IBIC2013 - List of Keywords (ion)

Paper	Title	Other Keywords	Page
MOBL2	Thermalized and Reaccelerated Beams at the National Superconducting Cyclotron Laboratory	acceleration, diagnostics, cyclotron, injection	19
	S.J. Williams, T. Baumann, K. Cooper, A. Lapierre, D. Leitner, D.J. Morrissey, G. Perdikakis, J.A. Rodriguez, S. Schwarz, A. Spyrou, M. Steiner, C. Sumithrarachchi NSCL, East Lansing, Michigan, USA W. Wittmer FRIB, East Lansing, Michigan, USA
	Funding: This work is supported by the National Science Foundation under contract number RC100609. The National Superconducting Cyclotron Laboratory at Michigan State University is a Radioactive Ion Beam (RIB) facility providing beams of exotic nuclear species through projectile fragmentation. The Coupled Cyclotron Facility accelerates stable ion beams to ~100 MeV/A which are then fragmented and selected with the A1900 separator. A recent addition to NSCL is the gas stopping facility which thermalizes the high energy beam. The RIBs are extracted at <60keV and selected by A/Q for further transport to the low energy areas, currently consisting of the BECOLA beam cooling and laser spectroscopy system, and LEBIT Penning trap. RIBs up to 6 MeV/A will be provided by the ReA post-accelerator, currently consisting of an EBIT, RFQ and superconducting RF cavities. Energies up to 1.5 MeV/A are presently available, and energy increases will be phased in with the addition of further cryomodules. In a campaign of commissioning experiments, RIBs from a fragmentation facility were thermalized and post-accelerated for the first time. Preliminary results will be presented, focussing on the diagnostic challenges of detecting and characterizing beams over a wide range of energy and rate.
	Slides MOBL2 [2.084 MB]

MOPC46	Beam Loss Monitor System for Low-Energy Heavy-Ion FRIB Accelerators	radiation, beam-losses, background, heavy-ion	186
	Z. Liu, T. Russo, R.C. Webber, Y. Yamazaki, Y. Zhang FRIB, East Lansing, Michigan, USA
	Funding: Work is supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 Radiation transport simulations reveal shortcomings in the use of ion chambers for the detection of beam losses in low-energy, heavy-ion accelerators like FRIB. Radiation cross-talk effects due to the specific FRIB paper-clip geometry complicate locating specific points of beam loss. We describe an economical and robust solution that complements ionization chambers. A specifically designed device, the halo monitor ring (HMR), is implemented upstream of each cryomodule to detect beam loss directly. Together with fast response neutron scintillators, the new integrated BLM system satisfies both machine protection and sensitivity requirements.
	Poster MOPC46 [1.014 MB]

MOPF09	A Gas-Jet Profile Monitor for the CLIC Drive Beam	electron, CLIC, space-charge, focusing	224
	A. Jeff, E.B. Holzer, T. Lefèvre CERN, Geneva, Switzerland A. Jeff, V. Tzoganis, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom V. Tzoganis, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	The Compact LInear Collider (CLIC) will use a novel acceleration scheme in which energy extracted from a very intense beam of relatively low-energy electrons (the Drive Beam) is used to accelerate a lower intensity Main Beam to very high energy. The high intensity of the Drive Beam, with pulses of more than 10¹⁵ electrons, poses a challenge for conventional profile measurements such as wire scanners. Thus, new non-invasive profile measurements are being investigated. Profile monitors using gas ionisation or fluorescence have been used at a number of accelerators. Typically, extra gas must be injected at the monitor and the rise in pressure spreads some distance down the beampipe. In contrast, a gas jet can be fired across the beam into a receiving chamber, with little gas escaping into the rest of the beam pipe. In addition, a gas jet shaped into a thin plane can be used like a screen on which the beam cross-section is imaged. In this paper we present some arrangements for the generation of such a jet. In addition to jet shaping using nozzles and skimmers, we propose a new scheme to use matter-wave interference with a Fresnel Zone Plate to bring an atomic jet to a narrow focus.

MOPF13	Transverse Beam Profiling for FAIR	IPM, GSI, OTR, UNILAC	232
	M. Schwickert, C.A. Andre, F. Becker, P. Forck, T. Giacomini, E. Gütlich, T. Hoffmann, A. Lieberwirth, S. Löchner, A. Reiter, B. Voss, B. Walasek-Höhne, M. Witthaus GSI, Darmstadt, Germany
	The FAIR facility will provide intense primary beams of protons and heavy ions, or secondary beams of antiproton and rare isotopes. The operation includes fixed-target experiments or subsequent facilities of independent storage rings and experiment beam lines. The particle beams greatly differ in ion species, intensity, time structure, spot size and stopping power. Therefore, transverse beam profile measurements require a careful choice of detector type for each location in order to cope with the large dynamic range and operational demands. This contribution presents the actual status of FAIR detector developments for intercepting devices (SEM-Grids, Multi-Wire Proportional Chambers, Scintillating Screens) as well as non-intercepting Beam Induced Fluorescence Monitors and Ionization Profile Monitors. Recently, promising results were obtained with slow extracted heavy ion beams in measurements of optical transmission radiation emitted from thin metal foils. The boundaries for the application area are described and basic detector parameters are summarized.

