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Title: Status of the SLC damping rings

Abstract

Electron beams of full design energy 1.21 GeV and nearly full design intensity 4 x 10/sup 10/ particles/pulse (design 5 x 10/sup 10/) have been extracted from the Stanford Linac and successfully stored in the electron damping ring. Beams of less intensity have been extracted from the ring and reinjected into the Linac. The present intensity limits are not thought to be fundamental. The operating experience with the electron ring and the status of the construction of the positron ring will be discussed. 11 refs., 1 fig., 2 tabs.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, CA (USA)
OSTI Identifier:
5573299
Report Number(s):
SLAC-PUB-3716
ON: DE85015261
DOE Contract Number:
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: Paper copy only, copy does not permit microfiche production. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; STANFORD LINEAR COLLIDER; DAMPING; STORAGE RINGS; ELECTRON BEAMS; PERFORMANCE; STANFORD 20-GEV LINAC; ACCELERATOR FACILITIES; ACCELERATORS; BEAMS; LEPTON BEAMS; LINEAR ACCELERATORS; PARTICLE BEAMS; 430100* - Particle Accelerators- Design, Development, & Operation

Citation Formats

Hutton, A.M., Davies-White, W.A., Delahaye, J.P., Fieguth, T.H., Hofmann, A., Jager, J., Kloeppel, P.K., Lee, M.J., Linebarger, W.A., and Rivkin, L.. Status of the SLC damping rings. United States: N. p., 1985. Web. doi:10.2172/5573299.
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Hutton, A.M., Davies-White, W.A., Delahaye, J.P., Fieguth, T.H., Hofmann, A., Jager, J., Kloeppel, P.K., Lee, M.J., Linebarger, W.A., & Rivkin, L.. Status of the SLC damping rings. United States. doi:10.2172/5573299.
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Hutton, A.M., Davies-White, W.A., Delahaye, J.P., Fieguth, T.H., Hofmann, A., Jager, J., Kloeppel, P.K., Lee, M.J., Linebarger, W.A., and Rivkin, L.. Sat . "Status of the SLC damping rings". United States. doi:10.2172/5573299. https://www.osti.gov/servlets/purl/5573299.
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@article{osti_5573299,
title = {Status of the SLC damping rings},
author = {Hutton, A.M. and Davies-White, W.A. and Delahaye, J.P. and Fieguth, T.H. and Hofmann, A. and Jager, J. and Kloeppel, P.K. and Lee, M.J. and Linebarger, W.A. and Rivkin, L.},
abstractNote = {Electron beams of full design energy 1.21 GeV and nearly full design intensity 4 x 10/sup 10/ particles/pulse (design 5 x 10/sup 10/) have been extracted from the Stanford Linac and successfully stored in the electron damping ring. Beams of less intensity have been extracted from the ring and reinjected into the Linac. The present intensity limits are not thought to be fundamental. The operating experience with the electron ring and the status of the construction of the positron ring will be discussed. 11 refs., 1 fig., 2 tabs.},
doi = {10.2172/5573299},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1985},
month = {Sat Jun 01 00:00:00 EDT 1985}
}
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Technical Report:
View Technical Report (0.21 MB)
DOI:  10.2172/5573299
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  • ;
    The transverse damping rates of the SLC electron and positron damping rings have been measured during the high current physics run at, I = 3.5 {times} 10{sup 10} particles per bunch. The measurements, done over a period of two months, show large fluctuations exceeding the statistical uncertainty of each measurement. The longitudinal damping rate of the positron damping was also measured.

  • The longitudinal microwave instability is present in the SLC damping rings during routine operations. Experimental studies of the instability at nominal conditions have been reported previously. To complement those studies and better understand the properties of the instability a series of dedicated experiments were performed under a broad range of operating parameters. These experiments included spectral measurements of BPM signals as well as time domain diagnostics using a custom detecting circuit. This paper describes the techniques, the results and discusses possible interpretations of these measurements.

  • ; ;
    In the Stanford Linear Collider (SLC) each beam, after leaving a damping ring, is compressed in the Ring-to-Linac (RTL) transfer line before entering the linear accelerator. At a bunch population of 4.0 {times} 10{sup 10} particles, due to the limited energy acceptance of the RL, approximately 15% of the beam has normally been lost. During the 1996 run, however, to eliminate this loss the bunch was partially precompressed in the damping ring, just before extraction; the beam loss in the RTL was reduced to almost zero. In Ref. 1 the operation and performance of precompression are presented. Also given ismore » an analysis which, however, does not include the effects of the longitudinal wakefield on the beam dynamics. In this report the authors extend that analysis to include these effects.« less

  • ;
    A longitudinal single-bunch instability in the damping rings at the Stanford Linear Collider (SLC) is thought to contribute to pulse-to-pulse orbit variations in downstream accelerator sections. To better understand this instability, the authors measured the beam phase and bunch length under harmonic modulations of the rf phase and rf voltage. For small phase-modulations the measured response can be explained by interaction of the beam with the cavity fundamental mode. For larger excitations, they observed bifurcation and hysteresis effects. The response to an rf voltage modulation revealed two peaks near the quadrupole-mode frequency, one of which appears to be related tomore » the longitudinal instability. In this paper they present the experimental results.« less

  • At high currents the longitudinal phase space of the SLC beam is not simply described by gaussian distributions in both position and energy. The distorted ring beam, the curvature of the compressor rf, the limited energy aperture of the RTL, the wakefields in the linac, and the momentum compaction in the arc all contribute to some extent to a distortion of longitudinal phase space. In this paper we present simulation results that describe the phase space of the SLC beam, from the damping rings to the final focus area, and that include all these distorting effects. From bunch length measurementsmore » in the SLC it was discovered that the damping ring beam is lengthened and is clearly not gaussian. One author describes a potential well calculation for the ring bunch shape that agrees remarkably well with the measurements. These calculated shapes are the starting point for the simulations described in this paper. These initial distributions are propagated through the RTL, then the linac, and then the arcs. We will address questions of the bunch shape, beam tilt, beam loss, and tail population at the end of the RTL. Following this we discuss the energy spectrum at the end of the linac and the bunch shape when the beam reaches the final focus. Finally, in Appendix A we describe a method of measuring the bunch shape and the induced voltage in the SLC linac. 22 refs., 9 figs.« less