ICALEPCS2013 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
MOPPC096	Design and Implementation Aspects of the Control System at FHI FEL	controls, FEL, interface, EPICS	324
	H. Junkes, W. Schöllkopf, M. Wesemann FHI, Berlin, Germany R. Lange HZB, Berlin, Germany R. Lange AES, Princeton, New Jersey, USA
	A new mid-infrared FEL has been commissioned at the Fritz-Haber-Institut in Berlin. It will be used for spectroscopic investigations of molecules, clusters, nanoparticles and surfaces. The oscillator FEL is operated with 15 - 50 MeV electrons from a normal-conducting S-band linac equipped with a gridded thermionic gun and a chicane for controlled bunch compression. Construction of the facility building with the accelerator vault began in April 2010. First lasing was observed on Februar 15th, 2012. * The EPICS software framework was chosen to build the control system for this facility. The industrial utility control system is integrated using BACnet/IP. Graphical operator and user interfaces are based on the Control System Studio package. The EPICS channel archiver, an electronic logbook, a web based monitoring tool, and a gateway complete the installation. This paper presents design and implementation aspects of the control system, its capabilities, and lessons learned during local and remote commissioning. * W. Schöllkopf et al., FIRST LASING OF THE IR FEL AT THE FRITZ-HABER-INSTITUT, BERLIN, Conference FEL12
	Poster MOPPC096 [10.433 MB]

TUPPC031	Proteus: FRIB Configuration Database	database, controls, interface, operation	623
	V. Vuppala, E.T. Berryman NSCL, East Lansing, Michigan, USA L.R. Dalesio BNL, Upton, Long Island, New York, USA S. Peng FRIB, East Lansing, USA
	Distributed Information Services for Control Systems (DISCS) is a framework for developing high-level information systems for a Experimental Physics Facility. It comprises of a set of cooperating components. Each component of the system has a database, an API, and several applications. One of DISCS' core components is the Configuration Module. It is responsible for the management of devices, their layout, measurements, alignment, calibration, signals, and inventory. In this paper we describe FRIB's implementation of the Configuration Module - Proteus. We describe its architecture, database schema, web-based GUI, EPICS V4 and REST services, and Java/Python APIs. It has been developed as a product that other labs can download and use. It can be integrated with other independent systems. We describe the challenges to implementing such a system, our technology choices, and the lessons learnt.
	Poster TUPPC031 [1.248 MB]

THPPC072	Superconducting Cavity Quench Detection and Prevention for the European XFEL	operation, LLRF, cryogenics, coupling	1239
	J. Branlard, V. Ayvazyan, O. Hensler, H. Schlarb, Ch. Schmidt DESY, Hamburg, Germany W. Cichalewski TUL-DMCS, Łódź, Poland
	Due to its large scale, the European X-ray Free Electron Laser accelerator (XFEL) requires a high level of automation for commissioning and operation. Each of the 800 superconducting RF cavities simultaneously running during normal operation can occasionally quench, potentially tripping the cryogenic system and resulting into machine down-time. A fast and reliable quench detection system is then a necessity to rapidly detect individual cavity quenches and take immediate action, thus avoiding interruption of machine operation. In this paper, the mechanisms implemented in the low level RF system (LLRF) to prevent quenches and the algorithms developed to detect if a cavity quenches anyways are explained. In particular, the different types of cavity quenches and the techniques developed to identify them are shown. Experimental results acquired during the testing of XFEL cryomodules prototypes at DESY are presented, demonstrating the performance and efficiency of this machine operation and cavity protection tool.

THPPC122	High Performance and Low Latency Single Cavity RF Control Based on MTCA.4	controls, LLRF, feedback, hardware	1348
	Ch. Schmidt, L. Butkowski, M. Hoffmann, H. Schlarb DESY, Hamburg, Germany M. Grzegrzółka, I. Rutkowski Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
	The European XFEL project at DESY requires a very precise RF control, fulfilling the objectives of high performance FEL generation. Within the MTCA.4 based hardware framework a LLRF system has been designed to control multi-cavity applications, require large processing capabilities. A generic software structure allows to apply the same design also for single-cavity applications, reducing efforts for maintenance. It has be demonstrated that the MTCA.4 based LLRF controller development achieves XFEL requirement in terms of amplitude and phase control. Due to the complexity of the signal part, which is not essential for a single cavity regulation an alternative framework has been developed, to minimize processing latency which is especially for high bandwidth applications very important. This setup is based on a fast processing advanced mezzanine card (AMC) combined with a down-converter and vector-modulator rear transition module (RTM). Within this paper the system layout and first measurement results are presented, demonstrating capabilities not only for LLRF specific applications.

