SLAC Magnetic Measurements Date: 07-14-2011 Time: 18:19:19 EPU Analysis ------------ Data File Header: SLAC Magnetic Measurements Date: 07-14-2011 Time: 14:06:55 Project: LCLS Device Type: Undulator Data Type: Serial Number: A1-ANL DATASET Number: 1 Tuning Stage: Rough Tuning Run Number: 37 Measurement Type: Z Scans Operator: YL Comment: Gap =15mm; 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 037\bscanz.dat Temperature (C) Axes position (m) X:0.042678 Y:0.000124 Initial Hall Probe Zero Measurements: Vx_0i = 0.001334 V Vy_0i = 0.001856 V Final Hall Probe Zero Measurements: Vx_0f = 0.001322 V Vy_0f = 0.001824 V Offset Correction Voff = offset+index*increment index = 0,1...17600 Vx:offset = 0.001334 V, increment = -7.194E-10 V Vy:offset = 0.001856 V, increment = -1.837E-09 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 037\ 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 = 0.554756 T, RMS = 0.002893 T Peak Field Spacing: Ave = 0.016500 m, RMS = 0.000027 m Zero Field Spacing: Ave = 0.016501 m, RMS = 0.000045 m Average Undulator Period = 0.033002 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 -0.00015 1 0.00028 0.55172 2 0.00028 0.00007 3 -0.00009 -0.00288 4 -0.00017 -0.00002 5 0.00002 -0.00026 6 0.00017 0.00002 7 -0.00002 0.00018 8 -0.00017 -0.00002 9 0.00002 -0.00017 10 0.00016 0.00002 By End Fields: Field integral threshold value = 3.0000e-006 Tm Z position where entrance Int By dz at threshold = -1.3880 m Z position where exit Int By dz at threshold = 1.3710 m Z position of first By field peak = -1.1821 m Z position of last By field peak = 1.1822 m Magnetic length entrance = 0.2059 m Magnetic length exit = 0.1888 m Magnetic length between By field peaks = 2.3643 m Magnetic length total = 2.7590 m Hall Probe Overall Field Integrals: Int Bx dz = -1.0971e-004 Tm Int Int Bx dz dz = -5.4910e-005 Tm^2 Int By dz = -1.1385e-004 Tm Int Int By dz dz = 8.4291e-005 Tm^2 Trajectory Exit Information: X at exit = 1.8572e-006 m X slope at exit = -2.5085e-006 Y at exit = 1.2098e-006 m Y slope at exit = 2.4173e-006 Calculated Undulator Parameters: Keff = 1.701971 Beff = 0.552317 T Lambda_rad = 5.698216e-011 m Phase Fluctuations: Slippage vs Z At Peaks Fitted Slope = 1.72662e-009 Undulator Period = 0.033002 m Radiation Wavelength = 5.69822e-011 m Phase Error (From Slippage vs Z Fit Residuals): Ave = -0.000000 deg, RMS = 4.567876 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 = 6287.148652 deg, RMS = 169.305449 deg Center: Phase Error Of All Poles In Undulator Center: Ave = 13149.087011 deg, RMS = 4124.849701 deg Exit: Phase Error To Cell Boundary Of Last 5 Poles Before The End Poles Ave = 6269.228791 deg, RMS = 168.977333 deg Cell: Phase Change Of Cell = 52201.115 deg Nominal Phase Change Of Cell = 25920.000 deg Phase Error Of Cell = 26281.115 deg Spontaneous Radiation: (Forward direction) Single electron at fundamental: |Ex| = 1.307373e-011 (V/m), |Ey| = 2.739197e-015 (V/m) Angle_y - Angle_x = -36.130120 (deg) Stokes Parameters: S0 = Ix + Iy = 1.709224e-022, S1 = Ix - Iy = 1.709224e-022 (V/m)^2 S2 = I45 - I135 = 5.784849e-026, S3 = Ir - Il = 4.223045e-026 (V/m)^2 Polarization Rates: P1 = S1 / S0 = 1.000000, P2 = S2 / S0 = 0.000338 P3 = S3 / S0 = 0.000247 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 21.758 5.370e+018 5.587e+018 96.13 2 43.517 4.261e+015 --- --- 3 65.275 5.801e+018 7.030e+018 82.52 4 87.034 6.148e+015 --- --- 5 108.792 4.021e+018 5.618e+018 71.57 6 130.551 9.577e+015 --- --- 7 152.309 2.413e+018 4.260e+018 56.64 8 174.067 1.573e+016 --- --- 9 195.826 1.260e+018 2.648e+018 47.57 10 217.584 1.690e+016 --- --- 11 239.343 5.469e+017 1.936e+018 28.24 12 261.101 1.159e+016 --- --- 13 282.860 2.095e+017 1.008e+018 20.80 14 304.618 8.976e+015 --- --- 15 326.376 7.488e+016 8.140e+017 9.20