Design and Testing of 100 mK High-voltage Electrodes for AEgIS

J.H. Derking*, J. Liberadzka, T. Koettig, J. Bremer

*Corresponding author for this work

Research output: Contribution to journalConference articleAcademicpeer-review

2 Citations (Scopus)
44 Downloads (Pure)

Abstract

The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment at CERN has as main goal to perform the first direct measurement of the Earth's gravitational acceleration on antihydrogen atoms within 1% precision. To reach this precision, the antihydrogen should be cooled down to about 100 mK to reduce its random vertical velocity. This is obtained by mounting a Penning trap consisting of multiple high-voltage electrodes on the mixing chamber of a dilution refrigerator with cooling capacity of 100 μW at 50 mK. A design of the high-voltage electrodes is made and experimentally tested at operating conditions. The high-voltage electrodes are made of sapphire with four gold sputtered electrode sectors on it. The electrodes have a width of 40 mm, a height of 18 mm and a thickness of 5.8 mm and for performance testing are mountedto the mixing chamber of a dilution refrigerator with a 250 μm thick indium foil sandwiched inbetween the two to increase the thermal contact. A static heat load of 120 nW applied to the top surface of the electrode results in a maximum measured temperature of 100 mK while the mixing chamber is kept at a constant temperature of 50 mK. The measured totalthermal resistivity lies in the range of 210-260 cm2 K4 W−1, which is much higher than expected from literature. Further research needs to be done to investigate this
Original languageEnglish
Pages (from-to)576-581
Number of pages6
JournalPhysics procedia
Volume67
DOIs
Publication statusPublished - 2015
Event25th International Cryogenic Engineering Conference & International Cryogenic Materials Conference, ICEC/ICMC 2014 - University of Twente, Enschede, Netherlands
Duration: 7 Jul 201411 Jul 2014
Conference number: 25
https://indico.cern.ch/event/244641/

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