THPPC135	From Pulse to Continuous Wave Operation of TESLA Cryomodules – LLRF System Software Modification and Development	operation, feedback, LLRF, controls	1366
	W. Cichalewski, W. Jałmużna, A. Piotrowski, K.P. Przygoda TUL-DMCS, Łódź, Poland V. Ayvazyan, J. Branlard, H. Schlarb, J.K. Sekutowicz DESY, Hamburg, Germany J. Szewiński NCBJ, Świerk/Otwock, Poland
	Funding: We acknowledge the support from National Science Center (Poland) grant no 5593/B/T02/2010/39 Higher efficiency of TESLA based free electron lasers (FLASH, XFEL) by means of increased quantity of photon bursts can be achieved using continuous wave operation mode. In order to maintain constant beam acceleration in superconducting cavities and keep short pulse to CW operation transition costs reasonably low some substantial modification of accelerator subsystems are necessary. Changes in: RF power source, cryo systems, electron beam source, etc. have to be also accompanied by adjustments in LLRF system. In this paper challenges for well established pulsed mode LLRF system are discussed (in case of CW and LP scenarios). Firmware, software modifications needed for maintaining high performance of cavities field parameters regulation (for 1Hz CW and LP cryo-module operation) are described. Results from studies of vector sum amplitude and phase control in case of resonators high Ql factor settings (Ql~1.5e7) are shown. Proposed modifications implemented in VME and microTCA (MTCA.4) based LLRF system has been tested during studies at CryoModule Test Bench (CMTB) in DESY. Results from this tests together with achieved regulation performance data are also presented and discussed.
	Poster THPPC135 [1.310 MB]

FRCOBAB05	Distributed Feedback Loop Implementation in the RHIC Low Level RF Platform	LLRF, controls, damping, FPGA	1501
	F. Severino, M. Harvey, T. Hayes, G. Narayan, K.S. Smith BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DEAC02-98CH10886 with the U.S. Department of Energy. We present a brief overview of distributed feedback systems based on the RHIC LLRF Platform. The general architecture and sub-system components of a complex feedback system are described, emphasizing the techniques and features employed to achieve deterministic and low latency data and timing delivery between local and remote sub-systems: processors, FPGA fabric components and the high level control system. In particular, we will describe how we make use of the platform to implement a widely distributed multi-processor and FPGA based longitudinal damping system, which relies on task sharing, tight synchronization and integration to achieve the desired functionality and performance.
	Slides FRCOBAB05 [3.147 MB]

Paper

Title

Other Keywords

Page

MOPPC096

Design and Implementation Aspects of the Control System at FHI FEL

controls, FEL, interface, EPICS

324

H. Junkes, W. Schöllkopf, M. Wesemann
FHI, Berlin, Germany
R. Lange
HZB, Berlin, Germany
R. Lange
AES, Princeton, New Jersey, USA

A new mid-infrared FEL has been commissioned at the Fritz-Haber-Institut in Berlin. It will be used for spectroscopic investigations of molecules, clusters, nanoparticles and surfaces. The oscillator FEL is operated with 15 - 50 MeV electrons from a normal-conducting S-band linac equipped with a gridded thermionic gun and a chicane for controlled bunch compression. Construction of the facility building with the accelerator vault began in April 2010. First lasing was observed on Februar 15th, 2012. * The EPICS software framework was chosen to build the control system for this facility. The industrial utility control system is integrated using BACnet/IP. Graphical operator and user interfaces are based on the Control System Studio package. The EPICS channel archiver, an electronic logbook, a web based monitoring tool, and a gateway complete the installation. This paper presents design and implementation aspects of the control system, its capabilities, and lessons learned during local and remote commissioning.
* W. Schöllkopf et al., FIRST LASING OF THE IR FEL AT THE FRITZ-HABER-INSTITUT, BERLIN, Conference FEL12

Poster MOPPC096 [10.433 MB]

TUPPC031

Proteus: FRIB Configuration Database

database, controls, interface, operation

623

V. Vuppala, E.T. Berryman
NSCL, East Lansing, Michigan, USA
L.R. Dalesio
BNL, Upton, Long Island, New York, USA
S. Peng
FRIB, East Lansing, USA

Distributed Information Services for Control Systems (DISCS) is a framework for developing high-level information systems for a Experimental Physics Facility. It comprises of a set of cooperating components. Each component of the system has a database, an API, and several applications. One of DISCS' core components is the Configuration Module. It is responsible for the management of devices, their layout, measurements, alignment, calibration, signals, and inventory. In this paper we describe FRIB's implementation of the Configuration Module - Proteus. We describe its architecture, database schema, web-based GUI, EPICS V4 and REST services, and Java/Python APIs. It has been developed as a product that other labs can download and use. It can be integrated with other independent systems. We describe the challenges to implementing such a system, our technology choices, and the lessons learnt.

