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Paper Title Other Keywords Page
MOP40 A Study Of Coupler-Trapped Modes In X-Band Linacs for the GLC/NLC simulation, emittance, linear-collider, linac 129
 
  • R.M. Jones, V.A. Dolgashev
    SLAC/ARDA, Menlo Park, California
  • Z. Li
    SLAC, Menlo Park, California
  • J. Wang
    SLAC/ARDB, Menlo Park, California
  Each of the X-band accelerating structures for the GLC/NLC consist of 55 cells which accelerate a train of charged particles. The cells are carefully designed to ensure that the transverse wakefield left behind each bunch does not disrupt the trailing bunches. However, unless attention is paid to the design of the fundamental mode coupler, then a dipole mode is trapped in the region of the coupler and cells. This mode can give rise to severe emittance dilution if care is not taken to avoid a region of resonant growth in the emittance. Here, we present results on HFSS simulations, cold test experimental measurements and beam dynamics simulations arising as a consequence of the mode trapped in the coupler. The region in which the trapped mode has little influence on the beam is delineated.  
 
MOP41 Emittance-Imposed Alignment and Frequency Tolerances for the TESLA Linear Collider emittance, linac, dipole, luminosity 132
 
  • N. Baboi
    DESY, Hamburg
  • R.M. Jones
    SLAC/ARDA, Menlo Park, California
  One option in building a future 500 GeV c.m. collider is to use superconducting 1.3 GHz 9-cell cavities. Wakefields excited by the bunch train in the TESLA linac can resonantly drive the beam into unstable operation such that a BBU (Beam Break Up) mode results or at the very least significant emittance dilution occurs. The largest kick factors (proportional to the transverse fields which transversely kick the beam off axis) are found in the first three dipole bands and hence multi-bunch emittance growth is mainly determined from these bands. These higher order dipole modes are damped by carefully orientating higher order mode couplers at the downstream end of the cavities. We investigate the dilution in the emittance of a beam injected with an initial offset from the axis of the cavities. The dependence of beam emittance on systematic errors in the cell frequencies is investigated. We also vary the bunch spacing in order to simulate a systematic frequency error. While scanning the bunch spacing over a wide range, the emittance presents sharp peaks since only few modes contribute effectively to emittance growth. The locations of these peaks sets the frequency tolerances on the structures.  
 
MOP64 Wire Measurement of Impedance of an X-Band Accelerating Structure impedance, dipole, linear-collider, resonance 165
 
  • N. Baboi
    DESY, Hamburg
  • G. Bowden, V.A. Dolgashev, R.M. Jones, J. Lewandowski, S.G. Tantawi, J. Wang
    SLAC/ARDA, Menlo Park, California
  Several tens of thousands of accelerator structures will be needed for the next generation of linear collders known as the GLC/NLC (Global Linear Collider/Next Linear Collider). To prevent the beam being driven into a disruptive BBU (Beam Break Up) mode or at the very least, the emittance being signifcantly diluted, it is important to damp down the wakefield left by driving bunches to a manageable level. Manufacturing errors and errors in design need to be measurable and compared with predictions. We develop a circuit model of wire-loaded X-band accelerator structures. This enables the wakefield (the inverse transform of the beam impedance) to be readily computed and compared with the wire measurement. We apply this circuit model to the latest series of accelerating for the GLC/NLC. This circuit model is based upon the single-cell model developed in [1] extended here to complete, multi-cell structures.

[1] R.M. Jones et al, 2003, Proc. PAC2003 (also SLAC-PUB 9871)

 
 
TU201 The KEK C-Band RF System for a Linear Collider linac, klystron, linear-collider, RF-structure 256
 
  • H. Matsumoto, S. Takeda, S.S. Win, M. Yoshida
    KEK, Ibaraki
  • H. Baba, T. Shintake
    RIKEN Spring-8 Harima, Hyogo
  • J-O. Oh
    PAL, Pohang
  The C-band (5712 MHz) main linac has been developed just motivated by the urgent and essential physics program at the e+e- linear collider. In total ~8000 accelerating structures and ~4000 klystrons with modulators are needed for 500 GeV C.M. energy. Therefore these units have to meet strict requirements for: high reliability, simplicity, easy operation, reasonable power efficiency and low cost. This list provides a guiding principle and the boundary conditions for our design work. We have already developed the conventional and PPM type 50 MW class C-band klystrons, modulators, and HOM-free accelerator structures. The first high power an rf compressor cavity made of a low thermal expansion material was designed to provide stable operation even with a very high Q of 200 k, it was successfully operated an output rf power of 135 MW at KEK. The C-band linac rf-system will be used for the SASE-FEL project at SPring-8, but it will also serve to verify the design and components, which can eventually be deployed for the main linac rf system in a future linear collider.  
Transparencies
 
