Data Acquisition Software for CMS HCAL Testbeams

Although CMS will not start operation for several years, many subdetector groups have active testbeam programs involving final or near-final electronics. The high-bandwidth electronics require the development of new DAQ systems including hardware and software. This paper presents the design and performance of the DAQ software used for the summer 2002 HCAL testbeam at CERN. This system successfully acquired over 80M testbeam events, running at rate of 200-1000 Hz. The paper also describes some of the developments made for the 2003 testbeam, including the integration of the CMS xDAQ framework.