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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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Presented by Qingzi Xing
Accelerator lab, Dep. Engineering Physics, Tsinghua Univ.
Nov. 6th, 2007, IHEP
Electron and laser photon interaction: Positron source & beam diagnostics
Positron Source(Compton Scheme)
From KURIKI Masao, ILC School 2006
From Marc Ross, ILC School 2007
Parameters of Preliminary Thomson
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.
(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
Calculated (Left) and Measured* (Right) dispersion curves of the monopole and dipole modes
* ▲ and indicates the different polarization in the dipole passbands.
①: n=0 for monopoles, n=2 for dipoles; a, b indicate polarizations.
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.
From Andrei Seryi, ILC School 2006
Hard X-ray pulses by electron bunch manipulation and x-ray compression
Waveguide damper for LOM and HOM
Storage ring needed to damp the LOM and HOMs
Waveguide for LOM, HOM and unwanted Dipole mode at x-direction
Impedance below threshold
Holes for “Bead-pull”
Q is lower because of
Parallel wire to make a “bead”
Cavity with/without Waveguide damping