Fast Orbit Feedback at the SLS. Outline
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1 Fast Orbit Feedback at the SLS 2nd Workshop on Beam Orbit Stabilisation (December4-6, 2002, SPring-8) T. Schilcher Outline Noise Sources at SLS Stability / System Requirements Fast Orbit Feedback Implementation Digital BPM System Status Outlook
2 Noise Sources at SLS conditions: spectra measured with DBPM system normal work day booster ramping with 3 Hz for top-up operation no ID movements known noise sources not yet identified noise sources 3 Hz: booster ramping 85 Hz, 209 Hz Hz: girder vibrations 50 Hz and harmonics: net line
3 Noise Sources at SLS ( Hz) m RMS } 0.6 m RMS 0.6 m RMS 0.4 m RMS 10 m x (at location of pickup) m RMS } 0.6 m RMS 0.3 m RMS 0.5 m RMS 21 m y (at location of pickup) horizontal vertical total 1.7 m RMS 1.8 m RMS noise (DBPM) 1.2 m RMS 1.2 m RMS beam osc. 1.2 m RMS 0.9 m RMS BPM) (scaled with (scaled with (mean)10 m /) / x x(mean) y(mean) (mean)11 m y
4 Stability Requirements position stability: 1/10th of vertical beam size at location of insertion devices 1 m RMS in vertical plane (1% coupling) but: < 1 m RMS in vertical plane (<1% coupling) suppress oscillations up to 100 Hz by factor of 5 fast compensation of orbit distortions due to user controlled ID movements
5 Theoretical Noise Suppression with Feedback: PID controller bandwidth of vacuum chamber, corrector magnet including eddy currents: 120 Hz f =1 ks/s s f =2 ks/s s f =4 ks/s s f =4 ks/s s f =2 ks/s s -10 db reached at: f S = 1 ks/s: 20 Hz f S = 2 ks/s: 45 Hz f = 4 ks/s: 100 Hz S f =1 ks/s s transfer function of feedback loop still to be measured...
6 Power Supply Resolution / RMS Orbit Distortion Residual vertical RMS orbit after orbit correction as seen by the monitors: RMS Girder Error: mm 11/98
7 Slow Orbit Feedback central processing unit: calculate inverted response matrix (SVD) read all BPM values calculate correction set new corrector settings use control system network 100 Mbit/s Ethernet beam dynamics server SLS Storage Ring Fast Orbit Feedback A -1 = 1 bpm 72 1 corr. 100 Mbit/s Ethernet SLS Storage Ring 72x72 processing decentralized and integrated in the 12 BPM stations (6 BPMs and 6 corrector magnets per station) 72 beam dynamics server 40 Mbyte/s point-to-point fibre optic links
8 Fast Orbit Feedback Hardware Layout DBPM System timing signal BPM pickups V A V B V C V D RF Front End 6 Digital Down Converter SHARC link ports (40 MB/sec) FOFB System DSP1 VME Bus fiber optic links to adjacent sectors (40 MB/sec) serial interf. DSP2 PS PS CTRL CTRL PS CTRL Interface fiber optic links EPICS IOC LAN (TCP/IP)
9 Digital BPM System Resolution Power Level [dbm] constant gain levels of: Resolution [mm] closed orbit / feedback mode turn-by-turn mode ramp-250ms mode minimum turn-by-turn resolution (1 MS/s) at SLS < 20 m minimum ramp-250ms resolution (30 ks/s) at SLS < 3 m minimum closed orbit / feedback resolution (4 ks/s) < 1.2 m Beam Current [ma]
10 Implemented Modes: Digital BPM System Mode Digital Down Converter Passband BW Resolution Output Rate (khz) (khz) RMS (m) 1. turn by turn ms mode ms mode closed orbit mode alternative FOFB modes (?): 4 khz DDC output rate, 0.5 khz analogue BW? 8 khz DDC output rate and decimation on DSP, 1.5 khz analogue BW?... batch processing real time processing
11 Fast Orbit Feedback Properties: update rate: 4 khz BPM data exchange only between adjacent sectors over point-to-point fibre optic links (40 Mbytes/s) (reflecting the localized structure of the inverted response matrix) direct control of magnet power supplies (by-passing control system) decentralized structure of feedback can continuously run even if not all BPM data are available for the current cycle (link breakdown etc...)... still to be proven
12 Status feedback running in passive mode (3 Hz) processing times: - digital down-conversion and decimation: ~250 s - digital x/y calculation: ~ 70 s - global data exchange: < 8 s - feedback algorithm: ~ 40 s - data transfer to PS controller: < 30 s total delay: ~ 150 s s ( ADC integration ) Digital down-converter firmware upgrade needed to synchronize all BPMs (but: presently priority to multibunch feedback system...)
13 Dispersion Correction available BPM information per DBPM station: 18 position readings per plane Dispersion Function: dispersion [m] SD 01SE sector (N-1) sector (N) sector (N+1) 01SB 02SB 02SE 02SD 02MD 02ME 02MB 03MB 03ME 03MD 03SD BPM dp x = x + D x p dp = 1/N p x i D xi 03SE 03SB 04SB 04SE 04SD -5 dp/p < 210 by central frequency control (BD application) maximum dispersive contribution: D dp x 4 m p
14 dp/p Calculation measurement: 24 November 2002 local fit: global fit: averaged over 100 samples averaged over 3 samples 1 dispersion orbits (path length changes) will not be corrected by fast orbit feedback T. Schilcher presentation Samstag, 30. November :17:28 2nd Workshop On Beam Orbit Stabilisation, Dec. 4-6, 2002
15 Conclusion / Outlook fast orbit feedback (FOFB) scheme running in 3 Hz passive mode to check functionality and integration dp/p correction possible even if decentralized final decision about BPM bandwidth and DDC output rates to be made planned start of 3 Hz FOFB in active mode: Jan planned start of 4 khz FOFB: ~ spring 2003 (firmware upgrade of BPM system)
16 BPM Operation Modes Batch Processing Mode 250 ms mode (present operation mode): average position average position 64 samples 64 samples = 2 ms = 2 ms } } samples 8192 samples = 252 ms = 252 ms 320 ms (3.125 Hz injection trigger) time Real Time Processing Mode (future operation mode): position position position time 250 s (4 khz sample rate)
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