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Feature #1670

Magnetic Axis of FC2, USS and DSS

Added by Blackmore, Victoria over 7 years ago. Updated over 6 years ago.

Status:
Closed
Priority:
Normal
Start date:
08 April 2015
Due date:
% Done:

100%

Estimated time:

Related issues

Follows Analysis - Support #1589: FC1 Magnetic AxisClosedBlackmore, Victoria13 November 2014

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#1

Updated by Blackmore, Victoria over 7 years ago

This issue summarises what we know (so far) about the magnetic axis of FC2, USS and DSS and the cross-checks that have been made.

  • Item #2: FC2 current axis estimates
    • Axis in mapper co-ordinate system
    • Axis w.r.t. fiducials in R9 co-ordinate system
    • Axis w.r.t. PCD
  • Item #3: USS current axis estimates
    • Axis in surveyed co-ordinate system
  • Item #4: DSS current axis estimates
    • Axis in surveyed co-ordinate system
  • Item #5: Method summary
  • Item #6: Alternative axis cross-check using |B|
    ...
#2

Updated by Blackmore, Victoria over 7 years ago

FC2 axis estimates

The mapper was centred and surveyed w.r.t. the centre defined by the inner flanges of the warm bore. This was related to the fiducials by a second survey within the R9 network of survey nests. First determine the axis in the mapper's co-ordinate system, then translate to the R9 network.

  • Define '_z_' as the longitudinal co-ordinate
  • Define '_x_' as the horizontal co-ordinate
  • Define '_y_' as the vertical co-ordinate

Magnetic axis in the mapper system

  • The magnetic axis is assumed to be a straight line (as the coils are wound on a common bobbin), which has the form:
    • x = az + b
    • y = cz + d
  • a and c are rotations around the y and x axes respectively, b and d are offsets.
  • Within the mapper system, the two flanges are at approximately z = 918mm and z = 1762mm (the latter being the side with the inner flange).
  • Have determined the (x, y) co-ordinates of the axis at these locations, and the equation of their lines, at different currents and in Flip and Solenoid mode.
#3

Updated by Blackmore, Victoria over 7 years ago

USS axis estimates

[Placeholder]

#4

Updated by Blackmore, Victoria over 7 years ago

DSS axis estimates

[Placeholder]

#5

Updated by Blackmore, Victoria over 7 years ago

Method summary

[Placeholder]

#6

Updated by Blackmore, Victoria over 7 years ago

Alternative cross-check using |B|

[Placeholder]

#8

Updated by Rogers, Chris over 6 years ago

  • Status changed from In Progress to Closed
  • % Done changed from 50 to 100

I think this is closed... can reopen a new issue after the realignment work done in Feb

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