Improved Spatial Resolution in Thick, Fully-Depleted CCDs withEnhanced Red Sensitivity
The point spread function (PSF) is an important measure ofspatial resolution in CCDs for point-like objects, since it can affectuse in imaging and spectroscopic applications. We present new data andtheoretical developments in the study of lateral charge diffusion inthick, fully-depleted charge-coupled devices (CCDs) developed at LawrenceBerkeley National Laboratory (LBNL). Because they are fully depleted, theLBNL devices have no field-free region, and diffusion can be controlledthrough the application of an external bias voltage. We give results fora 3512x3512 format, 10.5 ?m pixel back-illuminated p-channel CCDdeveloped for the SuperNova/ Acceleration Probe (SNAP), a proposedsatellite-based experiment designed to study dark energy. The PSF wasmeasured at substrate bias voltages between 3 V and 115 V. At a biasvoltage of 115V, we measure an rms diffusion of 3.7 +- 0.2 ?m. Lateralcharge diffusion in LBNL CCDs is thus expected to meet the SNAPrequirements.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of High Energy Physics
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 901815
- Report Number(s):
- LBNL-59107; R&D Project: PA1520; BnR: KA1503020; TRN: US0702669
- Resource Relation:
- Conference: IEEE Nuclear Science Symposium and MedicalImaging Conference, Puerto Rico,10/23/2005-10/29/2005
- Country of Publication:
- United States
- Language:
- English
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