SLAC Magnetic Measurements
Date: 06-11-2008
Time: 15:46:11
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 06-11-2008
Time: 15:38:13
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-29
DATASET Number: 2
Tuning Stage: Fine Tuning
Run Number: 2
Measurement Type: Z Scans
Operator: YL
Comment: find Y at min K
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-29\DATASET0002\Fine Tuning\Z Scans\Run 002\bscanz.dat
Temperature (C)
L143-112000-29:--> top_end 20.07 --> top_mid 20.06 --> top_start 20.06 --> bottom 20.06 --> Air 20.04 --> Granite 20.07 
Axes position (m) X:0.029000 Y:0.000450
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001671 V
Vy_0i = -0.000648 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001632 V
Vy_0f = -0.000676 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001671 V, increment = -1.876E-09 V
Vy:offset = -0.000648 V, increment = -1.288E-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\L143-112000-29\DATASET0002\Fine Tuning\Z Scans\Run 002\
Input file name = x+00000_y+100_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 = -0.000005 T
Correction, By additive constant = -0.000005 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26637.770000
Electron energy = 13.611876 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.488099
Nominal radiation wavelength = 1.497402e-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 = -0.000005 T
CORR_BY_ADD = -0.000005 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 = 1.272439 T, RMS = 0.005846 T
Peak Field Spacing: Ave = 0.015001 m, RMS = 0.000025 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 =  -1.3487e-004 Tm
Int Int Bx dz dz =  -2.8870e-004 Tm^2
Int By dz =  -9.8040e-006 Tm
Int Int By dz dz =  -3.8326e-005 Tm^2

Trajectory Exit Information:
X at exit =  -8.4410e-007 m
X slope at exit =  -2.1593e-007
Y at exit =   6.3584e-006 m
Y slope at exit =   2.9704e-006

Calculated Undulator Parameters:
Keff = 3.489173
Beff = 1.245538 T
Lambda_rad = 1.498274e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 20.062500 C
Measured Keff = 3.489173
Calculated Keff at 20 C = 3.489282
Relative Change (Keff_20C - Keff) / Keff = 0.000031

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99398e-009
Undulator Period = 0.030002 m
Radiation Wavelength =   1.49827e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, RMS = 4.448228 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49740e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -0.393987 deg, RMS = 6.426190 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = 8.319581 deg, RMS = 7.577548 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 4.450075 deg, RMS = 3.299664 deg
Cell:
  Phase Change Of Cell =   40709.065 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      29.065 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 = 20.062500 C
Measured Phase Change Of Cell =   40709.065 deg
Calculated Phase Change Of Cell At 20 C =   40711.251 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       2.185 deg