Change In Experiment Will Delay Shuttle Launch 64
necro81 writes "A $1.5 billion gamma ray experiment, the Alpha Magnetic Spectrometer, that was to have launched aboard the space shuttle Endeavor to the International Space Station in July, has undergone a last minute design change that will change the launch date, pushing back the end of the shuttle program by at least several months. The change replaces the original liquid helium-cooled superconducting magnet with a more conventional one, which will reduce the risks involved (superconducting magnets can be problematic — just ask CERN) and will greatly extend the useful life of the spectrometer (the liquid helium coolant would have boiled away within a few years of launch). Although the conventional electromagnet is only 1/5th as strong, its increased lifespan should allow for substantially more science to be conducted, especially considering the ISS's extended mission life. As the change is still underway, the impact to the final shuttle schedule is not fully known."
Seriously? (Score:5, Interesting)
IAASIE (I am a space instrumentation engineer) and I really find such a major last minute decision hard to believe, seeing how long and detailed the flight model / integration tests are...
Re:Seriously? (Score:0, Interesting)
ting (guy who runs it) is a whackjob with political clout which is why he is ramming it through. he needs to be removed and the project flown as is. the project will be useless with no time for detailed testing thanks to tings change and the team blamed for its failure as usual.
-a lone engineer at cern.
Re:Seriously? (Score:4, Interesting)
IAASIE (I am a space instrumentation engineer) and I really find such a major last minute decision hard to believe, seeing how long and detailed the flight model / integration tests are...
Maybe they are actually swapping one validated unit for a different validated unit.
Contingency plans for X37B? (Score:4, Interesting)
Re:Seriously? (Score:3, Interesting)
I also find it hard to believe that someone would name a spectrometer designed to measure gammas the "alpha spectrometer."
Re:Seriously? (Score:5, Interesting)
High-temperature superconductor magnets? (Score:5, Interesting)
The case for intact equipment return (Score:5, Interesting)
AMS is one of the poster children for a capability that will be lost with the retirement of the shuttle, a capability many insist we don't need - intact equipment return.
The original plan was, when the cryogens ran out, to return AMS to Earth and rerun the pre launch calibration checks (essentially using a particle accelerator to shoot particles through the AMS) - not only allowing us to learn about the effects of the orbital environment, but also being able to apply the knowledge of those effects to the analysis of the science data collected on orbit.
Re:Seriously? (Score:4, Interesting)
Doubly so since the cryogens aren't the only limit on the experiment's lifetime. There's also the gas supply for the photomultiplier tubes, whose expected life I cannot find anywhere.
Re:Oh please (Score:3, Interesting)
There was no reason to use a manned launcher to orbit the Hubble.
For the cost of the repair mission and all the other worthless manned flights they could have put up 10 Hubbles.
Re:Space is cold (Score:3, Interesting)
If an object radiates away all its energy because it's in space, it doesn't get cold because space is cold. It gets cold because there's nothing there to radiate energy back into the object.
You can say that the stuff in space that isn't just empty space has a temperature, but it's so spread out that radiation becomes the dominant mode of heat transfer, and it has such little mass and is so cool that its black body radiation is meaningless. It is effectively not there for this interaction.
Re:Seriously? (Score:3, Interesting)