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The numerical simulation of accelerator components

Description: The techniques of the numerical simulation of plasmas can be readily applied to problems in accelerator physics. Because the problems usually involve a single component ''plasma,'' and times that are at most, a few plasma oscillation periods, it is frequently possible to make very good simulations with relatively modest computation resources. We will discuss the methods and illustrate them with several examples. One of the more powerful techniques of understanding the motion of charged particle… more
Date: May 1, 1987
Creator: Herrmannsfeldt, W.B. & Hanerfeld, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-power rf-pulsed modulators for the Los Alamos free-electron laser

Description: In the rf-driven free-electron laser (FEL) at the Los Alamos National Laboratory, there are two pulsed-power rf modulators as sources for two tandem, side-coupled 20-MeV linear accelerators. The rf power used to control the cavity fields is supplied by two 5.5-MW modulating anode klystrons operating at a center frequency of 1300.2 MHz. The modulation of the 125 kV klystron is achieved by using a triode switch tube that provides a pulse width up to 300 ..mu..s and a pulse repetition rate up to 1… more
Date: September 1, 1987
Creator: Johnson, W. J. D.; Lynch, M. T.; Tallerico, P. J.; Keffeler, D. R. & Hornkohl, J. O.
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Partner: UNT Libraries Government Documents Department
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Recent performance of the Intense Pulsed Neutron Source accelerator system

Description: The Intense Pulsed Neutron Source (IPNS) accelerator system has now been in operation as part of a national user program for over five years. During that period steady progress has been made in both beam intensity and reliability. Almost 1.8 billion pulses totaling 4 x 10/sup 21/ protons have now been delivered to the spallation neutron target. Recent weekly average currents have reached 15 ..mu..A (3.2 x 10/sup 12/ protons per pulse, 30 pulses per second) and short-term peaks of almost 17 ..mu… more
Date: March 1, 1987
Creator: Potts, C.; Brumwell, F.; Rauchas, A.; Stipp, V.; Volk, G. & Donley, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The rf system of the Synchrotron X-ray Source at Argonne

Description: A Positron Storage Ring for the Synchrotron X-ray Source at Argonne is under design. The rf system is described. The rf system is divided into four stations, each using a one-megawatt klystron to excite four single-cell spherical cavities to a gap voltage of 761 kV at the operating frequency of 350.8 MHz. The same klystron also provides the beam power for synchrotron radiation losses of the position beam of up to 300 mA, the higher-order-mode power losses, the power losses in the beam due to th… more
Date: January 1, 1987
Creator: Kustom, R.L.; Mavrogenes, G. & Nicholls, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microwave system for the microwave tokamak experiment (MTX)

Description: The microwave system for the Microwave Tokamak Experiment (MTX) will include part of the Lower Hybrid Heating (LHH) system used at Massachusetts Institute of Technology (MIT) on the Alcator machine and the new Free Electron Laser (FEL) microwave system being developed at LLNL. The LHH system for MTX will be two carts of four klystrons, each with a nominal total power of 2.1 MW at 4.6 GHz. The FEL system will deliver 2-MW average power at 250 GHz. 50 ns pulses every 200 ..mu..s of 8 gigawatt pea… more
Date: October 1, 1987
Creator: Felker, B.; Ferguson, W.; Heefner, J.; Krause, K.; Makowski, M. & Yamamoto, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Initial operation of a high-power whispering-gallery-mode gyrotron

Description: Varian has begun the development of a high-power gyrotron based on a whispering-gallery-mode interaction circuit. The first experimental tube has been designed to generate pulsed output powers up to 1 MW at a frequency of 140 GHz. The tube was also designed for CW operation at power levels of several hundred kilowatts. The overall design of the tube is discussed. Fabrication of the tube is nearing completion and initial tests on the tube will be carried out in the near future. 5 refs., 2 figs.
Date: October 1, 1987
Creator: Felch, K.; Ives, L.; Jongewaard, E.; Jory, H. & Spang, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design of a wiggler-focused, sheet beam X band klystron

Description: An X band klystron using a sheet beam and wiggler focusing was simulated using the 2 + 1/2 dimensional particle in cell code MASK. Simulation of the rf cavities was by means of the port approximation used in modelling of standard klystrons. The wigglers, which would need permanent magnets to achieve the required field strengths, were modelled using an idealized analytic expression with an exponential rise and a linear taper superimposed on a sinusoidal variation. Cavity locations and tunings we… more
Date: February 1, 1987
Creator: Eppley, K. R.; Herrmannsfeldt, W. B. & Miller, R. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Rf-driver linear colliders

Description: The next generation of linear collider after the SLC (Stanford Linear Collider) will probably have an energy in the range 300 GeV-1 TeV per linac. A number of exotic accelerating schemes, such as laser and plasma acceleration, have been proposed for linear colliders of the far future. However, the technology which is most mature and which could lead to a collider in the above energy range in the relatively near future is the rf-driven linac, in which externally produced rf is fed into a more or… more
Date: May 1, 1987
Creator: Wilson, Perry B.
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Partner: UNT Libraries Government Documents Department
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RF pulse compression development

Description: The body of this paper discusses the theory and some rules for designing a multistage Binary Energy Compressor (BEC) including its response to nonstandard phase coding, describes some proof-of-principle experiments with a couple of low power BECs, presents the design parameters for some sample linear collider rf systems that could possibly use a BEC to advantage and outlines in the conclusion some planned R and D efforts. 8 refs., 26 figs., 4 tabs.
Date: October 1, 1987
Creator: Farkas, Z. D. & Weaver, J. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Computer simulation of the lasertron with a ring model

Description: The lasertron is more efficient, lighter, and smaller than a klystron, especially at outputs below 2 GHz. Higher peak output powers are possible with the lasertron, and a separate modulator is not required. These advantages are useful for rf accelerators and linear colliders. The electron dynamics are simulated to estimate the device performance limits and to design an experimental lasertron. The relativistic electron dynamics are followed from the photocathode through the acceleration region a… more
Date: March 16, 1987
Creator: Tallerico, P.J. & Coulon, J.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental progress on virtual-cathode very high power microwave source development

Description: The evolution of rf accelerator technology toward high-power, high-current, low-emittance beams produces an ever-increasing demand for efficient, very high power microwave sources. The present klystron technology has performed very well but is not expected to produce reliable gigawatt peak-power units in the 1- to 10-GHz regime. Further major advancements must involve other types of sources. The reflexing electron sources can produce microwave powers at the gigawatt level and have demonstrated … more
Date: January 1, 1987
Creator: Fazio, M. V. & Hoeberling, R. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Performance of the SLAC Linear Collider klystrons

Description: There are now 200 new, high power 5045 klystrons installed on the two-mile Stanford Linear Accelerator. Peak power per klystron averages over 63 MW. Average energy contribution is above 240 MeV per station. Electron beam energy has been measured as high as 53 GeV. Energy instability due to klystron malfunction is less than 0.2%. The installed klystrons have logged over one million operating hours with close to 20,000 klystron hours cumulative operating time between failures. Data are being accu… more
Date: January 1, 1987
Creator: Allen, M. A.; Fowkes, W. R.; Koontz, R. F.; Schwarz, H. D.; Seeman, J. T. & Vlieks, A. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The status of the SLC

Description: On October 10,1987, the SLC ceased commissioning activities to move the Mark II detector into the beam line for the spring physics run. The planned shutdown is for a period of 13 weeks. In this paper, the various subsystems and their status as of October 10, 1987 are briefly discussed. 3 refs., 4 figs., 1 tab.
Date: November 1, 1987
Creator: Ruth, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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