SLAC Magnetic Measurements Date: 09-17-2012 Time: 12:36:22 EPU Analysis ------------ Data File Header: SLAC Magnetic Measurements Date: 09-17-2012 Time: 12:31:05 Project: LCLS Device Type: Undulator Data Type: Serial Number: SSRL-BL5-EPU DATASET Number: 1 Tuning Stage: Rough Tuning Run Number: 11 Measurement Type: Z Scans Operator: YL Comment: check CP+ at x = +10mm; second time Session first run: 10 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 011\bscanz.dat Temperature (C) Axes position (m) X:0.047832 Y:0.000100 Initial Hall Probe Zero Measurements: Vx_0i = 0.000962 V Vy_0i = 0.000959 V Final Hall Probe Zero Measurements: Vx_0f = 0.000931 V Vy_0f = 0.000933 V Offset Correction Voff = offset+index*increment index = 0,1...14600 Vx:offset = 0.000962 V, increment = -2.075E-09 V Vy:offset = 0.000959 V, increment = -1.791E-09 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 011\ Input file name = x+00000_y+000_bscanz.dat Input file type = ZVXYBXYH Correction required = 0 Correction, Bx multiplicative factor = 1.000000 Correction, By multiplicative factor = 1.000000 Correction, Bx additive constant = 0.000017 T Correction, By additive constant = 0.000000 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 Bx Peak And Zero Field Summary: Number of Poles = 30 Number of End Poles (excluded in statistics) = 4 Peak Fields: Ave = 0.472182 T, RMS = 0.002455 T Peak Field Spacing: Ave = 0.070022 m, RMS = 0.000174 m Zero Field Spacing: Ave = 0.070019 m, RMS = 0.000157 m Average Undulator Period = 0.140037 m By Peak And Zero Field Summary: Number of Poles = 31 Number of End Poles (excluded in statistics) = 4 Peak Fields: Ave = 0.443159 T, RMS = 0.004718 T Peak Field Spacing: Ave = 0.070019 m, RMS = 0.000152 m Zero Field Spacing: Ave = 0.070034 m, RMS = 0.000170 m Average Undulator Period = 0.140068 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 0.00004 1 -0.00346 0.46385 2 0.00006 -0.00016 3 -0.00028 0.00066 4 0.00009 0.00002 5 -0.00062 0.01061 6 -0.00011 -0.00006 7 -0.00007 0.00016 8 0.00010 0.00003 9 -0.00004 0.00059 10 -0.00011 -0.00004 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 -0.00049 1 -0.69150 -0.00077 2 0.00013 0.00057 3 0.00321 0.00004 4 0.00027 -0.00031 5 -0.05082 0.00030 6 -0.00002 0.00009 7 0.00051 -0.00008 8 -0.00013 -0.00013 9 -0.00770 0.00029 10 0.00012 -0.00016 Hall Probe Overall Field Integrals: Int Bx dz = -4.1325e-005 Tm Int Int Bx dz dz = 7.4225e-005 Tm^2 Int By dz = -5.5041e-004 Tm Int Int By dz dz = -7.4531e-004 Tm^2 Trajectory Exit Information: X at exit = -7.4389e-005 m X slope at exit = -5.4936e-005 Y at exit = -7.4083e-006 m Y slope at exit = 4.1247e-006 Calculated Undulator Parameters: Keff = 10.892334 Beff = 0.832932 T Lambda_rad = 1.222569e-007 m Phase Fluctuations: Slippage vs Z At Peaks Fitted Slope = 8.72937e-007 Undulator Period = 0.140052 m Radiation Wavelength = 1.22257e-007 m Phase Error (From Slippage vs Z Fit Residuals): Ave = -0.000000 deg, RMS = 3.292488 deg Phase Relative To Nominal Radiation Wave: Nominal Radiation Wavelength = 0.00000e+000 m, (if 0, use radiation wavelength) Cell Length = 3.126000 m Number Of End Poles = 4 Entrance: Phase Error Of First 5 Poles After The End Poles Ave = -3080.066985 deg, RMS = 3.592380 deg Center: Phase Error Of All Poles In Undulator Center: Ave = -3079.082219 deg, RMS = 3.174466 deg Exit: Phase Error To Cell Boundary Of Last 5 Poles Before The End Poles Ave = -3166.439965 deg, RMS = 3.517710 deg Cell: Phase Change Of Cell = 5274.956 deg Nominal Phase Change Of Cell = 11520.000 deg Phase Error Of Cell = -6245.044 deg Spontaneous Radiation: (Forward direction) Single electron at fundamental: |Ex| = 1.400198e-013 (V/m), |Ey| = 1.106000e-013 (V/m) Angle_y - Angle_x = -90.236507 (deg) Stokes Parameters: S0 = Ix + Iy = 3.183791e-026, S1 = Ix - Iy = 7.373173e-027 (V/m)^2 S2 = I45 - I135 = -1.278480e-028, S3 = Ir - Il = 3.097212e-026 (V/m)^2 Polarization Rates: P1 = S1 / S0 = 0.231585, P2 = S2 / S0 = -0.004016 P3 = S3 / S0 = 0.972806 Spectra: (Ideal = calc field period using FT coeff repeated with no phase errors) Harmonic Energy Ang Num Spect Ideal Efficiency # (keV) (ph/sec/mrad^2/0.1%bw/0.1A) % -------- -------- -------------- -------------- ------------ 1 0.010 1.000e+015 1.064e+015 94.06 2 0.020 2.079e+013 --- --- 3 0.030 6.486e+014 7.130e+014 90.96 4 0.041 2.683e+013 --- --- 5 0.051 1.544e+014 2.497e+014 61.84 6 0.061 1.826e+013 --- --- 7 0.071 6.951e+013 1.052e+014 66.09 8 0.081 5.499e+012 --- --- 9 0.091 1.792e+013 4.540e+013 39.47 10 0.101 2.445e+013 --- --- 11 0.112 1.545e+013 2.172e+013 71.14 12 0.122 1.601e+013 --- --- 13 0.132 2.638e+012 1.208e+013 21.84 14 0.142 4.457e+013 --- --- 15 0.152 1.591e+012 7.806e+012 20.38