SLAC Magnetic Measurements
Date: 03-03-2008
Time: 11:46:06
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 03-03-2008
Time: 11:35:44
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-16
DATASET Number: 1
Tuning Stage: Fine Tuning
Run Number: 2
Measurement Type: Z Scans
Operator: YL
Comment: find Y at min B
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-16\DATASET0001\Fine Tuning\Z Scans\Run 002\bscanz.dat
Temperature (C)
L143-112000-16:--> top_end 19.89 --> top_mid 19.91 --> top_start 19.94 --> bottom 19.91 --> Air 20.00 --> Granite 19.90 
Axes position (m) X:0.029830 Y:0.000425
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001631 V
Vy_0i = -0.000709 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001651 V
Vy_0f = -0.000686 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001631 V, increment = 9.247E-10 V
Vy:offset = -0.000709 V, increment = 1.081E-09 V
Hall Probe Calibration File:
Y: c:\CVI\current_calib\Sentron_441\Sentron_441_y.ini
X: c:\cvi\current_calib\HALLx_calib_poly_fit_file.dat
Reference Magnet Measurements:
Bx_ref = 0.0000xx (T)
By_ref = 0.0000xx (T)
Magnetic Field Measurements vs Z

Analysis Parameters:
Input file directory = S:\MagData\LCLS\Undulator\L143-112000-16\DATASET0001\Fine Tuning\Z Scans\Run 002\
Input file name = x+00000_y+000_bscanz.dat
Input file type = ZVXYBXYH
Correction required = 1
Correction, Bx multiplicative factor = 1.000000 
Correction, By multiplicative factor = 1.000000 
Correction, Bx additive constant = -0.000015 T
Correction, By additive constant = 0.000004 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26660.920000
Electron energy = 13.623705 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.493115
Nominal radiation wavelength = 1.498497e-010 m
Number of undulator poles = 226
Number of end poles (used in analysis) = 4
Cell length = 3.656000 m
Nominal phase change through cell = 709.999940 rad
Nominal phase of pole after end poles = 14.137167 rad
Save as final result = 0
Result file directory = c:\magdata\slac_und_2\
Result file name = zscan_xn0060yp0002.dat
Figures close on exit = 0
Figures visible = 1

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The Measured Fields Were Corrected:
Bx_corr = CORR_BX_MULT * Bx + CORR_BX_ADD + CORR_BX_ADD_FILE
By_corr = CORR_BY_MULT * By + CORR_BY_ADD + CORR_BY_ADD_FILE
Parameters:
CORR_BX_MULT = 1.000000 
CORR_BY_MULT = 1.000000 
CORR_BX_ADD = -0.000015 T
CORR_BY_ADD = 0.000004 T
CORR_BX_ADD_FILE = none
CORR_BY_ADD_FILE = none
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Peak And Zero Field Summary:
Number of Poles = 226
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 1.274257 T, RMS = 0.006248 T
Peak Field Spacing: Ave = 0.015002 m, RMS = 0.000031 m
Zero Field Spacing: Ave = 0.015002 m, RMS = 0.000043 m
Average Undulator Period = 0.030003 m

Hall Probe Overall Field Integrals:
Int Bx dz =   2.4500e-005 Tm
Int Int Bx dz dz =   7.7036e-005 Tm^2
Int By dz =   3.8082e-005 Tm
Int Int By dz dz =   7.0222e-005 Tm^2

Trajectory Exit Information:
X at exit =   1.5453e-006 m
X slope at exit =   8.3801e-007
Y at exit =  -1.6952e-006 m
Y slope at exit =  -5.3913e-007

Calculated Undulator Parameters:
Keff = 3.494263
Beff = 1.247302 T
Lambda_rad = 1.499488e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 19.912500 C
Measured Keff = 3.494263
Calculated Keff at 20 C = 3.494110
Relative Change (Keff_20C - Keff) / Keff = -0.000044

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99781e-009
Undulator Period = 0.030003 m
Radiation Wavelength =   1.49949e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = 0.000000 deg, RMS = 3.954897 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49850e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -0.339518 deg, RMS = 3.837768 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = 9.531085 deg, RMS = 7.841393 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 2.531650 deg, RMS = 5.006560 deg
Cell:
  Phase Change Of Cell =   40702.503 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      22.503 deg

Calculated Phase Change In The Cell At 20 C:
(Relative to the nominal radiation wave)
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 19.912500 C
Measured Phase Change Of Cell =   40702.503 deg
Calculated Phase Change Of Cell At 20 C =   40699.443 deg
Phase Change Due To Temperature (Phase_20C - Phase) =      -3.060 deg