Slow Orbit Feedback - Schematics oco Console Client Event @ 0.5Hz - - PowerPoint PPT Presentation

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Oct 06, 2023 122 likes •214 views

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

SLIDE 1

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Slow Orbit Feedback - Schematics

Client Feedback

BPM Server TRACY Server Client

Event Event @ 0.5Hz @ 2Hz Poll

FB Log Client Server CDEV

Event Event

Console CORBA Server Model Server

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

Michael B¨

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SLIDE 2

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Slow Orbit Feedback - RMS/Mean Orbits, Pathlength

Sample run Aug, 13-16 2002: xrms, yrms ≈ 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”)

Michael B¨

42

SLIDE 3

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 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: σx = 2.7 µm (drift: 2.3 µm) σy = 1.5 µm (drift: 1.7 µm) σx′ < 0.31 µrad @ source point ! σy′ < 0.18 µrad @ source point !

Michael B¨

43

SLIDE 4

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 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

Michael B¨

44

SLIDE 5

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 Slow Orbit Feedback: Long Term Stability - BPMS

1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 rms [mu m] Week #/2002 xrms yrms

xrms and yrms over 28 weeks
Outside air temperature and RF fre-

quency in 2002

RF frequency vs. outside air temperature

in 2002 (d f ≈2000 Hz ≈1.2 mm !)

2000
1600
1200
800
400

400 800 1200 1600 2000 2400 2800 3200 3600 4000 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 RF-499653600 [Hz] and temperature [1/100 deg/C] Week #/2002 RF

utside temperature

fit

Aug Jan Nov

1600
1400
1200
1000
800
600
400
200

200 400 600 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 RF-499653600 [Hz] temperature [1/100 deg/C] RF(outside temperature)

Aug Jan Nov

Michael B¨

45

SLIDE 6

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Slow Orbit Feedback: Stability - POMS

dump beam dump beam 3.5 µm 5µm decaying beam 1.5 h 120 mA 200 mA top−up @ 200 mA no movement ! 15 h

POsition Monitoring System: linear encoders on all BPM stations

measuring BPM/adjacent Quadrupole offsets (0.5 µm resolution)

Michael B¨

46

SLIDE 7

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Slow Orbit Feedback: Long Term Stability - POMS

50 100 150 200 250 300 350 400 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 current [mA] and poms [1/10 mu m] Week #/2002 current pomsy pomsx

10 µm µm 10 300 200 250 180 mA 180 200 300 m µ 0.5 step

POMS Readings for ARIDI-BPM-05SB upstream of U24

Michael B¨

47

SLIDE 8

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 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?)