MA15Specifications

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MA15 Specifications

Sample space dimensions

see Magnet List

Other specifications


Magnet
field at sample 14.9 Tesla
" without lambda stage13.5 Tesla
operating current for 14.9 T<120 A
maximum allowed vertical magnetic forces1000 N
maximum allowed horizontal magnetic forces1000 N
homogeneity over a 10 mm diameter sphere0.5%
field stability in persistent mode0.01 % / hour

Stray Field at 14.9 Tesla
at 1 m horizontal distance330 Gauss
at 1 m vertical distance660 Gauss
critical distance for loose ferromagnetic parts
500 Gauss/metre
1.40 m vertical
1.20 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 above3 K
exchange gas needed in sample space (measured at RT)<15 mbar

Dimensions
sample space diameter above magnet49.5 mm
diameter of sample space20 mm
max. useable sample height20 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 thickness43.4 mm
total radial aluminium in entrance window8.6 mm
entrance window size (radiussed corners 3 mm)15 x 15 mm
diameter for transfer tube12 mm

Cryostat
total weight including cryogens650+-30 kg
useable LHe capacity55 l
LHe boil off (static mode)<350 cc/hr
LN2 capacity60 l
typical LN2 boil off600 cc/hr

Ramp limits as defined from OI

Ramp Rate [A/min]up to [A]Ramp Rate [Tesla/min]Up to [Tesla]Ramp time [min]
2.4 82 0.3125 10.6 34
1 98 0.13 12 16
0.3 108 0.04 14 33
0.2 115.25 0.025 14.9 37

There are only a little number of breakpoints - interpolatting the ramp rate with more breakpoints resulted in the following, actual used FAST ramp settings. After a (trainig?) quench on June 11, 2015, the SLOW settings are proposed to be set a bit lower than the original:

Actual Ramp Limits

fast ramp rate   slow ramp rate    up to field    total time [min]
[A/min] [T/min]  [A/min] [T/min]    [A]     [T]   fast   slow
    2.4   0.310      2.4   0.310     82   10.60     34     34
    1.7   0.220      1     0.129     89   11.50     38     41
    1.3   0.168      1     0.129     94   12.15     42     46
    1     0.129      0.5   0.065     98   12.67     46     54
    0.75  0.097      0.3   0.039    101   13.05     50     64
    0.52  0.067      0.25  0.032    104   13.44     56     76
    0.4   0.052      0.2   0.026    106   13.70     61     86
    0.3   0.039      0.2   0.026    108   13.96     68     96
    0.24  0.031      0.2   0.026    109.5 14.15     74    104
    0.19  0.025      0.19  0.025    111   14.35     82    112
    0.16  0.021      0.16  0.021    112.2 14.50     89    119
    0.14  0.018      0.14  0.018    113.1 14.62     96    125
    0.12  0.016      0.12  0.016    114   14.73    103    133
    0.1   0.013      0.1   0.013    115.3 14.90    116    146


This particular version was published on 12-Jun-2015 11:40:50 UTC by MarkusZolliker.