Z

X

Y

Frame 001 05 Feb 2004 As built out to gate valve 2

200 mm 58Ni 99% specular guide

200 mm DLC 50% diffuse “T”

65.5 mm DLC 99% specular guides

100% diffuseSS flange

SD2

Cu gap

Stopping UCN positions

Z

X

Y

Frame 001 05 Feb 2004 As built out to gate valve 2

Stopping UCN positions

SD2

Flapper

X Y

Z

Frame 001 05 Feb 2004 As built out to gate valve 2

First bend90% specular DLC

Cu gaps

Stopping UCN positions

X Y

Z

Frame 001 05 Feb 2004 As built out to gate valve 2

Pump-out port and gate valve 190% specular DLC

Entrance to gate valve 2

Z

X

Y

Frame 001 05 Feb 2004 As built out to gate valve 2

PPM Magnetic field region Al window and fixture

6.4 mm Monitor hole 13.1+/-0.1x10-10 UCN/p

6.4 mm Monitor hole 22.0+/-0.3x10-11 UCN/p

65.5 mm Entrance to GV 24.87+/-0.04x10-9 UCN/p100% polarized

Stopping UCN positions

Where do the UCN go?(flapper obstruction not simulated)

Lost in the SD2 45.12%Lost in the vertical guides 42.32Lost in the SS flange 5.15Lost in the DLC guides before the Al window 2.71Lost in the Cu gaps 0.86Lost in the Al window 0.56Lost in the DLC guides after the Al window 0.07Leaks and numerical losses 0.04Still in the system* (at 240 s) 0.83Exited the monitoring holes 0.15Arrived at gate valve 2 2.19 100.0* System defined out to gate valve 2