PAC2013 - List of Authors (Nakamura, K.)

Paper

Title

Page

BELLA Laser and Operations

1097

W. Leemans, J. Daniels, A. Deshmukh, A.J. Gonsalves, A. Magana, H.S. Mao, D.E. Mittelberger, K. Nakamura, J.R. Riley, D. L. Syversrud, C. Tóth, N. Ybarrolaza
LBNL, Berkeley, California, USA

Funding: This work was supported by the DOE, Office of High Energy Physics under contract DE-AC02-05CH11231.
The BELLA Project was formally launched and funded in 2009 by the Department of Energy, Office of High Energy physics to develop a new laser facility for forefront experiments on laser plasma acceleration at LBNL. The laser specifications were determined by relying on previous experiments that showed GeV electron beams and simulations. The BELLA laser can operate at peak power levels on the order of a Petawatt with a record setting repetition rate of 1 Hz for such a class of laser. Experiments have started in early 2013 and are aimed at studying the interaction of intense laser pulses in both gas jet and capillary discharge based plasma sources with as goal to obtain multi-GeV beams from structures that are less than a meter in length.

THOCA2

Experimental Progress on Staged Laser-plasma Acceleration

1108

S. Shiraishi, C. Benedetti, E. Esarey, C.G.R. Geddes, A.J. Gonsalves, W. Leemans, N.H. Matlis, K. Nakamura, C.B. Schroeder, B. Shaw, T. Sokollik, S. Steinke, C. Tóth, J. van Tilborg
LBNL, Berkeley, California, USA

Funding: This work is supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and the National Science Foundation.
Laser-plasma accelerators (LPAs)* have produced GeV electron beams (e-beams) from cm-scale devices, demonstrating that LPAs have great potential for reducing accelerator size and cost**]. LPA experiments performed to date utilize a single laser that drives the wakefield for injection and acceleration. For applications such as high-energy accelerators, LPA designs will rely on sequencing multiple acceleration stages, each driven by its own laser***. We present recent progress on the experiment staging two LPA modules at the LOASIS Program at Lawrence Berkeley National Laboratory. The experiment utilizes a 40 TW class laser which is split into two laser pulses. The first laser drives the first LPA module to produce an e-beam. The second laser drives the second LPA module and accelerates the e-beam from the first LPA. Excited wakefields in the second LPA module are diagnosed through spectral redshifting of the drive laser, which is an indicator of the efficiency of laser energy transfer into the plasma through the generation of coherent plasma wakefields****.
* E. Esarey, C.B. Schroeder, and W.P. Leemans, Rev. Mod. Phys. 81 (2009).
** W.P. Leemans, et al., Nature Physics 2, 696 (2006).
*** W.P. Leemans and E. Esarey, Physics Today 62, 44 (2009).
**** B.A. Shadwick, et al. Phys. Plasmas 16, 056704 (2009).

Slides THOCA2 [18.166 MB]

Paper	Title	Page
THYAA1	BELLA Laser and Operations	1097
	W. Leemans, J. Daniels, A. Deshmukh, A.J. Gonsalves, A. Magana, H.S. Mao, D.E. Mittelberger, K. Nakamura, J.R. Riley, D. L. Syversrud, C. Tóth, N. Ybarrolaza LBNL, Berkeley, California, USA
	Funding: This work was supported by the DOE, Office of High Energy Physics under contract DE-AC02-05CH11231. The BELLA Project was formally launched and funded in 2009 by the Department of Energy, Office of High Energy physics to develop a new laser facility for forefront experiments on laser plasma acceleration at LBNL. The laser specifications were determined by relying on previous experiments that showed GeV electron beams and simulations. The BELLA laser can operate at peak power levels on the order of a Petawatt with a record setting repetition rate of 1 Hz for such a class of laser. Experiments have started in early 2013 and are aimed at studying the interaction of intense laser pulses in both gas jet and capillary discharge based plasma sources with as goal to obtain multi-GeV beams from structures that are less than a meter in length.

THOCA2	Experimental Progress on Staged Laser-plasma Acceleration	1108
	S. Shiraishi, C. Benedetti, E. Esarey, C.G.R. Geddes, A.J. Gonsalves, W. Leemans, N.H. Matlis, K. Nakamura, C.B. Schroeder, B. Shaw, T. Sokollik, S. Steinke, C. Tóth, J. van Tilborg LBNL, Berkeley, California, USA
	Funding: This work is supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and the National Science Foundation. Laser-plasma accelerators (LPAs)* have produced GeV electron beams (e-beams) from cm-scale devices, demonstrating that LPAs have great potential for reducing accelerator size and cost]. LPA experiments performed to date utilize a single laser that drives the wakefield for injection and acceleration. For applications such as high-energy accelerators, LPA designs will rely on sequencing multiple acceleration stages, each driven by its own laser. We present recent progress on the experiment staging two LPA modules at the LOASIS Program at Lawrence Berkeley National Laboratory. The experiment utilizes a 40 TW class laser which is split into two laser pulses. The first laser drives the first LPA module to produce an e-beam. The second laser drives the second LPA module and accelerates the e-beam from the first LPA. Excited wakefields in the second LPA module are diagnosed through spectral redshifting of the drive laser, which is an indicator of the efficiency of laser energy transfer into the plasma through the generation of coherent plasma wakefields**. E. Esarey, C.B. Schroeder, and W.P. Leemans, Rev. Mod. Phys. 81 (2009). W.P. Leemans, et al., Nature Physics 2, 696 (2006). * W.P. Leemans and E. Esarey, Physics Today 62, 44 (2009). **** B.A. Shadwick, et al. Phys. Plasmas 16, 056704 (2009).
	Slides THOCA2 [18.166 MB]