SLEGS Proto type on SINAP LINAC

SLEGS Proto type on SINAP LINAC

Jin-Gen Chen & SLEGS Collaboration

May 18th 2006 The 6th China Japan Nuclear Physics Symposium

Outline

A brief introduction of Shanghai Synchrotron Radiation Facility (SSRF) & Shanghai Laser Electron Gamma Source (SLEGS)

SINAP LINAC and Candidate lasers The simulated results for backscattering Progress in setup of proto type of SLEGS


SSRF Layout

100MeV Linac injector3.5GeV Booster3.5GeV Storage Ring

Wide range of wave length High power and high brightnessSmall pulse length High linear or circular polarization High efficiency High flexibility

Characteristics of SSRF


SLEGS @ SSRF

Astro-nuclear physics (e.g. 3 process)

Spin-physics Hadron & Nuclear physics - Photo-disintegration - ( ,n) reactions

Nuclear Fluorescent Application for material science New photon sources with

quantum technologies …

Physics Goals


SLEGS @SSRF

1-25MeV, will be made by SINAP in 2008 at SSRF, China

Candidate laser

Maximum of power~1.5 kW Backscattering Gamma

Wave length(m) Energy (eV) Largest energy (MeV) intensity(s-1)

CO2

10.6 0.117 21.9

108－ 101065.1 0.0190 3.58

100 0.0124 2.33

220 0.0056 1.06

rather flat energy distribution with small spreadinghigh linear- or circular-polarization


100 MeV LINAC

At present, SLEGS construction is under its primary stage. We now carrying out the construction of its proto type----a x-ray facility at 100 MeV LINAC.


Main features of LINAC- present

single bunch mode; Energy: 100 [MeV]; Energy resolution: 0.9%; Pulse length: 1 [ns] (FW

HM), 1.28 [A]; 1 Normalized emittance:

107 (x), 137 (y) [ mrad];


Candidate lasers


100 MeV LINAC vs. CO2 laser as a sample

CO2 laser: =10.64 [m] Infrared. Waist radius: down to ~10

[m] Power of CW laser: up to

~1500 [W] Well-developed and

generally-used in industry. Relatively low cost.


The differential flux changes sharply with the transform of interaction position if waist width is very small but becomes insensitive when waist width of laser is large enough.

Total luminous flux increases and then decreases with increase of waist width of laser. In addition, a longer wave length laser corresponds a larger total luminous flux at the same waist width of laser.


The collimation of laser and electron

约 1m

生成准直孔Ф0.5mm

反射镜

电子束流

观察窗

约 1m

准直孔Ф0.5mm

反射镜

准直光路

CO2激光光路

观察窗做一垂直标记

CO2激光入射窗

检验共轴

约 1m

准直孔Ф0.5mm

反射镜

CO2激光入射窗

1. To give a collimation initialization via the transport of electron beam2. Co-axis of the collimated laser and the co2 laser 3. Readjustment of the co2 laser after the co2 being fixed at the LINAC4. Readjustment of the electron beam


Ideal results

real results



Estimation of background

1 2 3 4 50.0

0.1

0.2

0.3

0.4

0.5

计数

n半径 r

Background from synchrotron radiation Background from bremsstrahlung of electron and air


Other relevant equipments

1. Data acquirement system 2. Control system 3. Detector system 4. Chamber of target


Schedule


Budget

Thank you very much!

Documents

SLEGS Proto type on SINAP LINAC