FEL2013 - List of Authors (Jing, Y.C.)

Paper

Title

Page

Broad-band Amplifier Based on Two-stream Instability

144

G. Wang, Y.C. Jing, V. Litvinenko
BNL, Upton, Long Island, New York, USA

A broadband FEL amplifier is of great interests for short-pulse generation in FEL technology as well as for novel hadron beam cooling technique, such as CeC. We present our founding of a broadband amplification in 1D FEL based on electron beam with two energy peaks and a strong space charge forces. We present the optimization of such amplifier and connect its origin to the two-stream instability in electron plasma. In this work, we study how the two-stream instability affects the FEL process and consider various applications in amplifying short spikes of electron current modulation.

WEOCNO01

Simulation Studies of FEL Green Function and Its Saturation

Y.C. Jing, Y. Hao, V. Litvinenko, G. Wang
BNL, Upton, Long Island, New York, USA

FEL amplifiers can be used for a number of applications ranging from the HGHG [1] , the coherent seed amplifying [2] or amplifier in Coherent electron Cooler [3]. Linear response of an FEL amplifier can be described using its Green function. In this paper we present results of detailed studies of the evolution and saturation of the Green function in FEL as function of its length. We are using time resolved mode of the code Genesis [4] for these studies, which include delta-function like seed and shot noise in electron beam. We simulate a statistically representative set of initial shot noise with and without the seed, and extract the Green function amplitude and phase evolution, as well as their fluctuation. We present results for three spectral ranges: the IR, the visible and the soft X-rays. We summarize our finding and compare them with a simple theoretical formula.
[1] L.H. Yu et al., science, 289 (2000)
[2] J. Feldhaus et al., NIMA, 1997
[3] V. N. Litvinenko et al., Phys. Rev. Lett. 102, 114801 (2009)
[4] S.Reiche, Genesis 2.0

Slides WEOCNO01 [0.479 MB]

WEPSO31

THz Radiation Source Potential of the R&D ERL at BNL

566

D. Kayran, I. Ben-Zvi, Y.C. Jing, B. Sheehy
BNL, Upton, Long Island, New York, USA

Funding: Work supported by BSA DOE, Contract No. DE-AC02-98CH10886
An ampere class 20 MeV superconducting Energy Recovery Linac (ERL) is under commissioning at Brookhaven National Laboratory (BNL) for testing concepts for high-energy electron cooling and electron-ion colliders. This ERL will be used as a test bed to study issues relevant for very high current ERLs. High repetition rate (9.5 MHz), CW operation and high performance of electron beam with some additional components make this ERL an excellent driver for high power coherent THz radiation source*. We discuss potential use of BNL ERL as a source of THz radiation and results of the beam dynamics simulation. We present the status and commissioning progress of the ERL.
*Ilan Ben-Zvi. et al. Coherent harmonic generation of THz radiation using wakefield bunching (presented at this conference)

Paper	Title	Page
MOPSO81	Broad-band Amplifier Based on Two-stream Instability	144
	G. Wang, Y.C. Jing, V. Litvinenko BNL, Upton, Long Island, New York, USA
	A broadband FEL amplifier is of great interests for short-pulse generation in FEL technology as well as for novel hadron beam cooling technique, such as CeC. We present our founding of a broadband amplification in 1D FEL based on electron beam with two energy peaks and a strong space charge forces. We present the optimization of such amplifier and connect its origin to the two-stream instability in electron plasma. In this work, we study how the two-stream instability affects the FEL process and consider various applications in amplifying short spikes of electron current modulation.

WEOCNO01	Simulation Studies of FEL Green Function and Its Saturation
	Y.C. Jing, Y. Hao, V. Litvinenko, G. Wang BNL, Upton, Long Island, New York, USA
	FEL amplifiers can be used for a number of applications ranging from the HGHG [1] , the coherent seed amplifying [2] or amplifier in Coherent electron Cooler [3]. Linear response of an FEL amplifier can be described using its Green function. In this paper we present results of detailed studies of the evolution and saturation of the Green function in FEL as function of its length. We are using time resolved mode of the code Genesis [4] for these studies, which include delta-function like seed and shot noise in electron beam. We simulate a statistically representative set of initial shot noise with and without the seed, and extract the Green function amplitude and phase evolution, as well as their fluctuation. We present results for three spectral ranges: the IR, the visible and the soft X-rays. We summarize our finding and compare them with a simple theoretical formula. [1] L.H. Yu et al., science, 289 (2000) [2] J. Feldhaus et al., NIMA, 1997 [3] V. N. Litvinenko et al., Phys. Rev. Lett. 102, 114801 (2009) [4] S.Reiche, Genesis 2.0
	Slides WEOCNO01 [0.479 MB]

WEPSO31	THz Radiation Source Potential of the R&D ERL at BNL	566
	D. Kayran, I. Ben-Zvi, Y.C. Jing, B. Sheehy BNL, Upton, Long Island, New York, USA
	Funding: Work supported by BSA DOE, Contract No. DE-AC02-98CH10886 An ampere class 20 MeV superconducting Energy Recovery Linac (ERL) is under commissioning at Brookhaven National Laboratory (BNL) for testing concepts for high-energy electron cooling and electron-ion colliders. This ERL will be used as a test bed to study issues relevant for very high current ERLs. High repetition rate (9.5 MHz), CW operation and high performance of electron beam with some additional components make this ERL an excellent driver for high power coherent THz radiation source. We discuss potential use of BNL ERL as a source of THz radiation and results of the beam dynamics simulation. We present the status and commissioning progress of the ERL. Ilan Ben-Zvi. et al. Coherent harmonic generation of THz radiation using wakefield bunching (presented at this conference)