MOPF14	Scintillation Screen Response to Heavy Ion Impact	GSI, UNILAC, radiation, transverse	235
	E. Gütlich, O.K. Kester IAP, Frankfurt am Main, Germany P. Forck, O.K. Kester GSI, Darmstadt, Germany
	For quantitative transverse ion beam profile measurement, imaging properties of scintillation screens have been investigated for the working conditions of the GSI linear accelerator. In the ion energy range between 4.8 and 11.4 MeV/u the imaging properties of the screens are compared with profiles obtained using standard techniques like SEM grids and scraper. Detailed investigations with e.g. Calcium and Argon ion beams on various radiation-hard materials show that the measured beam profiles can differ from those measured with standard methods and depend on several beam and material parameters . For the practical usage of scintillators, it is necessary to have predictions for the response of the scintillator to a given ion beam. An existing model for the light output of scintillators for single particle irradiation has been extended to include the effect of overlapping excitation tracks. To validate the model, dedicated measurements with well-defined Carbon and Titanium ion beams at 11.4 MeV/u have been carried out. To understand the mechanisms, the beam flux and the pulse length has been varied. The measured light yield is compared to the model calculations. E. Gütlich et al., “Scintillation screen studies for high dose ion beam applications”, IEEE Transactions on Nuclear Science, Vol. 59, No. 5, October 2012, pp. 2354 – 2359.
	Poster MOPF14 [0.818 MB]

MOPF31	Design and Performance of the Biased Drift Tube System in the BNL Electron Lens	RHIC, electron, beam-losses, vacuum	291
	T.A. Miller, W. Fischer, D.M. Gassner, X. Gu, A.I. Pikin, S. Polizzo, P. Thieberger BNL, Upton, Long Island, New York, USA J. Barth Barth Electronics, Boulder City, USA
	Funding: Work supported by U.S. DOE under contract No DE-AC02-98CH10886 with the U.S. Department of Energy. The installation of the Electron Lenses in RHIC will be completed this year. Its design includes a series of drift tubes through which the electron beam copropagates, with the RHIC proton beams. These drift tubes are used to create an electric field gradient to sweep out ions that become trapped within the central magnetic field where the electron beam interacts with the proton beams. These isolated drift tubes are biased by high voltage power supplies. Without a path for the proton beam image currents, high voltages will develop on the drift tubes that can be detrimental to the electron beam and increase the RHIC machine impedance. This paper presents the design of the drift tubes, axial electric field gradient, and the custom high voltage RF bias tees that were designed to provide separate paths for the high frequency image currents and the DC high voltage bias over the same cables. The design and simulation of the bias tee is discussed, as well as RF signals from the proton beam current imaged on the drift tubes, as measured through the bias tees during the commissioning of the blue RHIC beam electron lens this past spring.
	Poster MOPF31 [31.237 MB]

TUCL3	Gas Electron Multipliers Versus Multi Wire Proportional Chambers	CERN, electron, antiproton, transverse	342
	S.C. Duarte Pinto Delft University of Technology, Opto-electronic Section, Delft, The Netherlands J. Spanggaard CERN, Geneva, Switzerland
	Gas Electron Multiplication technology is finding more and more applications in beam instrumentation and at CERN these detectors have recently been adapted for use in transverse profile measurements at several of our facilities. In the experimental areas of CERN’s Antiproton Decelerator, low energy Gas Electron Multipliers successfully replaced all Multi-Wire Proportional Chambers in 2012 and another detector type has now been developed for high energy applications in the experimental areas of the SPS, totalling a potential of more than a hundred profile detectors to be replaced by GEM detectors of different types. This paper aims to describe the historical evolution of GEM technology by covering the many different applications but with specific focus on its potential to replace Multi-Wire Proportional Chambers for standard transverse profile measurement.
	Slides TUCL3 [3.275 MB]

TUPC01	Overview of the European Spallation Source Warm Linac Beam Instrumentation	linac, ESS, diagnostics, emittance	346
	B. Cheymol, C. Böhme, I. Dolenc Kittelmann, H. Hassanzadegan, A. Jansson, T.J. Shea, L. Tchelidze ESS, Lund, Sweden
	The normal conducting front end of the European Spallation source will accelerate the beam coming for the ion source up to 90 MeV. The ESS front end will consist in an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line and a drift tube linac. The warm linac will be equipped with beam diagnostics to measure the beam position, the transverse and longitudinal profile as well as beam current and beam losses. This will provide efficient operation of ESS, and ensure keeping the losses at a low level. This paper gives an overview of the beam diagnostics design and their main features.

TUPC46	Beam Loss Monitoring Study for SIS100@FAIR	beam-losses, simulation, GSI, SIS	485
	V.S. Lavrik, L.H.J. Bozyk, O.K. Kester, A. Reiter GSI, Darmstadt, Germany O.K. Kester, V.S. Lavrik IAP, Frankfurt am Main, Germany
	FAIR, the facility for antiproton and ion research, is a multi-disciplinary accelerator facility which will extend the existing GSI complex in Darmstadt, Germany. In the FAIR start version, the new synchrotron SIS100 will provide proton or heavy ion beams for a variety of experiments. The GSI synchrotron SIS18 will operate as injector for SIS100. The current study focuses on beam loss measurements for SIS18 and SIS100. The aim of this study is to find quantitative methods to measure beam losses around the machine, mainly SIS100, on an absolute scale. The contribution will present results of two pilot experiments carried out in the high-energy beam lines and at the SIS18 with Uranium ions in the energy range up to 900 MeV/u. In the first experiment the Uranium beam was totally stopped in a Copper target and the particle shower measured with LHC-type ionization chambers. In the second experiment, the beam was slowly excited in the SIS18 synchrotron to create controlled losses on a scraper which were monitored by the DC current transformer and beam loss monitors. Experimental data are compared against the predictions of Fluka simulations.
	Poster TUPC46 [5.404 MB]

