DIPAC2011 - List of Keywords (collider)

Paper	Title	Other Keywords	Page
MOPD40	Beam Measurements with Visible Synchrotron Light at VEPP-2000 Collider	controls, diagnostics, electron, positron	140
	Yu. A. Rogovsky, D.E. Berkaev, I. Koop, A.N. Kyrpotin, I. Nesterenko, A.L. Romanov, Y.M. Shatunov, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia
	This paper describes beam diagnostics at VEPP-2000 collider, based on visible synchrotron light analysis. These beam instruments include: SR beamline and optics; acquisition tools and high resolution CCD cameras distributed around the storage ring to measure the transverse beam profile and its position in vacuum chamber; photomultiplier tubes (PMT) which enables beam current measurements. Some applications of these measurement systems and their measurement results are presented.
	Poster MOPD40 [0.599 MB]

MOPD44	Self Testing Functionality of the LHC BLM System	high-voltage, monitoring, injection, diagnostics	152
	J. Emery, B. Dehning, E. Effinger, A. Nordt, C. Zamantzas CERN, Geneva, Switzerland
	Reliability concerns have driven the design of the LHC BLM system throughout its development, from the early conceptual stage right through the commissioning phase and up to the latest development of diagnostic tools. To protect the system against non-conformities, new ways of automatic checking have been developed and implemented. These checks are regularly and systematically executed by the LHC operation team to insure that the system status after each test is "as good as new". This checks the electrical part of the detectors (ionisation chamber or secondary emission monitor), their cable connections to the front-end electronics, the connections to the back-end electronics and their ability to request a beam abort. During the installation and in the early commissioning phase, these checks proved invaluable in finding non-conformities caused by unexpected failures. This paper will describe these checks in detail, commenting on the latest performance and the typical non-conformities detected. A statistical analysis of the LHC BLM system will also be presented to show the evolution of the various system parameters.
	Poster MOPD44 [2.068 MB]

MOPD68	Pickup Beam Measurement System at the VEPP-2000 Collider	betatron, injection, controls, positron	203
	Yu. A. Rogovsky, E.A. Bekhtenev BINP SB RAS, Novosibirsk, Russia
	This paper reviews the present state of electromagnetic beam position monitors (pickups) at VEPP-2000 collider. It includes descriptions of position monitors, typical interfaces for these monitors and their system characteristics (resolution, stability, bandwidth and problems or limitations) are discussed. The paper also reviews several types of diagnostic measurements using beam position monitors which are useful in improving accelerator operations.
	Poster MOPD68 [0.398 MB]

MOPD80	An FPGA-based Bunch-by-Bunch Position and Angle Feedback System at ATF2	feedback, kicker, extraction, linear-collider	233
	G.B. Christian, R. Apsimon, D.R. Bett, B. Constance, M.R. Davis JAI, Oxford, United Kingdom P. Burrows, C. Perry Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Gerbershagen CERN, Geneva, Switzerland J. Resta-López IFIC, Valencia, Spain
	The FONT5 intra-train feedback system serves as a prototype for an interaction point beam-based feedback system for future electron-positron colliders, such as the International Linear Collider. The system has been tested on the KEK Accelerator Test Facility (ATF) and is deployed to stabilise the beam orbit at the ATF2. The goal of this system is to correct both position and angle jitter in the vertical plane, providing stability of ~1 micron at the entrance to the ATF2 final-focus system. The system comprises three stripline beam position monitors (BPMs) and two stripline kickers, custom low-latency analogue front-end BPM processors, a custom FPGA-based digital processing board with fast ADCs, and custom kicker-drive amplifiers. An overview of the hardware, and the latest results from beam tests at ATF2, will be presented. The total latency of the system with coupled position and angle feedback loops operating simultaneously was measured to be approximately 140 ns. The greatest degree of correction observed was down to a jitter of 0.4 microns at one of the feedback BPMs, a factor of six compared to the uncorrected beam jitter, for a very high degree of bunch-to-bunch correlation.

TUPD44	LHC Beam Loss Monitoring System Verification Applications	controls, monitoring, feedback, survey	404
	E. Fadakis, B. Dehning, S. Jackson, C. Zamantzas CERN, Geneva, Switzerland
	The LHC Beam Loss Monitoring (BLM) system is one of the most complex instrumentation systems deployed in the LHC. In addition to protecting the collider, the system also needs to provide a means of diagnosing machine faults and deliver a feedback of losses to the control room as well as to several systems for their setup and analysis. It has to transmit and process signals from almost 4’000 monitors, and has nearly 3 million configurable parameters. The system was designed with reliability and availability in mind. The specified operation and the fail-safety standards must be guaranteed for the system to perform its function in preventing superconductive magnet destruction caused by particle flux. Maintaining the expected reliability requires extensive testing and verification. In this paper we report our most recent additions to the numerous verification applications. The developments have been made using LabVIEW and CERN custom made libraries and allow the user to connect either directly to the front end computer (FEC) or through a dedicated server.

TUPD93	Diagnostics of RF Breakdowns in High-Gradient Accelerating Structures	plasma, electron, vacuum, linear-collider	527
	A. Palaia Uppsala University, Uppsala, Sweden V.A. Dolgashev, J.R. Lewandowski, S.P. Weathersby SLAC, Menlo Park, California, USA
	Within the framework of the research on high-gradient accelerating structures for future linear colliders, diagnostics of radio-frequency (RF) breakdowns is of great importance to support the understanding of the vacuum breakdown process. Measurements of RF and electron and ion currents emitted during and after a breakdown can be used to calculate the properties of any objects responsible for such power reflection and charge emission. Possible breakdown models, breakdown localization and a time-scale of the process are here discussed and compared to dedicated measurements. First results are presented.
	Poster TUPD93 [7.029 MB]

Paper

Title

Other Keywords

Page

MOPD40

Beam Measurements with Visible Synchrotron Light at VEPP-2000 Collider

controls, diagnostics, electron, positron

140

Yu. A. Rogovsky, D.E. Berkaev, I. Koop, A.N. Kyrpotin, I. Nesterenko, A.L. Romanov, Y.M. Shatunov, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia

This paper describes beam diagnostics at VEPP-2000 collider, based on visible synchrotron light analysis. These beam instruments include: SR beamline and optics; acquisition tools and high resolution CCD cameras distributed around the storage ring to measure the transverse beam profile and its position in vacuum chamber; photomultiplier tubes (PMT) which enables beam current measurements. Some applications of these measurement systems and their measurement results are presented.

