SLAC Magnetic Measurements Date: 07-14-2011 Time: 18:20:17 EPU Analysis ------------ Data File Header: SLAC Magnetic Measurements Date: 07-14-2011 Time: 14:46:08 Project: LCLS Device Type: Undulator Data Type: Serial Number: A1-ANL DATASET Number: 1 Tuning Stage: Rough Tuning Run Number: 38 Measurement Type: Z Scans Operator: YL Comment: Gap =25mm; start at Z index #1 Session first run: 36 Measurement Device x: Measurement Device y: SENIS_463 Data File: s:\magdata\LCLS\Undulator\A1-ANL\DATASET0001\Rough Tuning\Z Scans\Run 038\bscanz.dat Temperature (C) Axes position (m) X:0.042678 Y:0.000124 Initial Hall Probe Zero Measurements: Vx_0i = 0.001472 V Vy_0i = 0.002241 V Final Hall Probe Zero Measurements: Vx_0f = 0.001449 V Vy_0f = 0.002226 V Offset Correction Voff = offset+index*increment index = 0,1...17600 Vx:offset = 0.001472 V, increment = -1.283E-09 V Vy:offset = 0.002241 V, increment = -8.513E-10 V Hall Probe Calibration File: Y: C:\CVI\current_calib\SENIS_463\SENIS_463_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\A1-ANL\DATASET0001\Rough Tuning\Z Scans\Run 038\ 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 = 0.000000 T Correction, By additive constant = 0.000016 T Correction Bxy additive file = none Correction Bxy additive file type = CORR_ZBXY Electron gamma = 26627.100000 Electron energy = 13.606423 Gev Nominal undulator period = 0.033000 m Nominal K value = 1.047000 Nominal radiation wavelength = 3.602770e-011 m Number of undulator poles = 144 Number of end poles (used in analysis) = 4 Cell length = 4.000000 m Nominal phase change through cell = 452.389342 rad Nominal phase of pole after end poles = 14.137167 rad Number of poles for entrance and exit phase error statistics = 5 Bx Peak And Zero Field Summary: Number of Poles = 0 Number of End Poles (excluded in statistics) = 0 Peak Fields: Ave = 0.000000 T, RMS = 0.000000 T Peak Field Spacing: Ave = 0.000000 m, RMS = 0.000000 m Zero Field Spacing: Ave = 0.000000 m, RMS = 0.000000 m Average Undulator Period = 0.000000 m By Peak And Zero Field Summary: Number of Poles = 144 Number of End Poles (excluded in statistics) = 4 Peak Fields: Ave = 0.207585 T, RMS = 0.001709 T Peak Field Spacing: Ave = 0.016500 m, RMS = 0.000029 m Zero Field Spacing: Ave = 0.016502 m, RMS = 0.000066 m Average Undulator Period = 0.033004 m 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 -0.00008 1 0.00012 0.20745 2 0.00008 0.00003 3 -0.00003 -0.00009 4 -0.00005 -0.00002 5 0.00002 -0.00005 6 0.00005 0.00002 7 -0.00002 0.00005 8 -0.00005 -0.00002 9 0.00002 -0.00005 10 0.00005 0.00002 By End Fields: Field integral threshold value = 3.0000e-006 Tm Z position where entrance Int By dz at threshold = -1.4012 m Z position where exit Int By dz at threshold = 1.3710 m Z position of first By field peak = -1.1863 m Z position of last By field peak = 1.1865 m Magnetic length entrance = 0.2149 m Magnetic length exit = 0.1845 m Magnetic length between By field peaks = 2.3728 m Magnetic length total = 2.7722 m Hall Probe Overall Field Integrals: Int Bx dz = -8.1464e-005 Tm Int Int Bx dz dz = -5.4531e-005 Tm^2 Int By dz = -8.7347e-005 Tm Int Int By dz dz = 9.8490e-006 Tm^2 Trajectory Exit Information: X at exit = 2.1700e-007 m X slope at exit = -1.9245e-006 Y at exit = 1.2015e-006 m Y slope at exit = 1.7949e-006 Calculated Undulator Parameters: Keff = 0.645506 Beff = 0.209465 T Lambda_rad = 2.812421e-011 m Phase Fluctuations: Slippage vs Z At Peaks Fitted Slope = 8.52140e-010 Undulator Period = 0.033004 m Radiation Wavelength = 2.81242e-011 m Phase Error (From Slippage vs Z Fit Residuals): Ave = -0.000000 deg, RMS = 6.216924 deg Phase Relative To Nominal Radiation Wave: Nominal Radiation Wavelength = 3.60277e-011 m Cell Length = 4.000000 m Number Of End Poles = 4 Entrance: Phase Error Of First 5 Poles After The End Poles Ave = 5501.836862 deg, RMS = 61.517114 deg Center: Phase Error Of All Poles In Undulator Center: Ave = 2911.504967 deg, RMS = 1556.495929 deg Exit: Phase Error To Cell Boundary Of Last 5 Poles Before The End Poles Ave = 5483.587549 deg, RMS = 61.770482 deg Cell: Phase Change Of Cell = 31727.068 deg Nominal Phase Change Of Cell = 25920.000 deg Phase Error Of Cell = 5807.068 deg Spontaneous Radiation: (Forward direction) Single electron at fundamental: |Ex| = 1.127999e-011 (V/m), |Ey| = 1.714447e-014 (V/m) Angle_y - Angle_x = 32.349092 (deg) Stokes Parameters: S0 = Ix + Iy = 1.272384e-022, S1 = Ix - Iy = 1.272378e-022 (V/m)^2 S2 = I45 - I135 = 3.267521e-025, S3 = Ir - Il = -2.069561e-025 (V/m)^2 Polarization Rates: P1 = S1 / S0 = 0.999995, P2 = S2 / S0 = 0.002568 P3 = S3 / S0 = -0.001627 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 44.085 3.998e+018 4.266e+018 93.71 2 88.169 3.761e+015 --- --- 3 132.254 4.290e+017 6.601e+017 64.99 4 176.338 1.837e+015 --- --- 5 220.423 2.431e+016 2.695e+016 90.20 6 264.507 3.709e+014 --- --- 7 308.592 1.022e+015 2.152e+016 4.75 8 352.676 4.740e+013 --- --- 9 396.761 2.522e+013 9.052e+015 0.28 10 440.845 5.906e+012 --- --- 11 484.930 1.434e+012 1.911e+016 0.01 12 529.014 1.969e+012 --- --- 13 573.099 2.094e+012 2.497e+016 0.01 14 617.183 1.361e+012 --- --- 15 661.268 1.675e+012 3.354e+016 0.00