Measuring micron size beams in the SLC final focus
Abstract
A pair of high resolution wire scanners have been built and installed in the SLC final focus. The final focus optics uses a set of de‐magnifying telescopes, and an ideal location for a beam size monitor is at one of the magnified image points of the interaction point. The image point chosen for these scanners is in the middle of a large bend magnet. The design beam spots here are about 2 microns in the vertical and 20 microns in the horizontal plane. The scanners presented a number of design challenges. In this paper we discuss the mechanical design of the scanner, and fabrication techniques of its ceramic wire support card which holds many 4 and 7 μm carbon wires. Accurate motion of the wire during a scan is critical. In this paper we describe tests of stepper motors, gear combinations, and radiation hardened encoders needed to produce the required motion with a step resolution of 80 nanometers. Also presented here are the results of scattered radiation detector placement studies carried out to optimize the signal from the 4 micron wires. Finally, we present measurements from the scanner.
Related Papers
- → Effects of SiC contents on the microstructure and mechanical properties of Al4SiC4–SiC ceramic composites(2023)6 cited
- → Nanocrystalline NiAl-TiC Composites Sintered by the Pulse Plasma Method(2006)1 cited
- Susquehanna Chorale Spring Concert "Roots and Wings"(2017)
- → Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering(2016)
- → Retracted: XRD Peak Profile Analysis of SiC Reinforced Al2O3 Ceramic Composite Synthesized by Electrical Resistance Heating and Microwave Sintering: A Comparison(2023)