The Beijing Electron Position Collider (BEPC) and the Beijing Spectrometer (BES) are upgrading now. The drift chamber is a very important detector in BES.

• 北京正负电子对撞机(BEPC)和北京谱仪(BES)正在升级改造中,漂移室(DC)是北京谱仪上最重要的子探测器之一。