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Re-aluminizing of 60cm mirror at Maidanak Observatory Kiichi Okita*, Takashi Ito**, Fumi Yoshida**, Seitaro Urakawa***, Kenshi Yanagisawa*, Daisuke Kuroda*,

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Presentation on theme: "Re-aluminizing of 60cm mirror at Maidanak Observatory Kiichi Okita*, Takashi Ito**, Fumi Yoshida**, Seitaro Urakawa***, Kenshi Yanagisawa*, Daisuke Kuroda*,"— Presentation transcript:

1 Re-aluminizing of 60cm mirror at Maidanak Observatory Kiichi Okita*, Takashi Ito**, Fumi Yoshida**, Seitaro Urakawa***, Kenshi Yanagisawa*, Daisuke Kuroda*, Hisashi Koyano*, Eiji Kanbe*, Shinobu Ozaki** (* Okayama Astrophysical Observatory of NAOJ, **NAOJ, ***Spaceguard) 2 nd Maidanak Observatory Users Meeting 2010.6.22 Date : 2010. 4. 12, 13 Done by : K.Okita, K.Yanagisawa, D.Kuroda, H.Koyano, E.Kanbe (Okayama) T. Ito, F. Yoshida, S. Urakawa (Asteroid group)

2 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by Sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

3 60cm mirror (before re-aluminizing) 50cm mirror (before re-aluminizing) Small mirrors (before re-aluminizing) Remove levels

4 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by Sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

5 Wash, wash !Remove old-aluminum by NaOH(10%) Polishing by Sodium Hydrogen Carbonate

6 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

7 Wipe mirrors using cotton cloth with alcohol

8 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by Sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

9 Set-up mirrors in the Vacuum ChamberLock the mirrors by chuck Closing the chamber 60cm mirror 60cm 50cm 20cm 15cm

10 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by Sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

11 Cryio-pump Filament for heat-up Aluminum Meissner-coil LqN2 flow into the copper pipe and Cool down, then trap water vapor in the chamber At the opposite side that installed mirrors, there are 36 filaments at the wall of the chamber.

12 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

13 Ion-bombardment Sputter aluminum from heated filament A window glass of vacuum chamber coated from inside with Aluminum

14 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by Sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

15 After re-aluminizing mirrors. 60cm, 50cm, small mirrors. 60cm main mirror 50cm main mirror

16 Re-Aluminizing sequence 1. Wash by water 2. Remove old aluminum by Sodium hydroxide(NaOH) 3. Polish by Sodium Hydrogen Carbonate ( 2NaHCO 3 ) 4. Wipe by cotton cloth with alcohol 5. Install mirror in the Vacuum chamber 6. Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3X10 -2 torr 20min.) 8. One more Pumping vacuum camber into 5X10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30min.) 10. Take out mirrors from chamber 11. Packing mirror to transportation box.

17 Pack mirrors in the box 60cm main mirror 50cm main mirror and small mirrors

18 Wyko NT1100 (Veeco co.) Height accuracy <0.3nm Measurement accuracy about ~ 1nm Measured 3 times each point Result : 130nm ~ 140nm Measurement of thickness 2010.5.13 by S. Ozaki (NAOJ) Preparation plate (Use 3 plates) Measurement point Preparation plate from the side view Aluminum


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