D1 and MCBXC pressurized superfluid helium channels sizing for heat extraction

1. D1 and MCBXCpressurized superfluid helium channels sizing for heat extraction Rob van Weelderen 28.11.2012

2. Layout as used for quantifying necessary free space for heat extraction via the superfluid helium for D1 & MCBXC 10 W 2.050 K (non IP-end) 10 W + Q 2.000 K Or 10 W + Q 2.000 K ~ 12.9 m (including interconnects) ~ 4.0 m 2.100 K (collar nose) 2.170 K (coil) 2.170 K (coil) HeIium HeIium HeIium D1 Q3 MCBXC Layout & dynamic loads based to be confirmed) • Assumptions: • - D1 is passively cooled via conduction through pressurized HeII • - The inner triplet magnets are actively cooled with maximum T of 2.000 K • MCBXC is actively cooled as well  12.9 m conduction cooling length • MCBXC is passively cooled ………. 16.9 m conduction cooled length • T cold mass D1 at IP end 2.050 K  50 mK“budget” to extract heat longitudinally • T at D1 coil  220 mK“budget” to extract heat from D1 coil

3. Free conduction area as function of total power deposition50 mK from 2050 K to 2.000 K, 12.9 or 16.9 m conduction length