TU203 High Pressure, High Gradient RF Cavities for Muon Beam Cooling emittance, radiation, simulation, vacuum 266
 
  • R. P. Johnson, M. Popovic
    FNAL, Batavia, Illinois
  • M.M. Alsharo'a, R.E. Hartline, M. Kuchnir, T.J. Roberts
    Muons, Inc., Batavia
  • C. M. Ankenbrandt, A. Moretti
    Fermilab, Batavia, Illinois
  • K. Beard, A. Bogacz, Y.S. Derbenev
    Jefferson Lab, Newport News, Virginia
  • D. M. Kaplan, K. Yonehara
    IIT, Chicago, Illinois
  High intensity, low emittance muon beams are needed for new applications such as muon colliders and neutrino factories based on muon storage rings. Ionization cooling, where muon energy is lost in a low-Z absorber and only the longitudinal component is regenerated using RF cavities, is presently the only known cooling technique that is fast enough to be effective in the short muon lifetime. RF cavities filled with high-pressure hydrogen gas bring two advantages to the ionization technique:
  1. the energy absorption and energy regeneration happen simultaneously rather than sequentially, and
  2. higher RF gradients and better cavity breakdown behavior are possible than in vacuum due to the Paschen effect.
These advantages and some disadvantages and risks will be discussed along with a description of the present and desired RF R&D efforts needed to make accelerators and colliders based on muon beams less futuristic. 		 
Transparencies
 
TU204 Effect of High Solenoidal Magnetic Fields on Breakdown Voltages of High Vacuum 805 MHz Cavities vacuum, linac, factory, background 271
 
  • A. Moretti, A.D. Bross, S. Geer, Z. Qian
    Fermilab, Batavia, Illinois
  • D.M. Errede
    University of Illinois at Urbana-Champaign, Urbana, Illinois
  • D. Li
    LBNL/AFR, Berkeley, California
  • J. Norem
    ANL, Argonne, Illinois
  • R.A. Rimmer
    Jefferson Lab, Newport News, Virginia
  • Y. Torun
    IIT, Chicago, Illinois
  • M.S. Zisman
    LBNL, Berkeley, California
  The demonstration of muon ionization cooling by a large factor is necessary to demonstrate the feasilibility of a collider or neutrino factory. An important cooling experiment, MICE [1], has been proposed to demonstrate 10 % cooling which will validate the technology. Ionization cooling is accomplished by passing a high-emittance beam in a multi-Tesla solenoidal channel alternately through regions of low Z material and very high accelerating RF Cavities. To determine the effect of very large solenoidal magnetic fields on the generations of Dark current, X-Rays and breakdown Voltage gradients of vacuum RF cavities, a test facility has been established at Fermilab in Lab G. This facility consists of a 12 MW 805 MHz RF station, and a large bore 5 T solenoidal superconducting magnet containing a pill box type Cavity with thin removable window apertures allowing dark current studies and breakdown studies of different materials. The results of this study will be presented. The study has shown that the peak achievable accelerating gradient is reduced by almost a factor two in a 4 T field.

[1] http://mice.iit.edu/.

 
Transparencies
 
TUP41 Multi-Bunch Beam Dynamics Studies for the European XFEL emittance, linac, simulation, electron 357
 
  • N. Baboi
    DESY, Hamburg
  In the X-ray free electron laser planned to be built at DESY (TESLA XFEL) the acceleration of the electron bunches will be made with 9-cell superconducting cavities. These cavities have been initially developed within the TESLA linear collider study. The impact of the higher order modes (HOM) has been shown to be within the acceptable beam dynamics limits for the collider. For the XFEL the dynamics is relaxed from point of view of multi-bunch effects (e.g. shorter length, higher emittance). However the lower energy and different time structure of the beam make the study of the HOM effects in the XFEL linac necessary. Multi-bunch beam dynamics studies are ongoing. The results of the HOM measurements at the TESLA Test Facility are used. Several options for the beam structure, as necessary for various applications, are studied. The results will be discussed.  
Transparencies
 
