SLAC Magnetic Measurements
Date: 10-09-2012
Time: 11:18:30
 
EPU Analysis
------------

Data File Header:
SLAC Magnetic Measurements
Date: 09-18-2012
Time: 11:52:09
Project: LCLS
Device Type: Undulator
Data Type: 
Serial Number: SSRL-BL5-EPU
DATASET Number: 1
Tuning Stage: Rough Tuning
Run Number: 20
Measurement Type: Z Scans
Operator: YL
Comment: check CP- at x =+-24mm
Session first run: 20
Measurement Device x: SENIS_469
Measurement Device y: SENIS_469
Data File: s:\magdata\LCLS\Undulator\SSRL-BL5-EPU\DATASET0001\Rough Tuning\Z Scans\Run 020\bscanz.dat
Temperature (C)
Axes position (m) X:0.047833 Y:0.000099
Initial Hall Probe Zero Measurements:
Vx_0i = 0.001036 V
Vy_0i = 0.000941 V
Final Hall Probe Zero Measurements:
Vx_0f = 0.000989 V
Vy_0f = 0.000936 V
Offset Correction Voff = offset+index*increment
index = 0,1...14600
Vx:offset = 0.001036 V, increment = -3.244E-09 V
Vy:offset = 0.000941 V, increment = -2.995E-10 V
Hall Probe Calibration File:
Y: C:\CVI\current_calib\SENIS_469\SENIS_469_y.ini
X: C:\CVI\current_calib\SENIS_469\SENIS_469_x.ini
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\SSRL-BL5-EPU\DATASET0001\Rough Tuning\Z Scans\Run 020\
Input file name = x+10000_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 = -0.000120 T
Correction, By additive constant = 0.000005 T
Correction Bxy additive file = none
Correction Bxy additive file type = CORR_ZBXY
Electron gamma = 5878.000000
Electron energy = 3.003653 Gev
Nominal undulator period = 140.000000 m
Nominal K value = 9.000000
Nominal radiation wavelength = 0.000000e+000 m
Number of undulator poles = 31
Number of end poles (used in analysis) = 4
Cell length = 3.126000 m
Nominal phase change through cell = 201.061930 rad
Nominal phase of pole after end poles = 65.973446 rad
Number of poles for entrance and exit phase error statistics = 5

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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 = -0.000120 T
CORR_BY_ADD = 0.000005 T
CORR_BX_ADD_FILE = none
CORR_BY_ADD_FILE = none
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Bx Peak And Zero Field Summary:
Number of Poles = 30
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 0.471323 T, RMS = 0.003126 T
Peak Field Spacing: Ave = 0.070032 m, RMS = 0.000149 m
Zero Field Spacing: Ave = 0.070021 m, RMS = 0.000136 m
Average Undulator Period = 0.140043 m

By Peak And Zero Field Summary:
Number of Poles = 31
Number of End Poles (excluded in statistics) = 4
Peak Fields: Ave = 0.446927 T, RMS = 0.005026 T
Peak Field Spacing: Ave = 0.070032 m, RMS = 0.000145 m
Zero Field Spacing: Ave = 0.070031 m, RMS = 0.000167 m
Average Undulator Period = 0.140062 m

Bx Field Harmonics:
In the undulator center, over an integer number of periods, expand Bx as
Bx(z) = a0 + Sum{ an cos(n 2 pi z / lambda_u) + bn sin(n 2 pi z / lambda_u) }
   n         an        bn   
            (T)       (T)   
--------  --------  --------
   0      -0.00026
   1       0.00340  -0.46355
   2      -0.00051  -0.00010
   3       0.00023  -0.00056
   4       0.00001  -0.00004
   5       0.00066  -0.00982
   6      -0.00002  -0.00003
   7       0.00000  -0.00009
   8      -0.00001   0.00001
   9       0.00018  -0.00044
  10       0.00001  -0.00001

By Field Harmonics:
In the undulator center, over an integer number of periods, expand By as
By(z) = a0 + Sum{ an cos(n 2 pi z / lambda_u) + bn sin(n 2 pi z / lambda_u) }
   n         an        bn   
            (T)       (T)   
--------  --------  --------
   0      -0.00052
   1      -0.70139  -0.00005
   2       0.00024  -0.00066
   3       0.00304   0.00030
   4       0.00014  -0.00039
   5      -0.05473  -0.00065
   6      -0.00010   0.00017
   7       0.00048  -0.00007
   8      -0.00017  -0.00012
   9      -0.00877  -0.00001
  10       0.00007  -0.00015

Hall Probe Overall Field Integrals:
Int Bx dz =  -3.2645e-004 Tm
Int Int Bx dz dz =  -3.0858e-004 Tm^2
Int By dz =  -5.6363e-004 Tm
Int Int By dz dz =  -7.5697e-004 Tm^2

Trajectory Exit Information:
X at exit =  -7.5553e-005 m
X slope at exit =  -5.6256e-005
Y at exit =   3.0800e-005 m
Y slope at exit =   3.2583e-005