在AEGIS实验中用于抗溶检测的低温跟踪检测器

论文标题

在AEGIS实验中用于抗溶检测的低温跟踪检测器

A cryogenic tracking detector for antihydrogen detection in the AEgIS experiment

论文作者

Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R. S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Ekman, P. A., Fani, M., Ferragut, R., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Hackstock, P., Haider, D., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnicky, D., Lagomarsino, V., Malbrunot, C., Mariazzi, S., Matveev, V., Muller, S. R., Nebbia, G., Nedelec, P., Nowak, L., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Rohne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Storey, J., Testera, G., Tietje, I. C., Toso, V., Wolz, T., Wuethrich, J., Yzombard, P., Zimmer, C., Zurlo, N.

论文摘要

我们介绍了在AEGIS实验的1 T超导磁体内安装的快速歼灭低温追踪器检测器（FACT）。事实旨在检测源自抗抗蛋白酶的腐蚀。它的794个闪烁纤维在4 K下运行，并在近室温下由硅光电塑料（MPPC）读出。事实提供了一些NS时正时分辨率的抗抗原/抗溶解位置信息。我们提出了硬件和软件开发，从而导致检测器成功地进行抗溶检测和基于抗抑制剂的效率评估的结果。抗氢信号的主要背景是撞击正电子转化靶标的正电子的，并产生大量的伽马射线，这些伽马射线在预期抗溶毒信号之前不久在MPPC中产生较大的信号。我们详细介绍了该背景信号的表征及其对抗氢检测效率的影响。

We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1 T superconducting magnet of the AEgIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4 K and are read out by silicon photomultipliers (MPPCs) at near room temperature. FACT provides the antiproton/antihydrogen annihilation position information with a few ns timing resolution. We present the hardware and software developments which led to the successful operation of the detector for antihydrogen detection and the results of an antiproton-loss based efficiency assessment. The main background to the antihydrogen signal is that of the positrons impinging onto the positronium conversion target and creating a large amount of gamma rays which produce a sizeable signal in the MPPCs shortly before the antihydrogen signal is expected. We detail the characterization of this background signal and its impact on the antihydrogen detection efficiency.

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