the 8 GeV rapid-cycling Booster synchrotron for production of antiprotons for Run II. In the future, the Main Injector must accelerate 6 or more Booster batches simultaneously; the first will be extracted to the antiproton source, ...

This patent relates to an improved acceleration integrator and more particularly to apparatus of this nature which is gyrostabilized. The device may be used to sense the attainment by an airborne vehicle of a predetermined velocitv or distance along a given vector path. In its broad aspects, the acceleration integrator utilizes a magnetized ...

Accelerator Division Notification Message Archive Accelerator Operations One-liners Schedules Accelerator Division Operations weekly Run Coordinator Reports Early Bird Accelerator...

We present a possible design for a fast luminosity feedback for the SuperB Interaction Point (IP). The design is an extension of the fast luminosity feedback installed on the PEP-II accelerator. During the last two runs of PEP-II and BaBar (2007-2008), we had an improved luminosity feedback system that was able to ...

This patent describes a method for controlling supercharge pressure of a turbocharger. The method comprises the steps of: detecting an acceleration condition of an engine based on an operating condition of the engine; performing a feedback control of the supercharge pressure by using a capacity changing means for changing the exhaust ...

acceleration level) are typically measured during the science missions to characterize ... acceleration measurement instrument. Measuring the acceleration ...

A system and method are disclosed for eliminating swing motions in gantry-style cranes while subject to operator control. The present invention comprises an infinite impulse response (IIR) filter and a proportional-integral (PI) feedback controller. The IIR filter receives input signals (commanded velocity or acceleration) from an ...

A system and method for eliminating swing motions in gantry-style cranes while subject to operator control is presented. The present invention comprises an infinite impulse response ("IIR") filter and a proportional-integral ("PI") feedback controller (50). The IIR filter receives input signals (46) (commanded velocity or acceleration) ...

... Descriptors : *LINEAR ACCELERATORS, OPERATION, ELECTRON ACCELERATORS, PARTICLE ACCELERATOR COMPONENTS, PARTICLE ...

Most motion control of robots requires effective on-line computation to compensate for nonlinear dynamics where much time is taken. Acceleration feedback may avoid these computations by online measurement of acceleration. In this paper, the stability is p...

An ignition feedback regenerative amplifier consists of an injector, a linear accelerator with energy recovery, and a high-gain free electron laser amplifier. A fraction of the free electron laser output is coupled to the input to operate the free electron laser in the regenerative mode. A mode filter in this loop prevents run away ...

The first successful experimental studies of microwave radiation from a co-axial Free-Electron Maser (FEM) based on two-dimensional (2D) distributed feedback have been recently conducted. This paper contains a description of the experimental set-up and the results obtained. The high-power pulsed power supply and high-current accelerator (HCA) developed and ...

The multibunch longitudinal feedback system developed for use by PEP-II, ALS and DA{Phi}NE uses a parallel array of digital signal processors to calculate the feedback signals from measurements of beam motion. The system is designed with general-purpose programmable elements which allow many feedback operating ...

The Los Alamos free electron (FEL) laser oscillator has successfully operated over a wavelength range from 9 to 11 ..mu..m with a peak output power of 5 MW and an average output power of 6 kW over a 70-..mu..s pulse length. The FEL is driven by a conventional rf linear accelerator operating at 1.3 GHz with a nominal energy of 20 MeV. ...

ARTEMIS is an online accelerator modeling server developed at CEBAF. One of the design goals of ARTEMIS was to provide an integrated modeling environment for high- level accelerator diagnostic and control applications such as automated beam steering, Linac Energy management (LEM) and the fast feedback system. This report illustrates ...

A computer controlled phase and amplitude detection system to measure and stabilize the rf power sources in the Stanford Linear Accelerator is described. This system measures the instantaneous phase and amplitude of a 1 microsecond 2856 MHz rf pulse and will be used for phase feedback control and for amplitude and phase jitter detection. This paper ...

Preliminary tests of a method for regulating the accelerator perveance of a high-power neutral beam, by controlling the plasma source have been conducted and are encouraging. The phase shifts and feedback paths were identified and quantified, and stabilization was achieved by adding an R-C snubber at the accelerator power supply output ...

Modern light sources and circular colliders employ large numbers of high-intensity particle bunches in order to achieve high luminosity. The electromagnetic coupling of bunches via resonant structures causes coherent instabilities at high beam currents. Achieving high luminosity requires the control of such unstable motion. Feedback control is challenging due to wideband ...

A method for tuning rf cavities that has fewer rf reflected power conditions and is easier for accelerator operators to use is presented. This method will also prepare the rf cavity tuning for future higher beam currents. The results and installation methods are discussed.

