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Amor NADJI IWBS2004 December 6-10, 2004 1
STATUS REPORT ON BEAM POSITION
STABILITY STUDIES AT SOLEIL
Amor Nadjion behalf of the SOLEIL team
Amor NADJI IWBS2004 December 6-10, 2004 2
q SOLEIL Project Overview
q Stability Requirements
q Storage Ring Slab
q Measurements on the Magnet-Girder Assembly
q Measurements on the HLS Prototype
q Air Conditioning
q Results on the BPM Electronics Prototype
q Beam Position FeedBacks
CONTENTS
Amor NADJI IWBS2004 December 6-10, 2004 3
SOLEIL PROJECT : ACCELERATORS
2.75 GeV
STORAGE RING
2.75 GeVBOOSTER
100 MeV
LINAC
BOOSTER:
2 super periods
36 Dipoles : 0.67 T / 2.17 m
44 Qpoles:
10.3 T/m/0.4 m
Drifts: 3.17 m
Circumference:157 m
Emittance:
150 nm
Power supplies cycling at 3 Hz
(SLS concept)
LINAC specification :
• (500 mA in 416 bunches): Output LINAC charge 8 nC in
300 ns
• In temporal structure (100 mA in 8 bunches):
• Output LINAC charge 1.5 nC in 3 bunches
TOP UP Injection : injection every 2 min (for a beam lifetime as bas as 4h).
Amor NADJI IWBS2004 December 6-10, 2004 4
Energy: 2.75 GeV
Circumference: 354.097 m
Emittance H / V: 3.73 nm.rad / 37.3 pm.rad
Number of cells / super periods: 16 / 4
Straight sections: 12 m x 4 ; 7 m x 12 ; 3.8 m x 8
Betatron tunes, νx/νz: 18.19 / 10.29
Natural Chromat. ξx/ξ
z : -52.42 / -22.76
Momentum compaction: 4.49×10-4
Energy dispersion : 1.02 10-3
Revolution Frequency : 0.846 MHz
STORAGE RING MAIN PARAMETERS
Amor NADJI IWBS2004 December 6-10, 2004 5
0
5
10
15
20
25
30
0 10 20 30 40 50 60 70 80
s (m)
βx (m)
10*ηx(m)
βz (m)
OPTICAL FUNCTIONS FOR ONE SUPER PERIOD
Nominal Point : 18.19 / 10.29
Amor NADJI IWBS2004 December 6-10, 2004 6
��2500 users ������������������
• 10 beamlines
in spring 2006
• 24 beamlines in 2009
��43 possible beamlines,
21 on undulators
SOLEIL PROJECT : BEAMLINES
Amor NADJI IWBS2004 December 6-10, 2004 7
v Long term stability : 100 µm / 10 m / year
ü Building foundation, (Piles)ü Alignement, (Girder design)ü HLS survey
v Medium term stability : (24h) (reference BPM versus beamlines)
ü Storage ring tunnel (and water cooling) : 21 °C ± 0.1 °Cü Experimental hall : 21 °C ± 1 °Cü Slow Orbit FeedBackü Top-up
v Short term stability : σCOD < 0.1 σBeam and σ’COD < 0.1 σ’Beam
ü Girder designü Fast Orbit FeedBack
STABILITY CRITERIA
0.50.8Vertical
318Horizontal
σσσσ’COD
(µrad)σσσσ
COD
(µm)
(medium straight section)!Sub-micron tolerances!
Amor NADJI IWBS2004 December 6-10, 2004 8
BUILDING FOUNDATION
üSlab (0.8m thick) of the ring tunnel and experimental hall on simple bored piles (diameter 0.8and 0.6m respectively) with
connected slab.
üNo treatment of the soil.
