|Description:|| Last year, the ALMA band 9 team started a European tender procedure for the production of three types of mirrors, for a total of 208. After an extensive procedure, the collaberation of ATH and ASTRON was rewarded with the assignment to produce these mirrors.|
Last week, the production started. It is set up in such way that the pre-milling of the 3 types of mirrors will be done without supervision during night-time or over the weekend.
In order to meet the rather extreme specifications for the mirror-surfaces, we will use a special high-speed tool with 90.000 rpm, which is equal to a dentist drill in XXL size. Within a year, several batches of mirrors will be produced. Depending on whether Japan will join the ALMA band 9 team, the final number will be up to 208-300 mirrors, at a total cost of 240-320 keuro.
ALMA (Atacama Large Millimeter Array) is a new aperture synthesis telescope that will operate at (sub-)mm wavelengths. The ALMA band 9 covers the area around 600 GHz (0.5 mm). See http://www.sron.rug.nl/alma/.
P.S. For acute toothache problems, you still better go to the dentist. We only treat toothache of giants (for free!!).