**[Laser Tracker Magnet Reference]{.underline}**

**[with All Planes Measured using the API Laser Tracker]{.underline}**

**[and Spatial Analyzer software]{.underline}**

Chuck Wilson and Mike O'Boyle

Fermi National Accelerator Laboratory

Batavia, IL 60510, U.S.A.

> **[Note:]{.underline}** this procedure assumes a freshly calibrated
> Laser Tracker and the instrument is in a good location for measuring
> the component.

1\. A well distributed network of pass points must be located around the
component to be referenced. A minimum of six is desired if they can all
be observed from each instrument location.

2\. Open Spatial Analyzer software.

3\. Create folder named "Beamline_Magnet Ref.". (ex. NuMI_Magnet Ref)

4\. Save file named "Magnet Ser. No.\_Date".

5\. Choose from the task bar, Instrument\>Add.

6\. In the Add Instrument window, highlight the Tracker type and stand
you are using.

7\. Check the Run the Instrument Interface Module box and click Add
Instrument to Job. Dock instrument by clicking on docking button. Home
the instrument.

**[Note:]{.underline}** Begin by measuring the pass points.

8\. Type "Control" into Group box on tracker pad.

9\. Measure desired control points (pass points) with Measurement
Profile set on Two Face.

**[Note:]{.underline}** We will now measure all visible planes.

10\. Type "Name of Plane" into Group box. (ex. DNST)

11\. Type "Name of Plane_1" into Target box. (ex. DNST_1)

12\. Measure a minimum of 4 points on each plane, with Measurement
Profile set on Single Pt To SA on tracker pad, trying to cover as much
of the plane as possible.

13\. After measuring all planes visible from this instrument location,
track to home and check closure by clicking on Check/Cal\>Closure on
task bar. Verify acceptable closure value and click Log and Click OK.
Hit Home, Hit F6 to change face.

**[Note:]{.underline}** It is good practice to continue making closure
checks in this manner throughout the survey.

14\. Re-measure each plane in reverse remembering to enter proper plane
name in Group box and properly incremented point name in Target box.

**[Note:]{.underline}** We will now measure all visible fiducials.

15\. Type "Fids0" in Group box.

16\. Type "Fiducial Name" in Target box. (ex. MagnetSerNo_A)

17\. Reset Measurement Profile to Two Face.

18\. Measure all visible fiducials, remembering to change name in Target
box to corresponding fiducial being measured.

19\. Choose Instrument\>Drift Check.

20\. Double click on Control group.

21\. Type DriftCheck0 in Group To Contained Measured Points box. Hit
Apply.

22\. Measure a minimum of 3 well distributed points in the Control
group.

23\. If results are acceptable, hit Finished-Drift Acceptable. (Note: if
not, set-up may need to be repeated.)

(**[Note:]{.underline}** it is advisable to perform plane fits to
determine if any bad measurements have been taken before moving the
instrument. After checking, hit Cancel as final planes will be built
later.)

24\. Close tracker pad.

25\. Move tracker to new location for measurement of unobserved planes.

26\. Repeat steps 5 through 7.

27\. Locate Instrument by choosing from task bar, Instrument\>Locate
(Transform to Part)\>Measure Nominal Points.

28\. Double click on Instrument 1 when prompted.

29\. Double click on Control group.

30\. Type BFIT1 into Group to Contain Measured Points box and click
Apply.

31\. Measure desired pass points. When complete choose Finished-Locate
Instrument.

32\. Repeat steps 10 through 32 until conditions in 33 are met,
remembering to increment group names so the number matches the
instrument number of the set-up.

**[Note:]{.underline}** this prevents overwriting of measured points
with the same name and allows bundling of the redundant points later.

**[Note:]{.underline}** You can skip 25 through 32 on the last setup.

33\. If all planes are measured and all fiducials have a minimum of two
rays, the measurements are complete.

34\. If these conditions are not met, repeat steps 10 through 32,
remembering to increment the Instrument.

**[Note:]{.underline}** We will now bundle the measurements.

35\. If the conditions in step 32 [are]{.underline} met, choose
Analysis\>Coordinate Uncertainty\>Unified Spatial Metrology Network.

36\. Choose F2, select All in Select Instrument window, select OK.

37\. Select Enter.

