PAC2013 - List of Authors (O'Shea, F.H.)

Paper	Title	Page
MOPHO25	Removal of Residual Chirp in Compressed Beams Using a Passive Wakefield Technique	291
	M.A. Harrison, G. Andonian, T.J. Campese, P. Frigola, A.Y. Murokh, F.H. O'Shea, M. Ruelas RadiaBeam, Santa Monica, USA M.G. Fedurin BNL, Upton, Long Island, New York, USA
	Funding: This is experiment is supported by an ongoing DOE Phase I Small Business Initiative for Research (SBIR) Grant, number DE–-SC0009550. The removal of residual chirp in XFELs is of paramount importance for efficient lasing. Although current S-band XFELs remove the unwanted residual chirp using off-crest acceleration after the final bunch compressor, this technique is not possible for XFELs with soft X-ray lines as there are no further accelerating structures. The off-crest dechirping technique is also expensive for future superconducting XFELs. In response, RadiaBeam Systems presents its work, building upon the theoretical work of Bane and Stupakov, in RF-free residual chirp mitigation using only passive techniques. Beam-induced longitudinal wakefields are produced with opposing corrugated plates which allow for an entirely RF-free chirp removal. Theory, engineering, and experimental results are presented. K.L.F. Bane, G. Stupakov, Nucl. Inst. Meth. 690 (2012) 106-110

WEPBA17	Measurement of Non-Linear Insert Magnets	922
	F.H. O'Shea, R.B. Agustsson, A.Y. Murokh, E. Spranza RadiaBeam, Marina del Rey, USA S. Nagaitsev, A. Valishev Fermilab, Batavia, USA
	Fermilab's Integrable Optics Test Accelerator (IOTA) is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. In this report we describe the contribution of RadiaBeam Technologies to the IOTA project which includes nonlinear magnet engineering, production and measurement.

THPAC36	Progress in the Development of Textured Dysprosium for Undulator Applications	1217
	F.H. O'Shea UCLA, Los Angeles, California, USA R.B. Agustsson, Y.C. Chen, T.J. Grandsaert, A.Y. Murokh, K.E. Woods RadiaBeam, Santa Monica, USA J. Park, R.L. Stillwell NHMFL, Tallahassee, Florida, USA
	RadiaBeam Technologies is in the process of developing bulk textured dysprosium as a potential replacement for CoFe steel as undulator poles. For cryogenic undulators that can be cooled below the ferromagnetic transition of dysprosium, textured dysprosium offers potential increase in the peak field of the undulator. Here we report on the progress of the project, including magnetization curves for the material and simulations of a short period undulator utilizing the material.

Paper

Title

Page

Removal of Residual Chirp in Compressed Beams Using a Passive Wakefield Technique

291

M.A. Harrison, G. Andonian, T.J. Campese, P. Frigola, A.Y. Murokh, F.H. O'Shea, M. Ruelas
RadiaBeam, Santa Monica, USA
M.G. Fedurin
BNL, Upton, Long Island, New York, USA

Funding: This is experiment is supported by an ongoing DOE Phase I Small Business Initiative for Research (SBIR) Grant, number DE–-SC0009550.
The removal of residual chirp in XFELs is of paramount importance for efficient lasing. Although current S-band XFELs remove the unwanted residual chirp using off-crest acceleration after the final bunch compressor, this technique is not possible for XFELs with soft X-ray lines as there are no further accelerating structures. The off-crest dechirping technique is also expensive for future superconducting XFELs. In response, RadiaBeam Systems presents its work, building upon the theoretical work of Bane and Stupakov*, in RF-free residual chirp mitigation using only passive techniques. Beam-induced longitudinal wakefields are produced with opposing corrugated plates which allow for an entirely RF-free chirp removal. Theory, engineering, and experimental results are presented.
* K.L.F. Bane, G. Stupakov, Nucl. Inst. Meth. 690 (2012) 106-110

WEPBA17

Measurement of Non-Linear Insert Magnets

922

F.H. O'Shea, R.B. Agustsson, A.Y. Murokh, E. Spranza
RadiaBeam, Marina del Rey, USA
S. Nagaitsev, A. Valishev
Fermilab, Batavia, USA

Fermilab's Integrable Optics Test Accelerator (IOTA) is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. In this report we describe the contribution of RadiaBeam Technologies to the IOTA project which includes nonlinear magnet engineering, production and measurement.

THPAC36

Progress in the Development of Textured Dysprosium for Undulator Applications

1217

F.H. O'Shea
UCLA, Los Angeles, California, USA
R.B. Agustsson, Y.C. Chen, T.J. Grandsaert, A.Y. Murokh, K.E. Woods
RadiaBeam, Santa Monica, USA
J. Park, R.L. Stillwell
NHMFL, Tallahassee, Florida, USA

RadiaBeam Technologies is in the process of developing bulk textured dysprosium as a potential replacement for CoFe steel as undulator poles. For cryogenic undulators that can be cooled below the ferromagnetic transition of dysprosium, textured dysprosium offers potential increase in the peak field of the undulator. Here we report on the progress of the project, including magnetization curves for the material and simulations of a short period undulator utilizing the material.