Use of tapered glass capillaries for producing microbeams

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1147463· OSTI ID:390550

Kim, K H; Brew, D L; Brown, F C; Stern, E A ^[1]; Heald, S M ^[2]

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1. University of Washington, Department of Physics, Box 351560, Seattle, WA 98195 (United States)
2. Pacific Northwest Laboratory, Richland, WA 99352 (United States)

The Pacific Northwest Consortium CAT is developing tapered glass capillaries using fiber optics techniques for fabrication. Previous calculations showed that, under ideal conditions and using Undulator A as a source, glass capillaries can produce higher intensity gains than those of mirrors for an output diameter of 5 micrometer or less. Recently, we fabricated several capillaries with approximately linear tapers and tested three of them with outlet diameters of 1.3, 1.4, and 12.4 micrometers and lengths of about 35{endash}90 cm. We obtained intensity gains over a pin hole of about 270, 240, and 30, respectively. They are about half of the calculated values expected from a perfectly linear profile. Also the angular spread of the output beam was much larger than the calculated value. We measured the profile of one capillary in detail and calculated the intensity for the capillary with the measured profile and still found significant differences. We also made calculations assuming several types of misalignment and found that they are important factors in understanding the larger angular divergence and reduced intensity. These results suggest improvements in the fabrication of the capillaries and in ways to support them during experiments. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Pacific Northwest National Laboratory
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 390550
• Report Number(s): CONF-9510119--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 67; ISSN RSINAK; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ALIGNMENT
CAPILLARIES
FABRICATION
GLASS
OPTICAL SYSTEMS
PERFORMANCE TESTING
SYNCHROTRON RADIATION
X-RAY EQUIPMENT