摘要:

Using a photolithographic fabrication process microminiature Joule–Thomson refrigerators have been fabricated substantially smaller in size than hitherto and with refrigeration capacities of the order of 25 mW. The devices are 0.5×2×15 mm in size, they operate on nitrogen gas and cool to 88 K in 45 s. The fabrication process allows mass production of the devices at low cost. It was found that the theoretical models used for the design of the refrigerators are adequate at this level of miniaturization.

ISSN:0003-6951    

DOI:10.1063/1.93838

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

A novel photoconducting detector for time‐resolved measurements in the x‐ray region of the spectrum has been constructed. Time resolution of better than 40 ps at energies between 3 and 10 keV has been demonstrated in bunch length measurements on the Cornell Electron Storage Ring. At high beam currents, dramatic instabilities and a breakup of the electron bunch were directly observed with this detector.

ISSN:0003-6951    

DOI:10.1063/1.93839

出版商:AIP    

年代:1983

数据来源: AIP