TUPF02	Secondary Emission Monitor for keV Ion and Antiproton Beams	MCP, antiproton, electron, CERN	495
	A.G. Sosa, E. Bravin, A. Jeff CERN, Geneva, Switzerland J. Harasimowicz, A. Jeff, A.G. Sosa, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom J. Harasimowicz, A. Jeff, A.G. Sosa, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: Work supported by the EU within the DITANET and CATHI projects under contracts 215080 and 264330, HGF and GSI under contract VH-NG-328 and STFC under the Cockcroft Institute core grant ST/G008248/1. Beam profile monitoring of low intensity keV ion and antiproton beams remains a challenging task. A Secondary electron Emission Monitor (SEM) has been designed to measure profiles of beams with intensities below 10⁷ and energies as low as 20 keV. The monitor is based on a two stage microchannel plate (MCP) and a phosphor screen facing a CCD camera. Its modular design allows two different operational setups. In this contribution we present the design of a prototype and discuss results from measurements with protons at INFN-LNF and antiprotons at the AEgIS experiment at CERN. This is then used for a characterization of the monitor with regard to its possible future use at different facilities. Measurements at the AD carried out with the AEgIS collaboration.
	Poster TUPF02 [1.934 MB]

TUPF06	2D Wire Grid Integrated with Faraday Cup for Low Energy H⁻ Beam Analysis at Siemens Novel Electrostatic Accelerator	ion-source, electron, simulation, plasma	507
	H. von Jagwitz-Biegnitz JAI, Oxford, United Kingdom P. Beasley, O. Heid Siemens AG, Erlangen, Germany D.C. Faircloth STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom A.J. Holmes Marcham Scientific Ltd, Hungerford, United Kingdom R.G. Selway Inspired Engineering Ltd, Climping, United Kingdom
	A wire grid with 21 wires each vertically and horizontally with a spacing of 1 mm has been developed for beam analysis at Siemens' novel electrostatic accelerator. The wire grid is integrated in a Faraday Cup and profile measurements can therefore be combined with current measurements. The grid is used to analyse the 10 keV H⁻ beam coming from the ion source and the obtained beam parameters will be used as input for simulations of the beam transport in the accelerator. All 42 wires can be read out simultaneously with a multi-channel precision electrometer and the data can be fitted instantly with LabVIEW code that was developed for this purpose. This paper reports on some details of the mechanical design and the data analysis procedure in LabVIEW as well as some results of first measurements at the novel accelerator.

TUPF10	A Non-Intercepting Beam Emittance Measurement Device Based on Neutral Beam Fluorescence Method at PKU	emittance, ion-source, transverse, dipole	522
	S.X. Peng, J. Chen, Z.Y. Guo, H.T. Ren, Y. Xu, J. Zhao PKU, Beijing, People's Republic of China J.E. Chen, A.L. Zhang Graduate University, Chinese Academy of Sciences, Beijing, People's Republic of China L.T. Sun, H.W. Zhao IMP, Lanzhou, People's Republic of China
	A new concept to attain ion beam emmitance through measuring the forward neutral beam without intercepting the beam transportion was proposed at PKU. The forward neutral beam produced by space charge compensation and separated from the transporting ion beam with the help of a deflecting magnetic field, carries the entire emittance information of the original particle beam and becomes a fast and non-interceptive beam diagnostic tool. This idea was tested on PKU ion source test bench and the experimental results show that the neutral beam fluorescence method is feasible. Bases on these qualification results, a formal non-intercepting emittance measurement device was designed. It is a 90 degree full-scale dipole analysis magnet combining with the classical pepper-pot technique. Test and commissioning of the device are in progress. Details of design and comnissioning results will be presented in this paper.

TUPF15	Overview of Laserwire Beam Profile and Emittance Measurements for High Power Proton Accelerators	laser, linac, emittance, CERN	531
	S.M. Gibson, G.E. Boorman, A. Bosco Royal Holloway, University of London, Surrey, United Kingdom G.E. Boorman, A. Bosco, S.M. Gibson JAI, Egham, Surrey, United Kingdom C. Gabor STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom T. Hofmann CERN, Geneva, Switzerland A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J.K. Pozimski STFC/RAL, Chilton, Didcot, Oxon, United Kingdom J.K. Pozimski, P. Savage Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Laserwires were originally developed to measure micron-sized electron beams via Compton scattering, where traditional wire scanners are at the limit of their resolution. Laserwires have since been applied to larger beam-size, high power H⁻ ion beams, where the non-invasive method can probe beam densities that would damage traditional diagnostics. While photo-detachment of H⁻ ions is now routine to measure beam profiles, extending the technique to transverse and longitudinal emittance measurements is a key aim of the laserwire emittance scanner under construction at the Front End Test Stand (FETS) at the RAL. A pulsed, 30kHz, 8kW peak power laser is fibre-coupled to motorized collimating optics, which controls the position and thickness of the laserwire delivered to the H⁻ interaction chamber. The laserwire slices out a beamlet of neutralized particles, which propagate to a downstream scintillator and camera. The emittance is reconstructed from 2D images as the laserwire position is scanned. Results from the delivery optics, scintillator tests and particle tracking simulations of the full system are reviewed. Plans to deploy the FETS laser system at the Linac4 at CERN are outlined.
	Poster TUPF15 [9.196 MB]

TUPF16	Analysis of Measurement Errors of INR Linac Ionization Beam Cross Section Monitor	linac, space-charge, proton, simulation	535
	S.A. Gavrilov, A. Feschenko, P.I. Reinhardt-Nickoulin, I.V. Vasilyev RAS/INR, Moscow, Russia A. Feschenko, S.A. Gavrilov MIPT, Dolgoprudniy, Moscow Region, Russia
	Residual gas ionization beam cross section monitors (BCSM) are installed at LEBT and HEBT of INR RAS proton linac to measure cross section, profiles and position of the beam. BCSMs provide two-dimensional non-destructive real-time beam diagnostics at LINAC operation with repetition frequency from 1 to 50 Hz, pulses duration from 0.3 to 170 μs and wide range of amplitudes, particle energy 400 keV and 209 MeV. The analysis of systematic measurements errors (accuracy) because of nonuniform electrostatic fields, determined by BCSM design features, is presented. New detector model, minimizing these nonuniformities, is shown. Besides that, the analysis of statistical errors (precision) due to the method features, in particular, ions thermal motion and a beam space charge, is done. The simulation results make it possible to estimate measured cross sections size, profiles and beam positions and to draw conclusions about the reliability of BCSM results for beams with various parameters.