TUP81 Superstrong Adjustable Permanent Magnet for a Linear Collider Final Focus permanent-magnet, linear-collider, quadrupole, multipole 462
 
  • Y. Iwashita, T. Mihara
    Kyoto ICR, Kyoto
  • A. Evgeny, M. Kumada
    NIRS, Chiba-shi
  • C. M. Spencer
    SLAC, Menlo Park, California
  • E. Sugiyama
    NEOMAX, Osaka
  Super-strong permanent magnets are being considered as one of the candidates for the final focus quadrupole magnets in a linear collider. A short prototype with temperature compensation included and variable strength capability has been designed and fabricated. Fabrication details and some magnetic measurement results will be presented.  
Transparencies
 
TUP88 CLIC Magnet Stabilization Studies quadrupole, linac, luminosity, site 483
 
  • S. Redaelli, R.W. Assmann, W. Coosemans, G. Guignard, D. Schulte, I. Wilson, F. Zimmermann
    CERN, Geneva
  One of the main challenges for future linear colliders is producing and colliding high energy e+e- beams with transverse spot sizes at the collision point in the nanometre range. Preserving small emittances along several kilometres of linac requires the lattice quadrupoles to be stable to the nanometre level. Even tighter requirements are imposed on the stability of the final focus quadrupoles, which have to be stable to a fraction of the colliding beam size to reliably steer the opposing beams in collision. The Compact LInear Collider (CLIC), presently under investigation at CERN, aims at colliding e+e- beams with a vertical spot size of 0.7 nm, at a centre-of-mass energy of 3 TeV. This requires a vertical stability to the 1.3 nm level for the 2600 linac quadrupoles and to the 0.2 nm level for the two final focus quadrupoles. The CLIC Stability Study has demonstrated for the first time that CLIC prototype quadrupoles can be stabilized to the 0.5 nm level in a normal working area on the CERN site. Detailed tracking simulations show that with this level of stability, approximately 70% of the CLIC design luminosity would be achieved. This paper summarizes the work and the achievements of the CLIC Stability Study.  
Transparencies
 
TUP91 Compact Electron-Linac Design Concept for a Gamma Ray Source linac, klystron, electron, linear-collider 492
 
  • K. C. D. Chan, B.E. Carlsten, G. Dale, R. Garnett, C. Kirbie, F.L. Krawczyk, S.J. Russell, T.P. Wangler
    LANL, Los Alamos, New Mexico
  • E. Wright
    CPI, Palo Alto, California
  Gamma-ray sources, particularly sources that are easily transportable, are in high demand for different homeland security applications. We have carried out a review of commercially available electron-linac-based sources, and have investigated alternative compact electron-linac systems that use updated technologies compared with sources that are available commercially. As the results, we propose to develop a new source using an electron linac operating at 17 GHz. It uses a klystron, instead of a magnetron, and a IGBT-switched HV power supply. The source design takes advantages of the advances in X-band linac technology and solid-state HV technology. The higher frequency and upgraded technologies offer smaller size, lighter weight, better efficiency, easier operation, and higher reliability, compared with commercially-available linacs. In this paper, we will describe the source design and our choice of technologies.  
 
TUP95 Evaluation of Magnetic Field Enhancement Along a Boundary dipole, linac, linear-collider, simulation 501
 
  • Y. Iwashita
    Kyoto ICR, Kyoto
  • T. Higo
    KEK, Ibaraki
  Generally, a cavity has convex corners on its inner surface, where the surface field becomes higher than the average accelerating gradient. This effect has been paid attention not to exceed a criterion only on surfaces that have high electric field gradient. A high magnetic field area, however, sometimes seems harmful on a stable operation too. Such enhancement factors are evaluated in a 2D model to show a feasible crossing angle limit on a convex angle of two surfaces.  
 
