C. Deibele

Oak Ridge National Laboratory, US Iter, Faculty Member

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Lafifa Jamal

University of Dhaka, Bangladesh

Mitchell Thornton

Southern Methodist University

A N K Zaman

Rajshahi University

Tshilidzi Marwala

University of Johannesburg, South Africa

Didier Maquin

University of Lorraine

Walid Najjar

University of California, Riverside

spyros G tzafestas

National Technical University of Athens

Lyudmila S Mihaylova

The University of Sheffield

Chatchanok Udomtanakunchai

Chiang Mai University

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NTUA

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Papers by C. Deibele

Final Design Report Proton Power Upgrade Project

Status of the ITER Ion Cyclotron H

EPJ Web of Conferences

The ITER Ion Cyclotron Heating and Current Drive system (IC H&CD) is designed to deliver 20MW to ... more The ITER Ion Cyclotron Heating and Current Drive system (IC H&CD) is designed to deliver 20MW to a broad range of plasma scenarios between 40 and 55MHz, during very long pulses. It consists of two broadband equatorial port plug antennas, their pre-matching and matching systems, transmission lines, Radio Frequency (RF) Sources and High Voltage Power Supplies. The overall project schedule has been revised and agreed by ITER Council; it re-integrates the second antenna and its power supplies in construction baseline and sets the dates for progressive installation with DT phase planned in 2035. Recent progress on ICRF subsystems is reported, covering design evolution, qualification of test articles and specific R&D results in domestic agencies, suppliers, associated laboratories and IO.

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Methods for matching to the ITER Ion Cyclotron Heating antenna

2015 IEEE 26th Symposium on Fusion Engineering (SOFE), 2015

SNS Ring and RTBT Beam Current Monitor

AIP Conference Proceedings, 2006

The Spallation Neutron Source Beam Commissioning and Initial Operations

High Speed High Dynamic Range High Accuracy Measurement System

Broadband high impedance pickoff circuit

Fast faraday cup with high bandwidth

Installation of the Spallation Neutron Source (SNS) Superconducting Linac

Proceedings of the 2005 Particle Accelerator Conference, 2000

The Spallation Neutron Source (SNS) superconducting linac (SCL) consists of 11 medium beta (0.61)... more The Spallation Neutron Source (SNS) superconducting linac (SCL) consists of 11 medium beta (0.61) and 12 high beta (0.81) superconducting RF cryomodules, 32 intersegment quadrupole magnet/diagnostics stations, 9 spool beampipes for future upgrade cryomodules, and two differential pumping stations on either end of the SCL. The cryomodules and spool beampipes were designed and manufactured by Jefferson Laboratory, and the quadrupole magnets and beam position monitors were designed and furnished by Los Alamos National Laboratory. Remaining items were designed by Oak Ridge National Laboratory. At present the SCL is being installed and tested. This paper discusses the experience gained during installation and the performance in terms of mechanical and cryogenic systems.

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Transverse beam stability measurement and analysis for the SNS accumulator ring

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2015

Engineering, design and prototype tests of a 3.9 GHz transverse-mode superconducting cavity for a radiofrequency-separated Kaon beam

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268), 2001

A research and development program is underway to construct superconducting cavities to be used f... more A research and development program is underway to construct superconducting cavities to be used for radiofrequency separation of a Kaon beam at Fermilab. The design calls for installation of twelve 13-cell cavities operating in the 3.9 GHz transverse mode with a deflection gradient of 5 MV/m. We present the mechanical, cryogenic and vacuum design of the cavity, cryomodule, rf power coupler, cold tuner and supporting hardware. The electromagnetic design of the cavity is presented in a companion paper by Wanzenberg and McAshan [1]. The warm tuning system (for field flatness) and the vertical test system will be presented along with test results of bench measurements and cold tests on single-cell and five-cell prototypes.

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Accumulation of High Intensity Beam and First Observations of Instabilities in the SNS Accumulator Ring

The Spallation Neutron Source storage ring, designed to accumulate up to 1.5e14 protons per pulse... more The Spallation Neutron Source storage ring, designed to accumulate up to 1.5e14 protons per pulse, was commissioned in January of 2006. During the run, over 1.e14 protons were accumulated in the ring in the natural chromaticity state without any sign of instabilities. The first beam instabilities were observed for a high intensity coasting beam with zero chromaticity. Preliminary analysis of data indicates instabilities related to extraction kicker impedances, resistive wall impedances, and electron-proton instability. Here we review the background theory and design philosophy of the ring, as it relates to instabilities, and compare the precommissioning predictions with the experimental measurements.

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Low-power RF tuning of the Spallation Neutron Source warm LINAC structures

The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Rid... more The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. A conventional 402.5-MHz drift-tube linac (DTL) accelerates the H beam from 2.5 to 86 MeV, followed by a 805-MHz coupled-cavity linac (CCL) to 186 MeV. Tuning the six DTL tanks involves adjusting post-coupler lengths and slug tuners to achieve the design resonant frequency

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Technical Design Report, Second Target Station

SRF Cavity Transient Beam Loading Detection Simulation and Measurement

Design of an ionization profile monitor for the SNS accumulator ring

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014

ABSTRACT An ionization profile monitor (IPM) has been designed for the Spallation Neutron Source ... more ABSTRACT An ionization profile monitor (IPM) has been designed for the Spallation Neutron Source (SNS) accumulator ring with the goal of simplifying current IPM technology to provide accurate high-intensity beam profiles. Utilizing ionized electrons produced by beam-gas ionization, the SNS IPM uses a 120 kV bias potential and uniquely designed electrode to overcome beam space charge and accelerate electrons towards a movable particle detector. A 300 G magnetic field will be used to confine the transverse electron motion, resulting in profile errors at the 7% level. With a system bandwidth of 17.5 MHz, the SNS IPM will be capable of measuring turn-by-turn beam profiles for a fully accumulated beam. This paper presents a description of the system and design.

Transient beam-loading detection in an SNS cavity- simulations and initial measurements

2007 IEEE Particle Accelerator Conference (PAC), 2007

Beam phase measurement based on the detection of a transient beam-loading signal in a SC cavity h... more Beam phase measurement based on the detection of a transient beam-loading signal in a SC cavity has the potential to become a very fast linac tune-up technique, especially for an electron linac, as it may precisely set up the cavity's synchronous phase. A large signal-to-noise ratio is critical in the development of a transient detector technique. This paper discusses the study of a transient detector in the Spallation Neutron Source proton linac and the major challenge for this method: stochastic noise in the rf system, which reduces the precision and increases the time needed for accurate phase measurement. Using simulation studies with a beam-cavity model, signal measurement with the Low-Level RF system, and the experiment with prototype detectors, we analyzed the influence of noise on phase measurement.

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Pasta – an RF Phase Scan and Tuning Application

Proceedings of the 2005 Particle Accelerator Conference, 2005

To assist the beam commissioning in the Spallation Neutron Source (SNS) linac, a general purpose ... more To assist the beam commissioning in the Spallation Neutron Source (SNS) linac, a general purpose Radio Frequency (RF) tuning application has been written to help set RF phase and amplitude. The method involves varying an Rf cavity amplitude and phase settings over a fairly large range and comparing the measured downstream beam phase response “signatures” to model predictions. The model

Matching BPM Stripline Electrodes to Cables and Electronics

Proceedings of the 2005 Particle Accelerator Conference, 2005