Activities of Accelerator lab, Tsinghua Univ. on ILC-related researches
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Activities of Accelerator lab, Tsinghua Univ. on ILC-related researches. Presented by Qingzi Xing Accelerator lab, Dep. Engineering Physics, Tsinghua Univ. Nov. 6 th , 2007, IHEP. A preliminary Thomson Scattering X-ray experimental setup

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Activities of Accelerator lab, Tsinghua Univ. on ILC-related researches

Presented by Qingzi Xing

Accelerator lab, Dep. Engineering Physics, Tsinghua Univ.

Nov. 6th, 2007, IHEP


  • A preliminary Thomson Scattering X-ray experimental setup

  • Field tuning and HOMs measurement of the 9-cell ICHIRO copper cavity model

  • SC Deflecting Cavity for ultra-fast X-ray pulse

2


  • A preliminary Thomson Scattering X-ray experimental setup

Electron and laser photon interaction: Positron source & beam diagnostics

Positron Source(Compton Scheme)

From KURIKI Masao, ILC School 2006

Laserwire components

From Marc Ross, ILC School 2007

3


A preliminary Thomson Scattering X-ray experimental setup

4


The experimental setup scheme

Parameters of Preliminary Thomson

scattering experiments

5


The measurement result for X-ray from MCP

6 ns

1.7x104/pulse

X-ray photon

6


A Proposed Thomson Scattering X-ray Source (Using 60~100MeV Linac)

7


  • Field tuning and HOMs measurement OF the 9-cell ICHIRO copper cavity model

9-cell superconducting ICHIRO copper cavity model provided by KEK.

Relative axial electric field of the TM010_PI mode obtained from the bead-pull measurement. The field flatness is 53.2% before tuning, and 97.2% after tuning with the PI mode freq. of 1298.2 MHz.

Field flatness measurement system of the ICHIRO cavity.

8


(a) Perturbation of cell No. 1

(d) Perturbation of cell No. 4

(b) Perturbation of cell No. 2

(e) Perturbation of cell No. 5

The change of the field and the spectrum due to the perturbation of individual cells, based on the analysis of the equivalent circuit model .

(c) Perturbation of cell No. 3

9


Calculated (Left) and Measured* (Right) dispersion curves of the monopole and dipole modes

* ▲ and indicates the different polarization in the dipole passbands.

10


FM and HOM data calculated and measured

①: n=0 for monopoles, n=2 for dipoles; a, b indicate polarizations.

11


Relative frequency shift of the TE111_PI mode 1.5cm off the axis obtained from the bead-pull measurement using a dielectric (Left) needle ( d = 1.4 mm, l = 16.6 mm ) and a metal (Right) needle ( d = 0.31 mm , l = 20 mm ) as perturbation objects. |E| (Up) and Ez (Down) are mainly measured.

12


SC Deflecting Cavity for ultra-fast X-ray pulse

  • Deflecting Cavity can be used to generate sub-picosecond’s X-ray pulses. The scheme is shown below.

  • Proposed at LBNL, ANL… Collaboration

x

Crab crossing

From Andrei Seryi, ILC School 2006

RF kick

Hard X-ray pulses by electron bunch manipulation and x-ray compression

13


2 Cell Cavity design for LBNL

B_peak

  • Peak magnetic field @ iris

Waveguide damper for LOM and HOM

14


Impedance after Waveguide Damping

Storage ring needed to damp the LOM and HOMs

Waveguide for LOM, HOM and unwanted Dipole mode at x-direction

Impedance below threshold

Longitudinal Impedance

horizontal

vertical

Transverse Impedance

15


Cold Test on Al model

Holes for “Bead-pull”

Q is lower because of

Surface roughness

Cell assembly

Parallel wire to make a “bead”

16


Cold Test on Al model for Damping

Cavity with/without Waveguide damping

17


Bunch Length Measurement by RF Deflecting Cavity

18


different configurations

19


3-Cell Deflecting Cavity Design

20


Thanks for

your attention!


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