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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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slide1

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

slide2

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

slide3

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

slide5

The experimental setup scheme

Parameters of Preliminary Thomson

scattering experiments

5

slide6

The measurement result for X-ray from MCP

6 ns

1.7x104/pulse

X-ray photon

6

slide8

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

slide9

(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

slide10

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

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

10

slide11

FM and HOM data calculated and measured

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

11

slide12

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
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
2 Cell Cavity design for LBNL

B_peak

  • Peak magnetic field @ iris

Waveguide damper for LOM and HOM

14

impedance after waveguide damping
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
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
Cold Test on Al model for Damping

Cavity with/without Waveguide damping

17

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Thanks for

your attention!

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