SLAC Magnetic Measurements
Date: 04-18-2008
Time: 11:12:24
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 04-18-2008
Time: 11:08:22
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-31
DATASET Number: 1
Tuning Stage: Fine Tuning
Run Number: 7
Measurement Type: Z Scans
Operator: YL
Comment: final scans
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-31\DATASET0001\Fine Tuning\Z Scans\Run 007\bscanz.dat
Temperature (C)
L143-112000-31:--> top_end 19.93 --> top_mid 19.95 --> top_start 19.97 --> bottom 19.95 --> Air 20.00 --> Granite 19.95 
Axes position (m) X:0.029230 Y:0.000374
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001611 V
Vy_0i = -0.000583 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001590 V
Vy_0f = -0.000630 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001611 V, increment = -1.005E-09 V
Vy:offset = -0.000583 V, increment = -2.236E-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\L143-112000-31\DATASET0001\Fine Tuning\Z Scans\Run 007\
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 = -0.000010 T
Correction, By additive constant = -0.000006 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26629.140000
Electron energy = 13.607466 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.486231
Nominal radiation wavelength = 1.496995e-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 = -0.000010 T
CORR_BY_ADD = -0.000006 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 = 1.271663 T, RMS = 0.006182 T
Peak Field Spacing: Ave = 0.015001 m, RMS = 0.000027 m
Zero Field Spacing: Ave = 0.015001 m, RMS = 0.000041 m
Average Undulator Period = 0.030002 m

Hall Probe Overall Field Integrals:
Int Bx dz =  -4.2466e-005 Tm
Int Int Bx dz dz =   6.3956e-007 Tm^2
Int By dz =   1.3898e-005 Tm
Int Int By dz dz =   8.4410e-007 Tm^2

Trajectory Exit Information:
X at exit =   1.8597e-008 m
X slope at exit =   3.0619e-007
Y at exit =  -1.4091e-008 m
Y slope at exit =   9.3558e-007

Calculated Undulator Parameters:
Keff = 3.486237
Beff = 1.244482 T
Lambda_rad = 1.497090e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 19.950000 C
Measured Keff = 3.486237
Calculated Keff at 20 C = 3.486150
Relative Change (Keff_20C - Keff) / Keff = -0.000025

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99000e-009
Undulator Period = 0.030002 m
Radiation Wavelength =   1.49709e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = 0.000000 deg, RMS = 3.815094 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49699e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = 1.550412 deg, RMS = 5.375765 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -1.068529 deg, RMS = 3.820064 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 0.380571 deg, RMS = 2.324495 deg
Cell:
  Phase Change Of Cell =   40679.792 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      -0.208 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 = 19.950000 C
Measured Phase Change Of Cell =   40679.792 deg
Calculated Phase Change Of Cell At 20 C =   40678.046 deg
Phase Change Due To Temperature (Phase_20C - Phase) =      -1.747 deg