WE101 Gradient Limitations for High-Frequency Accelerators linear-collider, plasma, linac, vacuum 513
 
  • S. Döbert
    SLAC, Stanford
  While the physics of gradient limitations in high frequency rf accelerators still lacks a full theoretical understanding, a fairly complete empirical picture has emerged from the experimental work done in the past few years to characterize this phenomenon.Experimental results obtained mostly in the framework of the NLC/GLC project at 11 GHz and from the CLIC study at 30 GHz will be used to illustrate the important trends.The dependence of achievable gradient on pulse length, operating frequency and fabrication materials will be described. Also, the performance results most relevant to linear colliders will be presented in some detail. Specifically, these relate to the requirements that the structures sustain a certain gradient without incurring damaged, and that more importantly, they run reliably at this gradient, with breakdown rates less one in a million pulses. Finally interesting observations concerning the dynamics of breakdowns like spatial and temporal correlations and dark currents will be covered briefly, including the insights they provide into the breakdown mechanism.  
Transparencies
 
THP34 A High-Power Test of an X-Band Molybdenum-Iris Structure vacuum, klystron, linear-collider, linac 678
 
  • W. Wuensch, A. Grudiev, T. Heikkinen, I. Syratchev, T. Taborelli, I. Wilson
    CERN, Geneva
  • C. Adolphsen
    SLAC/NLC, Menlo Park, California
  • S. Döbert
    SLAC, Stanford
  In order to achieve accelerating gradients above 150 MV/m, alternative materials to copper are being investigated by the CLIC study. The potential of refractory metals has already been demonstrated in tests in which a tungsten-iris and a molybdenum-iris structure reached 150 and 193 MV/m respectively (30 GHz and a pulse length of 15 ns). In order to extend the investigation to the pulse lengths required for a linear collider, a molybdenum-iris structure scaled to X-band was tested at the NLCTA. The structure conditioned to only 65 MV/m (100 ns pulse length) in the available testing time and much more slowly than is typical of a copper structure. However the structure showed no sign of saturation and a microscopic inspection of the rf surfaces corroborated that the structure was still at an early stage of conditioning. The X-band and 30 GHz results are compared and what has been learned about material quality, surface preparation and conditioning strategy is discussed.  
Transparencies
 
THP35 Development of a Non-Magnetic Inertial Sensor for Vibration Stabilization in a Linear Collider feedback, linear-collider, acceleration, damping 681
 
  • J. Frisch, A. Chang, V. Decker, L. Hendrickson, T. Markiewicz, R. Partridge, A. Seryi
    SLAC, Menlo Park, California
  • D. Eric, T. Himel
    SLAC/NLC, Menlo Park, California
  One of the options for controlling vibration of the final focus magnets in a linear collider is to use active feedback based on accelerometers. While commercial geophysics sensors have noise performance that substantially exceeds the requirements for a linear collider, they are physically large, and cannot operate in the strong magnetic field of the detector. Conventional nonmagnetic sensors have excessive noise for this application. We report on the development of a non-magnetic inertial sensor, and on a novel commercial sensor both of which have demonstrated the required noise levels for this application.  
Transparencies
 
THP36 Vibration Stabilization of a Mechanical Model of a X-Band Linear Collider Final Focus Magnet feedback, resonance, linear-collider, site 684
 
  • J. Frisch, A. Chang, V. Decker, L. Hendrickson, T. Markiewicz, R. Partridge, A. Seryi
    SLAC, Menlo Park, California
  • E. Eric, L. Eriksson, T. Himel
    SLAC/NLC, Menlo Park, California
  The small beam sizes at the interaction point of a X-band linear collider require mechanical stabilization of the final focus magnets at the nanometer level. While passive systems provide adequate performance at many potential sites, active mechanical stabilization is useful if the natural or cultural ground vibration is higher than expected. A mechanical model of a room temperature linear collider final focus magnet has been constructed and actively stabilized with an accelerometer based system.  
 
THP59 Low Level RF Including a Sophisticated Phase Control System for CTF3 klystron, linac, linear-collider, beam-loading 748
 
  • J. Mourier, R. Bossart, J. Nonglaton, I. Syratchev, L. Tanner
    CERN, Geneva
  CTF3 (CLIC Test Facility 3), currently under construction at CERN, is a test facility designed to demonstrate the key feasibility issues of the CLIC (Compact LInear Collider) two-beam scheme. When completed, this facility will consist of a 150 MeV linac followed by two rings for bunch-interleaving, and a test stand where 30 GHz power will be generated. In this paper, the work that has been carried out on the linac’s low power RF system is described. This includes, in particular, a sophisticated phase control system for the RF pulse compressor to produce a flat-top rectangular pulse over 1.4 μs.  
 
