Quality control and monitoring of radiation damage in charge coupled devices at the Stanford Linear Collider

The radiation testing of CCDs (charge coupled devices) for the vertex detector now installed at the SLAC (Stanford Linear Accelerator Center) Linear Collider is described. In addition to data from the batch qualification, results are also presented on the effect of biasing the CCDs during irradiation. A comparison between Co⁶⁰ and Sr⁹⁰ irradiation is made, and initial results for radiation effects in the vertex detector during operations are presented. It has been shown that commercial CCDs can be used as silicon tracking arrays in the radiation environment close to the interaction point at the SLC (SLAC Linear Collider). Measurements of reset FET turn-on potentials on the vertex detector in situ indicate an accumulated dose consistent with that extrapolated from remote dosimetry. Given the well-defined beam conditions that SLC now routinely maintains, these measurements indicate that the detector operation will not be significantly degraded during its lifetime