TY  - CHAP
A1  - Schopp, Christoph
A1  - Nachtrodt, Frederik
A1  - Heuermann, Holger
A1  - Scherer, Ulrich W.
A1  - Mostacci, Domiziano
A1  - Finger, Torsten
A1  - Tietsch, Wolfgang
T1  - A novel 2.45 GHz/200 W Microwave Plasma Jet for High Temperature Applications above 3600 K
T2  - Journal of Physics : Conference Series
Y1  - 2012
SN  - 1742-6596
VL  - 406
IS  - 012029
ER  - 
TY  - CHAP
A1  - Ögun, Celal Mohan
A1  - Kling, Rainer
A1  - Heuermann, Holger
A1  - Gräser, Ulrich
A1  - Schopp, Christoph
T1  - Elektrodenlose quecksilberfreie Niederdrucklampen betrieben mit Mikrowellen
T2  - Licht 2014 [Elektronische Ressource] : Den Haag, Holland ; 21. Gemeinschaftstagung, 21. bis 24. September 2014 ; Tagungsband
Y1  - 2014
PB  - Nederlandse Stichting voor Verlichtingskunde
CY  - Ede
ER  - 
TY  - CHAP
A1  - Schopp, Christoph
A1  - Heuermann, Holger
T1  - Electrodeless low pressure lamp with bi-static matching at 2.45 GHz
T2  - 2013 European Microwave Conference (EuMC) , Nuremberg
Y1  - 2013
SN  - 978-1-4799-0264-4
SP  - 881
EP  - 884
PB  - IEEE
CY  - Piscataway, NJ
ER  - 
TY  - CHAP
A1  - Schopp, Christoph
A1  - Heuermann, Holger
A1  - Holtrup, S.
T1  - Investigation on efficacy optimization of RF-driven automotive D-lamps
T2  - 44th European Microwave Conference (EuMC),2014, Rome
Y1  - 2014
U6  - http://dx.doi.org/10.1109/EuMC.2014.6986645
SP  - 1154
EP  - 1157
ER  - 
TY  - JOUR
A1  - Schopp, Christoph
A1  - Doll, Timo
A1  - Gräser, Ulrich
A1  - Harzheim, Thomas
A1  - Heuermann, Holger
A1  - Kling, Rainer
A1  - Marso, Michael
T1  - Capacitively Coupled High-Pressure Lamp Using Coaxial Line Networks
JF  - IEEE Transactions on Microwave Theory and Techniques
N2  - This paper describes the development of a capacitively coupled high-pressure lamp with input power between 20 and 43 W at 2.45 GHz, using a coaxial line network. Compared with other electrodeless lamp systems, no cavity has to be used and a reduction in the input power is achieved. Therefore, this lamp is an alternative to the halogen incandescent lamp for domestic lighting. To serve the demands of domestic lighting, the filling of the lamp is optimized over all other resulting requirements, such as high efficacy at low induced powers and fast startups. A workflow to develop RF-driven plasma applications is presented, which makes use of the hot S-parameter technique. Descriptions of the fitting process inside a circuit and FEM simulator are given. Results of the combined ignition and operation network from simulations and measurements are compared. An initial prototype is built and measurements of the lamp's lighting properties are presented along with an investigation of the efficacy optimizations using large signal amplitude modulation. With this lamp, an efficacy of 135 lmW -1 is achieved.
Y1  - 2016
U6  - http://dx.doi.org/10.1109/TMTT.2016.2600326
SN  - 0018-9480
VL  - 64
IS  - 10
SP  - 3363
EP  - 3368
PB  - IEEE
CY  - New York, NY
ER  - 
TY  - CHAP
A1  - Schopp, Christoph
A1  - Heuermann, Holger
A1  - Marso, Michel
T1  - Multiphysical Study of an Atmospheric Microwave Argon Plasma Jet
T2  - IEEE Transactions on Plasma Science
Y1  - 2017
U6  - http://dx.doi.org/10.1109/TPS.2017.2692735
SN  - 1939-9375
VL  - 45
IS  - 6
SP  - 932
EP  - 937
PB  - IEEE
ER  - 
TY  - JOUR
A1  - Schopp, Christoph
A1  - Britun, Nikolay
A1  - Vorac, Jan
A1  - Synek, Petr
A1  - Snyders, Rony
A1  - Heuermann, Holger
T1  - Thermal and Optical Study on the Frequency Dependence of an Atmospheric Microwave Argon Plasma Jet
JF  - IEEE Transactions on Plasma Science
Y1  - 2019
SN  - 1939-9375
VL  - 47
IS  - 7
SP  - 3176
EP  - 3181
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Schopp, Christoph
A1  - Rohrbach, Felix
A1  - Langer, Luc
A1  - Heuermann, Holger
T1  - Detection of welding wire length by active S11 measurement
JF  - IEEE Transactions on Plasma Science
N2  - A novel method to determine the extruded length of a metallic wire for a directed energy deposition (DED) process using a microwave (MW) plasma jet with a straight-through wire feed is presented. The method is based on the relative comparison of the measured frequency response obtained by the large-signal scattering parameter (Hot-S) technique. In the practical working range, repeatability of less than 6% for a nonactive plasma and 9% for the active plasma state is found. Measurements are conducted with a focus on a simple solution to decrease the processing time and reduce the integration time of the process into the existing hardware. It is shown that monitoring a single frequency for magnitude and phase changes is sufficient to achieve good accuracy. A combination of different measurement values to determine the length is possible. The applicability to different diameter of the same material is shown as well as a contact detection of the wire and metallic substrate.
KW  - Circuit simulation
KW  - Hot S-parameter
KW  - Modeling
KW  - Plasma
KW  - Plasma diagnostics
Y1  - 2024
U6  - http://dx.doi.org/10.1109/TPS.2024.3356659
SN  - 0093-3813 (Print)
SN  - 1939-9375 (Online)
IS  - Early Access
SP  - 1
EP  - 6
PB  - IEEE
ER  -