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Book HOM Free Linear Accelerator Structure Using Choke Mode Cavity

Download or read book HOM Free Linear Accelerator Structure Using Choke Mode Cavity written by Tsumoru Shintake and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book HOM Free Linear Accelerating Structure for E E Linear Collider at C Band

Download or read book HOM Free Linear Accelerating Structure for E E Linear Collider at C Band written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: HOM-free linear acceleration structure using the choke mode cavity (damped cavity) is now under design for e[sup+]e[sup -] linear collider project at C-band frequency (5712 MHz). Since this structure shows powerful damping effect on most of all HOMs, there is no multibunch problem due to long range wakefields. The structure will be equipped with the microwave absorbers in each cells and also the in-line dummy load in the last few cells. The straightness tolerance for 1.8 m long structure is closer than 30[micro]m for 25% emittance dilution limit, which can be achieved by standard machining and braising techniques. Since it has good vacuum pumping conductance through annular gaps in each cell, instabilities due to the interaction of beam with the residual-gas and ions can be minimized.

Book EPAC96

Download or read book EPAC96 written by S. Myers and published by . This book was released on 1996 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Distributed coupling Linear Particle Accelerators

Download or read book Distributed coupling Linear Particle Accelerators written by Mamdouh Hassan Nasr and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Linear particle accelerators (linacs) are essential for future discovery machines as well as many advanced medical and industrial applications. A linac is formed from a set of cascaded RF cavities (cells). For a typical electron linac, such as the SLAC linear accelerator, RF power is fed to the linac from one point and flows to adjacent cells through the beam tunnel. Consequently, the linac design process requires careful consideration of the coupling between adjacent cells. This limits the ability of the designer to optimize the cell shape for high RF-to-beam efficiency and/or craft the field on the surface for high-gradient operation. We introduce a novel particle accelerator technology that utilizes a periodic feeding network to feed every accelerating cell independently. This eliminates the need for the coupling between cells, giving considerable optimization flexibility for the shape of the accelerator cells. This dissertation discusses the concept behind this topology and presents how such a concept is developed and implemented through a set of key research milestones. The theory of the distributed-coupling linac is presented alongside the associated optimization techniques that take full benefit of the resultant design flexibility. Compared to a conventional linac, our designed and tested structures provide approximately double the shunt impedance. A novel manufacturing technique is enabled by observing that both the cells and the feeding network have planes with no currents passing through them. This allowed the manufacturing of the structure from two blocks. From an economical point of view, this reduces the part count by about two orders of magnitude in comparison to traditional ways of building the structures from half-cell cups. Additionally, this method allows us to assemble the structure without the necessary brazing steps typically needed for traditional linacs. Hence, the copper or doped-copper material hardness properties can be maintained, further enhancing the ability of the surface to resist damage due to cyclic fatigue. Cryogenic operation of normal-conducting linacs substantially reduces their surface resistance and hence improves RF-to-beam efficiency. The reduced losses also reduce the transient temperature rise on the surface, which is the root cause of the surface cyclic fatigue that leads to surface distortions and consequently breakdown events. That cyclic fatigue is further reduced because the copper yield strength is increased at lower temperatures. In this work, we present the first demonstration of high-gradient acceleration of an electron-beam at a cryogenic temperature of 77 K. Experimental operation of the distributed-coupling structure at 77 K resulted in a reduction in the breakdown rates by two orders of magnitude. Furthermore, the concept of distributed-coupling is extended to superconducting accelerators. Compared to conventional designs, the provided optimization flexibility of the distributed-coupling topology leads to optimized geometries with a reduced surface magnetic field and RF power loss. This reduction should allow for high-gradient operation and reduced system cost. We present our initial attempts to build and test a superconducting distributed-coupling linac. Finally, the concept of distributed-coupling is extended to utilize two accelerating modes that operate simultaneously in the same linac. Dual-mode acceleration enhances the shunt impedance while allowing the structure to operate at much higher gradients. The latter advantage is due to the fact that a given point on the cavity surface does not experience the sum of the peak fields from the two modes at the same time. An extra degree of freedom is obtained by not requiring the operating frequencies to be harmonically related; it is sufficient to have a common sub-harmonic. The value of this sub-harmonic determines the distance between the bunches that can be accelerated. The proposed dual-mode architecture prevents the leakage of the high-frequency mode through the coupling ports of the low-frequency mode by introducing a choke feature in the low-frequency port. Moreover, this architecture preserves the structure symmetry and allows for manufacturing the structure from quadrant copper blocks.

