Pair monitor studies

1
Pair monitor studies

• K.Ito 2007/06/20
• Tohoku Univ.

2
Striped pattern
There is the striped pattern with option BOX
and also LEGO.
3
Comparison with old-simulation(measurement of
vertical size)
e hits

• Bunch size 639nm/5.7nm/300µm
• Crossing angle 14mrad
• Pair monitor z400cm
• Solenoid field and anti-DID

5.3
4
Simulation by Saigo (Tohoku) in 2002

• Bunch size 243nm/3.0nm/110µm
• Crossing angle 6mrad
• Pair monitor 176cm
• Solenoid field

10
5
Simulation with uniform B field (2007/3)
xy-plot
e hits
R NH/NL
Beam pipe
rphi-plot

• Bunch size 639nm/5.7nm/300µm
• Crossing angle 14mrad
• Pair monitor z400cm
• Uniform solenoid field

20
6
Status report

• Asking Brett for realistic anti-DID field now.
• Making pair monitor in Jupiter.

Beam pipe

• Parameter (default)
• J4PM.OuterR (10cm)
• J4PM.HoleR.Upstream (1.0cm)
• J4PM.HoleR.Downstream (1.8cm)
• J4PM.ZLength (0.02cm)
• J4PM.ZPosition (400cm)

Pair monitor
CH2Mask
BCAL