PETRA III Damping Sections

Transcription

1 PETRA III Damping Sections Markus Tischer, HASYLAB Damping wiggler sections BINP / DESY cooperation on Damping wiggler Vacuum system Absorber M. Tischer PETRA III Damping Sections (MAC meeting, ) 1

2 Damping section elements M. Tischer PETRA III Damping Sections (MAC meeting, ) 2

3 Wiggler Magnetic structure End plate Pole Long. magnet Non-magnetic spacer Short prototype M. Tischer PETRA III Damping Sections (MAC meeting, ) 3

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, ) 4

5 Magnetic measurement equipment (1) Calibration magnet B/B < 10-5 within ±2.5cm at 1.5T NMR probe. B min =500G, sens. area ~ cm 2 Hall probe array (~6cm wide) calibrated as a whole Solenoid setup integral magnetic moments (similar to Helmholtz) field uniformity <10-4 (centre), <10-3 (corners) alignment error <0.1 Magnet inhomogeneity relevant region: magnet side facing the gap measurement condition as in the assembled state measured with Hall probe or stretched wire M. Tischer PETRA III Damping Sections (MAC meeting, ) 5

6 Magnetic measurement equipment (2) Hall probe setup Hall 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 wire Total field integrals with precision of ~10 Gcm (1 st ) and ~2000 Gcm 2 (2 nd ) to be completed within weeks M. Tischer PETRA III Damping Sections (MAC meeting, ) 6

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 ) Frequency (Long. magnet) Mr (G) Frequency (Long. magnet) alpha (Deg) Frequency (Side magnet) Mr (G) Frequency (Long. magnet) beta (Deg) M. Tischer PETRA III Damping Sections (MAC meeting, ) 7

8 Long prototype (2) Fabrication M. Tischer PETRA III Damping Sections (MAC meeting, ) 8

9 Long prototype (3) Magnetic data Preliminary Hall probe results: B [kgs] transverse field roll-off 10-3 ±1cm z 0 =255cm Length [cm] x measurements reproducible within 150Gcm after dis- & re-assembling the structure transverse field roll-off <10-3, ok. residual multipole contributions in field integrals will be corrected by magic fingers at both sides next: horizontal field data stretched wire measurements Int1 [10e3 Gs cm = Tmm] x= -21 x= -14 x= -7 x= 0 x= 7 x= 14 x= 21mm Length [cm] Horiz. Angle [mrad] M. Tischer PETRA III Damping Sections (MAC meeting, ) 9

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 March April May June July August September October November December January February March April May June July August September October November December PROCUREMENT Permendure Permanent magnets PRODUCTION Yoke production-i 12 Yoke production-ii 8 Wiggler production DELIVERY (by Apr. 06) Wiggler delivery M. Tischer PETRA III Damping Sections (MAC meeting, ) 10

11 Vacuum chambers (1) Status preliminary design of all major chambers available further refinement due to modifications in absorber geometry and impedance considerations Bellows Quad BPM M. Tischer PETRA III Damping Sections (MAC meeting, ) 11

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 to calculations NEG coating license obtained Tutorial at CERN planned Maximum expected heat load (COD=1mm) on wiggler chamber (#9): ~1mW/mm 2 M. Tischer PETRA III Damping Sections (MAC meeting, ) 12

13 Vacuum chambers (3) Schedule (by Apr. 06) DESIGN PROCUREMENT PRODUCTION DELIVERY NEG Coating Equipment Al chamber manufacturing drawings Al chamber design approval by DESY Fixing of the regular absorber design Regular absorbers Lump absorber Lump absorber assembly tooling Long regular absorbers (9, 10). Bellow, BPM, quad. Chamber, et. All supports First delivery of bi-metal Main delivery of bi-metal Copper and stainless steel Extrusion of all Al vacuum chamber NEG Coating Equipment Production Al vacuum chamber NEG coating Al vacuum chamber production Regular absorbers Long lump absorbers and tooling Long regular absorbers (9, 10). Bellow, BPM, quad. Chamber, et. All supports Regular chambers, absorbers, supports Long absorbers Design phase delayed by a few months, delivery in time Decision on regular absorber design needed soon not much time reserve, delay may require parallel fabrication to keep schedule M. Tischer PETRA III Damping Sections (MAC meeting, ) 13

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, ) 14

15 Absorbers (2) Upstream end, absorber Downstream end, mask A B Z, mm X, mm Vacuum chamber Absorber Even absorber collimator Absorber Odd absorber collimator (vertical apperture aperture 1717mm) (vertical apperture aperture 9 9mm) Abs. No. A, mm Z max, mm B, mm Absorber load, kw Collimator load, kw General design M. Tischer PETRA III Damping Sections (MAC meeting, ) 15

16 Absorbers (3) Regular Absorbers Reduction of variety of 8 different absorber types (~equal power load of <15kW) Power load for ideal orbit (2 absorber types) Mask load Absorber body loads Concept with only 2 absorber types is not sufficient Alternative: Extra absorbers for locations No. 7 and 8 Absorbed power, kw max. load No. 1 can be omitted 5 On-going investigations Absorber number M. Tischer PETRA III Damping Sections (MAC meeting, ) 16

17 Installation etc. Work has been started on procedures of transportation, installation, and alignment Previous PETRA transportation vehicle can be used Concrete supports with usual DESY adjustment systems will be used Long lump absorbers: mutual dependence of available space, installation position, and absorber geometry in progress M. Tischer PETRA III Damping Sections (MAC meeting, ) 17

18 Wiggler Gap separation 1. chamber activation Vacuum chamber Position for vacuum Open the gap Remove side wall Slide in wiggler Aux. support support arm Gap drive mechanics 4. Wiggler in operation position r M. Tischer PETRA III Damping Sections (MAC meeting, ) 18