Poster TUPPC031 [1.248 MB]

THPPC072

Superconducting Cavity Quench Detection and Prevention for the European XFEL

operation, LLRF, cryogenics, coupling

1239

J. Branlard, V. Ayvazyan, O. Hensler, H. Schlarb, Ch. Schmidt
DESY, Hamburg, Germany
W. Cichalewski
TUL-DMCS, Łódź, Poland

Due to its large scale, the European X-ray Free Electron Laser accelerator (XFEL) requires a high level of automation for commissioning and operation. Each of the 800 superconducting RF cavities simultaneously running during normal operation can occasionally quench, potentially tripping the cryogenic system and resulting into machine down-time. A fast and reliable quench detection system is then a necessity to rapidly detect individual cavity quenches and take immediate action, thus avoiding interruption of machine operation. In this paper, the mechanisms implemented in the low level RF system (LLRF) to prevent quenches and the algorithms developed to detect if a cavity quenches anyways are explained. In particular, the different types of cavity quenches and the techniques developed to identify them are shown. Experimental results acquired during the testing of XFEL cryomodules prototypes at DESY are presented, demonstrating the performance and efficiency of this machine operation and cavity protection tool.

THPPC122

High Performance and Low Latency Single Cavity RF Control Based on MTCA.4

controls, LLRF, feedback, hardware

1348

Ch. Schmidt, L. Butkowski, M. Hoffmann, H. Schlarb
DESY, Hamburg, Germany
M. Grzegrzółka, I. Rutkowski
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland

The European XFEL project at DESY requires a very precise RF control, fulfilling the objectives of high performance FEL generation. Within the MTCA.4 based hardware framework a LLRF system has been designed to control multi-cavity applications, require large processing capabilities. A generic software structure allows to apply the same design also for single-cavity applications, reducing efforts for maintenance. It has be demonstrated that the MTCA.4 based LLRF controller development achieves XFEL requirement in terms of amplitude and phase control. Due to the complexity of the signal part, which is not essential for a single cavity regulation an alternative framework has been developed, to minimize processing latency which is especially for high bandwidth applications very important. This setup is based on a fast processing advanced mezzanine card (AMC) combined with a down-converter and vector-modulator rear transition module (RTM). Within this paper the system layout and first measurement results are presented, demonstrating capabilities not only for LLRF specific applications.

THPPC135

From Pulse to Continuous Wave Operation of TESLA Cryomodules – LLRF System Software Modification and Development

operation, feedback, LLRF, controls

1366

W. Cichalewski, W. Jałmużna, A. Piotrowski, K.P. Przygoda
TUL-DMCS, Łódź, Poland
V. Ayvazyan, J. Branlard, H. Schlarb, J.K. Sekutowicz
DESY, Hamburg, Germany
J. Szewiński
NCBJ, Świerk/Otwock, Poland

Funding: We acknowledge the support from National Science Center (Poland) grant no 5593/B/T02/2010/39
Higher efficiency of TESLA based free electron lasers (FLASH, XFEL) by means of increased quantity of photon bursts can be achieved using continuous wave operation mode. In order to maintain constant beam acceleration in superconducting cavities and keep short pulse to CW operation transition costs reasonably low some substantial modification of accelerator subsystems are necessary. Changes in: RF power source, cryo systems, electron beam source, etc. have to be also accompanied by adjustments in LLRF system. In this paper challenges for well established pulsed mode LLRF system are discussed (in case of CW and LP scenarios). Firmware, software modifications needed for maintaining high performance of cavities field parameters regulation (for 1Hz CW and LP cryo-module operation) are described. Results from studies of vector sum amplitude and phase control in case of resonators high Ql factor settings (Ql~1.5e7) are shown. Proposed modifications implemented in VME and microTCA (MTCA.4) based LLRF system has been tested during studies at CryoModule Test Bench (CMTB) in DESY. Results from this tests together with achieved regulation performance data are also presented and discussed.

Poster THPPC135 [1.310 MB]

FRCOBAB05

Distributed Feedback Loop Implementation in the RHIC Low Level RF Platform

LLRF, controls, damping, FPGA

1501

F. Severino, M. Harvey, T. Hayes, G. Narayan, K.S. Smith
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DEAC02-98CH10886 with the U.S. Department of Energy.
We present a brief overview of distributed feedback systems based on the RHIC LLRF Platform. The general architecture and sub-system components of a complex feedback system are described, emphasizing the techniques and features employed to achieve deterministic and low latency data and timing delivery between local and remote sub-systems: processors, FPGA fabric components and the high level control system. In particular, we will describe how we make use of the platform to implement a widely distributed multi-processor and FPGA based longitudinal damping system, which relies on task sharing, tight synchronization and integration to achieve the desired functionality and performance.

Slides FRCOBAB05 [3.147 MB]