Proton-Electron Telescope (PET)

PET consisted of an array of eight, lithium-drifted solid state detectors, together covering the energy range of 1--30 MeV for electrons, 18--85 Mev/nucleon for H and He, and 54--195 MeV/nucleon for the heavier elements. The geometric factors were about 1.0 cm**2-sr. H and He could be tracked into several hundred MeV/nucleon range, but with a reduced geometric factor of 0.3. The top-most detectors, P1 (convex) and P2 (concave) were each 2 mm thick, and had area of 8.1 cm**2. Downstream were the remaining, flat detectors P3 through P8, with the following dimensions. P3: 9.2 cm**2, 15 mm (compound stack of 5 3 mm detectors); and P4--P8: 4.5 cm**2, 3 mm. The instrument could be operated in a low gain (high-Z) mode or, ordinarily, in low-Z mode for observation of protons, electrons, and helium. Pulse height from the last-penetrated detector enabled determination of total E, and the upstream detectors provided dE/dx with enough redundancy to enable accurate determination of particle type. The counting rate of P1 was recorded with a resolution of 0.1 seconds, enabling observation of rapid time variations in the flux of precipitating electrons above energies of 0.4 MeV. (See IEEE Transactions on Geoscience and Remote Sensing, May 1993, vol 31, pp 565-574.) The instrument functioned normally as of 15 July 1996; the next update will be only when any significant status change occured.

PET（粒子能量测量系统）由八个锂漂移固态探测器阵列组成，覆盖了电子的1--30 MeV能量范围，氢和氦的18--85 MeV/nucleon能量范围，以及重元素的54--195 MeV/nucleon能量范围。其几何因子约为1.0 cm²-sr。氢和氦的探测可追踪至数百MeV/nucleon范围内，但几何因子有所降低，为0.3。最顶部的探测器P1（凸面）和P2（凹面）各厚2 mm，面积为8.1 cm²。下方是其余的平面探测器P3至P8，其尺寸如下：P3：9.2 cm²，15 mm（由5个3 mm探测器组成的复合堆叠）；P4至P8：4.5 cm²，3 mm。该仪器可在低增益（高Z）模式下或通常在低Z模式下运行，以观测质子、电子和氦。来自最后一个穿透探测器的脉冲高度可用来确定总能量E，而上游探测器提供了足够的dE/dx冗余，从而能够准确判定粒子类型。P1的计数率以0.1秒的分辨率进行记录，使得能够观测到超过0.4 MeV能量的降水电子通量中的快速时间变化。（参见《IEEE地球科学与遥感学报》，1993年5月，第31卷，第565-574页。）截至1996年7月15日，仪器运行正常；下一次更新仅会在发生任何重大状态变化时进行。