ORNL, Oak Ridge, Tennessee
With the increase of average power of present and future high intensity proton rings and rapid progress of laser technology, laser-assisted stripping become a real alternative for carbon foils that are used for charge-exchange injection. High efficiency laser stripping, achieved experimentally at Spallation Neutron Source in Oak Ridge, TN, paved the way to full scale devices of such type. This paper presents overview of machines and choices of parameters for future powerful accelerators with possible laser stripping use.
ORNL, Oak Ridge, Tennessee
The Spallation Neutron Source (SNS) has been in commissioning and then operation since 2002. Beam Instruments for full operation and transition to beam powers of 1.0 MW and beyond needs to evolve to mostly non-intrusive, parasitically available and functioning at 30-60 Hz. High power operation necessitates careful monitoring to minimize un-controlled losses. In this paper, we discuss the overview of all diagnostics and present new improvements to, beam loss monitoring system, transverse and longitudinal laser profile monitors, introduction of laser emittance, addition of view screens at various locations and Mid-IR camera to observe electron deposit due to carbon foils at ring injection area. We also present the challenges in the ring instrumentations to have three decades of response and .01% losses.
Fermilab, Batavia, Illinois
High intense hadron beams of > 2 MW beam power are a key element for the new proposed Neutrino experiments at Fermilab. Therefore a new beam facility, called Project-X, is under discussion. We will present requirements, and first conceptual ideas for beam instrumentation and diagnostics, and the related R&D initiatives taking place in the high intense test accelerators, currently under construction. First results of beam profile measurements using OTR screens and laser wires are shown.
ORNL, Oak Ridge, Tennessee
Charged-particle beam diagnostic devices such as wire scanners and wire harps provide data sets describing the one-dimensional density distributions at a particular location; these data are commonly called profile data. We use these data for further computations, usually beam properties such as position and size. Typically these data require subjective, human, processing to extract meaningful results; this is inefficient and labor intensive. Our ultimate goal is to automate these computations, at least streamline the process. If we hope to implement any type of automation we must make real world considerations. Specifically, we consider information content, noise in the data, and sampling theory. Within this framework we create a general model for the data sets. Using signal processing techniques we identify the minimal sampling requirements for maintaining information content. Using Bayesian analysis we identify the most probable Gaussian signal within the data. We present the major obstacles currently faced concerning robust automation techniques.
BNL, Upton, Long Island, New York
ORNL, Oak Ridge, Tennessee
The charge to this working group was the following:
- Summarize the state of the art in H- charge-exchange injection.
- Summarize recent developments and future possibilities for novel injection techniques.
- Summarize the problems encountered, the needs for further development and improvements in injection and extraction of high-intensity beams.
- Summarize the state-of-the art in collimation system design.
- Summarize the status of benchmarking of collimation system efficiency and performance.