Measuring micron size beams in the SLC final focus
- and others
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 um 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.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (United States); Allied-Signal, Inc., Kansas City, MO (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515; AC04-76DP00613
- OSTI ID:
- 10193627
- Report Number(s):
- SLAC-PUB-6615; CONF-9410219-6; ON: DE95002780; TRN: 94:023921
- Resource Relation:
- Conference: Beam instrumentation workshop,Vancouver (Canada),2-6 Oct 1994; Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
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