Primary Brain Tumours and Lipids

First Results from a Microwave Cavity Axion Search at 24 μeV

“…Experimental design.-Our detector (discussed in greater detail in Ref. [17]) is housed in a cryogen-free dilution refrigerator integrated with a 9 T superconducting solenoid from Cryomagnetics, Inc. The cavity hangs in the magnet bore on a gantry anchored to the dilution refrigerator's mixing chamber plate, which is maintained at T C = 127 mK by electronic feedback.…”

“…The results reported in this Letter were obtained using the TM 010 mode between 5.7 and 5.8 GHz. Typical parameter values in this range are Q 0 3 × 10 4 and C 010 0.5; we set β 2 to optimize the scan rate [17].…”

“…These innovations resulted in total noise within a factor of 3 of the standard quantum limit, and an exclusion limit |g γ | 2.3 × g KSVZ γ over a 100 MHz frequency range. Further operation of this detector in the next few years will extend this frequency coverage significantly, and ongoing cavity and amplifier development [17,25] may even enable us to push down to KSVZ sensitivity. This work was supported by the National Science Foundation, under grants PHY-1362305 and PHY-1306729, by the Heising-Simons Foundation under grants 2014-181, 2014-182, and 2014-183, and by the U.S. Department of Energy through Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.…”