SLAC Magnetic Measurements
Date: 04-07-2008
Time: 16:19:19
 
Planar Insertion Device Analysis
--------------------------------

Data File Header:
SLAC Magnetic Measurements
Date: 04-07-2008
Time: 15:53:19
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: L143-112000-31
DATASET Number: 1
Tuning Stage: Rough Tuning
Run Number: 67
Measurement Type: Z Scans
Operator: aw
Comment: 1st pole = 0.372733, x=0.026151, y=0.00026247.   1/4 turn out at 6 x-shim. 1/4 turn in at 142 x-shim.
Measurement Device x: 
Measurement Device y: SENIS_24-06
Data File: s:\magdata\LCLS\Undulator\L143-112000-31\DATASET0001\Rough Tuning\Z Scans\Run 067\bscanz.dat
Temperature (C)
L143-112000-31:--> top_start 20.14 --> top_mid 20.16 --> top_end 20.04 --> bot 20.15 --> granite 19.96 --> Air 20.02 
Axes position (m) X:0.026151 Y:0.000262
Initial Hall Probe Zero Measurements:
Vx_0i = -0.000346 V
Vy_0i = -0.000481 V
Final Hall Probe Zero Measurements:
Vx_0f = -0.000486 V
Vy_0f = -0.000466 V
Offset Correction Voff = offset+index*increment
index = 0,1...19850
Vx:offset = -0.000346 V, increment = -7.039E-09 V
Vy:offset = -0.000481 V, increment = 7.388E-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\L143-112000-31\DATASET0001\Rough Tuning\Z Scans\Run 067\
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 = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 26629.140000
Electron energy = 13.607466 Gev
Nominal undulator period = 0.030000 m
Nominal K value = 3.486231
Nominal radiation wavelength = 1.496995e-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 = 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 = 1.271622 T, RMS = 0.006137 T
Peak Field Spacing: Ave = 0.015001 m, RMS = 0.000027 m
Zero Field Spacing: Ave = 0.015001 m, RMS = 0.000041 m
Average Undulator Period = 0.030001 m

Hall Probe Overall Field Integrals:
Int Bx dz =   2.6099e-006 Tm
Int Int Bx dz dz =  -1.0386e-004 Tm^2
Int By dz =   7.6902e-005 Tm
Int Int By dz dz =   7.8977e-005 Tm^2

Trajectory Exit Information:
X at exit =   1.7400e-006 m
X slope at exit =   1.6943e-006
Y at exit =   2.2882e-006 m
Y slope at exit =  -5.7500e-008

Calculated Undulator Parameters:
Keff = 3.486146
Beff = 1.244465 T
Lambda_rad = 1.497004e-010 m

Calculated K Value At 20 C:
(Assumes Keff changes by -.05% per degree C)
Measured Average Undulator Temperature = 20.122500 C
Measured Keff = 3.486146
Calculated Keff at 20 C = 3.486359
Relative Change (Keff_20C - Keff) / Keff = 0.000061

Phase Fluctuations:
Slippage vs Z At Peaks Fitted Slope =   4.98977e-009
Undulator Period = 0.030001 m
Radiation Wavelength =   1.49700e-010 m
Phase Error (From Slippage vs Z Fit Residuals):
  Ave = -0.000000 deg, RMS = 3.933545 deg

Phase Relative To Nominal Radiation Wave:
Nominal Radiation Wavelength =   1.49699e-010 m
Cell Length = 3.656000 m
Number Of End Poles = 4
Entrance:
  Phase Error Of First 10 Poles After The End Poles
  Ave = 2.293425 deg, RMS = 5.659989 deg
Center:
  Phase Error Of All Poles In Undulator Center:
  Ave = -0.325475 deg, RMS = 4.020209 deg
Exit:
  Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles
  Ave = 1.488802 deg, RMS = 2.826126 deg
Cell:
  Phase Change Of Cell =   40682.076 deg
  Nominal Phase Change Of Cell =   40680.000 deg
  Phase Error Of Cell =       2.076 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 = 20.122500 C
Measured Phase Change Of Cell =   40682.076 deg
Calculated Phase Change Of Cell At 20 C =   40686.356 deg
Phase Change Due To Temperature (Phase_20C - Phase) =       4.279 deg