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M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 1
PETRA III – Damping Sections
Markus Tischer, HASYLAB 05.05.06
Damping wiggler sections
BINP / DESY cooperation on
• Damping wiggler
• Vacuum system
• Absorber
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 2
Damping section elements
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 3
Wiggler – Magnetic structureEndplate
Pole Non-magnetic spacerLong.magnet
Short prototype
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 4
Short prototype – Results
• Short prototype proves feasibility of magnetic and mechanical concept
• Measured peak field: 1.52 T
• Easy and fast tuning of all poles using the bolt correctors,only very little cross talk between poles, ~100G tuning range
• Magnets will get a fixation (although they would be stable in all mounting and operation states)
• Comparison of different magnet suppliers: Chinese magnets fully suitable; vendor: Chin. subsidiary of Arnold Magnets (US)
• Vanadium Permendur will be used as a pole material
• Still missing: size (& correction) of horizontal field integrals
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 5
Magnetic measurement equipment (1)
• Calibration magnet∆B/B < 10-5 within ±2.5cm at 1.5T NMR probe. Bmin=500G, sens. area ~0.5×0.5cm2
Hall probe array (~6cm wide) calibrated as a whole
• Solenoid setupintegral magnetic moments (similar to Helmholtz)field uniformity <10-4 (centre), <10-3 (corners) alignment error <0.1°
• Magnet inhomogeneityrelevant region: magnet side facing the gapmeasurement condition as in the assembled statemeasured with Hall probe or stretched wire
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 6
Magnetic measurement equipment (2)
• Hall probe setupHall probe array (7) attached to a rod position accuracy ~ 0.2mm sensitivity 10µV/G, measurement accuracy ~0.5G
new Hall probe array in fabrication, with also sensors above and below centre, implementation of transverse Hall plates
• Moving wireTotal field integrals with precision of ~10 Gcm (1st) and ~2000 Gcm2 (2nd)
to be completed within weeks
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 7
Long prototype (1) – Magnet quality
Magnet characterization of 180 blocks: good integral properties- high remanence with small scatter (~0.7%)- small systematic angular error (~0.2°) with a narrow distribution (<1°)
0
5
10
15
20
25
1320
013
240
1328
013
320
1336
013
400
1344
013
480
Mr (G)
Freq
uenc
y (L
ong.
mag
net)
02468
1012141618
-0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2
alpha (Deg)
Freq
uenc
y (L
ong.
mag
net)
02468
101214161820
-0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2
beta (Deg)
Freq
uenc
y (L
ong.
mag
net)
0
5
10
15
20
25
30
35
1340
013
440
1348
013
520
1356
013
600
1364
013
680
Mr (G)
Freq
uenc
y (S
ide
mag
net)
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 8
Long prototype (2) – Fabrication
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 9
Long prototype (3) – Magnetic dataPreliminary Hall probe results:
transverse field roll-off
-15
-10
-5
0
5
10
15
B [
kGs]
4003002001000Length [cm]
z0=255cm
±1cm10-3
x
1.5
1.0
0.5
0.0
-0.5
Horiz. A
ngle [mrad]
410400390380370Length [cm]
30
20
10
0
-10Int1
[10
e3 G
s cm
= T
mm
] x= -21 x= -14 x= -7 x= 0 x= 7 x= 14 x= 21mm
• measurements reproducible within 150Gcm after dis- & re-assembling the structure
• transverse field roll-off <10-3, ok.