38\. Select Exclude Measurements.

39\. Check all points that are not pass-points or fiducials. Also, check
all Drift Checks.

40\. Choose OK.

41\. Choose Yes in Spatial Analyzer window.

42\. Choose Best-Fit then Solve.

43\. In the Apply Results section of the USMN window, type FINAL after
USMN Composite. This names the final bundle.

44\. Choose Apply.

**[Note:]{.underline}** For ease of plane construction, we will create a
Point on Positive frame so that all of the Planer Offsets in the Default
Plane are in the same direction.

45\. On tracker pad, type POP in Group box, and POP1 in Target box.

46\. Choose Single Pt. in Measurement Profile box.

47\. Track the prism to a point on the station face, either upstream or
downstream, of the magnet and near beam centerline. Hit measure.

48\. Measure another point upstream or downstream of the existing magnet
and near centerline, this will be automatically named POP2.

49\. Choose from task bar; Construct\>Frame\>Using Points and Vectors.

50\. Double Click POP1.

51\. In the Primary Axis section of the Frame from Points and Vectors
box, choose Point for Defined by: and +Y or -Y for Axis, depending on
the direction of POP2. Hit Continue.

52\. Double Click POP2.

53\. In the Secondary Axis section of the Frame from Points and Vectors
box, choose Vector for Defined by: and +Z for Axis. Hit Continue.

54\. Double Click the WORLD Frame.

55\. In the Frame window, type POP in the Name: box.

56\. Choose Update.

57\. Choose Make Working.

58\. Choose Transform.

59\. In the Frame Position box, enter the approximate half-size of the
magnet in the Y box. The sign of this value should be opposite the sign
of the Y axis chosen in Step 51. Make sure you use the proper units.

60\. Choose Update.

61\. Close the Frame Position and Frame windows.

**[Note:]{.underline}** There is now an active frame in the approximate
center of the magnet in the proper orientation. You are now ready to
construct the magnet planes.

62\. Choose Construct\>Plane\>Fit to Points from the task bar.

63\. Hit F2 and check all the measurements to one of the planes.

64\. Hit OK. Hit Enter.

65\. In the Plane Fit window, hit the big check box at the top between
the question mark and the Re-Fit button. This is the Default Plane
window. In this window choose Point on Pos. Side in the Normal Direction
section. In the Measured section, choose the proper graphic showing the
SMR location relative to both the plane measured and the normal arrow,
remembering that the normal arrow points toward the origin of the frame.
In the Planer Offset section, make sure that the proper prism radius is
chosen. Hit the Output Parameters and make sure that Make Cardinal Pts.,
Make Offset Pts., and Make Geometry are checked. Hit OK. Choose OK.

66\. OK the Default Plane.

67\. Hit the Re-Fit button.

68\. OK the Plane Fit.

69\. Name the plane in the Group Name for Offset Points in the Input
window. Hit OK.

70\. Do the same for the Group Name for Cardinal Points. Hit OK.

71\. Name the plane in the Plane window. Hit Update. Hit Close.

72\. Repeat steps 62 through 71 for all other measured planes.

**[Note:]{.underline}** We will now construct the 8 magnet corners by 3
plane intersections.

73\. Choose Construct\>Point(s)\>Intersection\>3 Planes from task bar.

74\. Double Click on each of three intersecting planes.

75\. In the Construct New Point window, name the point corresponding to
the three planes chosen. (ex., UP_TOP_LEFT). Also, rename Main to CALCS
in Group box. Hit OK.

76\. Repeat steps 73 through 75 for all 8 corners of a six sided magnet.

**[Note:]{.underline}** We will now construct the 4 mid-points of the
upstream corners and the 4 mid-points of the downstream corners.

77\. Choose Construct\>Point(s)\>Fit to Points from task bar.

78\. Double Click on two opposing corners. Hit enter.

79\. In the Construct New Point window, name the point corresponding to
the two chosen points. (ex., UP_TOP_MID).

80\. Repeat steps 77 through 79 for all 8 midpoints of a six sided
magnet.

**[Note:]{.underline}** We will now build the horizontal and vertical
mid-planes.

81\. Choose Construct\>Plane\>Fit to Points from the task bar.

