MA15Specifications

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JSPWiki v2.0.52


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
1.10 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 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 10.60 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:

Actual Ramp Limits

                                                 
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 


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This page last changed on 06-Sep-2021 12:56:09 UTC by MarkusZolliker.