SLAC Magnetic Measurements
Date: 09-03-2008
Time: 11:08:48
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 09-03-2008
Time: 10:59:42
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-38
DATASET Number: 1
Tuning Stage: Fine Tuning
Run Number: 8
Measurement Type: Z Scans
Operator: YL
Comment: find Y at min K; check after gluing shims
Session first run: 8
Measurement Device x: 
Measurement Device y: SENTRON_441
Data File: s:\magdata\LCLS\Undulator\L143-112000-38\DATASET0001\Fine Tuning\Z Scans\Run 008\zscan.dat
Temperature (C)
L143-112000-38:--> top_end 19.96 --> top_mid 19.94 --> top_start 19.97 --> bottom 19.94 --> Air 19.97 --> Granite 19.97 
Axes position (m) X:0.025014 Y:0.000505
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001682 V
Vy_0i = -0.000573 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.001677 V
Vy_0f = -0.000609 V
Offset Correction Voff = offset+index*increment
index = 0,1...21250
Vx:offset = 0.001682 V, increment = -2.436E-10 V
Vy:offset = -0.000573 V, increment = -1.703E-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\L143-112000-38\DATASET0001\Fine Tuning\Z Scans\Run 008\
Input file name = x+00000_y+100_zscan.dat
Input file type = ZVXYBXYH
Correction required = 1
Correction, Bx multiplicative factor = 1.000000 
Correction, By multiplicative factor = 1.000000 
Correction, Bx additive constant = -0.000022 T
Correction, By additive constant = -0.000016 T
Correction Bxy additive file = none
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 = -0.000022 T
CORR_BY_ADD = -0.000016 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 = 1.272595 T, RMS = 0.005210 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 =  -1.7867e-004 Tm
Int Int Bx dz dz =  -3.1099e-004 Tm^2
Int By dz =   5.8059e-006 Tm
Int Int By dz dz =  -4.9168e-006 Tm^2

Trajectory Exit Information:
X at exit =  -1.0826e-007 m
X slope at exit =   1.2784e-007
Y at exit =   6.8477e-006 m
Y slope at exit =   3.9341e-006

Calculated Undulator Parameters:
Keff = 3.491045
Beff = 1.246304 T
Lambda_rad = 1.498824e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 19.952500 C
Measured Keff = 3.491045
Calculated Keff at 20 C = 3.490962
Relative Change (Keff_20C - Keff) / Keff = -0.000024

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.99620e-009
Undulator Period = 0.029999 m
Radiation Wavelength =   1.49882e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, RMS = 4.178074 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 = 1.799086 deg, RMS = 3.842359 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = 12.178322 deg, RMS = 8.938040 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 6.308195 deg, RMS = 3.580547 deg
Cell:
  Phase Change Of Cell =   40712.297 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =      32.297 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 = 19.952500 C
Measured Phase Change Of Cell =   40712.297 deg
Calculated Phase Change Of Cell At 20 C =   40710.636 deg
Phase Change Due To Temperature (Phase_20C - Phase) =      -1.661 deg