SLAC Magnetic Measurements
Date: 04-18-2008
Time: 14:00:27
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 01-14-2008
Time: 09:42:36
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-37
DATASET Number: 2
Tuning Stage: Fine Tuning
Run Number: 3
Measurement Type: Z Scans
Operator: YL
Comment: find Y at min B
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-37\DATASET0002\Fine Tuning\Z Scans\Run 003\bscanz.dat
Temperature (C)
L143-112000-37:--> top_end 19.87 --> top_mid 19.88 --> top_start 19.90 --> bottom 19.88 --> Air 19.93 --> Granite 19.87 
Axes position (m) X:0.030316 Y:0.000269
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001712 V
Vy_0i = -0.000724 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001671 V
Vy_0f = -0.000737 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001712 V, increment = -1.965E-09 V
Vy:offset = -0.000724 V, increment = -6.188E-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\L143-112000-37\DATASET0002\Fine Tuning\Z Scans\Run 003\
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 = -0.000018 T
Correction, By additive constant = 0.000007 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26656.830000
Electron energy = 13.621615 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.492230
Nominal radiation wavelength = 1.498305e-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 = -0.000018 T
CORR_BY_ADD = 0.000007 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 = 1.273311 T, RMS = 0.004778 T
Peak Field Spacing: Ave = 0.015001 m, RMS = 0.000022 m
Zero Field Spacing: Ave = 0.015001 m, RMS = 0.000050 m
Average Undulator Period = 0.030001 m

Hall Probe Overall Field Integrals:
Int Bx dz =  -3.8361e-005 Tm
Int Int Bx dz dz =  -4.4577e-005 Tm^2
Int By dz =   5.3822e-005 Tm
Int Int By dz dz =   9.8490e-005 Tm^2

Trajectory Exit Information:
X at exit =   2.1676e-006 m
X slope at exit =   1.1845e-006
Y at exit =   9.8107e-007 m
Y slope at exit =   8.4426e-007

Calculated Undulator Parameters:
Keff = 3.492412
Beff = 1.246707 T
Lambda_rad = 1.498505e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 19.882500 C
Measured Keff = 3.492412
Calculated Keff at 20 C = 3.492207
Relative Change (Keff_20C - Keff) / Keff = -0.000059

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99480e-009
Undulator Period = 0.030001 m
Radiation Wavelength =   1.49850e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = 0.000000 deg, RMS = 4.514843 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49830e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -0.077521 deg, RMS = 3.552553 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = 3.546154 deg, RMS = 4.776743 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 0.388662 deg, RMS = 4.253034 deg
Cell:
  Phase Change Of Cell =   40685.742 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =       5.742 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 = 19.882500 C
Measured Phase Change Of Cell =   40685.742 deg
Calculated Phase Change Of Cell At 20 C =   40681.635 deg
Phase Change Due To Temperature (Phase_20C - Phase) =      -4.107 deg