SLAC Magnetic Measurements
Date: 10-02-2008
Time: 10:46:30
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 10-02-2008
Time: 10:37:37
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-21
DATASET Number: 2
Tuning Stage: Fine Tuning
Run Number: 15
Measurement Type: Z Scans
Operator: YL
Comment: final scans
Session first run: 12
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-21\DATASET0002\Fine Tuning\Z Scans\Run 015\bscanz.dat
Temperature (C)
L143-112000-21:--> top_end 19.90 --> top_mid 19.92 --> top_start 19.93 --> bottom 19.92 --> Air 19.97 --> Granite 19.91 
Axes position (m) X:0.024646 Y:0.000400
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001729 V
Vy_0i = -0.000526 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001684 V
Vy_0f = -0.000572 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001729 V, increment = -2.133E-09 V
Vy:offset = -0.000526 V, increment = -2.124E-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\L143-112000-21\DATASET0002\Fine Tuning\Z Scans\Run 015\
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 = -0.000008 T
Correction, By additive constant = -0.000001 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26639.810000
Electron energy = 13.612918 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.488542
Nominal radiation wavelength = 1.497499e-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 = -0.000008 T
CORR_BY_ADD = -0.000001 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 = 1.272165 T, RMS = 0.004931 T
Peak Field Spacing: Ave = 0.015000 m, RMS = 0.000022 m
Zero Field Spacing: Ave = 0.015000 m, RMS = 0.000036 m
Average Undulator Period = 0.030000 m

Hall Probe Overall Field Integrals:
Int Bx dz =  -5.1917e-006 Tm
Int Int Bx dz dz =   1.0490e-005 Tm^2
Int By dz =   2.3432e-005 Tm
Int Int By dz dz =   7.4944e-006 Tm^2

Trajectory Exit Information:
X at exit =   1.6505e-007 m
X slope at exit =   5.1604e-007
Y at exit =  -2.3101e-007 m
Y slope at exit =   1.1434e-007

Calculated Undulator Parameters:
Keff = 3.488508
Beff = 1.245359 T
Lambda_rad = 1.497484e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 19.917500 C
Measured Keff = 3.488508
Calculated Keff at 20 C = 3.488364
Relative Change (Keff_20C - Keff) / Keff = -0.000041

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99158e-009
Undulator Period = 0.030000 m
Radiation Wavelength =   1.49748e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, Phase error RMS = 3.666912 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49750e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -1.053850 deg, RMS = 3.700784 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -2.392809 deg, RMS = 3.776161 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = -0.212014 deg, RMS = 2.924090 deg
Cell:
  Phase Change Of Cell =   40676.134 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      -3.866 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 = 19.917500 C
Measured Phase Change Of Cell =   40676.134 deg
Calculated Phase Change Of Cell At 20 C =   40673.252 deg
Phase Change Due To Temperature (Phase_20C - Phase) =      -2.882 deg