Towards antihydrogen trapping and spectroscopy at ALPHA
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- 作者：1. Department of Physics ; Swansea University ; Swansea ; SA2 8PP UK2. Department of Physics and Astronomy ; Aarhus University ; DK-8000 Aarhus C ; Denmark3. Department of Physics ; Simon Fraser University ; Burnaby BC ; V5A 1S6 Canada4. Department of Physics ; University of California ; Berkeley ; CA 94720-7300 ; USA5. Instituto de F铆sica ; Universidade Federal do Rio de Janeiro ; Rio de Janeiro ; 21941-972 Brazil6. Department of Physics and Astronomy ; University of Calgary ; Calgary AB ; T2N 1N4 Canada7. TRIUMF ; 4004 Wesbrook Mall ; Vancouver ; BC V6T 2A3 ; Canada8. Department of Physics and Astronomy ; University of British Columbia ; Vancouver ; BC V6T 1Z4 ; Canada9. Department of Physics ; University of Tokyo ; Tokyo ; 113-0033 Japan10. Fysikum ; Stockholm University ; 10609 Stockholm ; Sweden11. Department of Physics and Astronomy ; York University ; Toronto ; ON M3J 1P3 ; Canada12. Department of Physics ; University of Liverpool ; Liverpool ; L69 7ZE UK13. Department of Physics ; Auburn University ; Auburn ; AL 36849-5311 ; USA14. Department of Physics ; NRCN-Nuclear Research Center Negev ; Beer Sheva ; 84190 Israel15. Atomic Physics Laboratory ; RIKEN Advanced Science Institute ; Wako ; Saitama ; 351-0198 Japan16. Graduate School of Arts and Sciences ; University of Tokyo ; Tokyo ; 153-8902 Japan
- 关键词：Antihydrogen – ; Antimatter – ; CPT – ; Penning trap – ; Atom trap
- 刊名：Hyperfine Interactions
- 出版时间：July 2011
- 出版年：2011
- 期刊代码：18_03043843
- 类别：cp
- 卷：199
- 期：1-3
- 页码：39-48
- 数据来源：sp
摘要
Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN’s Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques to directly measure the antiproton temperature and a new technique to cool them to below 10 K. We also show how our unique position-sensitive annihilation detector provides us with a highly sensitive method of identifying antiproton annihilations and effectively rejecting the cosmic-ray background.