MA09SpecificationsManual

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5 Specifications and Test Results

5.1 Magnet Specification

5.1.1 Main Magnet

Symmetric Energisation:

Guaranteed maximum central magnetic field at 4.2K: 8.0 Tesla Guaranteed maximum central magnetic field at 2.2K: 9.0 Tesla

Current for central field of 8 T100.75 A
Current for central field of 9 T 113.34 A
Field / Current ratio 0.0794 T/A (794 Gauss/Amp)
Nominal inductance 88 Henries

Asymmetric Energisation:

Guaranteed maximum central magnetic field at 4.2K4.0 Tesla
Current for central field of 4 T 91.35 Amps
Field / Current ratio 0.0438 T/A (438 Gauss/Amp)
Nominal inductance 46 Henries

Neutron access

340 degrees in horizontal plane
+-6 degrees onto 24 mm on axis in vertical plane.

Switch heater current for open state75 mA

5.1.2.Resistance Values (Ohm)

Room Temp77 Kelvin4.2 Kelvin
Magnet resistance Start-End Sym 47.4 35.9 0.1
Magnet resistance Start-End Asym 45.6 30.8 0.1
Persistent mode switch resistance50 210 205
Switch heater resistance 214
Magnet to cryostat isolation (at 500v)>20 M>20 M>20 M
Main magnet to switch heater>20 M>20 M>20 M
Carbon resistors for lambda point refrigerator
R1142.0 163.0 976.0
R2153.7 176.6 1021
R3166.8 189.3 1015
R4164.9 185.5 1062

5.2 Magnet Energisation

Energisation Rate

Symmetric Energisation:

Energisation Current (A)Energisation Rate (A/min)
0 to 75 3.0
75 to 90 2.0
90 to 100.751.0
100.75 to 113.34
Important: only at 2.2 K!
0.5

Asymmetric Errergisation:

Energisation Current (A)Energisation Rate (A/min)
0 to 75 5.0
75 to 91.352.0

Achieving Persistent Mode

Maximum rate of change of current in the magnet current leads with the magnet in persistent mode (switch heaters off) is: 120 Amps/minute. This rate is programmed into the PS120-10.

For TAS7 users:

Note: For fields > 5T, tilt and translation motors GU,GL,TU,TL must be removed. This prevents the problem of the magnet pulling sideways and touching the inner LN2 shield.

5.3 Typical Lambda Point Performance

Resitance values of carbon resistors

R1
(kOhm)
R2
(kOhm)
R3
(kOhm)
R4
(kOhm)
approximate
time after starting
operation (min.)
Pressure (mbar)
0.9761.0211.0151.06201000
0.9761.0221.1531.3111045
0.9811.448.13431.4922040
0.9891.6701.5681.7213040
1.0151.9971.9002.0514030
1.1002.8602.5952.7805030
1.0973.2523.1403.2726030
1.1904.0754.1154.3217030
3.8404.0804.3905.1308030
Start to energize magnet
from 8 T to 9 T.
3.8504.0904.4205.64011530
9 Tesla achieved
3.8604.1004.4405.930
 

5.4 Cryogenic Performance

Useful helium capacity45 litres
Nitrogen capacity43 litres
Typical liquid helium boil off rate at 4.2 K
(no current in magnet leads, VTI needle valve closed)
330 cc/hr
Typical liquid nitrogen boil off 630 cc/hr
" when current in the leads < 750 cc/hr

5.5 Appendix

Allen-Bradley and Rhodium-Iron Temperature Sensor Characteristics

  • Typical values of temperature versus resistance for an Allen-Bradley carbon resistor with nominal resistance at room temperature of 100 ohms and 270 ohms.
  • Typical values of resistance versus temperature for a 4-wire Rhodium Iron sensor with a nominal resistance of 27 ohms at 273 Kelvin.
  • Please note that this sheet is a guide for cooldown monitoring purposes only, and is not a substitute for a full calibration.

Temperature
(Kelvin)
Allen-Bradley (100 Ohm)
(Ohm)
Allen-Bradley (270 Ohm)
(Ohm)
Rhodium-Iron
(Ohm)
500 51.4
475 48.2
425 42.8
373 37.5
323 32.2
30010027029.8
280100.527327.8
26010127625.7
24010228023.74
22010328521.73
20010429019.69
190104.529318.67
1801052967.66
17010629916.64
16010730415.87
15010830914.53
14010931413.46
13011032012.37
12011232611.38
11011433410.24
1001163439.2
951173488.7
901183548.18
851203607.68
801223677.19
751243756.72
701263846.27
651283955.82
601314075.43
551354205.05
501404354.73
451454554.43
401504854.17
351585203.94
301705603.75
281755803.67
261806103.6
241906403.53
222006803.45
202107303.36
182257903.28
162418603.18
142699803.07
1230011202.95
1035013502.81
939015102.73
844017702.65
752021702.56
662527002.45
5.570031002.4
4.595045002.28
4.2105050002.25
4115055002.22
3.75130062002.19
3.5150071002.16
3.2517008400
3210010000
2.8240012300
2.6295015000
2.4350019500
2.2440025500
2565035000
1.9680041000
1.8800049000
1.71000060000
1.61240083000
1.5514000100000

Approximate % error due to magnetic fields:

Allen Bradley Resistors:

Field 8 T 14 T
2K 1.5 4
4.2K 3 6
77K 0.5 1.5

Rhodium-Iron Resistors:

Field 1 T 3 T
2K 0.14 0.88
4.2K 0.13 0.79
50K 0.14 0.84


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This page last changed on 16-Feb-2005 14:09:11 UTC by MarkusZolliker.