1. Conventions
   • use BLAST corrdinate system
     
     
   • numbering of coils
     

     serial# Vitaliy# Doug# 001 1 2 003 2 3 006 3 4 010 4 5 009 5 6 004 6 7 008 7 0 007 8 1

   • numbering of measurements
     

     Figure# Ehsan# 1 00 2 70 3 55 4 07 5 45 6 60 7 44 8 06 9 54

   • dx_c=dr, dy_c=dphi, dz_c, pitch, roll and yaw
2. What are the design goals?
3. Being able to read out the field prob.

1. There are 6 degrees of freedom for each coil (dx=dr, dy=dphi, dz, pitch, roll and yaw). With 8 coils, that yields 48 independent degrees of freedom. Although the proposed measurements ( (Bx,By,Bz) along nine lines parrellel to the beam pipe / z-axis) can have hundereds of measurements, these are not independent!
2. Coils may not be shaped as designed, and may not produce the field which TOSCA has assumed.
3. The technique is to look at the difference between a measured field and the TOSCA field and try to figure out how to shift the coils to create the ideal TOSCA field. This may not be completely achivable (See above).

1. To analyse this data we must be driven by the locations where the measurments are, not just where we would like them to be.
   • we may need to extropolate from the TOSCA numbers we precalculated
   • we may need to rerun TOSCA.
2. After we "fit" we may want to re-run TOSCA to see that the TOSCA with misalignment is near to what we measured.
3. If the measurement are fast and adjustments are, and the analysis is slow we would make many small adjustments.

1. First measurment - in the "neck" of the coils, with the table on the down stream edge of the pit. We measure the field in the "neck" region, (about a meter? in z)
   • plot all componets of all nine lines as a function of z. Compare to ideal TOSCA. Inspect by eye.
   • Test which line is the most off?
   • fit.
   • perform a TOSCA calculation with the fitted off sets. The results of this TOSCA should be the same as what was measured.
   • Ajust worst coil (dx, dy, dz)
   • remeasure and refit
2. Second measurement - in the target region
   • maybe with more sensetive probe, which is in only one diemension.
   • like the above, except fit only pitch and yaw.
   • perform a TOSCA calculation with the fitted off sets. The results of this TOSCA should be the same as what was measured.
   • Ajust worst coil (d-pitch, d-yaw)
   • remeasure and refit

Sept 28
Oct 16