ICALEPCS2011 - List of Authors (Hughes, T.J.S.)

Paper

Title

Page

Solid State Direct Drive RF Linac: Control System

638

T. Kluge, M. Back, U. Hagen, O. Heid, M. Hergt, T.J.S. Hughes, R. Irsigler, J. Sirtl
Siemens AG, Erlangen, Germany
R. Fleck
Siemens AG, Corporate Technology, CT T DE HW 4, Erlangen, Germany
H.-C. Schröder
ASTRUM IT GmbH, Erlangen, Germany

Recently a Solid State Direct Drive ® concept for RF linacs has been introduced [1]. This new approach integrates the RF source, comprised of multiple Silicon Carbide (SiC) solid state Rf-modules [2], directly onto the cavity. Such an approach introduces new challenges for the control of such machines namely the non-linear behavior of the solid state RF-modules and the direct coupling of the RF-modules onto the cavity. In this paper we discuss further results of the experimental program [3,4] to integrate and control 64 RF-modules onto a λ/4 cavity. The next stage of experiments aims on gaining better feed forward control of the system and on detailed system identification. For this purpose a digital control board comprising of a Virtex 6 FPGA, high speed DACs/ADCs and trigger I/O is developed and integrated into the experiment and used to control the system. The design of the board is consequently digital aiming at direct processing of the signals. Power control within the cavity is achieved by an outphasing control of two groups of the RF-modules. This allows a power control without degradation of RF-module efficiency.
[1] Heid O., Hughes T., THPD002, IPAC10, Kyoto, Japan
[2] Irsigler R. et al, 3B-9, PPC11, Chicago IL, USA
[3] Heid O., Hughes T., THP068, LINAC10, Tsukuba, Japan
[4] Heid O., Hughes T., MOPD42, HB2010, Morschach, Switzerland

Slides WEBHMUST02 [1.201 MB]

Paper	Title	Page
WEBHMUST02	Solid State Direct Drive RF Linac: Control System	638
	T. Kluge, M. Back, U. Hagen, O. Heid, M. Hergt, T.J.S. Hughes, R. Irsigler, J. Sirtl Siemens AG, Erlangen, Germany R. Fleck Siemens AG, Corporate Technology, CT T DE HW 4, Erlangen, Germany H.-C. Schröder ASTRUM IT GmbH, Erlangen, Germany
	Recently a Solid State Direct Drive ® concept for RF linacs has been introduced [1]. This new approach integrates the RF source, comprised of multiple Silicon Carbide (SiC) solid state Rf-modules [2], directly onto the cavity. Such an approach introduces new challenges for the control of such machines namely the non-linear behavior of the solid state RF-modules and the direct coupling of the RF-modules onto the cavity. In this paper we discuss further results of the experimental program [3,4] to integrate and control 64 RF-modules onto a λ/4 cavity. The next stage of experiments aims on gaining better feed forward control of the system and on detailed system identification. For this purpose a digital control board comprising of a Virtex 6 FPGA, high speed DACs/ADCs and trigger I/O is developed and integrated into the experiment and used to control the system. The design of the board is consequently digital aiming at direct processing of the signals. Power control within the cavity is achieved by an outphasing control of two groups of the RF-modules. This allows a power control without degradation of RF-module efficiency. [1] Heid O., Hughes T., THPD002, IPAC10, Kyoto, Japan [2] Irsigler R. et al, 3B-9, PPC11, Chicago IL, USA [3] Heid O., Hughes T., THP068, LINAC10, Tsukuba, Japan [4] Heid O., Hughes T., MOPD42, HB2010, Morschach, Switzerland
	Slides WEBHMUST02 [1.201 MB]