LINAC2016 - List of Authors (Dolgashev, V.A.)

Paper	Title	Page
MOOP04	Traveling Wave Linear Accelerator With RF Power Flow Outside of Accelerating Cavities	48
MOPRC030	use link to see paper's listing under its alternate paper code
	V.A. Dolgashev SLAC, Menlo Park, California, USA
	Funding: Work supported by the U.S. DOE under Contract No. DE-AC02-76-SF00515. An accelerating structure is a critical component of particle accelerators for medical, security, industrial and scientific applications. Standing-wave side-coupled accelerating structures are used where available RF power is at a premium, while average current and average RF power lost in the structure are high. These structures are expensive to manufacture and typically require a circulator to divert structure-reflected power away from RF source, klystron or magnetron. In this report a traveling wave accelerating structure is presented which combines high shunt impedance of the side-coupled standing wave structure with such advantages as simpler tuning and manufacturing. In addition, the structure is matched to the RF source so no circulator is needed. This paper presents the motivation for this structure and shows a practical example.
	Slides MOOP04 [5.459 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP04
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MOPLR065	High-Gradient X-band Structures for Proton Energy Booster at LANSCE	280
	S.S. Kurennoy, L. Rybarcyk LANL, Los Alamos, New Mexico, USA V.A. Dolgashev SLAC, Menlo Park, California, USA
	Increasing energy of proton beam at LANSCE from 800 MeV to 3 GeV improves radiography resolution ~10 times. Using superconducting RF cavities with gradients ~15 MV/m after the existing linac would result in a long and expensive booster. We propose accomplishing the same with a much shorter cost-effective booster based on normal conducting high-gradient (~100 MV/m) RF accelerating structures. Such X-band high-gradient structures have been developed for electron acceleration and operate with typical RF pulse lengths below 1 us. They have never been used for protons because typical wavelengths and apertures are smaller than the proton bunch sizes. However, these limitations do not restrict proton radiography (pRad) applications. A train of very short proton bunches with the same total length and charge as the original long proton bunch will create the same single radiography frame, plus pRad limits contiguous trains of beam micro-pulses to below 60 ns to prevent blur in images. For a compact pRad booster at LANSCE, we explore feasibility of two-stage design: a short S-band section to capture and compress the 800-MeV proton beam followed by the main high-gradient X-band linac.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR065
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THPLR003	Fabrication and High-Gradient Testing of an Accelerating Structure Made From Milled Halves	845
	W. Wuensch, T. Argyropoulos, N. Catalán Lasheras, D. Esperante Pereira, J. Giner Navarro, A. Grudiev, G. McMonagle, I. Syratchev, B.J. Woolley, H. Zha CERN, Geneva, Switzerland T. Argyropoulos, D. Esperante Pereira, J. Giner Navarro IFIC, Valencia, Spain G.B. Bowden, V.A. Dolgashev, A.A. Haase SLAC, Menlo Park, California, USA P.J. Giansiracusa, T.G. Lucas, M. Volpi The University of Melbourne, Melbourne, Victoria, Australia R. Rajamaki Aalto University, School of Science and Technology, Aalto, Finland X.F.D. Stragier TUE, Eindhoven, The Netherlands
	Accelerating structures made from parts which follow symmetry planes offer many potential advantages over traditional disk-based structures: more options for joining (from bonding to welding), following this more options for material state (heat treated or not) and potentially lower cost since structures can be made from fewer parts. An X-band structure made from milled halves, and with a standard benchmarked CLIC test structure design has been fabricated and high-gradient tested in the range of 100 MV/m.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR003
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

MOOP04

Traveling Wave Linear Accelerator With RF Power Flow Outside of Accelerating Cavities

48

MOPRC030

use link to see paper's listing under its alternate paper code

V.A. Dolgashev
SLAC, Menlo Park, California, USA

Funding: Work supported by the U.S. DOE under Contract No. DE-AC02-76-SF00515.
An accelerating structure is a critical component of particle accelerators for medical, security, industrial and scientific applications. Standing-wave side-coupled accelerating structures are used where available RF power is at a premium, while average current and average RF power lost in the structure are high. These structures are expensive to manufacture and typically require a circulator to divert structure-reflected power away from RF source, klystron or magnetron. In this report a traveling wave accelerating structure is presented which combines high shunt impedance of the side-coupled standing wave structure with such advantages as simpler tuning and manufacturing. In addition, the structure is matched to the RF source so no circulator is needed. This paper presents the motivation for this structure and shows a practical example.

Slides MOOP04 [5.459 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP04

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPLR065

High-Gradient X-band Structures for Proton Energy Booster at LANSCE

280

S.S. Kurennoy, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA
V.A. Dolgashev
SLAC, Menlo Park, California, USA

Increasing energy of proton beam at LANSCE from 800 MeV to 3 GeV improves radiography resolution ~10 times. Using superconducting RF cavities with gradients ~15 MV/m after the existing linac would result in a long and expensive booster. We propose accomplishing the same with a much shorter cost-effective booster based on normal conducting high-gradient (~100 MV/m) RF accelerating structures. Such X-band high-gradient structures have been developed for electron acceleration and operate with typical RF pulse lengths below 1 us. They have never been used for protons because typical wavelengths and apertures are smaller than the proton bunch sizes. However, these limitations do not restrict proton radiography (pRad) applications. A train of very short proton bunches with the same total length and charge as the original long proton bunch will create the same single radiography frame, plus pRad limits contiguous trains of beam micro-pulses to below 60 ns to prevent blur in images. For a compact pRad booster at LANSCE, we explore feasibility of two-stage design: a short S-band section to capture and compress the 800-MeV proton beam followed by the main high-gradient X-band linac.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR065

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPLR003

Fabrication and High-Gradient Testing of an Accelerating Structure Made From Milled Halves

845

W. Wuensch, T. Argyropoulos, N. Catalán Lasheras, D. Esperante Pereira, J. Giner Navarro, A. Grudiev, G. McMonagle, I. Syratchev, B.J. Woolley, H. Zha
CERN, Geneva, Switzerland
T. Argyropoulos, D. Esperante Pereira, J. Giner Navarro
IFIC, Valencia, Spain
G.B. Bowden, V.A. Dolgashev, A.A. Haase
SLAC, Menlo Park, California, USA
P.J. Giansiracusa, T.G. Lucas, M. Volpi
The University of Melbourne, Melbourne, Victoria, Australia
R. Rajamaki
Aalto University, School of Science and Technology, Aalto, Finland
X.F.D. Stragier
TUE, Eindhoven, The Netherlands

Accelerating structures made from parts which follow symmetry planes offer many potential advantages over traditional disk-based structures: more options for joining (from bonding to welding), following this more options for material state (heat treated or not) and potentially lower cost since structures can be made from fewer parts. An X-band structure made from milled halves, and with a standard benchmarked CLIC test structure design has been fabricated and high-gradient tested in the range of 100 MV/m.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR003

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)