82\. Hit F2 and check all the corresponding midpoints to make either the
horizontal or vertical mid-plane. (ex. TOP and BOT_MIDs for HORZ_MID
plane, and LEFT and RIGHT_MIDs for VERT_MID plane).

83\. Hit OK. Hit Enter.

84\. In the Plane Fit window, hit the big check box at the top between
the question mark and the Re-Fit button. This is the Default Plane
window. In this window choose Point on Pos. Side in the Normal Direction
section. In the Measured section, choose the proper graphic showing the
SMR location with no offset. The Planer Offset section will have no
affect with this graphic. Hit the Out Parameters and make sure that Make
Cardinal Pts., Make Offset Pts., and Make Geometry are checked. Hit OK.

85\. OK the Default Plane.

86\. Hit the Re-Fit button.

87\. OK the Plane Fit.

88\. Name the plane in the Group Name for Offset Points in the Input
window. Hit OK. (ex. the HORZ_MID).

89\. Do the same for the Group Name for Cardinal Points. Hit OK.

90\. Name the plane in the Plane window. Hit Update. Hit Close.

91\. Repeat steps 81 through 90 for the other mid plane.

**[Note:]{.underline}** We will now construct the magnet centerline.

92\. Choose Construct\>Line\>2 Plane Intersection from task bar.

93\. Double click HORZ_MID plane.

94\. Double click VERT_MID plane.

95\. Type Centerline for Name in Line window. Hit Update. Hit Close.

96\. Choose Construct\>Point(s)\>Intersection\>Line and Plane from task
bar.

97\. Double Click Centerline line and double click Upst plane.

98\. Enter MagnetSerNo_UP for Point Name in Construct New Point window.

99\. Repeat steps 92 through 96 at other end of magnet.

**[Note:]{.underline}** Now construct the origin of the magnet frame.

100\. Choose Construct\>Point\>Fit to Points from task bar.

101\. Double click on MagnetSerNo_UP and MagnetSerNo_DN. Hit enter.

102\. In the Construct New Point window, name the point MagnetSerNo_CT.

**[Note:]{.underline}** We will now construct the MAGNET frame.

103\. Choose Construct\>Frame\>Using Points and Vectors from the task
bar.

104\. Double click on MagnetSerNo_CT point.

105\. In the Primary Axis section of the Frame from Points and Vectors
box, choose Point for Defined by: and +Y for Axis. Hit Continue.

106\. Double Click MagnetSerNo_DN.

107\. In the Secondary Axis section of the Frame from Points and Vectors
box, choose Vector, for Defined by: and +Z or -Z, depending on the
normal direction of measured Z plane, (ex. TOP or BOTTOM), for Axis. Hit
Continue.

108\. Double Click the measured Z plane, (ex. TOP or BOTTOM).

109\. In the Frame window, type MAGNET in the Name box.

110\. Choose Update.

111\. Choose Make Working.

**[Note:]{.underline}** check the direction of the Z vector in the
MAGNET frame. Rotate the frame accordingly by right clicking on MAGNET
frame, choosing properties, choosing Transform, and entering 180 in RY
box of Orientation section of Frame Position window. Close Frame
Position and Frame windows. The Magnet frame is now at the center of the
magnet with the proper axis orientation for giving correct reference
numbers for the magnet fiducials.

112\. Choose Edit\>Group Manager from the task bar.

113\. Click on USMN Composite FINAL group in the left side of the Group
Manager window.

114\. Highlight the magnet fiducials.

115\. Right click in the highlighted area and choose Copy selections
into a New Group.

116\. Type Export in to the Group box in the Rename Object window. Hit
OK.

117\. Click on CALCS group in the left side of the Group Manager window.

118\. Highlight the MagnetSerNo_UP, DN, and CT points.

119\. Right click in the highlighted area and choose copy.

120\. Click on the newly created Export group. Right click and paste the
three magnet points into this group and close Group Manager window.

121\. Right click on Export group name.

122\. Click Export to ASCII File.

123\. Browse to proper folder and type MagnetSerNo_REF.txt in File Name
box of Save As window. Hit Save.

124\. In the ASCII Export window; choose Comma Delineated for the
Separator, Target for the Target Name, and check Include SA version and
working frame comments. Hit OK. Close the Notepad window.

125\. Choose File\>Save.

126\. Choose File\>Backup Now.