TY  - CONF
AU  - Raparia, D.
AU  - Atoian, G.
AU  - Ikeda, S.
AU  - Lambiase, R.F.
AU  - Milner, R.
AU  - Musgrave, M.M.
AU  - Okamura, M.
AU  - Poblaguev, A.
AU  - Ritter, J.
AU  - Trabocchi, S.
AU  - Zelenski, A.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Development of Spin Rotator and an Absolute Polarimeter for Polarized He-3 at BNL
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - EBIS Preinjector will provide longitudinally polarized 3He++ ions with about 80% polarization and 5.10¹¹ particles per bunch at 6 MeV, which must be rotated to vertical direction before it ions are injected into the Booster. The 3He++ longitudinal polarization is first rotated to the transverse direction by the 21.5° bending magnet. Then the solenoid spin-rotator rotates the spin to the vertical direction. The spin-rotator will be a pulsed solenoid with a reversible field to enable spin flips. The vertically polarized beam will be returned back to the straight HEBT line by the system of three dipole magnets after the spin rotator solenoid. The low-energy polarimeter can be installed in the straight beam line section after the second dipole magnet. To measure transverse (vertical) polarization of the 3He beam at 5-6 MeV, the spin correlated asymmetry of 3He scattering on a 4He gas target (~5 Torr) will be measured with left/right symmetric strip detectors. Paper will present status of the project.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2440
EP  - 2442
KW  - dipole
KW  - polarization
KW  - solenoid
KW  - scattering
KW  - target
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPMP048
UR  - http://jacow.org/ipac2019/papers/wepmp048.pdf
ER  - 

TY  - CONF
AU  - Othman, M.A.K.
AU  - Dolgashev, V.A.
AU  - Haase, A.A.
AU  - Jawla, S.
AU  - Nanni, E.A.
AU  - Neilson, J.
AU  - Picard, J.F.
AU  - Schaub, S.C.
AU  - Spataro, B.
AU  - Tantawi, S.G.
AU  - Temkin, R.J.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Initial Results of High-Gradient Breakdown Tests for W-Band Accelerating Structures
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Emerging accelerator technology at mm-wave and THz frequencies has recently shown notable progress. Indeed, metallic and dielectric accelerating structures at THz frequencies are plausible candidates toward miniaturization of accelerators. RF breakdown in such structures is a major factor limiting their performance. Therefore, comprehensive analysis of RF breakdown physics in mm-wave accelerating structures is needed, which includes understanding of dependencies of the breakdown rate on geometric, electromagnetic and material properties. In this work we report on high power tests of a 110 GHz single-cell standing wave accelerating structure powered by a 1 MW gyrotron. The RF power is coupled from the gyrotron into the accelerating structure with a Gaussian to TM01 mode converter through a quasi-optical setup. We demonstrate coupling of 10 ns, 100s of kilowatt pulses into the structure using a fast switch and achieving ~150 MV/m accelerating gradients. Measurements of RF signals and field-emitted currents allow for complete comprehensive of the high-gradient behavior of W-band structures, including breakdown probability.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3769
EP  - 3771
KW  - cavity
KW  - experiment
KW  - electron
KW  - laser
KW  - vacuum
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPGW080
UR  - http://jacow.org/ipac2019/papers/thpgw080.pdf
ER  -