SLAC Magnetic Measurements
Date: 07-22-2008
Time: 11:04:16
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 07-22-2008
Time: 10:50:03
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-38
DATASET Number: 1
Tuning Stage: Rough Tuning
Run Number: 82
Measurement Type: Z Scans
Operator: aw
Comment: f.p. 0.371967, x=0.026487  y=0.00027773.  1/2 turn out at 19 x-shims.
Measurement Device x: 
Measurement Device y: SENIS_24-06
Data File: s:\magdata\LCLS\Undulator\L143-112000-38\DATASET0001\Rough Tuning\Z Scans\Run 082\bscanz.dat
Temperature (C)
L143-112000-38:--> top_start 20.06 --> top_mid 20.06 --> top_end 19.95 --> bot 20.04 --> granite 19.98 --> Air 19.94 
Axes position (m) X:0.026487 Y:0.000278
Initial Hall Probe Zero Measurements:
Vx_0i = -0.000416 V
Vy_0i = -0.000402 V
Final Hall Probe Zero Measurements:
Vx_0f = -0.000431 V
Vy_0f = -0.000393 V
Offset Correction Voff = offset+index*increment
index = 0,1...19850
Vx:offset = -0.000416 V, increment = -7.332E-10 V
Vy:offset = -0.000402 V, increment = 4.435E-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 082\
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 = 1.272154 T, RMS = 0.005289 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 =  -6.6138e-005 Tm
Int Int Bx dz dz =  -6.8037e-005 Tm^2
Int By dz =   7.7059e-005 Tm
Int Int By dz dz =   7.9839e-005 Tm^2

Trajectory Exit Information:
X at exit =   1.7580e-006 m
X slope at exit =   1.6968e-006
Y at exit =   1.4981e-006 m
Y slope at exit =   1.4563e-006

Calculated Undulator Parameters:
Keff = 3.489521
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 = 20.027500 C
Measured Keff = 3.489521
Calculated Keff at 20 C = 3.489569
Relative Change (Keff_20C - Keff) / Keff = 0.000014

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 = 4.350476 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 = 2.092267 deg, RMS = 3.023385 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -1.737819 deg, RMS = 4.417934 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 0.833600 deg, RMS = 4.054720 deg
Cell:
  Phase Change Of Cell =   40679.224 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      -0.776 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 = 20.027500 C
Measured Phase Change Of Cell =   40679.224 deg
Calculated Phase Change Of Cell At 20 C =   40680.185 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       0.961 deg