THP60 High-Power RF Distribution System for the 8-Pack Project linear-collider, diagnostics, vacuum, resonance 751
 
  • C.D. Nantista
    SLAC/ARDB, Menlo Park, California
  • D.P. Atkinson
    LLNL, Livermore
  • J.Q. Chan
    SLAC/NLC, Menlo Park, California
  • S.Y. Kazakov
    KEK, Ibaraki
  • D.C. Schultz
    SLAC, Menlo Park, California
  • S.G. Tantawi
    SLAC/ARDA, Menlo Park, California
  The 8-Pack Project at SLAC is a prototype rf system whose goal is to demonstrate the high-power X-band technology developed in the NLC/GLC program. In its first phase, it has reliably produced a 400 ns rf pulse of over 500 MW using a solid-state modulator, four 11.424 GHz klystrons and a dual-moded SLED-II pulse compressor [1]. In Phase 2, the output power of our system has been delivered into the bunker of the NLCTA (Next Linear Collider Test Accelerator) and divided between several accelerating structures, first four and finally eight, for beam acceleration. We describe here the design, cold-test measurements, and processing of this power distribution system. Due to the high power levels and the need for efficiency, overmoded waveguide and components are used. For power transport, the TE 01 mode is used in 7.44 cm and 4.064 cm diameter circular waveguide. Only near the structures is standard WR90 rectangular waveguide employed. Components used to manipulate the rf power include transitional tapers, mode converters, overmoded bends, fractional directional couplers, and hybrids.

[1] S. Tantawi, et al., “Status of High-Power Tests of the Dual-Mode SLED-II System for an X-Band Linear Collider,” FR202, these proceedings.

 
 
THP67 Traveling Wave and Standing Wave Single Cell High Gradient Tests vacuum, coupling, linear-collider, simulation 766
 
  • V.A. Dolgashev
    SLAC/ARDB, Menlo Park, California
  • Y. Higashi, T. Higo
    KEK, Ibaraki
  • C.D. Nantista, S.G. Tantawi
    SLAC/ARDA, Menlo Park, California
  Accelerating gradient is one of the crucial parameters affecting design, construction and cost of next-generation linear accelerators. Operating accelerating gradient in normal conducting accelerating structures is limited by rf breakdown. In this paper we describe an experimental setup for study of these limits for 11.4 GHz traveling-wave and standing-wave accelerating structures. The setup uses matched mode converters that launch the circular TM01 mode and short test structures. The test structures are designed so that the electromagnetic fields in one cell mimic the fields in prototype structures for the Next Linear Collider. Fields elsewhere in the test structures and in the mode converters are significantly lower then in this single cell. This setup allows economic testing of different cell geometries, cell materials and preparation techniques with short turn around time. In this paper we present design considerations and initial experimental data.  
 
THP83 Measurements of High Order Modes in High Phase Advance Damped Detuned Accelerating Structure for NLC dipole, linear-collider, coupling, controls 791
 
  • N. Khabiboulline, T. Arkan, H. Carter
    FNAL, Batavia, Illinois
  • G. Linder
    University of Illinois at Urbana-Champaign, Urbana, Illinois
  • G. Romanov
    Fermilab, Batavia, Illinois
  The RF Technology Development group at Fermilab is working together with the NLC and JLC groups at SLAC and KEK on developing technology for room temperature X-band accelerating structures for a future linear collider. We have built several series of structures for high gradient tests. We have also built 150° phase advance per cell, 60 cm long, damped and detuned structures (HDDS or FXC series). Some of these structures will be used for the 8-pack test at SLAC by the end of 2004, as part of the JLC/NLC effort to demonstrate the readiness of room temperature RF technology for a linear collider. HDSS structures are very close to the final design for the linear collider, and it was very interesting to study the properties of high order modes in the structures produced by semi-industrial methods. In this study advanced RF technique and methods developed at Fermilab for structure low power testing and tuning have been used. The results of these measurements are presented in this paper.  
 
THP85 Test Results of the 3.9 GHz Cavity at Fermilab damping, coupling, emittance, linear-collider 797
 
  • N. Solyak, I. Gonin
    Fermilab, Batavia, Illinois
  • L. Bellantoni, T. Berenc, H. Edwards, M. Foley, N. Khabiboulline, D. Mitchell, A. Rowe
    FNAL, Batavia, Illinois
  Fermilab is developing two types of 3.9 GHz superconducting cavities to improve performances of A0 and TTF photoinjectors. In frame of this project we have built and tested two nine-cell copper models and one 3-cell niobium accelertating cavity and series of deflecting cavities. Properties of the high order modes were carefully studied in a chain of two copper cavities at room temperature. High gradient performance were tested at helium temperature. Achieved gradients and surface resistances are exceed goal parameters. In paper we discuss results of cold tests of the 3-cell accelerating and deflecting cavities.  
 
