1. 小型X線源の性能確認実験計画
高輝度・RF電子銃研究会
広島大学
高エネルギー加速器研究機構
浦川順治

2. Pulse laser storage in optical cavity and X-ray measurement in 2009
X-ray generation with 1000 enhancement by optical cavity
Average power :40kW,
7psec(FWHM),
next step :2MW
Status ： 0.2mJ/pulse,
target ：10mJ/pulse
X-ray measurement
MCP waveform
background subtracted.
Detected X-ray flux
1.2x105 Hz/~10%b.w.
Electron beam size 60mm in s
Beam collision technique
43MeV Multi-bunch beam+ Super-Cavity = 33keV X-ray.
LUCX results
X-ray
Detector
Laser size:30mm in s, target:electron beam size:10mm in s, laser waist size:8mm in s

3. Photo-cathode RF Gun 10MeV 3.5 cell gun 6MeV 1.5 cell gun
From 2002 onward, successive improvements have been incorporated into newer models of the RF gun. In 2008, a new gun incorporating all of the earlier modifications was produced for the ATF. A typical transverse emittance of 1.3 π mm⋅mrad has been obtained under solenoid field of 0.18 T, beam intensity of 1.6nC/bunch, and RF power of 9 MW.
Study to reduce
normalized
emittance.
0.1 pmm-mrad
for 0.1nC/bunch

4. Simple comparison of main parameters
New 1.6 cell RF Cavity
Stable operation
at 130MV/m.
140MV/m
Operation possible.

5. S-band Linac with photo- Advanced Accelerator Facility
cathode RF gun
Multi-bunch electron beam generation, pulse laser
accumulation system Upgrade, R&D of precise
multi-collision control will be done using this normal
conducting facility by end of 2011.
Imaging for X-ray Application
Experiments will be taken
and possibility of this project
will be confirmed soon.
Advanced Accelerator Facility
from 2008 to 2012 for
Quantum Beam R&D
Maximum Energy
50MeV
Maximum Beam
Power
156.26MeV mA
(In the case of 5MeV, <20mrad)

6. Dark current measurement
The Dark current was measured using ICT 1 downstream of solenoid.
The pulse width was 2 ms
Old gun reading were taken in 2006 with quantum efficiency ~ 0.3%

7. Measured BPM and ICT Signal
Low energy; 300 bunch train
Input Power
Calculated Plot
2 September 2010
Measured BPM and ICT Signal

9. Fabrication July 1st Res. freq. meas. of each cell
Rough to fine machining
Field pattern meas.
Mode frequency meas.
End of Aug.

10. 3.5 cell RF Gun Installation

11. After installation
Res. Frequency
Analysis of p mode

13. Operation at ATF

14. 1. 0 m after the replacement from 3m long accelerator to about 0
1.0 m after the replacement from 3m long accelerator to about 0.87m standing wave
accelerator tube. 1m
0.7m
10deg bending, then 10deg bending to make straight line and 1m space
42x2=84cm colliding space for Compton scattering

15. Advanced Photo-cathode RF Gun R&D
720mm
360mm
S-band 3.5 cell RF Gun
~ 10MeV
S-band 12 cell booster linac
to get 50MeV.

16. 電子・レーザー両ビームパラメータ、衝突条件、期待されるX線フラックス(LUCX) 電子ビーム レーザーパルス 衝突条件
10% bandwidth X-ray rate [Hz]
（計算値）
検出器アクセプタンス内のX-ray rate
(測定値)
40MeV,100bunches/pulse,12.5Hzoperation,bunch charge=0.4nC, 2.8nsec bunch spacing, sez=6psec
0.112mJ/pulse, 357MHz burst mode operation in cavity, slz=3psec
sex/sey=200/40mm,
slx/sly=30/30mm,
Crossing angle 20deg.
1.34x105
1.2x105
300bunches/pulse, bunch charge=0.5nC、他同上
1.12mJ/pulse, 357MHz burst mode operation in cavity
sex/sey=60/30mm,
他同上
6.6x106 同上
Crossing angle 10deg.
1.2x107
8000bunches/pulse,他同上
3.3x108
Head-on
9.4x108
sex/sey=20/10mm,
slx/sly=10/10mm
8.5x109
10.2mJ/pulse, 357MHz burst mode operation in cavity
8.5x1010

17. STF
Both side plane mirrors with two rotational direction control
92.3 or 138.4cm
Controlled
Super-invar by
temperature
Position of both spherical mirrors should be controlled by three
dimensional directions independently. Transverse and longitudinal.
Two rotational movements are necessary. No mover table

18. 10.0mJ/pulse, 162.5MHz burst mode operation in cavity, slz=4.3psec
電子・レーザー両ビームパラメータ、衝突条件、期待されるX線フラックス(STF)
電子ビーム
レーザーパルス
衝突条件
10% bandwidth X-ray rate [Hz]
（計算値）
40MeV,162500bunches/pulse, 5Hz operation, bunch charge=0.062nC, 6.15nsec bunch spacing, sez=8.7psec
10.0mJ/pulse, 162.5MHz burst mode operation in cavity, slz=4.3psec
sex/sey=30/30mm,
slx/sly=30/30mm,
Crossing angle 10deg.
2.2x109 同上
Head-on
1.3x1010
sex/sey=10/10mm,
slx/sly=10/10mm,
6.9x109
1.2x1011

21. High brightness X-ray generation by ERL
Demonstration by beam experiment if possible
Early 2013 experiment
From STF
Injector
Super-conducting linac
Beam dump
Laser
E-bunch
X-ray -
Pulse laser optical cavity
Energy recovery
35MeV electron beam x 1mm laser = 23keV X-ray