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JSPWiki v2.0.52


Difference between version 3 and version 2:
Lines 428-430 were replaced by line 428
-
- ''Carbon resistors for lambda point refrigerator (Ohm):''
-
+ ||Carbon resistors for lambda point refrigerator
Lines 438-449 were replaced by line 436
- Energisation Rate
-
- Symmetric Errergisation:
-
- Energisation Current (A)
- Energisation Rate (A/min)
-
- 0 to 75
- 3.0
-
- 75 to 90
- 2.0
+ ''Energisation Rate''
Lines 451-452 were replaced by line 438
- 90 to 100.75
- 1.0
+ Symmetric Energisation:
Lines 454-456 were replaced by lines 440-444
- 100.75 to 113.34
- Important, only at 2.2 K!
- 0.5
+ ||Energisation Current (A)||Energisation Rate (A/min)
+ | 0 to 75 |3.0
+ |75 to 90 |2.0
+ |90 to 100.75|1.0
+ |100.75 to 113.34\\''Important: only at 2.2 K!''|0.5
Lines 460-461 were replaced by lines 448-450
- Energisation Current (A)
- Energisation Rate (A/min)
+ ||Energisation Current (A)||Energisation Rate (A/min)
+ |0 to 75 |5.0
+ |75 to 91.35|2.0
Lines 463-464 were replaced by line 452
- 0 to 75
- 5.0
+ ''Achieving Persistent Mode''
Removed lines 466-470
- 75 to 91.35
- 2.0
-
- Achieving Persistent Mode
-
Lines 473-474 were replaced by line 456
-
- For TAS7 users:
+ ''For TAS7 users:''
Removed line 478
-
Lines 481-578 were replaced by lines 462-478
- Temperature as measured
- by carbon resistor sensors
- (k ohms) (Allen Bradley)
- Approximate time after starting operation (minutes)
- Pressure (mbar)
-
- R1
- R2
- R3
- R4
-  
-  
-
- 0.976
- 1.021
- 1.015
- 1.062
- 0
- 1000
-
- 0.976
- 1.022
- 1.153
- 1.311
- 10
- 45
-
- 0.981
- 1.448
- .1343
- 1.492
- 20
- 40
-
- 0.989
- 1.670
- 1.568
- 1.721
- 30
- 40
-
- 1.015
- 1.997
- 1.900
- 2.051
- 40
- 30
-
- 1.100
- 2.860
- 2.595
- 2.780
- 50
- 30
-
- 1.097
- 3.252
- 3.140
- 3.272
- 60
- 30
-
- 1.190
- 4.075
- 4.115
- 4.321
- 70
- 30
-
- 3.840
- 4.080
- 4.390
- 5.130
- 80
- 30
-
- Start to energize magnet
- from 8 T to 9 T.
-  
-  
-
- 3.850
- 4.090
- 4.420
- 5.640
- 115
- 30
-
- 9 Tesla achieved
-  
-  
-
- 3.860
- 4.100
- 4.440
- 5.930
-  
-  
+ Resitance values of carbon resistors
+
+ ||R1\\(kOhm)||R2\\(kOhm)||R3\\(kOhm)||R4\\(kOhm)|approximate\\time after starting\\operation (min.)|Pressure (mbar)
+ |0.976|1.021|1.015|1.062|0|1000
+ |0.976|1.022|1.153|1.311|10|45
+ |0.981|1.448|.1343|1.492|20|40
+ |0.989|1.670|1.568|1.721|30|40
+ |1.015|1.997|1.900|2.051|40|30
+ |1.100|2.860|2.595|2.780|50|30
+ |1.097|3.252|3.140|3.272|60|30
+ |1.190|4.075|4.115|4.321|70|30
+ |3.840|4.080|4.390|5.130|80|30
+ | | | | | |Start to energize magnet\\from 8 T to 9 T.
+ |3.850|4.090|4.420|5.640|115|30
+ | | | | | |9 Tesla achieved
+ |3.860|4.100|4.440|5.930| |
+  
Lines 582-894 were replaced by lines 482-578
- Useful helium capacity: 45 litres
- Nitrogen capacity: 43 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
- (The boil off can rise to 750 cc/hr when full current is in the leads).
-
- 1. Allen-Bradley and Rhodium-iron Temperature Sensor Characteristics
-
- (a). Typical values of temperature versus resistance for an Allen-Bradley carbon resistor with nominal resistance at room temperature of 100 ohms and 270 ohms.
-
- (b). Typical values of resistance versus temperature for a 4-wire Rhodium Iron sensor with a nominal resistance of 27 ohms at 273 Kelvin.