TUPF21	Response of Scintillating Screens to Fast and Slow Extracted Ion Beams	extraction, target, GSI, radiation	553
	A. Lieberwirth, W. Ensinger TU Darmstadt, Darmstadt, Germany P. Forck, B. Walasek-Höhne GSI, Darmstadt, Germany
	Funding: Funded by German Ministry of Science (BMBF), contract number 05P12RDRBJ For the FAIR project, imaging properties of inorganic scintillators for high energetic heavy ion beams were studied. In order to investigate the characteristics of scintillation response and transverse beam profile, several experiments were conducted with slow (200 ms) and fast (1 μs) extracted 350 MeV/u Uranium beams from SIS18. The extracted particle number was varied between 10⁵ and 10⁹ particles per pulse for the irradiation of seven different scintillators: YAG:Ce-crystals with different qualities, pure and Cr-doped alumina as well as two phosphors P43 and P46. Additionally radiation resistance tests for all phosphor screens and the Cr-doped alumina screen were performed by irradiating with more than 700 pulses with 10⁹ ions each. Linear response in scintillation light output as well as realistic statistical moments over the large range of ion intensities are presented for each material. Only minor changing in target response was observed after 45 minutes of permanent irradiation.
	Poster TUPF21 [2.601 MB]

TUPF24	Instrumentation for the Proposed Low Energy RHIC Electron Cooling Project	electron, RHIC, diagnostics, emittance	561
	D.M. Gassner, A.V. Fedotov, D. Kayran, V. Litvinenko, R.J. Michnoff, T.A. Miller, M.G. Minty, I. Pinayev, M. Wilinski BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy There is a strong interest in running RHIC at low ion beam energies of 2.5-20GeV/nucleon; this is much lower than the typical operations with 100GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. Simulations and conceptual cooling sub-system designs are underway. The present plan is to provide 10–50mA of bunched electron beam with adequate quality and an energy range of 0.9–5MeV. The preliminary cooling facility configuration planned to be fully inside the RHIC tunnel will include a 102.74MHz SRF gun, a booster cavity, a beam transport to the Blue ring to allow electron-ion co-propagation for ~10-20m, then a 180 degree u-turn electron transport so the same electron beam can similarly cool the Yellow ion beam, then to a dump. The electron beam instrumentation systems that will be described include current transformers, BPMs, profile monitors, a pepper pot emittance station and loss monitors.
	Poster TUPF24 [1.588 MB]

WEPC02	Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK	rfq, ion-source, quadrupole, diagnostics	652
	G. Turemen, B. Yasatekin Ankara University, Faculty of Sciences, Ankara, Turkey Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu TAEK, Ankara, Turkey E. Cavlan TOBB ETU, Ankara, Turkey M. Celik, Z. Sali Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey S. Erhan UCLA, Los Angeles, California, USA Ö. Mete UMAN, Manchester, United Kingdom G. Unel UCI, Irvine, California, USA
	The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H⁺ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H⁺ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.
	Poster WEPC02 [25.664 MB]

WEPC04	Beam Diagnostics for Commissioning and Operation of a Novel Compact Cyclotron for Radioisotope Production	diagnostics, cyclotron, ion-source, target	660
	I. Podadera, B. Ahedo, P. Arce, L. García-Tabarés, D. Gavela, A. Guirao, J.I. Lagares, L.M. Martinez, D. Obradors-Campos, C. Oliver, J.M. Perez Morales, F. Sansaloni, F. Toral CIEMAT, Madrid, Spain
	Funding: Work partially funded by the CDTI and supported by the Spanish Ministry of Science and Innovation under project AMIT, within the subprogramme CENIT-2009. The AMIT cyclotron will be a 8.5 MeV, 10 μA CW H⁻ accelerator which aims to deliver a beam for radioisotope production. In order to properly validate all the beam commissioning steps, a set of diagnostics needs to be implemented. They must cover all the commissioning phases: ion source characterization, medium energy acceleration and nominal energy at full current. Due to compactness of the design, the number of beam diagnostics is limited and restricted to the most essential ones during operation. An overview of the diagnostics that are planned for the characterization of the cyclotron will be discussed in this contribution. In all the commissioning phases, beam current probes are essential to validate the cyclotron and each subsystem. As a main diagnostic, a moveable probe has been designed and simulated for optimization of the cyclotron. The thermal simulations of the probe and the mechanical integration will be presented.

WEPC15	Development of the Beam Position Monitors System for the LINAC of SPIRAL2	BPM, linac, SPIRAL2, transverse	702
	P. Ausset, M. Ben Abdillah, J. Lesrel, E. Marius IPN, Orsay, France T. Ananthkrishnan, S.K. Bharade, G. Joshi, P.D. Motiwala, C.K. Pithawa BARC, Trombay, Mumbai, India V. Nanal, R.G. Pillay TIFR, Mumbai, India
	The SPIRAL 2 facility will deliver stable heavy ion and deuteron beams at very high intensity, producing and accelerating light and heavy rare ion beams. The driver will accelerate between 0.15mA and 5 mA deuteron beam up to 20 MeV/u and q/A=1/3 heavy ions up to 14.5 MeV/u. It is being built on the site of the Grand Accelerator National d’Ions Lourds at CAEN (France) The accurate tuning of the LINAC is essential for the operation of SPIRAL2 and requires from the Beam Position Monitor (BPM) system the measurements of the beam transverse position, the phase of the beam with respect to the radiofrequency voltage and the beam energy. This paper addresses the advancement made during the last twelve months on the realization of the 22 BPM required for the SPIRAL 2 LINAC. The BPM sensors are now completed and tested. The design of the acquisition card for the BPM is given and will be described. The prototype card is now under test and the first results are given. The aim is to verify the main parameters: sensitivity, position and phase measurement and the appropriate behavior of the BPM acquisition card in all cases (pulsed, electrode signal reconstruction, interlock, post mortem)

