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Improvement of indirect slumping technology by using a pressure frame Mingwu Wen, Laura Proserpio, Peter Friedrich Max-Plank-Institute for Extraterrestrial.

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Presentation on theme: "Improvement of indirect slumping technology by using a pressure frame Mingwu Wen, Laura Proserpio, Peter Friedrich Max-Plank-Institute for Extraterrestrial."— Presentation transcript:

1 Improvement of indirect slumping technology by using a pressure frame Mingwu Wen, Laura Proserpio, Peter Friedrich Max-Plank-Institute for Extraterrestrial Physics Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015

2 New mouldsTest in vacuum Test with pressure frame INTRAAST project (with HAB) Integration facility improved prototypes JIM module ( with INAF- OAB) JIM in PANTER vibration tests entrapped air ?

3 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 CeSiC mould D263 glass Pumping system Pressure frame Before slumping The electric oven in MPE with pumping system Mould  CeSiC  Concave Wolter I shape (PAR+HYP)  160 mm x 260 mm  CTE: 2.4 x 10 -6 m/(mK) Glass  Schott D263  290 x 190 x 0.55 (0.4) mm 3  Tannealing 557°C  CTE: 7.2 x 10 -6 m/(mK) Pressure frame  Steel  CTE: 13.0 x 10 -6 m/(mK) SLUMPING LABORATORIES and TOOLS @ MPE

4 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 After slumping SLUMPING LABORATORIES and TOOLS @ MPE Metrology facility: 3D high precision measuring table equiped with optical sensor  optical sensor  600 µm measuring range  20 nm resolution in z  glasses kept in place on a 3-points support, gravity effect as derived by FEM subtracted  Correction of T-variation effect CHR on lpkf 3-points support glass Optical sensor z

5 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 Gravity correction Measured shape  Dim. : 200 mm x 100 mm x 0.55 mm  Range: -20µm to 4 µm Shape variation caused by gravity using 3-points support

6 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 Temperature-variation correction T-variation Z-variation scan direction T-variation effects are subtracted for long time scan.

7 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 Application of pressure PF7 PF10 PF9 PF8 PF11 PF12 PF6 Annealing T T max Group 1: Effect of Cleaning Group 2: Effect of pressure time, glass thick.:0.55mm Group 3: Effect of glass thickness glass thick.:0.40mm

8 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 Group 1 : Cleaning  Focal length:7500.00 mm  Radius: 374.157 mm  Alpha: 0.7132° Nominal parameters of the mould Cleaning improved  Middle frequency errors are reduced with better cleaning  New long scale errors are introduced PF test 6PF test 7

9 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 Group 2,3 : Pressure time and glass thickness Z: - 50 µm ~5 0 µm PF7 PF8 PF9 PF10 PF11 PF12 The long scale error increased with longer pressure time especially in the central part of the glasses

10 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 Fitted radius of the mirrors Fitted focal length of the mirrors 7 PF7PF8PF9PF10 PF11 PF12 PF7PF8PF9PF10 PF11 PF12

11 Max-Planck-Institute for Extraterrestrial Physics (MPE) December 09,2015 D263 glass CeSiC mould Pressure frame Kink getting stronger with longer pressure time shrink Long-time pressure PF8 PF10 Further work…  Optimize the gap to decrease the kink  Improve the cleaning  Improve the thermal cycle curve Thanks! gap


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