Stray field of GLDc

1
Stray field of GLDc

• Yasuhiro Sugimoto
• June 10, 2008
• _at_ECFA08

2
Agreement after TILC08

• A maximum stray field of 200 G at 10 m in Z and
  yoke outer radius 50 cm

Can we achieve it ?
3
GLDc
4
Without MUO gap
5
With no gap between rings
6
Gap partially filled with Fe
t12.5 cm Fe between 25/40 cm Fe slabs
7
Gap partially filled with Fe
t15/30 cm Fe between 25/40 cm Fe slabs
8
Gap partially filled with Fe
t15/30 cm Fe between 25/40 cm Fe slabs 1cm gap
reserved
9
Gap partially filled with Fe
t15/30 cm Fe between 25/40 cm Fe slabs 1cm gap
reserved
10
Gap partially filled with Fe
t15/30 cm Fe between 25/40 cm Fe slabs 1cm gap
reserved
Gap between EC and barrel is reduced from 3cm to
2.5cm
11
Gap partially filled with Fe / 4T
t15/30 cm Fe between 25/40 cm Fe slabs 1cm gap
reserved
Gap between EC and barrel is reduced from 3cm to
2.5cm
12
Conclusion

• In order to achieve the requirement for the stray
  field of lt200 G at RgtRdet0.5m,
• Much more Fe should be used
• or
• Gaps between rings should be partially (gt50)
  filled with Fe
• For 4T, still more Fe is needed to suppress the
  stray field