Publications by Johan Fopma


Planar transformers for column parallel CCD clock drive

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 609 (2009) 122-128

B Hawes, D Cussans, C Damerell, E Devetak, J Fopma, R Gao, J Goldstein, T Greenshaw, S Hillert, N Kundu, A Nomerotski, C Perry, K Stefanov, S Thomas, S Worm

The LCFI Collaboration is developing the sensors, readout electronics and mechanical support structures for the Vertex Detector (VXD) of the International Linear Collider (ILC). High-speed readout is needed to ensure that the occupancy due to the pair production background at the ILC is kept below 1% level. In order to satisfy this requirement, Column Parallel CCDs (CPCCDs) and Column Parallel Readout chips (CPRs) have been developed. The CPCCD has to operate at a clock frequency of 50 MHz, which represents a difficult technical challenge due to the relatively large sensor capacitance. The design and performance of planar transformers, which can be used to provide the required 20 A clock current, are described. © 2009 Elsevier B.V. All rights reserved.


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