ICALEPCS2013 - List of Keywords (high-voltage)

Paper	Title	Other Keywords	Page
MOPPC064	A New Spark Detection System for the Electrostatic Septa of the SPS North (Experimental) Area	ion, controls, cathode, septum	246
	R.A. Barlow, B. Balhan, J. Borburgh, E. Carlier, C. Chanavat, T. Fowler, B. Pinget CERN, Geneva, Switzerland
	Electrostatic septa (ZS) are used in the extraction of the particle beams from the CERN SPS to the North Area experimental zone. These septa employ high electric fields, generated from a 300 kV power supply, and are particularly prone to internal sparking around the cathode structure. This sparking degrades the electric field quality, consequently affecting the extracted beam, vacuum and equipment performance. To mitigate these effects, a Spark Detection System (SDS) has been realised, which is based on an industrial SIEMENS S7-400 programmable logic controller and deported Boolean processors modules interfaced through a PROFINET fieldbus. The SDS interlock logic uses a moving average spark rate count to determine if the ZS performance is acceptable. Below a certain spark rate it is probable that the ZS septa tank vacuum can recover, thus avoiding transition into a state where rapid degradation would occur. Above this level an interlock is raised and the high voltage is switched off. Additionally, all spark signals acquired by the SDS are sent to a front-end computer to allow further analysis such as calculation of spark rates and production of statistical data.
	Poster MOPPC064 [0.366 MB]

TUCOCA09	Klystron Measurement and Protection System for XFEL on the MTCA.4 Architecture	klystron, LLRF, vacuum, FPGA	937
	Ł. Butkowski, H. Schlarb, V. Vogel DESY, Hamburg, Germany
	The European XFEL free-electron laser is under construction at the DESY. The driving engine of the superconducting accelerator will be 27 RF station. Each of an underground RF station consist from multi beam horizontal klystron which can provide up to 10MW of power at 1.3GHz. The XFEL should work continuously over 20 years with only 1 day per month for maintenance. In order to meet so demanding requirement lifetime of the MBK should be as long as possible. In the real operation the lifetime of tube can be thoroughly reduced by service conditions. To minimize the influence of service conditions to the klystrons lifetime the special fast protection system named as Klystron Lifetime Management System (KLM) has been developed, the main task of this system is to detect all events which can destroy the tube as quickly as possible, and then stop input power to the tube and send signal to stop HV pulse. The tube recovery procedure should depend on the kind of events has happened. KLM is based on the standard LLRF uTCA system for XFEL with additional DC channels. This article gives an overview of implementation of measurement and protection system installed at klystron test stand.
	Slides TUCOCA09 [0.496 MB]

THCOCA05	Laser MegaJoule Timing System	laser, timing, target, diagnostics	1457
	J.I. Nicoloso CEA/DAM/DIF, Arpajon, France J.P.A. Arnoul, J.J. Dupas, P. Raybaut CEA, LE BARP cedex, France
	The French Commissariat à l’Énergie Atomique et aux Énergies alternatives (CEA) is currently building the Laser Megajoule (LMJ). This facility is designed to deliver laser energy to targets for high energy density physics experiments, including fusion experiments. The Integrated Timing and Triggering System (ITTS) is one of the critical LMJ components, in charge of timing distribution for synchronizing the laser beams and triggering the shot data acquisitions. The LMJ ITTS Control System provides a single generic interface to its users at the Supervisory level, built around the key concept of “Synchronized Channels Group”, a set of delay channels triggered simultaneously. Software common components provide basic mechanisms: communication with its users, channel registration User-defined delays are specified with respect to a given reference(target chamber center, quadruplet or beam reference times), these delays are then translated into hardware delays according to different parameters such as electronic cards temperatures(for thermal drift correction) and transit delays. Equipments are mainly off-the-shelf timing equipments delivering trigger signals with jitter down to 15ps rms.
	Slides THCOCA05 [0.974 MB]

Paper

Title

Other Keywords

Page

MOPPC064

A New Spark Detection System for the Electrostatic Septa of the SPS North (Experimental) Area

ion, controls, cathode, septum

246

R.A. Barlow, B. Balhan, J. Borburgh, E. Carlier, C. Chanavat, T. Fowler, B. Pinget
CERN, Geneva, Switzerland

Electrostatic septa (ZS) are used in the extraction of the particle beams from the CERN SPS to the North Area experimental zone. These septa employ high electric fields, generated from a 300 kV power supply, and are particularly prone to internal sparking around the cathode structure. This sparking degrades the electric field quality, consequently affecting the extracted beam, vacuum and equipment performance. To mitigate these effects, a Spark Detection System (SDS) has been realised, which is based on an industrial SIEMENS S7-400 programmable logic controller and deported Boolean processors modules interfaced through a PROFINET fieldbus. The SDS interlock logic uses a moving average spark rate count to determine if the ZS performance is acceptable. Below a certain spark rate it is probable that the ZS septa tank vacuum can recover, thus avoiding transition into a state where rapid degradation would occur. Above this level an interlock is raised and the high voltage is switched off. Additionally, all spark signals acquired by the SDS are sent to a front-end computer to allow further analysis such as calculation of spark rates and production of statistical data.

Poster MOPPC064 [0.366 MB]

TUCOCA09

Klystron Measurement and Protection System for XFEL on the MTCA.4 Architecture

klystron, LLRF, vacuum, FPGA

937

Ł. Butkowski, H. Schlarb, V. Vogel
DESY, Hamburg, Germany

The European XFEL free-electron laser is under construction at the DESY. The driving engine of the superconducting accelerator will be 27 RF station. Each of an underground RF station consist from multi beam horizontal klystron which can provide up to 10MW of power at 1.3GHz. The XFEL should work continuously over 20 years with only 1 day per month for maintenance. In order to meet so demanding requirement lifetime of the MBK should be as long as possible. In the real operation the lifetime of tube can be thoroughly reduced by service conditions. To minimize the influence of service conditions to the klystrons lifetime the special fast protection system named as Klystron Lifetime Management System (KLM) has been developed, the main task of this system is to detect all events which can destroy the tube as quickly as possible, and then stop input power to the tube and send signal to stop HV pulse. The tube recovery procedure should depend on the kind of events has happened. KLM is based on the standard LLRF uTCA system for XFEL with additional DC channels. This article gives an overview of implementation of measurement and protection system installed at klystron test stand.

Slides TUCOCA09 [0.496 MB]

THCOCA05

Laser MegaJoule Timing System

laser, timing, target, diagnostics

1457

J.I. Nicoloso
CEA/DAM/DIF, Arpajon, France
J.P.A. Arnoul, J.J. Dupas, P. Raybaut
CEA, LE BARP cedex, France

The French Commissariat à l’Énergie Atomique et aux Énergies alternatives (CEA) is currently building the Laser Megajoule (LMJ). This facility is designed to deliver laser energy to targets for high energy density physics experiments, including fusion experiments. The Integrated Timing and Triggering System (ITTS) is one of the critical LMJ components, in charge of timing distribution for synchronizing the laser beams and triggering the shot data acquisitions. The LMJ ITTS Control System provides a single generic interface to its users at the Supervisory level, built around the key concept of “Synchronized Channels Group”, a set of delay channels triggered simultaneously. Software common components provide basic mechanisms: communication with its users, channel registration User-defined delays are specified with respect to a given reference(target chamber center, quadruplet or beam reference times), these delays are then translated into hardware delays according to different parameters such as electronic cards temperatures(for thermal drift correction) and transit delays. Equipments are mainly off-the-shelf timing equipments delivering trigger signals with jitter down to 15ps rms.

Slides THCOCA05 [0.974 MB]