n3He B-Field Alignment Insights
Explore the alignment of B-fields for n3He with detailed data on fields produced by each shim coil, differences in Bz, reversing polarity on shim coils, alignment of Bx, and a summary of the field strengths. Discover the recommended settings for the left, right, front, and back shims to achieve optimal results.
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Presentation Transcript
Alignment of B-Field for n3He Kabir, Eric, Chris 10/20 10/22
Fields produced by Each Shim Coil (All other shim Coils Off) B-Fields produced by Shim Coils 0.08 0.06 0.04 0.02 Left shim (Bz) y = -0.1044x + 0.0648 B-field (G) Back Shim (Bx) 0 y = -0.0897x + 0.0629 0.400 Right Shim (Bz) 0.000 0.200 0.600 0.800 1.000 1.200 Front Shim (Bx) -0.02 y = -0.0315x - 0.0147 -0.04 y = -0.0331x - 0.0148 -0.06 Current (A)
Alignment of Bz Difference in Bz versus current in Left Shim 0.00500 0.00000 0.000 0.050 0.100 0.150 0.200 0.250 0.300 -0.00500 -0.01000 -0.01500 Bz-Bz' (G) -0.02000 -0.02500 -0.03000 -0.03500 Current (A) Item 1 2 3 4 5 6 7 8 9 10 Bx Bz B'x B'z dBx dBz -0.01731 -0.02946 -0.02296 -0.00916 -0.00648 0.00136 -0.00252 -0.00138 0.00032 -0.00068 Left shim 0.210 0.110 0.193 0.226 0.236 0.256 0.246 0.250 0.253 0.252 Right Shim 0.500 0.400 0.483 0.516 0.526 0.546 0.536 0.540 0.543 0.542 -0.04812 -0.04834 -0.04157 -0.04115 -0.04111 -0.04110 -0.04149 -0.04104 -0.04164 -0.04975 -0.00607 0.01359 -0.00361 -0.01104 -0.01206 -0.01608 -0.01417 -0.01474 -0.01589 -0.01560 0.03438 0.03634 0.03505 0.03179 0.03544 0.03583 0.03523 0.03282 0.03310 0.03364 -0.02338 -0.04305 -0.02657 -0.02020 -0.01854 -0.01472 -0.01669 -0.01612 -0.01557 -0.01628
Reversing Polarity on Shim Coils Front/Back Shim Coils 0.03 0.02 0.01 0 0.000 0.200 0.400 0.600 0.800 1.000 1.200 Front Shim (Rev Polarity) -0.01 Back Shim (Rev Polarity) B-Field (G) Front Shim -0.02 Back Shim -0.03 -0.04 -0.05 -0.06 Current (A)
Alignment of Bx Bx-Bx' vs Current in Back shim 0.00400 0.00200 0.00000 0.000 0.050 0.100 0.150 0.200 -0.00200 Bx -Bx' (G) -0.00400 -0.00600 -0.00800 y = -0.1062x + 0.0067 -0.01000 Current (A) Item 1 2 3 4 5 6 7 8 9 10 Bx Bz B'x B'z dBx -0.00365 -0.00882 0.00298 -0.00242 0.00335 -0.00288 0.00054 -0.00097 -0.00305 0.00000 dBz -0.00088 -0.00046 -0.00077 -0.00064 -0.00117 -0.00107 -0.00028 -0.00132 -0.00113 0.00000 Left shim 0.252 0.252 0.252 0.252 0.252 0.252 0.252 0.252 0.252 0.252 Right Shim 0.542 0.542 0.542 0.542 0.542 0.542 0.542 0.542 0.542 0.542 Back Shim 0.100 0.150 0.050 0.073 0.062 0.065 0.068 0.068 0.068 Front Shim 0.100 0.150 0.050 0.073 0.062 0.065 0.068 0.068 0.068 -0.00535 0.00303 -0.00767 -0.00386 -0.00950 -0.00477 -0.00962 -0.00349 -0.00388 -0.01552 -0.01577 -0.01552 -0.01579 -0.01548 -0.01533 -0.01591 -0.01525 -0.01526 -0.00901 -0.01185 -0.00468 -0.00628 -0.00614 -0.00765 -0.00908 -0.00446 -0.00692 -0.01639 -0.01623 -0.01629 -0.01643 -0.01665 -0.01640 -0.01619 -0.01657 -0.01638
Summary Field at SF: 9.149 G 9.144 G Recommend: Left shim: Right Shim: Front Shim: Back Shim: I= 0.252 A I= 0.542 A I= 0.068 A I=0.068 A
