“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback - Schematics oco Console Client Event @ 0.5Hz CDEV BPM CORBA Server Event Server Server Event @ 2Hz TRACY Feedback Server Client Poll FB Log Model Server Event Client • Hard Correction (“Matrix Inversion” using SVD) • BPM datasets @ 2 Hz, average over 3 successive datasets = > ≈ 0.4 Hz correction rate (toggle between x/y plane = > 5 s for full cycle SPring-8 12/03/02 Michael B¨ oge 41
“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback - RMS/Mean Orbits, Pathlength • Sample run Aug, 13-16 2002: x rms , y rms ≈ 1 µm (see histograms) • RF frequency corrected by df whenever | df | exceeds 5 Hz (dE/E ≈ 2 · 10 − 5 ) correctio n every ≈ 45 min (see “saw tooth”) SPring-8 12/03/02 Michael B¨ oge 42
“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback - RF changes vs. T, X-BPM Readings • Outside air temperature and RF fre- quency changes – > • X-BPM @ PX ≈ 8.6 m from ID U24 : σ x = 2.7 µ m (drift: 2.3 µ m) σ y = 1.5 µ m (drift: 1.7 µ m) σ x ′ < 0.31 µ rad @ source point ! σ y ′ < 0.18 µ rad @ source point ! SPring-8 12/03/02 Michael B¨ oge 43
“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback: X-BPM Readings for u24@gap=7.4 mm 7.5 mm • U24 X-BPM readings over 7 weeks • U24 gap range [ 7.4,7.5 ] mm • Strong dependence of X-BPM reading on photon beam profile for large gaps SPring-8 12/03/02 Michael B¨ oge 44
“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback: Long Term Stability - BPMS 4000 RF outside temperature 3600 fit 3200 0 RF-499653600 [Hz] and temperature [1/100 deg/C] 2800 xrms 9 yrms 2400 8 7 2000 Jan 6 1600 5 1200 4 800 3 Aug 2 400 rms [mu m] 1 0 0 -400 9 -800 8 7 -1200 6 -1600 Nov 5 -2000 4 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 3 Week #/2002 2 600 1 RF(outside temperature) 400 0 Jan 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 200 Week #/2002 0 RF-499653600 [Hz] -200 • x rms and y rms over 28 weeks -400 -600 • Outside air temperature and RF fre- -800 -1000 quency in 2002 Nov -1200 -1400 • RF frequency vs. outside air temperature Aug -1600 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 in 2002 ( d f ≈ 2000 Hz ≈ 1.2 mm !) temperature [1/100 deg/C] SPring-8 12/03/02 Michael B¨ oge 45
“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback: Stability - POMS no movement ! 200 mA 3.5 µ m 5 µ m 1.5 h 120 mA top−up @ 200 mA decaying beam 15 h dump beam dump beam • PO sition M onitoring S ystem: linear encoders on all BPM stations measuring BPM/adjacent Quadrupole offsets (0.5 µ m resolution) SPring-8 12/03/02 Michael B¨ oge 46
“Top-up” Operation at the Swiss Light Source Slow Orbit Feedback: Long Term Stability - POMS 400 current pomsy step pomsx 350 0.5 m µ mA current [mA] and poms [1/10 mu m] 300 300 180 180 250 200 200 300 250 10 µ m 200 150 100 10 µ m 50 0 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 Week #/2002 • POMS Readings for ARIDI-BPM-05SB upstream of U24 SPring-8 12/03/02 Michael B¨ oge 47
“Top-up” Operation at the Swiss Light Source The Future is “Bright” MXAS/5L Microfocus Absorption Spectroscopy (AS) ID : In-Vac Undulator, NdFeB, 5.5mm gap Energy: U19 → 3-20 KeV (Sumitomo,2004) FEMTO/5L SC Hybrid Wiggler (2004) PX/6S Protein Crystallography ID : In-Vac Undulator, NdFeB, 5mm gap Energy: U19 → 3-18KeV (Sumitomo,2004) MISOX/7M Microfocus Soft X-ray AS (SOLEIL) ID : 2 × APPLE II Type Twin Undulator Energy: UE54 → 700eV-4KeV (2003) PX/10S Protein Crystallography ID : In-Vac Undulator, Sm2Co17, 5mm gap Energy: U19 → 3-18 KeV (2005?) PX/12S Protein Crystallography ID : In-Vac Undulator, SC, 4mm gap, 1T Energy: U12 → 5-30 KeV (2005?) SPring-8 12/03/02 Michael B¨ oge 48
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