SLAC Magnetic Measurements
Date: 09-05-2008
Time: 10:51:07
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 09-05-2008
Time: 10:44:55
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-38
DATASET Number: 1
Tuning Stage: Fine Tuning
Run Number: 14
Measurement Type: Z Scans
Operator: YL
Comment: final scans
Session first run: 11
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-38\DATASET0001\Fine Tuning\Z Scans\Run 014\zscan.dat
Temperature (C)
L143-112000-38:--> top_end 19.91 --> top_mid 19.91 --> top_start 19.94 --> bottom 19.91 --> Air 19.98 --> Granite 19.91 
Axes position (m) X:0.024920 Y:0.000403
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001836 V
Vy_0i = -0.000610 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001776 V
Vy_0f = -0.000623 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001836 V, increment = -2.827E-09 V
Vy:offset = -0.000610 V, increment = -5.835E-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\L143-112000-38\DATASET0001\Fine Tuning\Z Scans\Run 014\
Input file name = x+00000_y+000_zscan.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 = -0.000002 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26644.120000
Electron energy = 13.615120 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.489476
Nominal radiation wavelength = 1.497703e-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 = -0.000002 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 = 1.272248 T, RMS = 0.005326 T
Peak Field Spacing: Ave = 0.014999 m, RMS = 0.000020 m
Zero Field Spacing: Ave = 0.015000 m, RMS = 0.000045 m
Average Undulator Period = 0.029999 m

Hall Probe Overall Field Integrals:
Int Bx dz =  -4.7776e-005 Tm
Int Int Bx dz dz =  -1.1788e-005 Tm^2
Int By dz =   8.7783e-006 Tm
Int Int By dz dz =  -6.0323e-006 Tm^2

Trajectory Exit Information:
X at exit =  -1.3283e-007 m
X slope at exit =   1.9329e-007
Y at exit =   2.5957e-007 m
Y slope at exit =   1.0520e-006

Calculated Undulator Parameters:
Keff = 3.489471
Beff = 1.245740 T
Lambda_rad = 1.497665e-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 = 3.489471
Calculated Keff at 20 C = 3.489327
Relative Change (Keff_20C - Keff) / Keff = -0.000041

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99233e-009
Undulator Period = 0.029999 m
Radiation Wavelength =   1.49767e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, RMS = 4.039499 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49770e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = 0.859696 deg, RMS = 3.872343 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -1.158322 deg, RMS = 4.153408 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 0.559076 deg, RMS = 3.928608 deg
Cell:
  Phase Change Of Cell =   40677.142 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      -2.858 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 =   40677.142 deg
Calculated Phase Change Of Cell At 20 C =   40674.259 deg
Phase Change Due To Temperature (Phase_20C - Phase) =      -2.882 deg