The SPEAR 3 Diagnostic Beam lines Page: 3 of 3
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Referring to the top of Fig. 2, the refractive lens can
also be configured as part of an optical interferometer. In
this mode, the visible light is imaged straight ahead on the
CCD camera after passing through a variable spacing
double-slit. Mitsuhashi reports measurement resolutions
approaching 1 m [5]. Fisher has constructed a similar
device at SLAC for PEP-II [15].
The second optical beam path is available for streak
camera measurements. Here's where it gets interesting - a
sub-nanosecond streak camera can measure a range of
single- and multi-bunch beam dynamic features in both
the longitudinal and transverse and planes [16].
Examples include:0
0
0
0Bunch length monitor/broadband impedance
Longitudinal single-bunch profile measurements
Microwave instability threshold
Coupled-bunch instability (longitudinal, transverse)SUMMARY
The SPEAR 3 pinhole camera has been commissioned
yet requires component upgrades and software refinement
to accurately image vertical beam sizes approaching 10
m. The optical beam line can accept photons into the
near UV region and is scheduled to open at the end of
2005. This beam line will initially be equipped with
refractive optics to image visible light on a fast-gated
camera. Build-out of the beam line includes photodiode
diagnostics, an optical interferometer, and streak camera
to study impedance and single- and multi-bunch beam
dynamics as the beam current is raised to 500 mA and
additional small-gap ID's are installed.
ACKNOWLEDGEMENTS
The authors would like to thank the SSRL technicians
and summer students who have contributed to the x-ray
pinhole and synchrotron light monitor projects. The
ongoing collaboration with J. Bergstrom is gratefully
acknowledged.REFERENCES
[1] A. Hofmann and F. Meot, "Optical Resolution of
Beam Cross-Section Measurements by Means of
Synchrotron Radiation", NIM 203, 1982, p. 483.
[2] H. Wiedemann, "Synchrotron Radiation", Springer-
Verlag, Berlin, 2003.
[3] A. Hofmann, "The Physics of Synchrotron
Radiation", Cambridge University Press, 2004.
[4] P. Elleaume et al., "Measuring Beam Sizes and
Ultra-Small Electron Emittances Using an X-ray
Pinhole Camera," J. of Synch. Rad. 2, 1995, p. 1774.
[5] T. Mitsuhashi, "Measurement of Small Transverse
Beam Size Using Interferometry," DIPAC 2001,
Grenoble, France, p. 26.
[6] A. Andersson, "Electron beam profile measurements
and emittance manipulation at the MAX-laboratory,
PhD Thesis, Lund, 1997.
[7] C. Limborg et al., "A Pinhole Camera for SPEAR
2," EPAC 2000, Vienna, p. 1774.
[8] C. Limborg et al., "An Ultra-Violet Light Monitor
for SPEAR 3," EPAC 2002, Paris, p. 1924.
[9] Roper Scientific, PiMax Camera, UV enhanced,
www.princetoninstruments.com.
[10] J. Safranek and P. Stefan, "Emittance Measurement
at the NSLS X-Ray Ring," EPAC 1996,
[11] www.GreyPoint.com (Flea model).
[12] J. Bergstrom, private communication.
[13] A. Mochihashi, "Observation of Transverse
Instability Using Bunch-by-Bunch Beam Diagnostic
System in KEK-PF," EPAC 2000.
[14] M. Tobiyama et al, "Measurement of Bunch Time-
Structure in KEK PF," PAC 2003, p. 2409.
[15] A. Fisher, "A Synchrotron-Light Interferometer for
PEP-II," BIW 2000, Cambridge, MA.
[16] K. Scheidt, "Review of Streak Cameras for
Accelerators: Features, Applications and Results,"
EPAC 2000, Vienna, p. 182.
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Corbett, W. J.; Limborg-Deprey, C.; Mok, W. Y. & Ringwall, A. The SPEAR 3 Diagnostic Beam lines, article, March 14, 2006; Menlo Park, California. (https://digital.library.unt.edu/ark:/67531/metadc874248/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.