DIPAC2011 - List of Keywords (status)

Paper	Title	Other Keywords	Page
MOPD66	Upgrade of the CERN PSB/CPS Fast Intensity Measurements	linac, synchrotron, proton, booster	200
	A. Monera Martinez, M. Andersen, D. Belohrad, L.K. Jensen, L. Søby CERN, Geneva, Switzerland G. Kasprowicz CREOTECH Ltd., Warsaw, Poland
	The CERN Proton Synchrotron Booster (PSB) and Proton Synchrotron (CPS) complex fast intensity measurement is undergoing a major upgrade. The old analogue electronics no longer provides enough accuracy, resolution and versatility to perform accurate beam intensity measurements. It has also become less reliable due to the ageing equipment. A new measurement system - Transformer Integrator Card (TRIC) - replaces these obsolete acquisition systems. TRIC is a generic platform used to measure the intensity in different transfer lines at CERN. Five TRICs were installed during the year 2010 in order to evaluate their performance with different beam types, from the low intensity pilot (5×10⁹ charges per bunch) to high intensity beams (1×10¹³ charges per bunch). The aim of this article is to present the technical aspects of the new system and the different measurement scenarios. It discusses possible sources of measurement errors and presents some statistical data acquired during this period.

MOPD90	Cause Identification of Beam Losses in PETRA III by Time Correlation of Alarms	undulator, beam-losses, dumping, power-supply	257
	T. Lensch, M. Werner DESY, Hamburg, Germany
	PETRA III is a high brilliant synchrotron light-source operating at 6 GeV at the DESY site in Hamburg. The Machine Protection System (MPS) of PETRA III is under operation since the beginning of the commissioning of PETRA III in April 2009. Under certain alarm conditions the MPS generates a dump command and protects the machine against damage. As a functional extension the MPS hardware examines the time correlation of alarm sequences after a beam loss. The alarm sequences are evaluated in a software based system so that the cause of a beam loss can be displayed in the control room immediately. This paper describes the hardware implementation as well as the software rules.
	Poster MOPD90 [0.548 MB]

TUPD35	Development of an Alternative, Photodiode-Based, Femtosecond Stable Detection Principle for the Link Stabilization in the Optical Synchronization Systems at FLASH and XFEL	laser, controls, FEL, feedback	380
	T. Lamb, M.K. Bock, M. Bousonville, M. Felber, P. Gessler, F. Ludwig, S. Ruzin, H. Schlarb, B. Schmidt, S. Schulz DESY, Hamburg, Germany
	Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285). The fs-stable timing information in the optical synchronization system at FLASH and the upcoming European XFEL is based on the distribution of laser pulses in optical fibers. The optical length of the fibers is continuously monitored and drifts in signal propagation time are actively compensated in order to provide a phase stable pulse train at the end of the fiber link. At present, optical cross-correlation is used to measure the optical length changes. To overcome some of the disadvantages of the current scheme, a different approach for the detection of the optical fiber link length variation was developed. This new scheme uses 10GHz photodiodes to measure the amplitude modulation of harmonics created by overlapping two pulse trains. The long-term stability of the prototype of this detector over 33h was demonstrated to be below 5fs (peak-to-peak) with a rms jitter of about 0.86fs. The detection principle itself is practically insensitive to environmental influences and needs only about 10% of the optical power, compared to the optical cross-correlator.

TUPD36	Progress and Status of the Laser-based Synchronization System at FLASH	laser, FEL, feedback, electron	383
	S. Schulz, M.K. Bock, M. Bousonville, M. Felber, P. Gessler, T. Lamb, F. Ludwig, S. Ruzin, H. Schlarb, B. Schmidt DESY, Hamburg, Germany
	Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285). The free-electron lasers FLASH and European XFEL demand a high timing accuracy between the electron bunches and external laser systems for both exploitation of the short VUV and X-ray pulses in time-resolved pump-probe experiments and seeded operation modes. The required precision can only be achieved with laser-based synchronization schemes. The prototype system installed at FLASH is continuously evolving and subject to improvements. In this paper, we give an overview on the present status, report on the latest developments and extensions, and discuss future challenges. Particularly, the recent move to a new type of master laser oscillator led to a significant enhancement of the robustness and reliability. Consequently, research can focus on the implementation of the electron bunch arrival time feedback, new technologies for timing distribution and integration of Ti:sapphire lasers into the optical synchronization system.

TUPD76	Vibration and Beam Motion Diagnostics in TLS	electron, photon, diagnostics, monitoring	485
	Y.K. Chen, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo NSRRC, Hsinchu, Taiwan
	High beam stability is essential in a modern synchrotron light source due to small emittance. Beam motion caused by various factors should be remedy by various approaches to achieve high beam stability. Vibration will deteriorate beam stability and need considered as a part of beam diagnostic. An integrated environment for beam orbit and vibration monitoring systems were set up for various studies. Implementation details and some beam observation will be presented in this report.
	Poster TUPD76 [2.750 MB]

TUPD96	Fast and Critical Detection Devices Planned for the Machine Protection System at the Facility for Rare Isotope Beams	linac, controls, EPICS, beam-losses	533
	G. Kiupel, S. Assadi, T.D. Brown, P. Chu, J.L. Crisp, S. Peng, M.W. Stettler, Y. Zhang FRIB, East Lansing, Michigan, USA
	Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) will use a 400 kW, heavy-ion cw linac to produce rare isotopes in support of a rich program of fundamental research. In the event of operational failures, the Machine Protection System (MPS) shuts off the beam within microseconds to control beam losses that may damage accelerator components. The operational mode is distributed to all fast and critical devices that have multiple hardware checkpoints and comparators. A relational database provides the framework for the development of the MPS management application. In this paper, we present the FRIB MPS architecture, plans and implementation.

