Details of K 1 8 BR Beam line

Details of K 1. 8 BR Beam line Masami Iio

K 1. 8 BR Beam Line PT Max Momentum 1. 1 Ge. V/c Beam line length 27. 573 m Acceptance 2. 6 msr・ % Horizontal extent @FF (rms) 6. 1 mm Vertical extent @FF (rms) 3. 0 mm

Envelopes of Kaon Beam Vertical extent Horizontal extent

Transport calculation by Turtle < The definition of a beam > n n Negative Kaon (1. 1 Ge. V/c) One half the Horizontal and Vertical extent : 0. 3, 0. 3 cm One half the Horizontal and Vertical angular divergence : 100, 20 mr Momentum bite : ± 3%

K Beam Profile@FF (Position)

K Beam Profile@FF (Shape)

Angle of K Beam@FF

Position-angle correlation@FF

Momentum Bite

Position-Momentum bite correlation@FF

Back ground Pion Profile

Pion Profile@FF (Position)

Pion Profile@FF (Shape)

Angle of Pion @FF

Position-angle correlation@FF

Momentum Bite

Position-Momentum bite correlation@FF

Number estimation of particles

Momentum dependence of Acceptance n K- beam is cut to the slit in separator with the change of kick angle depending on momentum.

Physics process Cross Section Decay

K- Yield in the final focus n If Electric Field of Separator is fixed, Acceptance decreases. n If Kick Angle is fixed, decrease of Kaon is dominant in the Decay.

K/p Separation@MS Profile (Y-position) Mean shift

K/p Ratio@FF (Fixed E) n If electric field of separator was fixed(50 k. V/cm), K/Pi ratio improves as momentum of particle decreases.

K/p Ratio@FF (Fixed KA ) n If Kick Angle of Kaon is fixed (-15. 32 mrad), K/Pi ratio gets worse as momentum of particle decreases.