Chosen solution : Bored Piles
Amor NADJI IWBS2004 December 6-10, 2004 9
Date : Oct 13th 2003 Length : 16 mWeight : 38 t
First Pile
Amor NADJI IWBS2004 December 6-10, 2004 10
128 under the ring tunnel
420 under the experimental hall (4*105)
64 under linac and booster with a slab unconnected
Bored Piles
Amor NADJI IWBS2004 December 6-10, 2004 11
163,230
163,235
163,240
163,245
163,250
163,255
163,260
163,265
163,270
0 50 100 150 200 250 300 350
S (m)
Z (
m)
BETON ANNEAU BETON LINAC BETON BOOSTER
DE
LT
A M
AX
I: 3.5
cm
Anneau de
stockage
Alt moy: 163.251
Booster
Alt moy: 163.246
Linac
Alt moy: 163.246
Profil altimétrique dalles Linac, Booster, anneau de stockage
(30 juillet 2004)
Tolerance : ± 5 mm
NewTolerance : +5/-12 mm
STORAGE RING SLAB PLANARITY
Amor NADJI IWBS2004 December 6-10, 2004 12
STORAGE RING CELLS
v 2 Configurations :
§2 adjacent girders supporting 1 dipole §3 adjacent girders supporting 2 dipoles
v 4 types of girders (a total of 56 girders)
v girder lengths between 3.5 m and 5 m
Amor NADJI IWBS2004 December 6-10, 2004 13
STORAGE RING SURVEYING
v Planimetric survey (s,x) by optical means : ü theodolite (long scale)
ü wire ecartometre (short scale ) designed especially for SOLEIL by afrench company, Symétrie :
rms measured accuracy ~ 5 µm with a 15 m long Kevlar wire
v Altimetry survey (z) : HLS (Hydrostatic Levelling System) network used inabsolute way
HLSFogale HLS (Nîmes, France)
(3 sensors per girder)
(5 m long girder : model view)
Amor NADJI IWBS2004 December 6-10, 2004 14
HLS : Requirements for storage ring
positioning
v In terms of bandwidth:
– Detection of the variations on an hour scale
– Maintenance of the system once a year (ex: slow drift elimination)
v The origin of the main physical parameters to be taken into consideration :
– Thermics : fluid & mechanics dilation,
– Mechanics : fluid movements, stability of the sensor
– Electronics : capacitive measurement & signal conditioning
Amor NADJI IWBS2004 December 6-10, 2004 15
QUALIFICATION TESTS OF THE HLS
(short term stability : 0.4 µm after 1 hour)
Réseau HLS 110m:
Effet du remplissage-vidage
(écart-type)
0.000
0.001
0.002
9:30 10:30 11:30 12:30 13:30 14:30 15:30 16:30 17:30
heure
sig
ma
(m
m)
20mn
55 mn
Re
mp
lissa
ge
Vid
ag
e
0,4 microns
HLS network (110m)Filling up / emptyingeffect (rms values)
Amor NADJI IWBS2004 December 6-10, 2004 16
QUALIFICATION TESTS OF THE HLS
(Long term stability)
Temperature
4 months
5µm
Amor NADJI IWBS2004 December 6-10, 2004 17
5 m LONG GIRDER : MODEL VIEW
(2 jacks)
(1 jack)
Amor NADJI IWBS2004 December 6-10, 2004 18
THE GIRDER STAND
X setting pushing screws
AIRLOC® jack
travel Z= +8/-6 mm
(no loss of the setting after clamping)
clamping on the 4 binding points (increases stiffness)
(one jack configuration)
Amor NADJI IWBS2004 December 6-10, 2004 19
5 m LONG GIRDER : PROTOTYPE REAL VIEW
(This central stand is suppressed in the final version)
Amor NADJI IWBS2004 December 6-10, 2004 20
v Deflexion with full load: ≈ 10µm
5m girder: flatness envelope
-20
-15
-10
-5
0
5
10
15
20
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
External side Internal side
15
�
m
STATIC GIRDER MEASUREMENTS
(with a Micro-Contrôle STR500 alignment laser and a Leica NIVEL20 clinometer)
(15 µm)
Amor NADJI IWBS2004 December 6-10, 2004 21
Q2
Q1
H1
Q3
H2
D-1 Q4-1
D-2
H3-1
Q5-1
H4Q5-2
Q3-2Q4-2
Q7
Q6
H5H6 Q8
180 W
180 W
180 W180 W
180 W180 W180 W
180 W
122 W
122 W
122 W
122 W
122 W
122 W
122 W
350 W
465 W
1000 W
1000 W465 W
465 W
465 W
Puissance dissipée dans l’air
Poutre moyenne
Poutre longue
Poutre courte
AIR CONDITIONING : CELL01 MODELING
Hypothesis : 15% of the power is dissipated in air (pessimistic)
Amor NADJI IWBS2004 December 6-10, 2004 22
STORAGE RING AIR CONDITIONING
Dipole
GirdersUTA
UTA(blowing unit)
Fluorescent Tubes 72W each
1,30m
1,20m
2,50 m
Beam Axis
UTA blowing temperature = 18°Chorizontal widening angle 5°
vertical deflection angle +10°
Amor NADJI IWBS2004 December 6-10, 2004 23
TEMPERATURE DISTRIBUTION :
Horizontal Plane
1 m
Jets froids
1,48 m (UTA axis)1.20 m (Beam axis)
v The achieved static (average) air temperature in the area of the girders is of 19.5 ± 0.3 °C in the longitudinal direction. UTA regulation should insure thetemporal stability within ± 0.1 °C.