Poster MOPD40 [0.599 MB]

MOPD44

Self Testing Functionality of the LHC BLM System

high-voltage, monitoring, injection, diagnostics

152

J. Emery, B. Dehning, E. Effinger, A. Nordt, C. Zamantzas
CERN, Geneva, Switzerland

Reliability concerns have driven the design of the LHC BLM system throughout its development, from the early conceptual stage right through the commissioning phase and up to the latest development of diagnostic tools. To protect the system against non-conformities, new ways of automatic checking have been developed and implemented. These checks are regularly and systematically executed by the LHC operation team to insure that the system status after each test is "as good as new". This checks the electrical part of the detectors (ionisation chamber or secondary emission monitor), their cable connections to the front-end electronics, the connections to the back-end electronics and their ability to request a beam abort. During the installation and in the early commissioning phase, these checks proved invaluable in finding non-conformities caused by unexpected failures. This paper will describe these checks in detail, commenting on the latest performance and the typical non-conformities detected. A statistical analysis of the LHC BLM system will also be presented to show the evolution of the various system parameters.

Poster MOPD44 [2.068 MB]

MOPD68

Pickup Beam Measurement System at the VEPP-2000 Collider

betatron, injection, controls, positron

203

Yu. A. Rogovsky, E.A. Bekhtenev
BINP SB RAS, Novosibirsk, Russia

This paper reviews the present state of electromagnetic beam position monitors (pickups) at VEPP-2000 collider. It includes descriptions of position monitors, typical interfaces for these monitors and their system characteristics (resolution, stability, bandwidth and problems or limitations) are discussed. The paper also reviews several types of diagnostic measurements using beam position monitors which are useful in improving accelerator operations.

Poster MOPD68 [0.398 MB]

MOPD80

An FPGA-based Bunch-by-Bunch Position and Angle Feedback System at ATF2

feedback, kicker, extraction, linear-collider

233

G.B. Christian, R. Apsimon, D.R. Bett, B. Constance, M.R. Davis
JAI, Oxford, United Kingdom
P. Burrows, C. Perry
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Gerbershagen
CERN, Geneva, Switzerland
J. Resta-López
IFIC, Valencia, Spain

The FONT5 intra-train feedback system serves as a prototype for an interaction point beam-based feedback system for future electron-positron colliders, such as the International Linear Collider. The system has been tested on the KEK Accelerator Test Facility (ATF) and is deployed to stabilise the beam orbit at the ATF2. The goal of this system is to correct both position and angle jitter in the vertical plane, providing stability of ~1 micron at the entrance to the ATF2 final-focus system. The system comprises three stripline beam position monitors (BPMs) and two stripline kickers, custom low-latency analogue front-end BPM processors, a custom FPGA-based digital processing board with fast ADCs, and custom kicker-drive amplifiers. An overview of the hardware, and the latest results from beam tests at ATF2, will be presented. The total latency of the system with coupled position and angle feedback loops operating simultaneously was measured to be approximately 140 ns. The greatest degree of correction observed was down to a jitter of 0.4 microns at one of the feedback BPMs, a factor of six compared to the uncorrected beam jitter, for a very high degree of bunch-to-bunch correlation.

TUPD44

LHC Beam Loss Monitoring System Verification Applications

controls, monitoring, feedback, survey

404

E. Fadakis, B. Dehning, S. Jackson, C. Zamantzas
CERN, Geneva, Switzerland

The LHC Beam Loss Monitoring (BLM) system is one of the most complex instrumentation systems deployed in the LHC. In addition to protecting the collider, the system also needs to provide a means of diagnosing machine faults and deliver a feedback of losses to the control room as well as to several systems for their setup and analysis. It has to transmit and process signals from almost 4’000 monitors, and has nearly 3 million configurable parameters. The system was designed with reliability and availability in mind. The specified operation and the fail-safety standards must be guaranteed for the system to perform its function in preventing superconductive magnet destruction caused by particle flux. Maintaining the expected reliability requires extensive testing and verification. In this paper we report our most recent additions to the numerous verification applications. The developments have been made using LabVIEW and CERN custom made libraries and allow the user to connect either directly to the front end computer (FEC) or through a dedicated server.

TUPD93

Diagnostics of RF Breakdowns in High-Gradient Accelerating Structures

plasma, electron, vacuum, linear-collider

527

A. Palaia
Uppsala University, Uppsala, Sweden
V.A. Dolgashev, J.R. Lewandowski, S.P. Weathersby
SLAC, Menlo Park, California, USA

Within the framework of the research on high-gradient accelerating structures for future linear colliders, diagnostics of radio-frequency (RF) breakdowns is of great importance to support the understanding of the vacuum breakdown process. Measurements of RF and electron and ion currents emitted during and after a breakdown can be used to calculate the properties of any objects responsible for such power reflection and charge emission. Possible breakdown models, breakdown localization and a time-scale of the process are here discussed and compared to dedicated measurements. First results are presented.

Poster TUPD93 [7.029 MB]