WEPC20	Bunch Extension Monitor for LINAC of SPIRAL2 facility	linac, MCP, photon, diagnostics	720
	R.V. Revenko, J.L. Vignet GANIL, Caen, France
	Funding: This work is funded in frame of CRISP project. Measurements of the bunch longitudinal shape of beam particles are crucial for optimization and control of the LINAC beam parameters and maximization of its integrated luminosity. The non-interceptive bunch extension monitor for LINAC of SPIRAL2 facility is being developed at GANIL. The five bunch extension monitors are to be installed on the entrance of LINAC between superconducting cavities. The principle of monitor operation is based on registration of x-rays induced by ions of accelerator beam and emitted from thin tungsten wire. The monitor consists of two parts: system for wire insertion and positioning and x-ray detector based on microchannel plates. The prototype of detector has been developed and was tested using protons and heavy ions beams.
	Poster WEPC20 [9.366 MB]

WEPF01	Alignment of a Nozzle-Skimmer System for a Non Invasive Gas Jet Based Beam Profile Monitor	alignment, laser, vacuum, electron	803
	V. Tzoganis, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom V. Tzoganis, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: Work supported by EU under contract 215080, Helmholtz Association and GSI under contract VH-BG-328, STFC under the Cockcroft Institute Core Grant No.ST/G008248/1 and a Liverpool - Riken fellowship. A non-invasive gas jet-based beam profile monitor has been developed in the QUASAR Group at the Cockcroft Institute, UK. This shall allow monitoring ultra-low energy, as well as high energy particle beams in a way that causes least disturbance to both, primary beam and accelerator vacuum. In this setup a nozzle-skimmer system is used to generate a thin supersonic curtain-shaped gas jet. However, very small diameters of both, the gas inlet nozzle and subsequent skimmers, required to shape the jet, have caused problems in monitor operation in the past. Here, an image processing based technique is presented which follows after careful manual initial alignment using a laser beam. An algorithm has been implemented in Labview and offers a semi-automated and straightforward solution for all previously encountered alignment issues. The procedure is presented in detail and experimental results are shown.
	Poster WEPF01 [0.863 MB]

WEPF07	Profile Grid Monitor and First Measurement Results at the MedAustron Accelerator	controls, CERN, feedback, beam-transport	822
	M. Repovz, A. Gyorgy, A. Kerschbaum, F. Osmic, S.M. Schwarz EBG MedAustron, Wr. Neustadt, Austria G. Burtin CERN, Geneva, Switzerland
	MedAustron is an ion beam therapy center located in Wiener Neustadt, Austria. The design is based on CERN’s Proton-Ion Medical Machine Study and the project is currently in the installation and commissioning phase. This paper summarizes the design, production and commissioning of MedAustron’s beam profile grid monitor. This monitor measures the beam profile in the low and medium energy beam transfer line where the beam dimensions can be as large as 100 mm. Reasonable position resolution is achieved with a harp consisting of 64 wires per plane and a pitch of up to 1.7 mm. Special effort was needed to produce such harps and bring the signal cables out of the vacuum. As the readout electronics has to cope with DC as well as pulsed beam all 128 wires are acquired simultaneously. This is achieved by integrating the charge during the “flat-top” of the beam pulse and storing it for serial transmission to the back end electronics for conversion. The high accuracy requires calibration of offset and amplification errors for every single channel. A NI PXI FPGA card controls the readout chain. The code for controlling the readout, including the graphical interface, is written in NI LabView.

WEPF26	Test Bench Experiments for Energy Measurement and Beam Loss of ESS-Bilbao	beam-losses, rfq, ESS, diagnostics	876
	S. Varnasseri, I. Arredondo, D. Belver, P. Echevarria, M. Eguiraun ESS Bilbao, Zamudio, Spain
	Various test benches have been developed at ESS-Bilbao in order to characterize different beam diagnostics and control systems prior to their installation on various parts of the accelerator. One test bench includes time-of-flight (TOF) characterization for energy measurement using fast current transformers (FCT). Using FCTs for the TOF measurement would allow us to measure accurately the delay between two successive bunched or un-bunched beam pulses of low energy ions. The other test bench includes a beam loss monitoring and interlock system using ACCTs, cRIO and PXI chassis with some acquisition modules and optical fiber link which represent a complete system of beam loss detection, interlock logic and trigger signal transmission. Having an integration on the ACCT output also allows us to measure the beam charge at the location of monitoring. In the test benches the functionality of hardware and software, the logic and required signal specifications like rise time, jitters and delays are measured. An overview of test benches and their measurement results are reported in this paper.
	Poster WEPF26 [1.120 MB]

WEPF33	Measurement and Control of the Beam Intensity for the SPIRAL2 Accelerator	controls, SPIRAL2, monitoring, linac	900
	S.L. Leloir, T.A. André, B. Ducoudret, C. Jamet, G. Ledu, C. Potier de courcy GANIL, Caen, France
	The phase 1 of the SPIRAL2 facility is under construction at the GANIL (Caen, France). The accelerator including a RFQ and a superconducting linac will product deuteron, proton and heavy ion beams in a wide range of intensities and energies (beam power range: a few 100W to 200kW). The measurements of the beam intensities are ensured by several AC and DC Current Transformers (ACCT/DCCT). These measurements are required for the accelerator tuning and the beam controls for safety requests during the daily operation. The uncertainty has to be taken into account to determine the threshold value. This paper presents the measuring chain description of ACCT/DCCT, the signal processing by integration and the uncertainty studies.
	Poster WEPF33 [3.132 MB]