Paper

Title

Other Keywords

Page

MOPD66

Upgrade of the CERN PSB/CPS Fast Intensity Measurements

linac, synchrotron, proton, booster

200

A. Monera Martinez, M. Andersen, D. Belohrad, L.K. Jensen, L. Søby
CERN, Geneva, Switzerland
G. Kasprowicz
CREOTECH Ltd., Warsaw, Poland

The CERN Proton Synchrotron Booster (PSB) and Proton Synchrotron (CPS) complex fast intensity measurement is undergoing a major upgrade. The old analogue electronics no longer provides enough accuracy, resolution and versatility to perform accurate beam intensity measurements. It has also become less reliable due to the ageing equipment. A new measurement system - Transformer Integrator Card (TRIC) - replaces these obsolete acquisition systems. TRIC is a generic platform used to measure the intensity in different transfer lines at CERN. Five TRICs were installed during the year 2010 in order to evaluate their performance with different beam types, from the low intensity pilot (5×10⁹ charges per bunch) to high intensity beams (1×10¹³ charges per bunch). The aim of this article is to present the technical aspects of the new system and the different measurement scenarios. It discusses possible sources of measurement errors and presents some statistical data acquired during this period.

MOPD90

Cause Identification of Beam Losses in PETRA III by Time Correlation of Alarms

undulator, beam-losses, dumping, power-supply

257

T. Lensch, M. Werner
DESY, Hamburg, Germany

PETRA III is a high brilliant synchrotron light-source operating at 6 GeV at the DESY site in Hamburg. The Machine Protection System (MPS) of PETRA III is under operation since the beginning of the commissioning of PETRA III in April 2009. Under certain alarm conditions the MPS generates a dump command and protects the machine against damage. As a functional extension the MPS hardware examines the time correlation of alarm sequences after a beam loss. The alarm sequences are evaluated in a software based system so that the cause of a beam loss can be displayed in the control room immediately. This paper describes the hardware implementation as well as the software rules.

Poster MOPD90 [0.548 MB]

TUPD35

Development of an Alternative, Photodiode-Based, Femtosecond Stable Detection Principle for the Link Stabilization in the Optical Synchronization Systems at FLASH and XFEL

laser, controls, FEL, feedback

380

T. Lamb, M.K. Bock, M. Bousonville, M. Felber, P. Gessler, F. Ludwig, S. Ruzin, H. Schlarb, B. Schmidt, S. Schulz
DESY, Hamburg, Germany

Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285).
The fs-stable timing information in the optical synchronization system at FLASH and the upcoming European XFEL is based on the distribution of laser pulses in optical fibers. The optical length of the fibers is continuously monitored and drifts in signal propagation time are actively compensated in order to provide a phase stable pulse train at the end of the fiber link. At present, optical cross-correlation is used to measure the optical length changes. To overcome some of the disadvantages of the current scheme, a different approach for the detection of the optical fiber link length variation was developed. This new scheme uses 10GHz photodiodes to measure the amplitude modulation of harmonics created by overlapping two pulse trains. The long-term stability of the prototype of this detector over 33h was demonstrated to be below 5fs (peak-to-peak) with a rms jitter of about 0.86fs. The detection principle itself is practically insensitive to environmental influences and needs only about 10% of the optical power, compared to the optical cross-correlator.

TUPD36

Progress and Status of the Laser-based Synchronization System at FLASH

laser, FEL, feedback, electron

383

S. Schulz, M.K. Bock, M. Bousonville, M. Felber, P. Gessler, T. Lamb, F. Ludwig, S. Ruzin, H. Schlarb, B. Schmidt
DESY, Hamburg, Germany

Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285).
The free-electron lasers FLASH and European XFEL demand a high timing accuracy between the electron bunches and external laser systems for both exploitation of the short VUV and X-ray pulses in time-resolved pump-probe experiments and seeded operation modes. The required precision can only be achieved with laser-based synchronization schemes. The prototype system installed at FLASH is continuously evolving and subject to improvements. In this paper, we give an overview on the present status, report on the latest developments and extensions, and discuss future challenges. Particularly, the recent move to a new type of master laser oscillator led to a significant enhancement of the robustness and reliability. Consequently, research can focus on the implementation of the electron bunch arrival time feedback, new technologies for timing distribution and integration of Ti:sapphire lasers into the optical synchronization system.

TUPD76

Vibration and Beam Motion Diagnostics in TLS

electron, photon, diagnostics, monitoring

485

Y.K. Chen, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo
NSRRC, Hsinchu, Taiwan

High beam stability is essential in a modern synchrotron light source due to small emittance. Beam motion caused by various factors should be remedy by various approaches to achieve high beam stability. Vibration will deteriorate beam stability and need considered as a part of beam diagnostic. An integrated environment for beam orbit and vibration monitoring systems were set up for various studies. Implementation details and some beam observation will be presented in this report.

Poster TUPD76 [2.750 MB]

TUPD96

Fast and Critical Detection Devices Planned for the Machine Protection System at the Facility for Rare Isotope Beams

linac, controls, EPICS, beam-losses

533

G. Kiupel, S. Assadi, T.D. Brown, P. Chu, J.L. Crisp, S. Peng, M.W. Stettler, Y. Zhang
FRIB, East Lansing, Michigan, USA

Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) will use a 400 kW, heavy-ion cw linac to produce rare isotopes in support of a rich program of fundamental research. In the event of operational failures, the Machine Protection System (MPS) shuts off the beam within microseconds to control beam losses that may damage accelerator components. The operational mode is distributed to all fast and critical devices that have multiple hardware checkpoints and comparators. A relational database provides the framework for the development of the MPS management application. In this paper, we present the FRIB MPS architecture, plans and implementation.