FR101 Overview of Linear Collider Test Facilities and Results emittance, linac, linear-collider, damping 827
 
  • H. Hayano
    KEK, Ibaraki
  Linear Collider technology will be recommended by the International Technology Recommendation Panel (ITRP) to the International Linear Collider Steering Committee (ILCSC), soon. Towards this recommendation, many efforts of the developments and the output results of each technology have been made to satisfy the requirements of the technical review committee report (TRC). The test facilities of each linear collider design are the place of the key technology demonstration and realization. The overview of the LC test facilities activities and outputs of TTF, NLCTA, ATF/GLCTA and CTF are summarized and reviewed.  
Transparencies
 
FR102 Muon Ionization Cooling Experiment (MICE) emittance, factory, simulation, focusing 832
 
  • M.S. Zisman
    LBNL, Berkeley, California
  There is presently considerable activity worldwide on developing the technical capability for a “neutrino factory” based on a muon storage ring and, a muon collider. Muons are obtained from the decay of pions produced when an intense proton beam hits a high-Z target, so the initial muon beam has a large 6-dimensional phase space. To increase the muons’ phase-space density, we use ionization cooling, which is based on energy loss in an absorber, followed by re-acceleration with high-gradient, normal-conducting RF cavities. The absorber of choice is liquid hydrogen to minimize multiple scattering. A superimposed solenoidal focusing channel contains the muons. Although the physics is straightforward, the technology and its implementation are not. The international MICE collaboration will demonstrate ionization cooling of a muon beam in a short section of a typical cooling channel. The experiment is approved for operation at Rutherford Appleton Lab. We will measure the cooling effects of various absorber materials at various initial emittance values using single-particle counting techniques. The experiment layout and goals will be discussed, along with the status of component R&D.  
Transparencies
 
FR201 Accelerator Control and Global Networks - State of the Art controls, feedback, linear-collider, linac 847
 
  • D.P. Gurd
    ORNL, Oak Ridge
  As accelerators increase in size and complexity, demands upon their control systems increase correspondingly. Machine complexity is reflected in complexity of control system hardware and software and careful configuration management is essential. Model-based procedures and fast feedback based upon even faster beam instrumentation are often required. Managing machine protection systems with tens of thousands of inputs is another significant challenge. Increased use of commodity hardware and software introduces new issues of security and control. Large new facilities will increasingly be built by national (e.g. SNS) or international (e.g. a linear collider) collaborations. Building an integrated control system for an accelerator whose development is geographically widespread presents particular problems, not all of them technical. Recent discussions of a “Global Accelerator Network” include the possibility of multiple remote control rooms and no more night shifts. Based upon current experience, observable trends and rampant speculation, this paper looks at the issues and solutions-–-some real, some probable, and some pie-in-the-sky.

*Spallation Neutron Source, ORNL and LANL

 
Transparencies
 
FR202 Status of High-Power Tests of Dual Mode SLED-II System for an X-Band Linear Collider vacuum, linear-collider, linac, coupling 852
 
  • S.G. Tantawi
    SLAC/ARDA, Menlo Park, California
  • V.A. Dolgashev, C.D. Nantista
    SLAC/ARDB, Menlo Park, California
  We have produced 400 ns rf pulses of greater than 500 MW at 11.424 GHz with an rf system designed to demonstrate technology capable of powering a TeV scale electron-positron linear collider. Power is produced by four 50 MW X-band klystrons run off a common 400 kV solid-state modulator. We present the layout of our system, which includes a dual-moded transmission waveguide system and a dual-moded resonant-line (SLED-II) pulse compression system. Dual-moding of the transmission lines allows power to be directed through a pulse compression path or a bypass path; dual-moding in the pulse compressor allows the delay lines to be about half as long as they otherwise would need to be. We describe the design and performance of various components, including hybrids, directional couplers, power dividers, tapers, mode converters, and loads. These components are mostly overmoded to allow for greater power handling. We also present data on the processing and operation of this system. The power from that system is transported to feed a set accelerator structure. We will present the design and the high power testing data for the overmoded transfer line and the distribution network.  
Transparencies