The phase and amplitude feedback-control systems for the Fusion Materials irradiation Test (FMIT) accelerator have been successfully prototyped and tested. The testing was performed at low power with two 100-W rf systems driving a high-Q resonant cavity at 80 MHz. The control systems can maintain the cavity field amplitude to within +-1% and the phase to ...

A system of ten rf cavities operating at 197 MHZ will provide longitudinal focusing during beam storage in the Relativistic Heavy Ion Collider (RHIC). The cavities and tetrode amplifiers are from CERN where they had been used in the Super Proton Synchrotron to accelerate leptons for injection into LEP. The amplifier-cavity system had an impedance pole ...

A method of controlling in a feedback manner the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine having an exhaust passage and an exhaust gas ingredient concentration sensor arranged in the exhaust passage, wherein a basic value of a fuel quantity to be supplied to the engine is determined, a correction coefficient which varies in response ...

The RF control system for a charged-particle accelerator must maintain the correct amplitude and phase of RF field inside the accelerator cavity in the presence of perturbations, noises, and time varying system components. For an accelerator with heavy beam-loading, fluctuations in the beam current cause large perturbations to the RF ...

The RF control system for a charged-particle accelerator must maintain the correct amplitude and phase of the RF field inside the accelerator cavity in the presence of perturbations, noises, and time varying system components. For an accelerator with heavy beam-loading, fluctuations in the beam current cause large perturbations to the ...

An air-fuel ratio control system is disclosed for an internal combustion engine having an emission control system with a three-way catalytic converter for controlling the air-fuel ratio in accordance with the temperature of the engine and operation of the engine. A temperature sensor for detecting the engine temperature and a negative pressure sensor for detecting the engine ...

Slow feedback has been developed to control the energy and energy spread of the beams which are injected into the SLC damping rings. Within a single RF pulse, two bunches of electrons and one bunch of positrons are accelerated to an energy of 1.21 GeV in the injector of the SLC. The two electron bunches are deflected into the north damping ring while the ...

This paper describes the implementation of the bunch-by-bunch longitudinal feedback system for the PEP-II B Factory. Bunch spacing down to 2 ns is achieved using 500 Megasamples per second A/D and D/A converters, and AT&T 1610 Digital Signal Processors are integrated to run a downsampled feedback algorithm for each bunch in parallel. This general ...

The most severe problem of the International Linear Collider is its high cost, resulting in part from the enormous length of the collider. This length is determined mainly by the achievable accelerating gradient in the RF system of the ILC. In the ILC project the required accelerating gradient is higher than 30 MeV/m. Further improvement of the coupling to ...

Accelerator transmutation of waste (ATW) is one approach for reducing the amount of actinides and long-lived fission products that eventually will be sent to a repository. The ATW accelerator generates high-energy protons, which strike a target and produce spallation neutrons. The spallation neutrons transmute waste in a region that surrounds the ...

The Reactor Accelerator Coupling Experiments (RACE) are a set of neutron source driven subcritical experiments under temperature feedback conditions. These experiments will involve coupling an accelerator driven neutron source to a TRIGA reactor system in a subcritical configuration. The accelerator source will ...

The growth rates of the longitudinal higher-order impedance-driven beam modes have greatly increased since the initial PEP-II design and commissioning. This increase is attributed to the addition of 6 1.2MW RF stations with 8 accelerating cavities in the HER and 2 1.2MW RF stations with 4 accelerating cavities in the LER, which allowed ...

A programmable longitudinal feedback system based on four AT&T 1610 digital signal processors has been developed as a component of the PEP-II R&D program. This Longitudinal Quick Prototype is a proof of concept for the PEP-II system and implements full speed bunch-by-bunch signal processing for storage rings with bunch spacings of 4 ns. The design implements, via ...

The Generic Lock system is a software framework that allows highly flexible feedback control of large distributed systems. It allows system operators to implement new feedback loops between arbitrary process variables quickly and with no disturbance to the underlying control system. Several different types of ...

... Accession Number : AD0623698. Title : A SIMPLE SYSTEM OF EVOLUTIONARY OPERATION SUBJECT TO EMPIRICAL FEEDBACK. ...

A bunch-by-bunch longitudinal feedback system has been used to control coupled-bunch longitudinal motion and study the behavior of the beam at ALS, SPEAR, PEP-II, and DAPHNE. Each of these machines presents unique challenges to feedback control of unstable motion and data analysis. Here the authors present techniques developed to adapt the ...