Book LIGA fabricated Compact Mm wave Linear Accelerator Cavities

Download or read book LIGA fabricated Compact Mm wave Linear Accelerator Cavities written by and published by . This book was released on 1998 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Millimeter-wave rf cavities for use in linear accelerators, free-electron lasers, and mm-wave undulatory are under development at Argonne National Laboratory. Typical cavity dimensions are in the 1000 mm range, and the overall length of the accelerator structure, which consists of 30-100 cavities, is about 50-100 mm. An accuracy of 0.2% in the cavity dimensions is necessary in order to achieve a high Q-factor of the cavity. To achieve this these structures are being fabricated using deep X-ray lithography, electroforming, and assembly (LIGA). The first prototype cavity structures are designed for 108 GHz and 2p/3-mode operation. Input and output couplers are integrated with the cavity structures. The cavities are fabricated on copper substrates by electroforming copper into 1-mm-thick PMMA resists patterned by deep x-ray lithography and polishing the copper down to the desired thickness. These are fabricated separately and subsequently assembled with precision spacing and alignment using microspheres, optical fibers, or microfabricated spacers/alignment pieces. Details of the fabrication process, alignment, and assembly work are presented in here.

Book High Energy Physics Index

Download or read book High Energy Physics Index written by and published by . This book was released on 1992 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Commemorating The Past And Looking Towards The Future Ocpa 2000 Proceedings Of The Third Joint Meeting Of Chinese Physicists Worldwide

Download or read book Commemorating The Past And Looking Towards The Future Ocpa 2000 Proceedings Of The Third Joint Meeting Of Chinese Physicists Worldwide written by Ngee-pong Chang and published by World Scientific. This book was released on 2002-08-14 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is not just a conference proceedings covering the full spectrum of physics disciplines. It is also a historic retrospective on the past generation of giants in Chinese physics. It covers the historical tributes by Nobel Laureates Lee and Yang and others to the life and works of Professors Ta-You Wu, Chien-Shiung Wu and Xie Xi-de. In the words of the title in Chinese, as we drink the water let us ponder the source.

Book Commemorating the Past and Looking Towards the Future

Download or read book Commemorating the Past and Looking Towards the Future written by Ngee-pong Chang and published by World Scientific. This book was released on 2002 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is not just a conference proceedings covering the full spectrum of physics disciplines. It is also a historic retrospective on the past generation of giants in Chinese physics. It covers the historical tributes by Nobel Laureates Lee and Yang and others to the life and works of Professors Ta-You Wu, Chien-Shiung Wu and Xie Xi-de. In the words of the title in Chinese, as we drink the water let us ponder the source.

Book C band Choke Mode Accelerator Structure for the Linear Collider

Download or read book C band Choke Mode Accelerator Structure for the Linear Collider written by H. Matsumoto and published by . This book was released on 1996 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Multi Mode Cavity Accelerator Structure

Download or read book Multi Mode Cavity Accelerator Structure written by and published by . This book was released on 2016 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project aimed to develop a prototype for a novel accelerator structure comprising coupled cavities that are tuned to support modes with harmonically-related eigenfrequencies, with the goal of reaching an acceleration gradient>200 MeV/m and a breakdown rate

Book Proceedings

Download or read book Proceedings written by and published by . This book was released on 1995 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Design and Construction of Planar Mm wave Accelerating Cavity Structures

Download or read book Design and Construction of Planar Mm wave Accelerating Cavity Structures written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Feasibility studies on the planar millimeter-wave cavity structures have been made. The structures could be used for linear accelerators, free electron lasers, mm-wave amplifiers, or mm-wave undulators. The cavity structures are intended to be manufactured by using DXL (deep x-ray lithography) microfabrication technology. The frequency of operation can be about 30GHz to 300GHz. For most applications, a complete structure consists of two identical planar half structures put together face-to-face. Construction and properties of constant gradient structures that have been investigated so far will be discussed. These cavity structures have been designed for 120GHz 2[pi]/3-mode operation.