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in creator/contributor: "Kerns, C."  
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E-537 MWPC amplifier

Description: The design of a fast MWPC amplifier for the beam chambers and the absorber chamber is completed and all parts are on order. A prototype 16 channel board has been built and satisfactorily tested. Artwork is completed for the board and out to be photographed. The board fabrication contract has been let. Listed below is a summary of the amplifier characteristics as well as test results obtained with the prototype.
Date: September 17, 1979
Creator: Kephart, R. & Kerns, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measuring the orbit length of the Tevatron

Description: The orbit length in the Tevatron was measured when coasting beam was first obtained. The method was time-of-flight, using a vernier phase comparison between beam pickup signals and a synthesizer sine wave. Some effort was spent making a stable phase detector so that it would not be a limiting factor. The results exhibited a repeatability of a few Hz at 53 MHz, corresponding to a mean radius measurement to 0.1 mm. 5 refs., 4 figs.
Date: June 1, 1985
Creator: Kerns, C.; Kerns, Q. & Miller, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New low-level rf system for the Fermilab Booster synchrotron

Description: This paper describes the Booster low-level rf system that was constructed to meet these recently added requirements: (1) synthesizer controlled capture frequency at injection, (2) very low-phase noise over the machine cycle, (3) smooth phase-lock of beam to an external reference frequency and (4) ability to accelerate either a full turn or partial turn of beam.
Date: March 1, 1987
Creator: Kerns, C.; Crisp, J.; Kerns, Q. & Miller, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tevatron global radius and 0s system

Description: It has been found to be practical to extract a turn-average measurement of bunch beam phase relative to cavity gap voltage. This 0s signal shows the bunch position on the rf wave throughout injection, acceleration and extraction, including coherent synchrotron oscillations when present. In turn, the time derivative of 0s is a direct measure of global radial position error. We use the 0s signal, driving a phase shifter in the rf low-level system, to damp coherent synchrotron oscillations. Design… more
Date: June 1, 1985
Creator: Bristol, S.; Kerns, C.; Kerns, Q. & Miller, H.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fermilab Tevatron high level rf accelerating systems

Description: Eight tuned rf cavities have been installed and operated in the F0 straight section of the Tevatron. Their mechanical placement along the beam line enables them to be operated for colliding beams as two independent groups of four cavities, group 1-4 accelerating antiprotons and group 5-8 accelerating protons. The only difference is that the spacing between cavities 4 and 5 was increased to stay clear of the F0 colliding point. The cavities can easily be rephased by switching cables in a low-lev… more
Date: June 1, 1985
Creator: Kerns, Q.; Kerns, C.; Miller, H.; Tawser, S.; Reid, J.; Webber, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Longitudinal damping in the Tevatron collider

Description: This paper describes the damper design for 6 proton on 6 pbar bunches in the Tevatron collider. Signal pickup, transient phase detection, derivative networks, and phase correction via the high-level rf are covered. Each rf station is controlled by a slow feedback loop. In addition, global feedback loops control each set of four cavities, one set for protons and one set for antiprotons. Operational experience with these systems is discussed. 7 refs., 9 figs.
Date: March 1, 1989
Creator: Kerns, Q. A.; Jackson, G.; Kerns, C. R.; Miller, H.; Reid, J.; Siemann, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Programmable high power beam damper for the Tevatron

Description: A bunch-by-bunch beam damper has been developed for the Fermilab Tevatron. The system reduces betatron oscillation amplitudes and incorporates some useful machine diagnostics. The device is programmable via look-up tables so the output is an arbitrary function, on a bunch-by-bunch basis, of the beam displacement. We are presently using this feature to measure the betatron tune throughout the acceleration cycle. 4 refs.
Date: June 1, 1985
Creator: Crisp, J.; Goodwin, R.; Gerig, R.; Johnson, M.; Jones, A.; Kerns, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Antiproton acceleration in the Fermilab Main Ring and Tevatron

Description: The operation of the Fermilab Main Ring and Tevatron rf systems for colliding beams physics is discussed. The changes in the rf feedback system required for the accelration of antiprotons, and the methods for achieving proper transfer of both protons and antiprotons are described. Data on acceleration and transfer efficiencies are presented.
Date: March 1, 1987
Creator: Martin, P.; Dinkel, J.; Ducar, R.; Kerns, C.; Kerns, Q.; Meisner, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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