Magnet | |
---|---|
field at sample | 14.9 Tesla |
" without lambda stage | 13.5 Tesla |
operating current for 14.9 T | <120 A |
maximum allowed vertical magnetic forces | 1000 N |
maximum allowed horizontal magnetic forces | 1000 N |
homogeneity over a 10 mm diameter sphere | 0.5% |
field stability in persistent mode | 0.01 % / hour |
Stray Field at 14.9 Tesla | |
at 1 m horizontal distance | 330 Gauss |
at 1 m vertical distance | 660 Gauss |
critical distance for loose ferromagnetic parts 500 Gauss/metre | 1.10 m vertical 0.87 m horizontal |
Variable Temperature Insert | |
temperature range (no field dependend limitations) | 1.6 ... 300 K |
temperature stability | +- 0.1 K |
automatic needle valve control only above | 3 K |
exchange gas needed in sample space (measured at RT) | <15 mbar |
Dimensions | |
sample space diameter above magnet | 49.5 mm |
diameter of sample space | 20 mm |
max. useable sample height | 20 mm |
split access angle | +- 2 deg |
sample height for +-2 deg access(visible by neutrons) | 14 mm |
horizontal access angle | > 330 deg |
distance from base of cryostat to scattering plane | 240 mm |
total radial aluminium window thickness | 43.4 mm |
total radial aluminium in entrance window | 8.6 mm |
entrance window size (radiussed corners 3 mm) | 15 x 15 mm |
diameter for transfer tube | 12 mm |
Cryostat | |
total weight including cryogens | 650+-30 kg |
useable LHe capacity | 55 l |
LHe boil off (static mode) | <350 cc/hr |
LN2 capacity | 60 l |
typical LN2 boil off | 600 cc/hr |
Ramp Rate [A/min] | up to [A] | Ramp Rate [Tesla/min] | Up to [Tesla] | Ramp time [min] |
---|---|---|---|---|
2.4 | 82 | 0.3125 | 10.60 | 34 |
1 | 98 | 0.13 | 12.67 | 50 |
0.3 | 108 | 0.04 | 13.96 | 83 |
0.2 | 115.25 | 0.025 | 14.90 | 120 |
There are only a little number of breakpoints - interpolatting the ramp rate with more breakpoints resulted in the following, actually used FAST ramp settings.
After a (training?) quench on June 11, 2015, some SLOW ramp limits values are set a bit lower than the original ones:
up to ramp limit ramp time up to ramp limit no field fast slow fast slow current fast slow ----- --------------- ----------- ------- --------------- -- [T] [T/min] [T/min] [min] [min] [A] [A/min] [A/min] 10.60 0.310 0.310 34 34 82.0 2.40 2.40 01 11.50 0.220 0.129 38 41 89.0 1.70 1.00 02 12.15 0.168 0.129 42 46 94.0 1.30 1.00 03 12.67 0.129 0.065 46 54 98.0 1.00 0.50 04 13.05 0.097 0.039 50 64 101.0 0.75 0.30 05 13.44 0.067 0.032 56 76 104.0 0.52 0.25 06 13.70 0.052 0.026 61 86 106.0 0.40 0.20 07 13.96 0.039 0.026 68 96 108.0 0.30 0.20 08 14.15 0.031 0.026 74 104 109.5 0.24 0.20 09 14.35 0.025 0.025 82 112 111.0 0.19 0.19 10 14.50 0.021 0.021 89 119 112.2 0.16 0.16 11 14.62 0.018 0.018 96 125 113.1 0.14 0.14 12 14.73 0.016 0.016 103 133 114.0 0.12 0.12 13 14.90 0.013 0.013 116 146 115.3 0.10 0.10 14