"Position" knobs are calibrated in microns, so values listed correspond to a position change of 1 um. Similarly; "angle" knobs are calibrated in microradians. Coefficients listed are as of January 2005.
| HER XCOR 6162 | HER XCOR 7045 | HER XCOR 8020 | HER XCOR 9022 | HER YCOR 7030 | HER YCOR 7052 | HER YCOR 8012 | HER YCOR 8032 | |
|---|---|---|---|---|---|---|---|---|
| HER IP X POS | 2.060e-5 | 1.854e-5 | 1.865e-5 | 1.715e-5 | -0.001e-5 | -0.544e-5 | 0.780e-5 | -0.176e-5 |
| HER IP XANG | -5.438e-5 | 0.777e-5 | -0.675e-5 | 5.057e-5 | 0.149e-5 | -0.217e-5 | -0.042e-5 | -0.132e-5 |
| HER IP YPOS | -0.196e-5 | 0.054e-5 | -0.250e-5 | 0.131e-5 | -0.180e-5 | 14.390e-5 | 14.342e-5 | -0.483e-5 |
| HER IP YANG | -0.179e-5 | 0.065e-5 | 0.066e-5 | -0.235e-5 | -1.280e-5 | -0.397e-5 | 0.186e-5 | 1.496e-5 |
| LER XCOR 2081 | LER XCOR 2187 | LER XCOR 3027 | LER XCOR 3144 | LER YCOR 2186 | LER YCOR 2202 | LER YCOR 3024 | LER YCOR 3040 | |
|---|---|---|---|---|---|---|---|---|
| LER IP X POS | -0.682e-5 | 1.524e-5 | 1.459e-5 | -0.629e-5 | 1.969e-5 | -3.735e-5 | 4.016e-5 | -1.831e-5 |
| LER IP XANG | -1.450e-5 | -0.038e-5 | -0.164e-5 | 1.358e-5 | 0.756e-5 | -1.357e-5 | -1.614e-5 | 0.442e-5 |
| LER IP YPOS | 0.165e-5 | 0.725e-5 | -1.882e-5 | -0.335e-5 | -14.45e-5 | 28.63e-5 | 27.93e-5 | -13.69e-5 |
| LER IP YANG | -0.141e-5 | -0.137e-5 | -0.171e-5 | -0.224e-5 | 1.670e-5 | -0.751e-5 | 0.838e-5 | -0.168e-5 |
Note these coefficients are tuned empirically and do change from time to time due to changes in IP lattice (for instance a beta* change which is implemented using lattice elements within the range of these knobs). "Tuning" entails checking and correcting for closure, crosstalk between ordinates, and accuracy of scale.