SLAC Magnetic Measurements
Date: 03-19-2008
Time: 09:39:30
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 03-19-2008
Time: 09:33:21
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-30
DATASET Number: 1
Tuning Stage: Fine Tuning
Run Number: 9
Measurement Type: Z Scans
Operator: YL
Comment: find Y at min K
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-30\DATASET0001\Fine Tuning\Z Scans\Run 009\bscanz.dat
Temperature (C)
L143-112000-30:--> top_end 19.96 --> top_mid 20.02 --> top_start 20.02 --> bottom 20.00 --> Air 20.05 --> Granite 19.97 
Axes position (m) X:0.029590 Y:0.000515
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001650 V
Vy_0i = -0.000782 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001602 V
Vy_0f = -0.000791 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001650 V, increment = -2.258E-09 V
Vy:offset = -0.000782 V, increment = -4.410E-10 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\L143-112000-30\DATASET0001\Fine Tuning\Z Scans\Run 009\
Input file name = x+00000_y+100_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 = -0.000020 T
Correction, By additive constant = -0.000004 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26682.250000
Electron energy = 13.634605 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.497737
Nominal radiation wavelength = 1.499506e-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 = -0.000020 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 = 1.275900 T, RMS = 0.006808 T
Peak Field Spacing: Ave = 0.015001 m, RMS = 0.000027 m
Zero Field Spacing: Ave = 0.015002 m, RMS = 0.000047 m
Average Undulator Period = 0.030002 m

Hall Probe Overall Field Integrals:
Int Bx dz =  -1.4225e-004 Tm
Int Int Bx dz dz =  -2.3161e-004 Tm^2
Int By dz =   6.0969e-006 Tm
Int Int By dz dz =  -3.0859e-005 Tm^2

Trajectory Exit Information:
X at exit =  -6.7851e-007 m
X slope at exit =   1.3406e-007
Y at exit =   5.0926e-006 m
Y slope at exit =   3.1276e-006

Calculated Undulator Parameters:
Keff = 3.498890
Beff = 1.248993 T
Lambda_rad = 1.500455e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 20.000000 C
Measured Keff = 3.498890
Calculated Keff at 20 C = 3.498890
Relative Change (Keff_20C - Keff) / Keff = 0.000000

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   5.00119e-009
Undulator Period = 0.030002 m
Radiation Wavelength =   1.50046e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = 0.000000 deg, RMS = 4.674164 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49951e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -0.641271 deg, RMS = 6.074609 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = 8.905421 deg, RMS = 8.082435 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 4.563603 deg, RMS = 4.555682 deg
Cell:
  Phase Change Of Cell =   40705.635 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      25.635 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 = 20.000000 C
Measured Phase Change Of Cell =   40705.635 deg
Calculated Phase Change Of Cell At 20 C =   40705.635 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       0.000 deg