-
- (c). 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 Resistance (W)
- Rhodium-lron sensor (W)
-
- 500
- 475
- 425
- 373
- 323
- 300
- 280
- 260
- 240
- 220
- 200
- 190
- 180
- 170
- 160
- 150
- 140
- 130
- 120
- 110
- 100
- 95
- 90
- 85
- 80
- 75
- 70
- 65
- 60
- 55
- 50
- 45
- 40
- 35
- 30
- 28
- 26
- 24
- 22
- 20
- 18
- 16
- 14
- 12
- 10
- 9
- 8
- 7
- 6
- 5.5
- 4.5
- 4.2
- 4
- 3.75
- 3.5
- 3.25
- 3
- 2.8
- 2.6
- 2.4
- 2.2
- 2
- 1.9
- 1.8
- 1.7
- 1.6
- 1.55
- -
- -
- -
- -
- -
- 100
- 100.5
- 101
- 102
- 103
- 104
- 104.5
- 105
- 106
- 107
- 108
- 109
- 110
- 112
- 114
- 116
- 117
- 118
- 120
- 122
- 124
- 126
- 128
- 131
- 135
- 140
- 145
- 150
- 158
- 170
- 175
- 180
- 190
- 200
- 210
- 225
- 241
- 269
- 300
- 350
- 390
- 440
- 520
- 625
- 700
- 950
- 1050
- 1150
- 1300
- 1500
- 1700
- 2100
- 2400
- 2950
- 3500
- 4400
- 5650
- 6800
- 8000
- 10000
- 12400
- 14000
- -
- -
- -
- -
- -
- 270
- 273
- 276
- 280
- 285
- 290
- 293
- 296
- 299
- 304
- 309
- 314
- 320
- 326
- 334
- 343
- 348
- 354
- 360
- 367
- 375
- 384
- 395
- 407
- 420
- 435
- 455
- 485
- 520
- 560
- 580
- 610
- 640
- 680
- 730
- 790
- 860
- 980
- 1120
- 1350
- 1510
- 1770
- 2170
- 2700
- 3100
- 4500
- 5000
- 5500
- 6200
- 7100
- 8400
- 10000
- 12300
- 15000
- 19500
- 25500
- 35000
- 41000
- 49000
- 60000
- 83000
- 100000
- 51.4
- 48.2
- 42.8
- 37.5
- 32.2
- 29.8
- 27.8
- 25.7
- 23.74
- 21.73
- 19.69
- 18.67
- 7.66
- 16.64
- 15.87
- 14.53
- 13.46
- 12.37
- 11.38
- 10.24
- 9.20
- 8.70
- 8.18
- 7.68
- 7.19
- 6.72
- 6.27
- 5.82
- 5.43
- 5.05
- 4.73
- 4.43
- 4.17
- 3.94
- 3.75
- 3.67
- 3.60
- 3.53
- 3.45
- 3.36
- 3.28
- 3.18
- 3.07
- 2.95
- 2.81
- 2.73
- 2.65
- 2.56
- 2.45
- 2.40
- 2.28
- 2.25
- 2.22
- 2.19
- 2.16
-
- Approximate % error due to magnetic fields:
-
-
- Sensor
- Allen-Bradley Resistor
- Rhodium-iron
-
- Field
- 2K
- 4.2K
- 50K
- 77K
-
- 0.5
- 0.5
- -
- 0.1
- 8T
- 1.5
- 3
- -
- 0.5
- 14T
- 4
- 6
- -
- 1.5
- 1T
- 0.13
- 0.13
- 0.14
- -
- 3T
- 0.88
- 0.79
- 0.84
- -
+ |Useful helium capacity|45 litres
+ |Nitrogen capacity|43 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
+
+ ''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
+ |300|100|270|29.8
+ |280|100.5|273|27.8
+ |260|101|276|25.7
+ |240|102|280|23.74
+ |220|103|285|21.73
+ |200|104|290|19.69
+ |190|104.5|293|18.67
+ |180|105|296|7.66
+ |170|106|299|16.64
+ |160|107|304|15.87
+ |150|108|309|14.53
+ |140|109|314|13.46
+ |130|110|320|12.37
+ |120|112|326|11.38
+ |110|114|334|10.24
+ |100|116|343|9.2
+ |95|117|348|8.7
+ |90|118|354|8.18
+ |85|120|360|7.68
+ |80|122|367|7.19
+ |75|124|375|6.72
+ |70|126|384|6.27
+ |65|128|395|5.82
+ |60|131|407|5.43
+ |55|135|420|5.05
+ |50|140|435|4.73
+ |45|145|455|4.43
+ |40|150|485|4.17
+ |35|158|520|3.94
+ |30|170|560|3.75
+ |28|175|580|3.67
+ |26|180|610|3.6
+ |24|190|640|3.53
+ |22|200|680|3.45
+ |20|210|730|3.36
+ |18|225|790|3.28
+ |16|241|860|3.18
+ |14|269|980|3.07
+ |12|300|1120|2.95
+ |10|350|1350|2.81
+ |9|390|1510|2.73
+ |8|440|1770|2.65
+ |7|520|2170|2.56
+ |6|625|2700|2.45
+ |5.5|700|3100|2.4
+ |4.5|950|4500|2.28
+ |4.2|1050|5000|2.25
+ |4|1150|5500|2.22
+ |3.75|1300|6200|2.19
+ |3.5|1500|7100|2.16
+ |3.25|1700|8400|
+ |3|2100|10000|
+ |2.8|2400|12300|
+ |2.6|2950|15000|
+ |2.4|3500|19500|
+ |2.2|4400|25500|
+ |2|5650|35000|
+ |1.9|6800|41000|
+ |1.8|8000|49000|
+ |1.7|10000|60000|
+ |1.6|12400|83000|
+ |1.55|14000|100000|
+
+ ''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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