Paper

Title

Other Keywords

Page

MOBL2

Thermalized and Reaccelerated Beams at the National Superconducting Cyclotron Laboratory

acceleration, diagnostics, cyclotron, injection

19

S.J. Williams, T. Baumann, K. Cooper, A. Lapierre, D. Leitner, D.J. Morrissey, G. Perdikakis, J.A. Rodriguez, S. Schwarz, A. Spyrou, M. Steiner, C. Sumithrarachchi
NSCL, East Lansing, Michigan, USA
W. Wittmer
FRIB, East Lansing, Michigan, USA

Funding: This work is supported by the National Science Foundation under contract number RC100609.
The National Superconducting Cyclotron Laboratory at Michigan State University is a Radioactive Ion Beam (RIB) facility providing beams of exotic nuclear species through projectile fragmentation. The Coupled Cyclotron Facility accelerates stable ion beams to ~100 MeV/A which are then fragmented and selected with the A1900 separator. A recent addition to NSCL is the gas stopping facility which thermalizes the high energy beam. The RIBs are extracted at <60keV and selected by A/Q for further transport to the low energy areas, currently consisting of the BECOLA beam cooling and laser spectroscopy system, and LEBIT Penning trap. RIBs up to 6 MeV/A will be provided by the ReA post-accelerator, currently consisting of an EBIT, RFQ and superconducting RF cavities. Energies up to 1.5 MeV/A are presently available, and energy increases will be phased in with the addition of further cryomodules. In a campaign of commissioning experiments, RIBs from a fragmentation facility were thermalized and post-accelerated for the first time. Preliminary results will be presented, focussing on the diagnostic challenges of detecting and characterizing beams over a wide range of energy and rate.

Slides MOBL2 [2.084 MB]

MOPC46

Beam Loss Monitor System for Low-Energy Heavy-Ion FRIB Accelerators

radiation, beam-losses, background, heavy-ion

186

Z. Liu, T. Russo, R.C. Webber, Y. Yamazaki, Y. Zhang
FRIB, East Lansing, Michigan, USA

Funding: Work is supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
Radiation transport simulations reveal shortcomings in the use of ion chambers for the detection of beam losses in low-energy, heavy-ion accelerators like FRIB. Radiation cross-talk effects due to the specific FRIB paper-clip geometry complicate locating specific points of beam loss. We describe an economical and robust solution that complements ionization chambers. A specifically designed device, the halo monitor ring (HMR), is implemented upstream of each cryomodule to detect beam loss directly. Together with fast response neutron scintillators, the new integrated BLM system satisfies both machine protection and sensitivity requirements.

Poster MOPC46 [1.014 MB]

MOPF09

A Gas-Jet Profile Monitor for the CLIC Drive Beam

electron, CLIC, space-charge, focusing

224

A. Jeff, E.B. Holzer, T. Lefèvre
CERN, Geneva, Switzerland
A. Jeff, V. Tzoganis, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
V. Tzoganis, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

The Compact LInear Collider (CLIC) will use a novel acceleration scheme in which energy extracted from a very intense beam of relatively low-energy electrons (the Drive Beam) is used to accelerate a lower intensity Main Beam to very high energy. The high intensity of the Drive Beam, with pulses of more than 10¹⁵ electrons, poses a challenge for conventional profile measurements such as wire scanners. Thus, new non-invasive profile measurements are being investigated. Profile monitors using gas ionisation or fluorescence have been used at a number of accelerators. Typically, extra gas must be injected at the monitor and the rise in pressure spreads some distance down the beampipe. In contrast, a gas jet can be fired across the beam into a receiving chamber, with little gas escaping into the rest of the beam pipe. In addition, a gas jet shaped into a thin plane can be used like a screen on which the beam cross-section is imaged. In this paper we present some arrangements for the generation of such a jet. In addition to jet shaping using nozzles and skimmers, we propose a new scheme to use matter-wave interference with a Fresnel Zone Plate to bring an atomic jet to a narrow focus.

MOPF13

Transverse Beam Profiling for FAIR

IPM, GSI, OTR, UNILAC

232

M. Schwickert, C.A. Andre, F. Becker, P. Forck, T. Giacomini, E. Gütlich, T. Hoffmann, A. Lieberwirth, S. Löchner, A. Reiter, B. Voss, B. Walasek-Höhne, M. Witthaus
GSI, Darmstadt, Germany

The FAIR facility will provide intense primary beams of protons and heavy ions, or secondary beams of antiproton and rare isotopes. The operation includes fixed-target experiments or subsequent facilities of independent storage rings and experiment beam lines. The particle beams greatly differ in ion species, intensity, time structure, spot size and stopping power. Therefore, transverse beam profile measurements require a careful choice of detector type for each location in order to cope with the large dynamic range and operational demands. This contribution presents the actual status of FAIR detector developments for intercepting devices (SEM-Grids, Multi-Wire Proportional Chambers, Scintillating Screens) as well as non-intercepting Beam Induced Fluorescence Monitors and Ionization Profile Monitors. Recently, promising results were obtained with slow extracted heavy ion beams in measurements of optical transmission radiation emitted from thin metal foils. The boundaries for the application area are described and basic detector parameters are summarized.

