SLAC Magnetic Measurements
Date: 02-16-2011
Time: 13:26:56
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 02-16-2011
Time: 13:10:20
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: EPU
DATASET Number: 1
Tuning Stage: Rough Tuning
Run Number: 341
Measurement Type: Z Scans
Operator: YL
Comment: check K stability around L/4; gap=25mm;  L = 0.28; run 4
Session first run: 320
Measurement Device x: 
Measurement Device y: SENIS_24-06
Data File: s:\magdata\LCLS\Undulator\EPU\DATASET0001\Rough Tuning\Z Scans\Run 341\bscanz.dat
Temperature (C)
Axes position (m) X:0.030864 Y:0.000217
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001055 V
Vy_0i = 0.001052 V
Vz_0i = 0.000000 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001093 V
Vy_0f = 0.001028 V
Vz_0f = 0.000000 V
Offset Correction Voff = offset+index*increment
index = 0,1...20600
Vx:offset = 0.001055 V, increment = 1.808E-09 V
Vy:offset = 0.001052 V, increment = -1.193E-09 V
Vz:offset = 0.000000 V, increment = 0.000E+00 V
Hall Probe Calibration File:
Y: C:\CVI\current_calib\SENIS_24-06\SENIS_24-06_y.ini
X: c:\cvi\current_calib\HALLx_calib_poly_fit_file.dat
Z: c:\cvi\current_calib\HALLz_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\EPU\DATASET0001\Rough Tuning\Z Scans\Run 341\
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 = -0.000358 T
Correction, By additive constant = 0.000060 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26686.340000
Electron energy = 13.636695 Gev
Nominal undulator period = 0.056900 m
Nominal K value = 2.348000
Nominal radiation wavelength = 1.500699e-010 m
Number of undulator poles = 131
Number of end poles (used in analysis) = 4
Cell length = 3.698500 m
Nominal phase change through cell = 408.407045 rad
Nominal phase of pole after end poles = 12.566371 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 = -0.000358 T
CORR_BY_ADD = 0.000060 T
CORR_BX_ADD_FILE = none
CORR_BY_ADD_FILE = none
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Peak And Zero Field Summary:
Number of Poles = 131
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 0.291386 T, RMS = 0.005316 T
Peak Field Spacing: Ave = 0.028519 m, RMS = 0.000059 m
Zero Field Spacing: Ave = 0.028518 m, RMS = 0.000058 m
Average Undulator Period = 0.057037 m

Hall Probe Overall Field Integrals:
Int Bx dz =   5.0293e-004 Tm
Int Int Bx dz dz =   1.0012e-003 Tm^2
Int By dz =   2.8479e-004 Tm
Int Int By dz dz =   1.3090e-004 Tm^2

Trajectory Exit Information:
X at exit =   2.8778e-006 m
X slope at exit =   6.2610e-006
Y at exit =  -2.2012e-005 m
Y slope at exit =  -1.1057e-005

Calculated Undulator Parameters:
Keff = 1.575271
Beff = 0.295784 T
Lambda_rad = 8.973124e-011 m

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   1.57320e-009
Undulator Period = 0.057037 m
Radiation Wavelength =   8.97312e-011 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = 0.000000 deg, RMS = 42.618795 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.50070e-010 m
Cell Length = 3.698500 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -652.339155 deg, RMS = 237.571688 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -4802.824948 deg, RMS = 2580.007431 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = -607.760225 deg, RMS = 220.134608 deg
Cell:
  Phase Change Of Cell =   13909.486 deg
  Nominal Phase Change Of Cell =   23400.000 deg
  Phase Error Of Cell =   -9490.514 deg