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The antiprotons used in these experiments were cooled by decelerating them with the Antiproton Decelerator , passing them through a thin sheet of foil , and finally capturing them in a Penning–Malmberg trap .
 Penning–Malmberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Penning–Malmberg