Vigilance experiments have been performed to study the relative efficiency of feedback operations in

Compares modes of operation: Electronic Code Book; Cipher Block Chaining; Cipher Feedback; Output Feedback; Counter

An apparatus for controlling supercharging pressure in a turbocharger is described comprising an exhaust turbine and a compressor, the apparatus comprising a variable geometry means at an inlet to the exhaust turbine, an exhaust bypass valve means bypassing the exhaust turbine, an operation detecting means which detects operating conditions of a device ...

Page 1. ARI Research Note 2009-09 Operational Assessment of Tools for Accelerating ... Operational Assessment of Tools for Accelerating Leader ...

A six-sector spiral ridge FFAG accelerator was constructed and successfully operated to accelerate electrons from 35 to 180 kev kinetic energy. Acceleration was by betatron action, supplemented by r-f acceleration when desired. The design was based on magnetostatic and orbit ...

Beam intensities in all of the accelerators at Fermilab will increase significantly when the Main Injector becomes operational and will cause unstable oscillations in transverse position and energy. Places where the coupled bunch oscillations could dilute emittances include the Booster, Main Injector, and Tevatron. This paper provides an overview of the ...

The stability requirements of the next generation of synchrotron radiation facilities have been achieved on insertion device beamlines of existing rings. However, one insertion device (ID) affects the stored beam and hence the performance of all the other beamlines. Since the effects of the undulators are cumulative, higher levels of performance are required of the accelerator ...

A method for accelerating searches for optimal control of photonic reagents is provided. Closed loop feedback is applied to control a quantum system. A direct search deterministic technique is used for refining said closed loop feedback control. A quantum...

Most of the current active structural control strategies for aseismic protection have been based on either full-state feedback (i.e., structural displacements and velocities) or velocity feedback. However, accurate measurement of the displacements and vel...

Abstract�Most modern computers or game consoles are equipped with powerful yet cost-effective graphics processing units (GPUs) to accelerate graphics operations. Though the graphics engines in these GPUs are specially designed for graphics operations, can we harness their computing power for more general nongraphics ...

role in climatic feedback mechanisms (Kellogg 1975 ) . A small perturbation in the cloud ...... process will be accelerated, due to the decrease in sur- ...

... The weighting coefficients wstruc and wact determined the ... accelerating RMA masses which produce the control ... forces for vibration attenuation. ...

... The identification of alpha particles with the aid of ... Descriptors : (*PARTICLE ACCELERATORS, OPERATION), (*PROTON ACCELERATORS ...

... BEAMS, BREMSSTRAHLUNG, GAMMA RAY SPECTROSCOPY, PARTICLE ACCELERATOR COMPONENTS, LINEAR ACCELERATORS. ...

... SPECTRUM ANALYZERS, MAGNETIC FIELDS, TRANSISTORS, ELECTRON ACCELERATORS, LINEAR ACCELERATORS, OPERATION, TEST ...

Modern accelerators face the challenge of supporting increased machine complexity and higher levels of utilization while relying on downsized maintenance and support groups. To improve system availability, reduce reliance on system experts and provide a systematic approach to problem solving, an interactive troubleshooting guide has been implemented for the CEBAF injector at ...

The Positron-Electron Project II (PEP-II) B Factory collider ended the final phase of operation at nearly twice the design current and 4X the design luminosity. In the ultimate operation state, eight 1.2 MW radio-frequency (rf) klystrons and 12 accelerating cavities were added beyond the original implementation, and the two storage ...

... Title : OPERATION OF ACCELERATOR-STORAGE RING TO PROVIDE ULTRAVIOLET RADIATION. Descriptive Note : Final rept.,. ...

This report discusses the following topics in relation to the Bevalac accelerator: accelerator technology operations summary; nuclear science; biomedical research; and publications and presentations.

In the SLC many feedback systems keep the beam under control. Here we concentrate on feedback systems which operate at 120 Hz or lower frequencies, so software can be used to make some decisions. The linac steering feedback uses beam position monitor data...

Active feedback stabilization of multiple resistive wall modes (RWMs) has been successfully proven in the EXTRAP T2R reversed field pinch. One of the features of plasma discharges operated with active feedback stabilization, in addition to the prolongation of the plasma discharge, is the sustainment of the plasma rotation. Sustained ...

... Accelerator Technology II, RF, Power Supplies, Operations; Linear Accelerators and Pulsed Power Devices; Linear Colliders; and CERN plans for ...

This report discusses the following research conducted at NSLS: atomic and molecular science; energy dispersive diffraction; lithography, microscopy and tomography; nuclear physics; UV photoemission and surface science; x-ray absorption spectroscopy; x-ray scattering and crystallography; x-ray topography; workshop on surface structure; workshop on electronic and chemical phenomena at surfaces; ...

