Markus Tischer, HASYLAB 05.05 · 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

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


Damping section elements


Wiggler – Magnetic structureEndplate

Pole Non-magnetic spacerLong.magnet

Short prototype


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


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


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


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)


Long prototype (2) – Fabrication


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


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)


Vacuum chambers (1) – Status

• preliminary design of allmajor chambers available

• further refinement due tomodifications in absorbergeometry and impedanceconsiderations

BPMBellows Quad


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


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


Absorbers (1)

…

8 regular absorbers: < 20 kW each

2 long absorbers: à ~70 kW Lumped absorber: ~200 kW

Total power: ~400 kW / DW section


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


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


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


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

Documents

Markus Tischer, HASYLAB 05.05 · 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