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Title: Single-cavity SLED device


The conventional SLED device used at SLAC requires two cavities. However, the same effect can be obtained with a single cavity; the theory and operation of the device is the same, only the hardware is changed. The single-cavity device is described here.

Publication Date:
Research Org.:
Stanford Linear Accelerator Center, CA (USA)
OSTI Identifier:
Report Number(s):
ON: DE85002587
DOE Contract Number:
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States

Citation Formats

Lippmann, B.A. Single-cavity SLED device. United States: N. p., 1984. Web. doi:10.2172/6388264.
Lippmann, B.A. Single-cavity SLED device. United States. doi:10.2172/6388264.
Lippmann, B.A. Sat . "Single-cavity SLED device". United States. doi:10.2172/6388264.
title = {Single-cavity SLED device},
author = {Lippmann, B.A.},
abstractNote = {The conventional SLED device used at SLAC requires two cavities. However, the same effect can be obtained with a single cavity; the theory and operation of the device is the same, only the hardware is changed. The single-cavity device is described here.},
doi = {10.2172/6388264},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 1984},
month = {Sat Sep 01 00:00:00 EDT 1984}

Technical Report:

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  • This note discusses the effect of SLED cavity temperature changes and resulting cavity detuning on the effective accelerating field delivered by the linac. This effect is of interest because the power dissipated in the SLED cavities depends on the repetition rate at which the linac operates and there is experimental evidence that the present water cooling system on the cavities is not sufficient to keep the copper temperature constant enough. As a result, for optimum operation of the collider, it may be necessary to adjust the water temperature as a function of repetition rate or to retune the cavities bymore » mechanical means.« less
  • This report presents the results of noise data measurements of the Holloman AFB rocket-sled test-track operations. Impulse and community noise measurements were made to determine the impact of the rocket-sled noise on the surrounding community. A worst case sled run was measured and used to determine that the rocket sled has very little impact on the community for a worst-case rocket-sled run and little or no impact for the majority of the runs. Recommendations were made to limit the number of people exposed to the rocket sled noise and require test-track personnel to wear hearing protection. Sonic-boom measurement equipment shouldmore » be purchased to document all sonic booms created by the rocket sled.« less
  • The 3 km long linac at the Stanford Linear Accelerator Center (SLAC) is used for fixed target experiments such as E-155, with energies up to 50 GeV. The SLAC Energy Development (SLED) system increase the maximum no-load energy by a factor of 1.6, but it also causes a varying beam energy curve. To provide a long pulse or bunch train for the experiment the energy profile has to be flat. Besides more sophisticated methods such as varying the phase of two klystrons feeding one structure section as proposed in the NLC design, we describe the method used for E-155 inmore » spring of 1997. The desired low charged beam didn't have any significant beam loading, but by inserting a 180{degree} phase notch during the SLED pulse, a beam pulse of up to 500 ns was achieved. The energy range without compensation would have been 15%, while with compensation the energy spread was reduced to about 0.15%. The phase notch was achieved by triggering a pair of two additional 180{degree} phase switches about half a structure fill-time after the SLED pulse was triggered. Simulations are compared with the experimental result.« less
  • A proposed, high charge, fixed target experiment (E-158) is planned to run with the highest possible energies available at the Stanford Linear Accelerator Center (SLAC), at 45 and 48 Gev. The charge is up to 6 {center_dot} 10{sup 11} particles in a 370 ns long beam pulse. The SLAC Energy Development (SLED) rf system generates an increasing no-load beam energy, with a linearly decreasing slope. We show how to obtain a current variation that tracks the no-load voltage, resulting in zero energy spread. We discuss the results of a lower energy experiment that verifies the predicted charge and current atmore » the energies required for E-158.« less
  • This report summarizes probable causes and contributing factors that led to a rocket motor initiating prematurely while employees were preparing instrumentation for an AIII rocket sled test at SNL/NM, resulting in a Type-B Accident. Originally prepared by the Technical Advisory Team that provided technical assistance to the NNSA's Accident Investigation Board, the report includes analyses of several proposed causes and concludes that the most probable source of power for premature initiation of the rocket motor was the independent battery contained in the HiCap recorder package. The report includes data, evidence, and proposed scenarios to substantiate the analyses.