SLAC Magnetic Measurements
Date: 07-21-2008
Time: 18:56:24
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 07-21-2008
Time: 18:35:07
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-38
DATASET Number: 1
Tuning Stage: Rough Tuning
Run Number: 79
Measurement Type: Z Scans
Operator: aw
Comment: f.p. 0.371967, x=0.026487  y=0.00027773. 
Measurement Device x: 
Measurement Device y: SENIS_24-06
Data File: s:\magdata\LCLS\Undulator\L143-112000-38\DATASET0001\Rough Tuning\Z Scans\Run 079\bscanz.dat
Temperature (C)
L143-112000-38:--> top_start 20.08 --> top_mid 20.09 --> top_end 19.95 --> bot 20.07 --> granite 20.01 --> Air 19.93 
Axes position (m) X:0.026487 Y:0.000277
Initial Hall Probe Zero Measurements:
Vx_0i = -0.000498 V
Vy_0i = -0.000267 V
Final Hall Probe Zero Measurements:
Vx_0f = -0.000451 V
Vy_0f = -0.000255 V
Offset Correction Voff = offset+index*increment
index = 0,1...19850
Vx:offset = -0.000498 V, increment = 2.346E-09 V
Vy:offset = -0.000267 V, increment = 5.910E-10 V
Hall Probe Calibration File:
Y: C:\CVI\current_calib\SENIS_24-06\SENIS_24-06_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\Rough Tuning\Z Scans\Run 079\
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 = 0.000015 T
Correction, By additive constant = 0.000000 T
Correction Bxy additive file = S:\Magdata\Earth Field Correction\earth_field_corr.dat
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 = 0.000015 T
CORR_BY_ADD = 0.000000 T
CORR_BX_ADD_FILE = S:\Magdata\Earth Field Correction\earth_field_corr.dat
CORR_BY_ADD_FILE = S:\Magdata\Earth Field Correction\earth_field_corr.dat
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Peak And Zero Field Summary:
Number of Poles = 226
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 1.272163 T, RMS = 0.005272 T
Peak Field Spacing: Ave = 0.014999 m, RMS = 0.000021 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 =  -3.7934e-005 Tm
Int Int Bx dz dz =   2.2530e-005 Tm^2
Int By dz =   4.3504e-005 Tm
Int Int By dz dz =  -7.3272e-006 Tm^2

Trajectory Exit Information:
X at exit =  -1.6134e-007 m
X slope at exit =   9.5793e-007
Y at exit =  -4.9609e-007 m
Y slope at exit =   8.3528e-007

Calculated Undulator Parameters:
Keff = 3.489522
Beff = 1.245777 T
Lambda_rad = 1.497680e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 20.047500 C
Measured Keff = 3.489522
Calculated Keff at 20 C = 3.489605
Relative Change (Keff_20C - Keff) / Keff = 0.000024

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99246e-009
Undulator Period = 0.029999 m
Radiation Wavelength =   1.49768e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = 0.000000 deg, RMS = 4.238156 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 = 2.049600 deg, RMS = 2.943912 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -1.021560 deg, RMS = 4.299216 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 0.501135 deg, RMS = 4.373974 deg
Cell:
  Phase Change Of Cell =   40679.136 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      -0.864 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 = 20.047500 C
Measured Phase Change Of Cell =   40679.136 deg
Calculated Phase Change Of Cell At 20 C =   40680.795 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       1.660 deg