(altimetry)
Amor NADJI IWBS2004 December 6-10, 2004 24
DYNAMIC MEASUREMENTS
TEST BENCH : MODEL VIEW
Magnet dummies
Girder prototype
Concrete block
Amor NADJI IWBS2004 December 6-10, 2004 25
TEST BENCH : REAL VIEW
Amor NADJI IWBS2004 December 6-10, 2004 26
LOADED GIRDER RESULTS
3 modes of the dipoleMode1 :12.7 Hz
Ground mode
39 Hz
mode 1
44 Hz
modes 2 & 3
47 & 48.5 Hz
mode 7
103 Hz
mode 6
81 Hz
modes 4 & 5
57 & 60.5 Hz
dipole/girder
contact :
« Line-point-plan »
support
Amor NADJI IWBS2004 December 6-10, 2004 27
NEW MODE OF DIPOLE SUPPORT
(MORE) RIGID FIXATION
Amor NADJI IWBS2004 December 6-10, 2004 28
mode 1 46 Hzmode 1 of the Dipole
shifted to 27Hz
LOADED GIRDER RESULTS WITH RIGID FIXATION
mode 2 55 Hz
Amor NADJI IWBS2004 December 6-10, 2004 29
≤ 1 µm≤ 1 µmbunch pattern
≤ 3 µm≤ 3 µm1-month drift
≤ 1 µm≤ 1 µm8-h drift
≤ 1 µm≤ 1 µmCurrent dependence
20 - 600 mA20 - 600 mADynamic range
≥ 8 kHz10 HzMeasurement rate
≤ 0.2 µm in
100 Hz BW
≤ 0.2 µm @ 10 Hz
rms Resolution @ rep. rate
≤ 20 µm≤ 20 µmAbsolute accuracy
FOFBSOFB
BPM Electronics Requirements
ü Instrumentation Technologies
+ SOLEIL developments
BPM Electronic Module :
Libera from Instrumentation
Technologies
Amor NADJI IWBS2004 December 6-10, 2004 30
Acceptance Tests of Prototype Unit
v Goal : validate the hardware design before series production
v Acceptance test measurements :
– Electronics offsets ≤ 180 µm (easily subtracted via software)
– Stability during one night 1.5 µm in 12 hours (∆T = 1.5 °C)
– Stability due to Temperature variation 10 µm from 10 to 35 °C
– Check first turn lowest measurable current (Booster and Storage ring)
– Bunch pattern dependence (416 B; 8 B; 1 B) ≤ 2.5 µm (to be suppressed by software subtraction, being developed by I -T)
– Beam Current Dependence ≤ 8 µm (not a problem if Top-up, to be suppressed by software subtraction )
– Resolution at 700 Hz rate
v There is no real issue, we have good confident that these requirements can be achieved.
v Tests on table (at SOLEIL, this month) and with beam (at ESRF) are foreseen at the beginning of next year.