MOPF14

Scintillation Screen Response to Heavy Ion Impact

GSI, UNILAC, radiation, transverse

235

E. Gütlich, O.K. Kester
IAP, Frankfurt am Main, Germany
P. Forck, O.K. Kester
GSI, Darmstadt, Germany

For quantitative transverse ion beam profile measurement, imaging properties of scintillation screens have been investigated for the working conditions of the GSI linear accelerator. In the ion energy range between 4.8 and 11.4 MeV/u the imaging properties of the screens are compared with profiles obtained using standard techniques like SEM grids and scraper. Detailed investigations with e.g. Calcium and Argon ion beams on various radiation-hard materials show that the measured beam profiles can differ from those measured with standard methods and depend on several beam and material parameters *. For the practical usage of scintillators, it is necessary to have predictions for the response of the scintillator to a given ion beam. An existing model for the light output of scintillators for single particle irradiation has been extended to include the effect of overlapping excitation tracks. To validate the model, dedicated measurements with well-defined Carbon and Titanium ion beams at 11.4 MeV/u have been carried out. To understand the mechanisms, the beam flux and the pulse length has been varied. The measured light yield is compared to the model calculations.
* E. Gütlich et al., “Scintillation screen studies for high dose ion beam applications”, IEEE Transactions on Nuclear Science, Vol. 59, No. 5, October 2012, pp. 2354 – 2359.

Poster MOPF14 [0.818 MB]

MOPF31

Design and Performance of the Biased Drift Tube System in the BNL Electron Lens

RHIC, electron, beam-losses, vacuum

291

T.A. Miller, W. Fischer, D.M. Gassner, X. Gu, A.I. Pikin, S. Polizzo, P. Thieberger
BNL, Upton, Long Island, New York, USA
J. Barth
Barth Electronics, Boulder City, USA

Funding: Work supported by U.S. DOE under contract No DE-AC02-98CH10886 with the U.S. Department of Energy.
The installation of the Electron Lenses in RHIC will be completed this year. Its design includes a series of drift tubes through which the electron beam copropagates, with the RHIC proton beams. These drift tubes are used to create an electric field gradient to sweep out ions that become trapped within the central magnetic field where the electron beam interacts with the proton beams. These isolated drift tubes are biased by high voltage power supplies. Without a path for the proton beam image currents, high voltages will develop on the drift tubes that can be detrimental to the electron beam and increase the RHIC machine impedance. This paper presents the design of the drift tubes, axial electric field gradient, and the custom high voltage RF bias tees that were designed to provide separate paths for the high frequency image currents and the DC high voltage bias over the same cables. The design and simulation of the bias tee is discussed, as well as RF signals from the proton beam current imaged on the drift tubes, as measured through the bias tees during the commissioning of the blue RHIC beam electron lens this past spring.

Poster MOPF31 [31.237 MB]

TUCL3

Gas Electron Multipliers Versus Multi Wire Proportional Chambers

CERN, electron, antiproton, transverse

342

S.C. Duarte Pinto
Delft University of Technology, Opto-electronic Section, Delft, The Netherlands
J. Spanggaard
CERN, Geneva, Switzerland

Gas Electron Multiplication technology is finding more and more applications in beam instrumentation and at CERN these detectors have recently been adapted for use in transverse profile measurements at several of our facilities. In the experimental areas of CERN’s Antiproton Decelerator, low energy Gas Electron Multipliers successfully replaced all Multi-Wire Proportional Chambers in 2012 and another detector type has now been developed for high energy applications in the experimental areas of the SPS, totalling a potential of more than a hundred profile detectors to be replaced by GEM detectors of different types. This paper aims to describe the historical evolution of GEM technology by covering the many different applications but with specific focus on its potential to replace Multi-Wire Proportional Chambers for standard transverse profile measurement.

Slides TUCL3 [3.275 MB]

TUPC01

Overview of the European Spallation Source Warm Linac Beam Instrumentation

linac, ESS, diagnostics, emittance

346

B. Cheymol, C. Böhme, I. Dolenc Kittelmann, H. Hassanzadegan, A. Jansson, T.J. Shea, L. Tchelidze
ESS, Lund, Sweden

The normal conducting front end of the European Spallation source will accelerate the beam coming for the ion source up to 90 MeV. The ESS front end will consist in an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line and a drift tube linac. The warm linac will be equipped with beam diagnostics to measure the beam position, the transverse and longitudinal profile as well as beam current and beam losses. This will provide efficient operation of ESS, and ensure keeping the losses at a low level. This paper gives an overview of the beam diagnostics design and their main features.

TUPC46

Beam Loss Monitoring Study for SIS100@FAIR

beam-losses, simulation, GSI, SIS

485

V.S. Lavrik, L.H.J. Bozyk, O.K. Kester, A. Reiter
GSI, Darmstadt, Germany
O.K. Kester, V.S. Lavrik
IAP, Frankfurt am Main, Germany

FAIR, the facility for antiproton and ion research, is a multi-disciplinary accelerator facility which will extend the existing GSI complex in Darmstadt, Germany. In the FAIR start version, the new synchrotron SIS100 will provide proton or heavy ion beams for a variety of experiments. The GSI synchrotron SIS18 will operate as injector for SIS100. The current study focuses on beam loss measurements for SIS18 and SIS100. The aim of this study is to find quantitative methods to measure beam losses around the machine, mainly SIS100, on an absolute scale. The contribution will present results of two pilot experiments carried out in the high-energy beam lines and at the SIS18 with Uranium ions in the energy range up to 900 MeV/u. In the first experiment the Uranium beam was totally stopped in a Copper target and the particle shower measured with LHC-type ionization chambers. In the second experiment, the beam was slowly excited in the SIS18 synchrotron to create controlled losses on a scraper which were monitored by the DC current transformer and beam loss monitors. Experimental data are compared against the predictions of Fluka simulations.

