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Summary WG5
R&D for Innovative Accelerators
Greg LeBlanc
Recent studies of laser-driven electron acceleration
and x-ray radiation in IOP
Wenchao Yan
Laboratory of Optical Physics, Institute of Physics, CAS,
Beijing 100190, China
([email protected])
AFAD 2014 and ACAS Workshop
on Future Light Sources , Melbourne, Australia
Jan. 14-16, 2014
Betatron rad. using 3TW laser + clusters
Betatron x-ray
Electrons
By using Ar clusters, electron beam with
large charge will be accelerated which
enhance the betatron radiation.
Betatron radiation enhancement
(>3 keV, 10mrad, 2x10^8 phs, >1021 phs/s/../0.1%BW)
Betatron rad. using 3TW laser + clusters
He uniform density distribution
He, >3MeV, t=160T
e- distribution
simulation results show that the direct
laser acceleration (DLA) has important
contribution to drive electrons with large
oscillations in the case of a clustering gas
target.
It turns out that the energy gain from DLA
counts for 76% of the total energy gain
with clustering target.
Ar clustering density distribution
Ar, >10MeV, t=160T >20MeV, t=160T
>30MeV, t=200T
AFAD 2014 and ACAS Workshop on Future Light Sources, Jan.
14-16, 2014 (2E-33)
Room-temperature Burst-mode GHz and
THz Pulse Rate Photoinjector for Future
Light Sources
Yen-Chieh Huang*
Chia-Hsiang Chen, Kuan-Yan Huang, Fu-Han Chao
HOPE Laboratory, Institute of Photonics Technologies
National Tsinghua University (NTHU), Hsinchu, Taiwan
*[email protected]
Pulse-train Photoinjector: high average power, bunched beam
GHz ~ THz
PHz
photoinjector
velocity bunching
Magnetic bunching
Bunching Frequency Multiplication
macropulse
Compressed macropulse
(Yen-Chieh Huang, NTHU, Taiwan)
Desktop MW THz Free-electron Laser
THz DFG
THz-pulse-train laser
(Nonlinear
material)
Narrow-line mW THz wave
Nrrow
line THz
Solenoid
12 cm
~50 cm
50 cm
10 MW
power at
THz
Single-pass undulator
Photocathode gun
1.2 m
(Yen-Chieh Huang, NTHU, Taiwan)
“Hand-held” XFEL
Dielectric laser accelerator (~1 GeV/m)
Dielectric laser undulator
Huang & Byer
T. Plettner, R. L. Byer, Phys. Rev. ST Accel. Beams
11, 030704 (2008).
36 cm
Design Example for a 1 Å XFEL
Beam energy = 300 MeV, peak current = 12 kA, undulator period = 100 m,
gain length = 3 mm,
(Yen-Chieh Huang, NTHU, Taiwan)
Research on Novel Acceleration Technology at KEK
K. Koyama @ KEK
Laser driven dielectric accelerator
Expected features and applications
Optical microscope
Oscillator
Phase shifters
Amplifiers
Fiber laser
1. Present problems
stability, luminosity
2. Possible solutions
separate the acc. stage from el. source
Afterburner (post-acceleration) plan
Key technologies for afterburner experiments
Hollow plasma channel
Z-pinch, gas-fill capillary (are just started)
Wakefield excitation in linear regime and diagnostics
under designing
New laser for accelerators
Yb-laser (high efficiency)
Short bunch of the rf-linac output
< 80 fs (injector linac of KEK or small linac of AIST will be used)
For achieving the energy gain of 5 GeV，
parameters of the plasma channel are ne≈2x1017 cm-3, Lacc=30 cm,
the laser power and pulse width are PL=200 TW, τL=80 fs (a0= 1.5), rL=37 µm
Afterburner technology will be accomplished by 2020 and transferred to SACLA-II.
Recent Studies on Laser-Plasma
Acceleration @ IHEP
Dr. Dazhang LI & Prof. Jie GAO
IHEP laser plasma acceleration research group
LPA experiment on TW-level lasers
Laser: XL-II laser facility in IOP
200mJ/80fs/2-3TW,
OAP：f/6，ASE contrast: >108
Nozzle：1.2mm (long)×10mm (width)
GAS: 0.5~7.5MPa, He gas/Ar cluster
Beam quality：23 MeV/~7%/6 pC/2 mrad
♦ Best beam quality by using several TW lasers, narrow plasma density interval is
♦ Lowest NDA in LPA domain (92 mrad, at least 5 times smaller than previous experiment results)
♦ Has the potential to obtain monoenergetic electron beam with ultrasmall normalized emittance
♦ Valid in a narrow plasma density interval, 2D PIC simulation suggests the smooth transfer from SM-LWFA to
LWFA is the key point
LPA experiment on 100 TW-level lasers
SIMU.
EXP.
Callisto @ Jupiter Laser Facilities:
6-12J/60fs/100-200TW
OAP: f/12; Nozzle: 10mm×1.2mm
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