IBIC2012 - List of Authors (Takeda, K.)

Paper

Title

Page

Electron Storage Ring as a Single Shot Linac Beam Monitor

302

Y. Shoji, K. Takeda
LASTI, Hyogo, Japan
T. Asaka, Y. Minagawa, S. Suzuki, Y. Takemura
JASRI/SPring-8, Hyogo-ken, Japan

The SPring-8 linac has been operated as an injector to the electron storage ring, NewSUBARU. Because of the small acceptance of the ring, fine parameter tuning is required for the stable top-up injection. In that process, some single shot linac beam measurements were necessary to understand the shot-by-shot fluctuation of the injection efficiency. We used the electron ring itself as a linac beam monitor. The time-resolving visible light monitor in the ring records the profiles of the injected linac beam for many revolutions. The pulse width for the single rf bucket (500MHz) of the ring is normally 1 ns, which contains 3 linac bunches (2856MHz). The time profile in the ring gives the energy profile at after 1/4 of the synchrotron oscillation period. The spatial profile of several revolutions, recorded by a double-sweep streak camera or ICCD gated camera, gives a beam emittance of a single-shot. The streak camera enables the bunch by bunch measurement. The effective resolution depends on the beta function of the ring, which can easily be changed. For the vertical emittance, our spatial resolution of 0.3 mm FWHM at βy = 17 m was good enough to identify the quadrupole mismatch.

Slides TUCC01 [1.481 MB]

Paper	Title	Page
TUCC01	Electron Storage Ring as a Single Shot Linac Beam Monitor	302
	Y. Shoji, K. Takeda LASTI, Hyogo, Japan T. Asaka, Y. Minagawa, S. Suzuki, Y. Takemura JASRI/SPring-8, Hyogo-ken, Japan
	The SPring-8 linac has been operated as an injector to the electron storage ring, NewSUBARU. Because of the small acceptance of the ring, fine parameter tuning is required for the stable top-up injection. In that process, some single shot linac beam measurements were necessary to understand the shot-by-shot fluctuation of the injection efficiency. We used the electron ring itself as a linac beam monitor. The time-resolving visible light monitor in the ring records the profiles of the injected linac beam for many revolutions. The pulse width for the single rf bucket (500MHz) of the ring is normally 1 ns, which contains 3 linac bunches (2856MHz). The time profile in the ring gives the energy profile at after 1/4 of the synchrotron oscillation period. The spatial profile of several revolutions, recorded by a double-sweep streak camera or ICCD gated camera, gives a beam emittance of a single-shot. The streak camera enables the bunch by bunch measurement. The effective resolution depends on the beta function of the ring, which can easily be changed. For the vertical emittance, our spatial resolution of 0.3 mm FWHM at βy = 17 m was good enough to identify the quadrupole mismatch.
	Slides TUCC01 [1.481 MB]