Flower-petal mode converter for NLC

Hoag, H.A.; Tantawi, Sami; Callin, R.S.; Deruyter, H.; Farkas, Z.D.; Ko, K.; Kroll, N.; Lavine, T. L.; Menegat, A.; Vlieks, A.E.

doi:10.1109/pac.1993.308664

Cited by 15 publications

(8 citation statements)

References 2 publications

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“…7, and theoretical comments and a description of the experimental development is given in ref. 12. As shown there, the device has reasonable bandwidth, excellent mode purity, and with a matching post is well matched.…”

Section: Mode Transducersmentioning

confidence: 67%

Theoretical problems in accelerator physics. Progress report

Kroll¹

1993

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This is the first progress report subiifittcd under my current grant, lt covers progress made since the submission of the proposal, and therefore includes work carried out in completion of DOE contract AS03-89ER40527 as well as research carried out under the current grant. During this period I have continued to spend approximately one half of my time at SLAC and most of the projects reported here were carried out in collaboration with individuals and groups at SLAC. Except where otherwise noted, reference numbers in the text below refer to the attached list of current contract publications. Copies of the publications, numbered in agreement with the publication list, are included with this report. I. Radio Frequency Pulse Compression And Power Transport a) High Power Pulse Compression A high power vacuum tight version of SLED-II (prototype I) is currently undergoing test under high vacuum working up gradually towards high power. As of this writing input powers of 14 MW have been achieved at a pulse compression factor of eleven. The system has a window at its output end which ultimately must carry the full output power of the compressed pulse. Approximately two weeks of seasoning is required (in which the power is increased gradually) in order to avoid window rupture as the system is brought up to full power. Output power observed through the output window with the 14 MW input is approximately 64 MW (preliminary), corresponding to peak power enhancement by a factor 4.6. It is planned to use this system as the RF source for powering the Accelerator Structure Test Area (ASTA), and it will be needed in the very near future to test a 75 cm constant-gradient structure as discussed in ref. 11. The prototype I version of SLED-H incorporates the original 3dB coupler described in ref. 2 of the proposal. In order to incorporate it in a vacuum system it was disassembled for cleaning, reassembled, and mounted in a vacuum chamber. (The coupler was made in two halves bolted together, a procedure which made experiment based tuning possible, but not suitable for a vacuum system without the extra vacuum chamber). A new set of offset bends, which proved to be less satisfactory than the original ones, were used to permit a larger separation of the delay lines. The system incorporates two 33 foot delay lines in 2.81 in diameter circular waveguide. These were scavenged from the binary pulse compression system and are in less than pristine condition. The vacuum tight system has been fully tested at low power and the results are reported in ref. 10. Peak power multiplication by a factor 4.8 at 40% efficiency has been observed. This is somewhat above 10% poorer than would be expected from resistive losses and the inherent inefficiency of the SLED-II scheme alone, but is consistent with measured properties of the individual components. The "canned" hybrid with the new offset bends is at least twice as lossy as the original version. Factors to which this could be attributed are: (1) the effectiveness of the electrical ,'ontact associated wi...

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Section: Mode Transducersmentioning

confidence: 67%

Theoretical problems in accelerator physics. Progress report

Kroll¹

1993

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“…Delay-line quality (&) factors between 4.3 x lo5 and 1.0 x lo6 have been achieved [Tantawi 1995a, Tantawi 19961. Converting between the TEol circular-waveguide mode and the TE1o rectangular-waveguide mode has been performed by compact, flower-petal type, low-loss mode transducers (see below) [Lanciani 1953, Hoag 1993. Figure 8-23 shows the demonstrated performance of a prototype high-power SLED-I1 pulse compressor at SLAC.…”

Section: Performancementioning

confidence: 99%

“…Conversion between the TEol circular-waveguide mode and the TElo rectangular-waveguide mode will be performed by compact, flower-petal type, low-loss mode transducers [Lanciani 1953, Hoag 1993. Transducers of this type, shown in Figure 8-26 have been analyzed, measured, and used extensively at SLAC.…”

