this paper presents a modified 32-bit rom-based direct digital frequency synthesizer (ddfs). maximum output frequency of the ddfs is limited by the structure of the accumulator used in the ddfs architecture. the hierarchical pipeline accumulator (hpa) presented in this paper has less propagation delay time rather than the conventional structures. therefore, it results in both higher maximum ope...

This note presents a possible design for the transfer line between the proton driver accumulator and compressor rings of the CERN Neutrino Factory. Based on the layout of the two rings presented in Ref. [1], a possible configuration for the transfer line is studied. The geometry and the optics of such a transport system are discussed in details.

Clearing electrodes have been successfully used to remove the ion from the vacuum chamber in many electron accelerators, especially in electron synchrotron light source. Electron cloud caused beam instabilities and vacuum pressure rise are becoming more and more important with the increasing beam intensity in recent years. In this paper we have explored the mechanism to clear the electron cloud...

We present new precision measurements of the ψ(2S) total and partial widths from excitation curves obtained in antiproton-proton annihilations by Fermilab experiment E835 at the Antiproton Accumulator in the year 2000. A new technique of complementary scans was developed to study narrow resonances with stochastically cooled antiproton beams. It relies on precise revolution-frequency and orbit-l...

In this paper we are concerned with line detection for scene modelling. So we focus on horizontal and vertical lines and we propose a fast local approach to detect lines in binary images. The approach described here can easily be extended to lines characterized by other directions. Pixels are analysed using an accumulator on a block-based basis in order to obtain possible line segments for each...

The transverse stability and broadening of the beam turn out to be the most problematic issues in the Spallation Neutron Source ring operation. The particle simulation code ORBIT, initially written for space charge and halo growth studies, now is able to cover a broad spectrum of the accumulator ring problems. Here we present an implementation of a collective force simulation due to impedance e...

We present here an accelerator modeling suite that integrates the capability of MAD-X and UAL packages, based on the Standard eXchange Format (SXF) interface. The resulting environment introduces a collection of accelerator applications ranging from the lattice design to complex beam dynamics studies. The extended capabilities of the MADX-UAL integrated approach have been tested and effectively...

An accumulator and cycling unit from the Electronic Numerical Integrator and Calculator (ENIAC) are implemented on a Field Programmable Gate Array (FPGA). The FPGA implementation is not architecturally identical to the original ENIAC, but the original architectural design is maintained where possible. The design maintains decimal number representation, ring counters to increment numbers, and te...

This paper presents a novel concept of active pneumatic suspension which uses an accumulator, airspring, and smart control system to actuate a variable orifice mechanism which connects the airspring to the accumulator. The main objective is to obtain a linear model for this pneumatic suspension so as to use existing advanced linear control methodologies to ascertain the closed loop performance ...