by
John R. Fischer, Senior Reporter | September 17, 2018
From the September 2018 issue of HealthCare Business News magazine
The downside is that temperature and pressure adjustments span a few days compared to the current repair method, which takes hours. This, however, can be an advantage, according to Deobil.
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Understanding and maintaining parts and components such
as Sumitomo's FA-70 'split' air-cooled compressor are crucial
to making sure coldheads are functioning properly.
“If a magnet has had a problem, manufacturers may want to control the timing of that cool-down, and they may also want to go through successive cool-downs and warm-ups,” he said. “This gives them the potential to recover a magnet that’s had a problem in the field.”
While potentially useful, experts agree that the best approach for maintaining, repairing or replacing a coldhead to its maximum potential and lifespan is to adhere to OEM specifications for chiller, compressor, and power requirements.
“When we do coldhead changes on a Siemens 4K magnet, the Siemens procedure says you have to ramp the magnet down to change the coldhead,” said Mykleby. “Obviously, that adds a significant expense to the change of the coldhead, and there are a lot of people out there changing the coldhead without ramping down the magnet. This, however, opens up the potential for getting ice into the magnet as well as quenching of the magnet. I would say the best thing is to just follow OEM procedures.”
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