a) Length 1500mm，outer diameter 47mm，inner diameter 37mm, borosilicate 3. 3glass, absorbing layer Al-N/Al，absorptance>93%，vacuum isolation P<5x10-3 Pa，heat loss efficiency<0.8W/ ( m2℃ )，Max isolation temperature 260℃。
b) Length 1800mm，outer diameter 58mm，inner diamond 47mm, borosilicate 3.3glass absorbing layer Al-N/Al，absorptance>93%，vaccum isolation P<5x10-3 Pa，heat loss efficiency<0.8W/ ( m2oC )，Max isolation temperature 260℃。
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