Appendix 18. Preliminary Solar Polar Magnet Study

 

A18.3 Data

 

In this section, the data is presented. Further discussion and results are presented in section 18.4.

 

A18.3.1 SST-416/APL

 

For yoke SST-416/APL measurements of the magnetic field intensity were taken at separations of 0.10 inches in three planes (X, Y = +.1, Z), (X, Y = 0, Z) and (X, Y = -.1, Z). The data for Configuration I are presented in Figures A18-4 through A18-6 and for Configuration II in Figures A18-7 through A18-9. In the formats shown, the yoke outline indicates the outside dimensions to scale and the magnet outline is a projection onto the Y = 0 plane. Also shown in this format is the location of the solid-state detector. It can be seen that the peak field in the Y = 0 plane is 1840 Gauss at X = 0.7 inches from the front surface into the yoke.

 

	Figure A18-4 Yoke SST 416/APL, Configuration I, Magnets 1 and 2, Y=+0.1"
	Figure A18-5 Yoke SST 416/APL, Configuration I, Magnets 1 and 2, Y=0
	Figure A18-6 Yoke SST 416/APL, Configuration I, Magnets 1 and 2, Y=-0.1"
	Figure A18-7 Yoke SST 416/APL, Configuration II, Magnets 1 and 2, Y=+0.1"
	Figure A18-8 Yoke SST 416/APL, Configuration II, Magnets 1 and 2, Y=0
	Figure A18-9 Yoke SST 416/APL, Configuration II, Magnets 1 and 2, Y=-0.1"

 

The data is presented in a different format in Figures A18-10 through A18-12 for Configuration I and Figures A18-13 through A18-15 for Configuration II. This format is similar to the Voyager magnet presentations. Again, it can be seen that for Configuration I, the peak field is 1840 Gauss at X = 0.7 inches in the Y = 0 plane, while for configuration II the peak field is 1480 Gauss at X = 0.9 inches from the front plate. In general, the shape of the field intensity curve is similar to that of the Voyager magnets.

 

	Figure A18-10 Yoke SST 416/APL, Configuration I, Magnets 1 and 2, Y=+0.1" , graphical form
	Figure A18-11 Yoke SST 416/APL, Configuration I, Magnets 1 and 2, Y=0, graphical form
	Figure A18-12 Yoke SST 416/APL, Configuration I, Magnets 1 and 2, Y=-0.1", graphical form
	Figure A18-13 Yoke SST 416/APL, Configuration II, Magnets 1 and 2, Y=+0.1", graphical form
	Figure A18-14 Yoke SST 416/APL, Configuration II, Magnets 1 and 2, Y=0, graphical form
	Figure A18-15 Yoke SST 416/APL, Configuration II, Magnets 1 and 2, Y=-0.1", graphical form

 

With this yoke in Configuration I, field intensities were measured along the centerline for different pairs of magnets. This data is presented in tabular form, rather than a graph, in Table A18-1.

 

Table A18-1 Solar Polar Magnetic Field Survey Yoke: SST416/APL (w/o hole). Magnet configuration I. Magnetic field (Gauss)

 

			Magnet Pairs
X (in)	Y (in)	Z (in)	1 & 2	3 & 4	5 & 6	7 & 8
-0.4	0	0	28	28.4	27.8	26.1
-0.3	0	0	44	46.3	45.3	42.0
-0.2	0	0	74	76.9	75.5	69.8
-0.1	0	0	123	126	124	115
0	0	0	204	207	205	189
0.1	0	0	324	332	324	303
0.2	0	0	505	520	508	473
0.3	0	0	770	788	765	714
0.4	0	0	1080	1110	1070	1010
0.5	0	0	1420	1470	1390	1340
0.6	0	0	1720	1780	1660	1630
0.7	0	0	1840	1920	1760	1760
0.8	0	0	1720	1790	1610	1670
0.9	0	0	1330	1390	1210	1310
1.0	0	0	876	905	772	870
1.1	0	0	492	505	423	492
1.2	0	0	242	246	206	246
1.3	0	0	94.5	92.4	76.7	97.5

 

 

A18.3.2 SST-416/UCB

 

Yoke SST-416/UCB is similar to SST-416/APL except that it has a hole in the yoke which could accommodate a detector mount. Measurements of the magnetic field intensity were made only along the yoke centerline for Configuration I, but using the same magnet pair as used for the SST-416/APL yoke measurements. The data is presented in tabular form in Figure A18-16 and in graphical form in Figure A18-17. It can be seen that although the peak fields occur in the same location--0.7 inches from the front surface--the magnitude of SST-416/UCB is only 1750 Gauss compared to 1840 Gauss for SST-416/APL. This is probably due to an increase in leakage flux in the vicinity of the detector mounting hole and thereby a reduction in field in the center of the yoke.

 

	Figure A18-16 Yoke SST 416/UCB, Configuration I, Magnets 1 and 2, Y=0
	Figure A18-17 Yoke SST 416/UCB, Configuration I, Magnets 1 and 2, Y=0, graphical form

 

 

A18.3.3 C49/APL

 

Because of the high value of leakage flux from the stainless steel, a yoke of higher permeability material--Carpenter 49--was constructed. The initial C49 yoke had heavy wall thicknesses and no hole for a detector mount. The only magnetic field intensity measurements for the C49/APL yoke were made along the centerline in Configuration I. This data is presented in Figure A18-18 and in graphical form in Figure A18-19. It can be seen that the peak field value is 1890 Gauss, located at 0.7 inches from the front surface.

 

	Figure A18-18 Carpenter 49/APL, Configuration I, Magnets 1 and 2, Y=0
	Figure A18-19 Carpenter 49/APL, Configuration I, Magnets 1 and 2, Y=0, graphical form

 

 

Next: A18.3.4 C49/Mod I

 

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