• residual multipole contributions in field integralswill be corrected by magic fingers at both sides
• next: horizontal field datastretched wire measurements
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 10
Wigglers – Schedule
• overall delay of ~2 months up to now, but final completion on time• measurement equipment delayed• buffer time between successive steps is just sufficient• only a small safety margin in the schedule, e.g. to tolerate a delay
in the supply of special materials M
arch
Apr
il
May
June
July
Aug
ust
Sept
embe
r
Oct
ober
Nov
embe
r
Dec
embe
r
Janu
ary
Febr
uary
Mar
ch
Apr
il
May
June
July
Aug
ust
Sept
embe
r
Oct
ober
Nov
embe
r
Dec
embe
r
3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
PROCUREMENTPermendure
Permanent magnets 4 4 4 8PRODUCTIONYoke production-I 12Yoke production-II 8Wiggler production
DELIVERYWiggler delivery 5 4 4 4 4
20072006
(by Apr.’06)
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 11
Vacuum chambers (1) – Status
• preliminary design of allmajor chambers available
• further refinement due tomodifications in absorbergeometry and impedanceconsiderations
BPMBellows Quad
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 12
Vacuum chambers (2) – Status
• prototype of Al-extruded wiggler chamber fabricated,almost within mechanical specs extrusion matrix slightly corrected
• measured deformation under atmospheric pressure according tocalculations
• NEG coating license obtained • Tutorial at CERN planned
Maximum expected heat load(COD=1mm) on wiggler chamber (#9): ~1mW/mm2
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 13
Vacuum chambers (3) – Schedule
3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
DESIGN NEG Coating EquipmentAl chamber manufacturing drawingsAl chamber design approval by DESYFixing of the regular absorber design
Regular absorbersLump absorber
Lump absorber assembly toolingLong regular absorbers (9, 10).
Bellow, BPM, quad. Chamber, et.All supports
PROCUREMENT First delivery of bi-metalMain delivery of bi-metal
Copper and stainless steel Extrusion of all Al vacuum chamber
PRODUCTION NEG Coating Equipment ProductionAl vacuum chamber NEG coatingAl vacuum chamber production
Regular absorbersLong lump absorbers and tooling
Long regular absorbers (9, 10).Bellow, BPM, quad. Chamber, et.
All supports
DELIVERY Regular chambers, absorbers, supportsLong absorbers
20072006(by Apr.’06)
• Design phase delayedby a few months,delivery in time
• Decision on regularabsorber design neededsoon
• not much time reserve,delay may require parallelfabrication to keepschedule
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 14
Absorbers (1)
…
8 regular absorbers: < 20 kW each
2 long absorbers: à ~70 kW Lumped absorber: ~200 kW
Total power: ~400 kW / DW section
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 15
Absorbers (2)
-60 -40 -20 0 20 40 60
-5
0
5
X, mm
Z, m
m
Vacuum chamber
Absorber collimator (vertical apperture 9 mm)
Absorber collimator (vertical apperture 17 mm)
Odd absorber(vertical aperture 9mm)
Even absorber(vertical aperture 17mm)
Vacuum chamber
AB
Upstream end, absorberDownstream end, mask
Abs.No.
A, mm
Zmax, mm
B, mm
Absorber load, kW
Collimator load, kW
1 30 4.5 34.4 3.3 1.3 2 30 8.5 36.8 7.4 5.25 3 31.5 4.5 38.5 14.7 4.3 4 31.2 8.5 36.8 15.9 5.29 5 35.4 4.5 39.2 14.0 5.44 6 36.4 8.5 41.5 14.5 4.3 7 45.3 4.5 45.5 13.9 4.1 8 45.4 8.5 50.3 13 3.9 General design
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 16
Absorbers (3)
Regular Absorbers
• Reduction of variety of 8different absorber types(~equal power load of <15kW)
• Concept with only 2 absorbertypes is not sufficient
• Alternative: Extra absorbers for locations No. 7 and 8
• No. 1 can be omitted
• On-going investigations
Power load for ideal orbit (2 absorber types)
1 2 3 4 5 6 7 80
5
10
15
20
25
30
Absorber number
Abs
orbe
d po
wer
, kW
Mask loadAbsorber body loads
max. load
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 17
Installation etc.
• Work has been started onprocedures of transportation,installation, and alignment
• Previous PETRA transportationvehicle can be used
• Concrete supports with usualDESY adjustment systems willbe used
• Long lump absorbers: mutual dependence of availablespace, installation position, and absorber geometry…in progress
M. Tischer PETRA III – Damping Sections (MAC meeting, 05.05.06) 18
Wiggler – Gap separation
1. 2. 3.
4.
Vacuumchamber
Aux.support
Position for vacuumchamber activation
Wiggler in operation position
supportarm Gap drive
mechanics
Remove side wallSlide in wiggler
Openthe gap
rr