Amor NADJI IWBS2004 December 6-10, 2004 31
GLOBAL BEAM POSITION FEEDBACKS
Slow Orbit FeedBack (SOFB) 0 to ~ 0.01 Hz : to be ready for the commissioning
Ø Secondary coils in sextupoles
Ø 120 BPM SVD algorithm 56 H correctors and 56 V correctors and ∆fRF
Ø Aluminium vacuum chamber (eddy current, fcut ~ few Hz)
Fast Orbit FeedBack (FOFB) 0.01 to ~100 Hz : few months after the commissioning
Ø Dedicated FOFB network provides position data to all BPM modules
Ø Each BPM module (in its FPGA) computes one line of the correction matrix and sends the results to the correctors (8 kHz rate in Horizontal and Vertical)
Ø Fast air correctors are installed over the bellows (stainless steel vacuum chamber, fcut ~ few kHz)
Ø 120 BPM SVD algorithm 46 H and 46 V fast correctors (20 bits)
Ö Interaction between both FBs :
§ no frequency dead zone (à la ALS)
§ To avoid FBs fighting : SOFB communicates with FOFB
Amor NADJI IWBS2004 December 6-10, 2004 32
Air coil
Bellows
Supporting post in steel
Stainless steel
(may be later built in invar
or thermally stabilized to a
few 0.01°C)
BPM
Straight Section BPM Support
Amor NADJI IWBS2004 December 6-10, 2004 33
Slow Orbit FeedBack
Control Room
Dserver Profibus
Dserver CH,CVDserver CH,CVDserver HC, VC
Synch. few ms
1.1.1.1. ∆∆∆∆X = Xread -Xref
2.2.2.2. ∆∆∆∆I = R-1 ∆∆∆∆X
3. I = I0 + ∆∆∆∆I
@ 0.1 Hz
Dserver BPM1 Dserver BPM2 Dserver BPM120
Dserver derived
parametersDserver SOFB
Dserver orbit
<x>, xrms, …
Amor NADJI IWBS2004 December 6-10, 2004 34
Fast Orbit FeedBack
Network redundancy
46 correctors 120 BPM
Redundancy for the control of the correctors
Machine dedicated
network
FFB
Gbit link dedicatednetwork
DAC
ADCQDR
Fee dback
Matrix
Coefs
Go lden
Orbit
FaisceauFaisceau
BP M
steerer
DAC
ADCQDR
Fee dback
Matrix
Coefs
Go lden
Orbit
FaisceauFaisceau
BP M
steererI∆I
IDe-
HC HC
BPM BPM
Amor NADJI IWBS2004 December 6-10, 2004 35
FOFB : Command Control Scheme
Dserver BPM Dserver SteererDserver FOFB
Dserver SOFB
?
?
? ?
Control room
FPGA
1 to 120
1 to 46
(preliminary optimization)
Amor NADJI IWBS2004 December 6-10, 2004 36
ACKNOWLEDMENTS
I would like to thank many of my colleagues for many valuableand helpful discussions especially :
ü Jean Claude DENARD : BPM systemü Xavier GLARDON : Air conditioningü Jean-Luc Giorgetta : Measurements on Girdersü Nicolas HUBERT : Fast Orbit FeedBackü Alain Lestrade : Alignment, HLS system
ü Marie-Paule Level and the Machine Physics Group for general discussion.
Amor NADJI IWBS2004 December 6-10, 2004 37
ANNEXE
Amor NADJI IWBS2004 December 6-10, 2004 38
INFLUENCE OF THE CLAMPING SYSTEM
Frequency response for 3 values of the clamping force
Amor NADJI IWBS2004 December 6-10, 2004 39
Key issue : beneficial occupancy of the synchrotron building
• LINAC installation 20 September 2004
• Commissioning: February 2005
• Booster installation 15 December 2004
• S.R. installation March 2005
• Booster commissioning: April 2005
• S.R. commissioning: September 2005
•Phase 1 beamlines (11) opened to Users : Spring 2006
MILESTONES
Amor NADJI IWBS2004 December 6-10, 2004 40
SOLEIL in July 2004