Browsing NTNU Open by Author "Winkler, Jan"
Now showing items 1-6 of 6
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Adaptive Nonlinear Control of the Czochralski Process Via Integration of Second Order Sliding Mode and Iterative Learning Control
Bukhari, Halima Zahra; Aftab, Muhammad Faisal; Hovd, Morten; Winkler, Jan (Chapter, 2017)This paper utilises nonlinear second-order sliding mode (SOSM) combined with an iterative learning control (ILC) scheme for the control of interface dynamics primarily focused on diameter control in the Czochralski (CZ) ... -
Design of parallel compensator and stabilizing controller to mitigate non-minimum phase behaviour of the Czochralski process
Bukhari, Syeda Halima Zahra; Hovd, Morten; Aftab, Muhammad Faisal; Winkler, Jan (Peer reviewed; Journal article, 2020)This paper addresses the design of a parallel compensator and a stabilizing controller for the simplified crystal growth dynamics of the Czochralski (CZ) process, i.e., the process for the production of monocrystalline ... -
Inverse response behaviour in the bright ring radius measurement of the Czochralski process I: Investigation
Bukhari, Syeda Halima Zahra; Hovd, Morten; Winkler, Jan (Peer reviewed; Journal article, 2021)This is the first part of a two-article series that deals with the investigation of the anomalous behaviour in the radius measurement signal of the Czochralski (Cz) process and its mitigation in a feedback control system. ... -
Inverse response behaviour in the bright ring radius measurement of the Czochralski process II: Mitigation by control
Bukhari, Syeda Halima Zahra; Hovd, Morten; Winkler, Jan (Peer reviewed; Journal article, 2021)This is the second part of a two-article series investigating the presence of an inverse response in the measurement of the ingot radius in the Czochralski process for monocrystalline silicon production, when the ingot ... -
Limitations on control performance in the Czochralski crystal growth process using bright ring measurement as a controlled variable
Bukhari, Halima Zahra; Hovd, Morten; Winkler, Jan (Journal article; Peer reviewed, 2019)This paper develops a dynamical model for crystal diameter in the Czochralski process for production of monocrystalline silicon. The model combines simplified crystal growth dynamics with rigorous ray tracing to describe ... -
Modeling and Control of the Czochralski Crystal Growth Process
Bukhari, Halima Zahra (Doctoral theses at NTNU;2021:269, Doctoral thesis, 2021)This thesis provides the basis for improved control of the Czochralski (Cz) process – a process used on a commercial scale to produce monocrystalline silicon (Si) ingots. This is done by developing a model for the crystal ...