SLAC Magnetic Measurements
Date: 04-15-2013
Time: 16:55:31
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 04-15-2013
Time: 16:51:42
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: DELTA
DATASET Number: 1
Tuning Stage: Fine Tuning
Run Number: 43
Measurement Type: Z Scans
Operator: YL
Comment: Q1; #75 down 0.025mm
Session first run: 42
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\DELTA\DATASET0001\Fine Tuning\Z Scans\Run 043\bscanz.dat
Temperature (C)
DELTA:--> T1 19.96 --> T2 20.25 --> T5 19.88 --> T3 19.95 --> Air 20.00 --> T4 19.96 
Axes position (m) X:0.020025 Y:0.000025
Initial Hall Probe Zero Measurements:
Vx_0i = 0.000822 V
Vy_0i = -0.003517 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.000760 V
Vy_0f = -0.003571 V
Offset Correction Voff = offset+index*increment
index = 0,1...8750
Vx:offset = 0.000822 V, increment = -7.178E-09 V
Vy:offset = -0.003517 V, increment = -6.170E-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\DELTA\DATASET0001\Fine Tuning\Z Scans\Run 043\
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 = -0.000020 T
Correction, By additive constant = 0.000035 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26638.000000
Electron energy = 13.611993 Gev
Nominal undulator period = 0.032000 m
Nominal K value = 1.237440
Nominal radiation wavelength = 3.981220e-011 m
Number of undulator poles = 60
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 = 274.889357 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 = 0.000035 T
CORR_BX_ADD_FILE = none
CORR_BY_ADD_FILE = none
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Peak And Zero Field Summary:
Number of Poles = 60
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 0.429911 T, RMS = 0.007709 T
Peak Field Spacing: Ave = 0.016153 m, RMS = 0.000222 m
Zero Field Spacing: Ave = 0.016155 m, RMS = 0.000123 m
Average Undulator Period = 0.032308 m

Hall Probe Overall Field Integrals:
Int Bx dz =   2.5540e-005 Tm
Int Int Bx dz dz =   3.6763e-005 Tm^2
Int By dz =  -2.5451e-005 Tm
Int Int By dz dz =  -1.9143e-005 Tm^2

Trajectory Exit Information:
X at exit =  -4.2161e-007 m
X slope at exit =  -5.6054e-007
Y at exit =  -8.0968e-007 m
Y slope at exit =  -5.6249e-007

Calculated Undulator Parameters:
Keff = 1.318452
Beff = 0.437053 T
Lambda_rad = 4.255227e-011 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 20.010000 C
Measured Keff = 1.318452
Calculated Keff at 20 C = 1.318458
Relative Change (Keff_20C - Keff) / Keff = 0.000004

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   1.31708e-009
Undulator Period = 0.032308 m
Radiation Wavelength =   4.25523e-011 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, Phase error RMS = 5.979588 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   3.98122e-011 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -6372.517775 deg, RMS = 37.024765 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -6108.538344 deg, RMS = 188.018983 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = -6380.548663 deg, RMS = 29.957175 deg
Cell:
  Phase Change Of Cell =   28445.054 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =  -12234.946 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 = 20.010000 C
Measured Phase Change Of Cell =   28445.054 deg
Calculated Phase Change Of Cell At 20 C =   28445.186 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       0.132 deg