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Design of Vacuum Chambers and Safety Aspects of a 56 kW Multipole Wiggler
Dirk Berger for the HMI Multipole Wiggler Group
BESSY II, Berlin Hahn-Meitner-Institute, BerlinV. Dürr D. BergerB. Franksen R. DaumB. Kuner H.D. KrauserJ. Kuszynski M. RoseJ. RahnE. Weihreter
Talk on the ESRF-Workshop on Superconducting Undulators & Wigglers 30.6. - 1.7.2003
Transp. 2: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Transp. 3: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Transp. 4: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Transp. 5: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Power density up to 600 W/cm2
Transp. 6: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Numerical Calculations
1) Heat load calc. with Wave, a code for the emergence and3D propagation of SR-radiation
2) FEM-calc. of temperature distribution in vacuum cham-bers and absorbers with Pro / Mechanica
3) FEM-calc. of stress and dis-placement of chambers withPro / Mechanica
Findings
1) Special Chamber material: CuAg0.1%
high conductivity, strength even close to melting point
2) Clever design
3) Protection of sensitive parts(bellows ...) by absorbers andbarriers
4) High efficiency cooling pipesclose to heat load
Transp. 7: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Transp. 8: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Numerical Calculations
1) Heat load calc. with Wave, a code for the emergence and3D propagation of SR-radiation
2) FEM-calc. of temperature distribution in vacuum cham-bers and absorbers with Pro / Mechanica
3) FEM-calc. of stress and dis-placement of chambers withPro / Mechanica
Findings
1) Special Chamber material: CuAg0.1%
high conductivity, strength even close to melting point
2) Clever design
3) Protection of sensitive parts(bellows ...) by absorbers andbarriers
4) High efficiency cooling pipesclose to heat load
Transp. 7: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
FEM-Calculations
Example 1: Temperature Distribution
-> max. surface temperature 150 °C
-> STATIC stresses below 50 N/mm2
Transp. 10: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
FEM-Calculations
Example 2: Displacement
calculated with Pro/Mechanica by Fa. PRETECH
-> max. displacement 0.35 mm
Transp. 11: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Numerical Calculations
1) Heat load calc. with Wave, a code for the emergence and3D propagation of SR-radiation
2) FEM-calc. of temperature distribution in vacuum cham-bers and absorbers with Pro / Mechanica
3) FEM-calc. of stress and dis-placement of chambers withPro / Mechanica
Findings
1) Special Chamber material: CuAg0.1%
high conductivity, strength even close to melting point
2) Clever design
3) Protection of sensitive parts(bellows ...) by absorbers andbarriers
4) High efficiency cooling pipesclose to heat load
Transp. 7: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Clever Design
Example : „Two-Wedge-Absorber“
Transp. 13: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
„Two-Wedge-Absorber“
Transp. 14: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Numerical Calculations
1) Heat load calc. with Wave, a code for the emergence and3D propagation of SR-radiation
2) FEM-calc. of temperature distribution in vacuum cham-bers and absorbers with Pro / Mechanica
3) FEM-calc. of stress and dis-placement of chambers withPro / Mechanica
Findings
1) Special Chamber material: CuAg0.1%
high conductivity, strength even close to melting point
2) Clever design
3) Protection of sensitive parts(bellows ...) by absorbers andbarriers
4) High efficiency cooling pipesclose to heat load
Transp. 15: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Protection of sensitive parts
Example: Protection barriers
Transp. 16: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Numerical Calculations
1) Heat load calc. with Wave, a code for the emergence and3D propagation of SR-radiation
2) FEM-calc. of temperature distribution in vacuum cham-bers and absorbers with Pro / Mechanica
3) FEM-calc. of stress and dis-placement of chambers withPro / Mechanica
Findings
1) Special Chamber material: CuAg0.1%
high conductivity, strength even close to melting point
2) Clever design
3) Protection of sensitive parts(bellows ...) by absorbers andbarriers
4) High efficiency cooling pipesclose to heat load
Transp. 17: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
18 Water Cooling Circuits
Transp. 18: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Scheme of Water Cooling Circuits
Transp. 19: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
34 24
Transp. 20: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
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Transp. 21: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
37
Transp. 22: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
19Local Display Control System
Transp. 23: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Interlock Scheme
Transp. 24: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Beam PositionInterlock
-> for extreme electrontrajectories thephoton beam mighthit uncooled vacuumchambers
a1 X10 + a2 X20 + a12 X10 - X20 > limitX
b1 Y10 + b2 Y20 + b12 Y10 - Y20 > limitY
Transp. 25: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Liquid Helium Refilling
Transp. 26: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
Conclusion
Be aware that high power superconducting Undulators andWigglers emit high heat load!
- FEM calculation of absorbers and vacuum chambers- Special chamber material- High efficient cooling- Water flow and temperature control- Beam position control- Liquid helium level control- Automatic and permanent control (Interlock)
Transp. 27: ESRF-Workshop on Superconducting Undulators & Wigglers 03; D. Berger, Hahn-Meitner-Institute, Berlin, berger@bessy.de
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