SLAC Magnetic Measurements Date: 01-19-2011 Time: 10:18:01 EPU Analysis ------------ Data File Header: SLAC Magnetic Measurements Date: 01-14-2011 Time: 10:46:07 Project: LCLS Device Type: Undulator Data Type: Serial Number: EPU DATASET Number: 1 Tuning Stage: Rough Tuning Run Number: 234 Measurement Type: Z Scans Operator: YL Comment: check K vs.polarization; gap=25mm; P=0, run1 Session first run: 234 Measurement Device x: Measurement Device y: SENIS_24-06 Data File: s:\magdata\LCLS\Undulator\EPU\DATASET0001\Rough Tuning\Z Scans\Run 234\bscanz.dat Temperature (C) Axes position (m) X:0.030864 Y:0.000217 Initial Hall Probe Zero Measurements: Vx_0i = 0.000965 V Vy_0i = 0.001007 V Vz_0i = 0.000005 V Final Hall Probe Zero Measurements: Vx_0f = 0.000980 V Vy_0f = 0.000982 V Vz_0f = 0.000004 V Offset Correction Voff = offset+index*increment index = 0,1...20600 Vx:offset = 0.000965 V, increment = 7.274E-10 V Vy:offset = 0.001007 V, increment = -1.209E-09 V Vz:offset = 0.000005 V, increment = -5.319E-11 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 Z: c:\cvi\current_calib\HALLz_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\EPU\DATASET0001\Rough Tuning\Z Scans\Run 234\ Input file name = x+00000_y+000_bscanz.dat Input file type = ZVXYZBXYZH Correction required = 1 Correction, Bx multiplicative factor = 1.000000 Correction, By multiplicative factor = 1.000000 Correction, Bx additive constant = -0.000330 T Correction, By additive constant = 0.000060 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 = 0.057032 m Nominal K value = 2.386306 Nominal radiation wavelength = 1.547351e-010 m Number of undulator poles = 131 Number of end poles (used in analysis) = 4 Cell length = 4.000000 m Nominal phase change through cell = 75.398224 rad Nominal phase of pole after end poles = -153.938040 rad Number of poles for entrance and exit phase error statistics = 10 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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 = -0.000330 T CORR_BY_ADD = 0.000060 T CORR_BX_ADD_FILE = none CORR_BY_ADD_FILE = none !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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 = 131 Number of End Poles (excluded in statistics) = 4 Peak Fields: Ave = 0.445650 T, RMS = 0.001428 T Peak Field Spacing: Ave = 0.028519 m, RMS = 0.000057 m Zero Field Spacing: Ave = 0.028518 m, RMS = 0.000040 m Average Undulator Period = 0.057035 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 0.00005 1 -0.44667 0.00017 2 -0.00002 -0.00001 3 0.00089 -0.00003 4 -0.00004 0.00000 5 0.00035 0.00001 6 -0.00004 0.00001 7 0.00004 -0.00001 8 -0.00004 0.00001 9 0.00004 -0.00000 10 -0.00004 -0.00000 Hall Probe Overall Field Integrals: Int Bx dz = 4.4967e-005 Tm Int Int Bx dz dz = -7.9581e-006 Tm^2 Int By dz = 2.2208e-004 Tm Int Int By dz dz = 4.5134e-005 Tm^2 Trajectory Exit Information: X at exit = 9.9425e-007 m X slope at exit = 4.8931e-006 Y at exit = 1.6779e-007 m Y slope at exit = -9.9526e-007 Calculated Undulator Parameters: Keff = 2.377599 Beff = 0.446450 T Lambda_rad = 1.539103e-010 m Phase Fluctuations: Slippage vs Z At Peaks Fitted Slope = 2.69850e-009 Undulator Period = 0.057035 m Radiation Wavelength = 1.53910e-010 m Phase Error (From Slippage vs Z Fit Residuals): Ave = -0.000000 deg, RMS = 6.489649 deg Phase Relative To Nominal Radiation Wave: Nominal Radiation Wavelength = 1.54735e-010 m Cell Length = 4.000000 m Number Of End Poles = 4 Entrance: Phase Error Of First 10 Poles After The End Poles Ave = 9806.636334 deg, RMS = 2.099297 deg Center: Phase Error Of All Poles In Undulator Center: Ave = 9766.356136 deg, RMS = 34.172647 deg Exit: Phase Error To Cell Boundary Of Last 10 Poles Before The End Poles Ave = 9807.902436 deg, RMS = 4.384158 deg Cell: Phase Change Of Cell = 23844.510 deg Nominal Phase Change Of Cell = 4320.000 deg Phase Error Of Cell = 19524.510 deg Spontaneous Radiation: (Forward direction) Single electron at fundamental: |Ex| = 1.003157e-011 (V/m), |Ey| = 4.364389e-015 (V/m) Angle_y - Angle_x = -73.844059 (deg) Stokes Parameters: S0 = Ix + Iy = 1.006324e-022, S1 = Ix - Iy = 1.006324e-022 (V/m)^2 S2 = I45 - I135 = 2.436473e-026, S3 = Ir - Il = 8.410528e-026 (V/m)^2 Polarization Rates: P1 = S1 / S0 = 1.000000, P2 = S2 / S0 = 0.000242 P3 = S3 / S0 = 0.000836 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 8.056 3.162e+018 3.240e+018 97.60 2 16.111 1.371e+015 --- --- 3 24.167 4.217e+018 5.315e+018 79.35 4 32.222 4.377e+015 --- --- 5 40.278 4.052e+018 5.913e+018 68.54 6 48.334 1.218e+016 --- --- 7 56.389 3.284e+018 5.823e+018 56.40 8 64.445 3.095e+016 --- --- 9 72.501 2.146e+018 5.389e+018 39.82 10 80.556 3.554e+016 --- --- 11 88.612 1.391e+018 4.801e+018 28.98 12 96.667 3.188e+016 --- --- 13 104.723 8.772e+017 4.169e+018 21.04 14 112.779 4.037e+016 --- --- 15 120.834 4.789e+017 3.553e+018 13.48