LINAC2012 - List of Authors (Okamura, M.)

Paper	Title	Page
THPB037	Iron Beam Acceleration with DPIS	936
	M. Okamura BNL, Upton, Long Island, New York, USA P.J. Jandovitz Cornell University, Ithaca, New York, USA T. Kanesue IAP, Frankfurt am Main, Germany M. Sekine RLNR, Tokyo, Japan T. Yamamoto RISE, Tokyo, Japan
	Funding: The work supported by US. DOE and RIKEN Japan. It has been proved that direct plasma Injection Scheme (DPIS) is an efficient way to accelerate high current highly charged state heavy ion beam. More than 50 mA (peak current) of various heavy ion beams can be easily accelerated. However, it was rather difficult to obtain longer pulse especially for highly charged particles. To induce highly charged states ions, a high plasma temperature is required at the laser irradiation point and the high temperature automatically gives a very fast expansion velocity of the plasma. This shortens the ion beam pulse length. To compensate the shorter ion pulse length, we can extend the plasma drift length, but it will dilute the brightness of the plasma since the plasma expands three dimensionally. To avoid the reduction of the brightness, a simple long solenoid was applied to confine the diverging angle of the plasma expansion. In the conference, this new technique will be explained and the latest results of iron beam acceleration will be shown.

THPB051	Improvements at the BNL 200 MeV Linac	969
	D. Raparia, J.G. Alessi, B. Briscoe, J.M. Fite, O. Gould, V. LoDestro, M. Okamura, J. Ritter, A. Zelenski BNL, Upton, Long Island, New York, USA
	After reconfiguration of the low energy (35 keV) and the medium energy (750 keV) transport lines in 2009-10, the Brookhaven linac delivered the highest intensity beam since it was built in 1970 (~120 μA average current of H⁻ to the Brookhaven Linac Isotope Producer). It also delivered lower emittance polarized H⁻ ion beam for the polarized program at RHIC. To increase the intensity further, the match into the RFQ was improved by reducing the distance from the fnal focusing solenoid to the RFQ and replacing the buncher in the 750 keV line with one with higher Q value, to allow operation at higher power. We also found that drift tube linac tank number 7 was operating with about 1 MW lower power than design. The transmission efficiencies and beam quality will be discussed in the paper.

Paper

Title

Page

Iron Beam Acceleration with DPIS

936

M. Okamura
BNL, Upton, Long Island, New York, USA
P.J. Jandovitz
Cornell University, Ithaca, New York, USA
T. Kanesue
IAP, Frankfurt am Main, Germany
M. Sekine
RLNR, Tokyo, Japan
T. Yamamoto
RISE, Tokyo, Japan

Funding: The work supported by US. DOE and RIKEN Japan.
It has been proved that direct plasma Injection Scheme (DPIS) is an efficient way to accelerate high current highly charged state heavy ion beam. More than 50 mA (peak current) of various heavy ion beams can be easily accelerated. However, it was rather difficult to obtain longer pulse especially for highly charged particles. To induce highly charged states ions, a high plasma temperature is required at the laser irradiation point and the high temperature automatically gives a very fast expansion velocity of the plasma. This shortens the ion beam pulse length. To compensate the shorter ion pulse length, we can extend the plasma drift length, but it will dilute the brightness of the plasma since the plasma expands three dimensionally. To avoid the reduction of the brightness, a simple long solenoid was applied to confine the diverging angle of the plasma expansion. In the conference, this new technique will be explained and the latest results of iron beam acceleration will be shown.

THPB051

Improvements at the BNL 200 MeV Linac

969

D. Raparia, J.G. Alessi, B. Briscoe, J.M. Fite, O. Gould, V. LoDestro, M. Okamura, J. Ritter, A. Zelenski
BNL, Upton, Long Island, New York, USA

After reconfiguration of the low energy (35 keV) and the medium energy (750 keV) transport lines in 2009-10, the Brookhaven linac delivered the highest intensity beam since it was built in 1970 (~120 μA average current of H⁻ to the Brookhaven Linac Isotope Producer). It also delivered lower emittance polarized H⁻ ion beam for the polarized program at RHIC. To increase the intensity further, the match into the RFQ was improved by reducing the distance from the fnal focusing solenoid to the RFQ and replacing the buncher in the 750 keV line with one with higher Q value, to allow operation at higher power. We also found that drift tube linac tank number 7 was operating with about 1 MW lower power than design. The transmission efficiencies and beam quality will be discussed in the paper.