CCD Annealing

Radiation damage creates hot pixels in the STIS CCD Detector. Many of these hot pixels can be repaired by warming the CCD from its normal operating temperature near -83°C up to the ambient instrument temperature of about +5°C for several hours. Despite this annealing procedure, the number of permanently hot pixels has been increasing with time. These plots and reports document the evolution of hot pixels and the success of the annealing over time. Further details of the annealing procedure are given in STIS ISR 98-06.

Plots (updated 12-Jul-2004):

• Percentage of new pixels annealed
• Percentage of new pixels annealed for Side-1
• Percentage of new pixels annealed for Side-2
• Number of hot pixels remaining after anneal
• Percentage of hot pixels remaining after anneal
• Post-anneal mean raw dark rate
• Post-anneal median dark rate
• Post-anneal median dark rate for Side-1
• Post-anneal median dark rate for Side-2
• Hot pixel growth rate
• Hot pixel growth rate for Side-1
• Hot pixel growth rate for Side_2