At the start-up of the FP5 project PDS-XADS, the main initial specifications for the accelerator system (e.g. beam energy, beam intensity, beam profile, their stability and the accelerator availability and reliability) have been defined by Working Package 1 (WP1), 'Global Coherence', in connection with the other WPs of the project. From this, WP3 ('The ...

Historically, subcritical accelerator-driven systems have been called electronuclear devices. Interest in these devices has been revived for numerous nuclear applications, such as boron neutron capture therapy, accelerator transmutation of waste (ATW), and accelerator-based conversion (ABC). The latter systems are being investigated at ...

The DPC-2000 is an advanced control system utilizing the latest technology in computer control circuitry and components. Its overall design is modular and technologically advanced to keep up with customer and engineering demands. The full control system is presented as four units. They are the Remote I/O (Input / Output), Local Analog and Digital I/O, Operator Interface and ...

Page 1. AD-A216 275 * - VEHICLE ACCELERATION AND FUEL ... Vehicle Acceleration and Fuel Consumption When Operated on JP-8 Fuel (U) 12. ...

Because the voltage applied to magnets in accelerators is likely to be rectified, there can be 60 Hz related fluctuations in beam position and energy. Correcting such errors as well as other less repeatable errors can be done with combinations of feedback, feedforward, real time repetitive control, and batch update repetitive control. This paper studies ...

A free-electron maser (FEM) with a double-mirror resonator involving a new modification of Bragg structures operating on coupled propagating and quasi-cutoff (trapped) modes has been studied. The presence of trapped waves in the feedback chain improves the selectivity of Bragg resonators and ensures stable single-mode generation regime at a considerable ...

A feedback microprocessor has been built for the TEVATRON. It has been constructed to be applicable to hadron colliders in general. Its inputs are realtime accelerator measurements, data describing the state of the TEVATRON, and ramp tables. The microprocessor software includes a finite state machine. Each state corresponds to a specific TEVATRON ...

As accelerator beam intensity increases, loading of the RF system becomes a serious problem. Typical solutions include careful accelerating cavity design and active feedback schemes. Since the goal is to provide a low accelerating gap impedance, it is pos...

The successful operation of a designed system often involves feedback. Such feedback can be used to encourage what is going on in a system, discourage it, or reduce its discrepancy from some desired value. The stability of a system can be greater when it includes appropriate feedback mechanisms.

The possible operating modes of a distributed-feedback side coupled laser are discussed. A modal analysis of thin film distributed feedback lasers is presented and used to elucidate the mode of operation of the side coupled laser. Experimental observation...

The motive for the investigation reported here was avoidance of beam excitation and interaction with higher order modes of a waveguide supporting an intended accelerating mode and the lessening of wake field effects by using the largest mean diameter in the waveguide consistent with the operating frequency. Disk-loaded periodic structures are examined and ...

Landau damping by the octupolar tune spread is used to prevent the radial blowup of the beam during the acceleration cycle. The octupole field is produced by a set of pole face windings in the ring magnets. The strength of the octupole field, which is controlled by the Zero Gradient Synchrotron (ZGS) programmer, is set to give a tune profile of v/sub x/ = 0.83 + 0.008 x a/sup ...

Landau damping by the octupolar tune spread is used to prevent the radial blowup of the beam during the acceleration cycle. The octupole field is produced by a set of pole face windings in the ring magnets. The strength of the octupole field, which is controlled by the Zero Gradient Synchrotron (ZGS) programmer, is set to give a tune profile of ..nu../sub x/ = 0.83 + 0.008 x ...

From thirteenth international congress of radiology; Madrid, Spain (15 Oct 1973). Automatic three-dimensional dosimetry in electron beams is a method for either reducing any undesired distortion of the isodose curves or for modifying the usual isodose patterns to match any tumor shape. The term automatic'' is used to mean selfregulating or self-acting. The principle ...

This patent describes a gas turbine engine having fuel metering means for delivering fuel to the engine and including means for controlling the fuel metering means including speed control means and slave-datum control responsive to a speed request signal and limit signal for limiting the fuel metering means for producing a signal that is integrated with respect to time for controlling the speed ...

Beam-based feedback systems were a key element in the successful operation of the Stanford Linear Collider (SLC) but the performance was not optimal. Some limitations were incomplete communication between the feedback loops, slow correctors, and constraints on the placement of feedback devices. Recent beam ...

A single-photon avalanche detector is disclosed that is operable at wavelengths greater than 1000 nm

... Descriptors : *MAGNETIC CIRCUITS, *FERROMAGNETIC RESONANCE, SOLUTIONS(GENERAL), FEEDBACK, OPERATION, EXTERNAL ...