Section: Physical Layoutmentioning

confidence: 99%

Zeroth-order design report for the next linear collider. Volume 2

Raubenheimer¹

1996

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AcknowledgmentsThis design for the Next Linear Collider (NLC) relies heavily on the first h e a r collider-the Stanford Linear Collider (SLC)-and on all the people who proposed, designed, and commissioned this pioneering accelerator. Without their work, none of this would have been possible (or necessary). In addition, the design owes much to the extensive international research effort that is investigating the different technological paths to a future linear collider. Finally, the NLC Design Group is a list of people, authors and non-authors, who have contributed significantly to this design; our apology in advance to anyone whose name may have inadvertantly been omitted.In the process of completing this "Zeroth-Order Design" for the NLC, we have held two internal reviews and, more recently, an international external review. All of these have been very important to the design and we thank all of those who assisted. In particular, we thank the members of the external review panel which consisted of: Gerry Dugan, Helen Edwards, Hans J?rischholz, David Gurd, Tom Himel, Steve Holmes, Norbert Holtkamp, John Ives, Robert Jameson, Katsunobu Oide, Satoshi Ozaki, John Rees, Nobu Toge. A number of useful comments were made, some of which already have been incorporated into the design. Most members of the internal review committees are listed in the contributors list; additional useful suggestions were given by H. DeStaebler, J.T. Seeman PrefaceThis "Zeroth-Order Design Report" (ZDR) for the Next Linear Collider (NLC) is being created at a time of both great opportunity and uncertainty in the future directions that w i l l be taken by the world-wide community of high-energy physics. There is exciting news that the Large Hadron Collider project has been approved for construction at CERN, and the planned involvement by physicists and engineers from countries around the globe will make this the first accelerator to be designed and built by a truly world-wide collaboration. By contrast, the cancellation of the SSC has demonstrated the necessity of international collaboration on such large scientific projects. The community of scientists and engineers at work on the accelerator physics and technologies of high-energy electron-positron colliders has recognized this need, and has made concerted effort to coordinate research activities to optimize our combined understanding and knowledge. This ZDR is one further step in this process.The first electron-positron linear collider, the Stanford Linear Collider (SLC), began operation in 1989 with the dual purpose to explore the particle physics of the Zo boson and to develop the accelerator physics needed for a future TeV-scale linear collider. The SLC program has proven to be quite successful on both counts. Experiences gained and lessons learned from this prototype collider are a firm foundation for the design and implementation of a next generation machine. Developments at laboratories around the world have led to several choices of technologies to efficiently accelerate...

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“…However, there are few mode transducer design options like Marie mode transducer and flower petal mode-converter [6], [7 ]. Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed TEIO to TEo! flower-petal mode transducer [7] is a symmetrical device in which a rectangular waveguide is bifurcated--splitting the power into two identical waveguide feeds with each coupling to a cylindrical guide through a pair of coupling slots, but the main drawback of this transducer is its extremely narrow bandwidth and high insertion loss.…”

Section: Introductionmentioning

confidence: 99%

X-band all-waveguide radial combiner for high power applications

Kazemi

Hegazi²,

Fathy

2015

2015 IEEE MTT-S International Microwave Symposium

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The development of a 12-way X-band allwaveguide radial divider/combiner is presented. The radial combiner is comprised of three parts: a center feed, a radial line, and peripheral waveguide ports. The center feed is comprised of two sections: a rectangular waveguide section and a mode transducer section. The latter is a circular waveguide fed by four way in-phase combiner to convert the rectangular waveguide TEIO mode to a TEol circular waveguide mode for in-phase feeding of all peripheral ports. For design evaluation, the 12-way combiner was built and tested but also two back-to-back test fixtures, one for the mode transducer and the second for the radial combiner were fabricated and tested as well. The measured insertion loss and phase imbalance of the combiner over a 10% operating bandwidth are less than 0.35 dB and ±So, respectively. The structure is suitable for high power and should handle few kilo watts.Index Terms -Mode transducer, radial combiner, compact combiner, high power amplifiers, X band.

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Flower-petal mode converter for NLC

Cited by 15 publications

References 2 publications

Theoretical problems in accelerator physics. Progress report

Theoretical problems in accelerator physics. Progress report

Zeroth-order design report for the next linear collider. Volume 2

X-band all-waveguide radial combiner for high power applications

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