SLAC Magnetic Measurements
Date: 08-22-2014
Time: 14:49:39
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 08-22-2014
Time: 14:42:53
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: DELTA
DATASET Number: 4
Tuning Stage: Fine Tuning
Run Number: 5
Measurement Type: Z Scans
Operator: YL
Comment: magnet #164,218 moved -2, #234 -4, #238,242,246 -3 #84 flipped back, #86 flipped
Session first run: 1
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\DELTA\DATASET0004\Fine Tuning\Z Scans\Run 005\bscanz.dat
Temperature (C)
DELTA:--> T1 20.09 --> T2 20.09 --> T5 19.92 --> T3 20.07 --> Air 19.96 --> T4 20.02 
Axes position (m) X:0.021643 Y:0.000194
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001126 V
Vy_0i = -0.002870 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001192 V
Vy_0f = -0.002983 V
Offset Correction Voff = offset+index*increment
index = 0,1...20000
Vx:offset = 0.001126 V, increment = 3.300E-09 V
Vy:offset = -0.002870 V, increment = -5.655E-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\DELTA\DATASET0004\Fine Tuning\Z Scans\Run 005\
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 = -0.000012 T
Correction, By additive constant = -0.000002 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26625.060000
Electron energy = 13.605381 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.485345
Nominal radiation wavelength = 1.496800e-010 m
Number of undulator poles = 196
Number of end poles (used in analysis) = 4
Cell length = 3.656000 m
Nominal phase change through cell = 615.752160 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 = -0.000012 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 = 196
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 0.403065 T, RMS = 0.004146 T
Peak Field Spacing: Ave = 0.015999 m, RMS = 0.000167 m
Zero Field Spacing: Ave = 0.016000 m, RMS = 0.000078 m
Average Undulator Period = 0.032000 m

Hall Probe Overall Field Integrals:
Int Bx dz =   5.5249e-004 Tm
Int Int Bx dz dz =   9.9893e-004 Tm^2
Int By dz =  -5.7542e-004 Tm
Int Int By dz dz =  -7.0036e-004 Tm^2

Trajectory Exit Information:
X at exit =  -1.5432e-005 m
X slope at exit =  -1.2679e-005
Y at exit =  -2.2011e-005 m
Y slope at exit =  -1.2174e-005

Calculated Undulator Parameters:
Keff = 1.248801
Beff = 0.417954 T
Lambda_rad = 4.016907e-011 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 20.042500 C
Measured Keff = 1.248801
Calculated Keff at 20 C = 1.248823
Relative Change (Keff_20C - Keff) / Keff = 0.000018

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   1.25530e-009
Undulator Period = 0.032000 m
Radiation Wavelength =   4.01691e-011 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, Phase error RMS = 71.151343 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49680e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = -775.784714 deg, RMS = 401.336511 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -12528.228487 deg, RMS = 7166.160042 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = -629.138656 deg, RMS = 386.692847 deg
Cell:
  Phase Change Of Cell =   10454.422 deg
  Nominal Phase Change Of Cell =   35280.000 deg
  Phase Error Of Cell =  -24825.578 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 = 20.042500 C
Measured Phase Change Of Cell =   10454.422 deg
Calculated Phase Change Of Cell At 20 C =   10454.617 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       0.195 deg