Poster TUPC46 [5.404 MB]

TUPF02

Secondary Emission Monitor for keV Ion and Antiproton Beams

MCP, antiproton, electron, CERN

495

A.G. Sosa, E. Bravin, A. Jeff
CERN, Geneva, Switzerland
J. Harasimowicz, A. Jeff, A.G. Sosa, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
J. Harasimowicz, A. Jeff, A.G. Sosa, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: Work supported by the EU within the DITANET and CATHI projects under contracts 215080 and 264330, HGF and GSI under contract VH-NG-328 and STFC under the Cockcroft Institute core grant ST/G008248/1.
Beam profile monitoring of low intensity keV ion and antiproton beams remains a challenging task. A Secondary electron Emission Monitor (SEM) has been designed to measure profiles of beams with intensities below 10⁷ and energies as low as 20 keV. The monitor is based on a two stage microchannel plate (MCP) and a phosphor screen facing a CCD camera. Its modular design allows two different operational setups. In this contribution we present the design of a prototype and discuss results from measurements with protons at INFN-LNF and antiprotons at the AEgIS experiment at CERN*. This is then used for a characterization of the monitor with regard to its possible future use at different facilities.
* Measurements at the AD carried out with the AEgIS collaboration.

Poster TUPF02 [1.934 MB]

TUPF06

2D Wire Grid Integrated with Faraday Cup for Low Energy H⁻ Beam Analysis at Siemens Novel Electrostatic Accelerator

ion-source, electron, simulation, plasma

507

H. von Jagwitz-Biegnitz
JAI, Oxford, United Kingdom
P. Beasley, O. Heid
Siemens AG, Erlangen, Germany
D.C. Faircloth
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
A.J. Holmes
Marcham Scientific Ltd, Hungerford, United Kingdom
R.G. Selway
Inspired Engineering Ltd, Climping, United Kingdom

A wire grid with 21 wires each vertically and horizontally with a spacing of 1 mm has been developed for beam analysis at Siemens' novel electrostatic accelerator. The wire grid is integrated in a Faraday Cup and profile measurements can therefore be combined with current measurements. The grid is used to analyse the 10 keV H⁻ beam coming from the ion source and the obtained beam parameters will be used as input for simulations of the beam transport in the accelerator. All 42 wires can be read out simultaneously with a multi-channel precision electrometer and the data can be fitted instantly with LabVIEW code that was developed for this purpose. This paper reports on some details of the mechanical design and the data analysis procedure in LabVIEW as well as some results of first measurements at the novel accelerator.

TUPF10

A Non-Intercepting Beam Emittance Measurement Device Based on Neutral Beam Fluorescence Method at PKU

emittance, ion-source, transverse, dipole

522

S.X. Peng, J. Chen, Z.Y. Guo, H.T. Ren, Y. Xu, J. Zhao
PKU, Beijing, People's Republic of China
J.E. Chen, A.L. Zhang
Graduate University, Chinese Academy of Sciences, Beijing, People's Republic of China
L.T. Sun, H.W. Zhao
IMP, Lanzhou, People's Republic of China

A new concept to attain ion beam emmitance through measuring the forward neutral beam without intercepting the beam transportion was proposed at PKU. The forward neutral beam produced by space charge compensation and separated from the transporting ion beam with the help of a deflecting magnetic field, carries the entire emittance information of the original particle beam and becomes a fast and non-interceptive beam diagnostic tool. This idea was tested on PKU ion source test bench and the experimental results show that the neutral beam fluorescence method is feasible. Bases on these qualification results, a formal non-intercepting emittance measurement device was designed. It is a 90 degree full-scale dipole analysis magnet combining with the classical pepper-pot technique. Test and commissioning of the device are in progress. Details of design and comnissioning results will be presented in this paper.

TUPF15

Overview of Laserwire Beam Profile and Emittance Measurements for High Power Proton Accelerators

laser, linac, emittance, CERN

531

S.M. Gibson, G.E. Boorman, A. Bosco
Royal Holloway, University of London, Surrey, United Kingdom
G.E. Boorman, A. Bosco, S.M. Gibson
JAI, Egham, Surrey, United Kingdom
C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
T. Hofmann
CERN, Geneva, Switzerland
A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J.K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
J.K. Pozimski, P. Savage
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Laserwires were originally developed to measure micron-sized electron beams via Compton scattering, where traditional wire scanners are at the limit of their resolution. Laserwires have since been applied to larger beam-size, high power H⁻ ion beams, where the non-invasive method can probe beam densities that would damage traditional diagnostics. While photo-detachment of H⁻ ions is now routine to measure beam profiles, extending the technique to transverse and longitudinal emittance measurements is a key aim of the laserwire emittance scanner under construction at the Front End Test Stand (FETS) at the RAL. A pulsed, 30kHz, 8kW peak power laser is fibre-coupled to motorized collimating optics, which controls the position and thickness of the laserwire delivered to the H⁻ interaction chamber. The laserwire slices out a beamlet of neutralized particles, which propagate to a downstream scintillator and camera. The emittance is reconstructed from 2D images as the laserwire position is scanned. Results from the delivery optics, scintillator tests and particle tracking simulations of the full system are reviewed. Plans to deploy the FETS laser system at the Linac4 at CERN are outlined.

Poster TUPF15 [9.196 MB]

TUPF16

Analysis of Measurement Errors of INR Linac Ionization Beam Cross Section Monitor

linac, space-charge, proton, simulation

535

S.A. Gavrilov, A. Feschenko, P.I. Reinhardt-Nickoulin, I.V. Vasilyev
RAS/INR, Moscow, Russia
A. Feschenko, S.A. Gavrilov
MIPT, Dolgoprudniy, Moscow Region, Russia

Residual gas ionization beam cross section monitors (BCSM) are installed at LEBT and HEBT of INR RAS proton linac to measure cross section, profiles and position of the beam. BCSMs provide two-dimensional non-destructive real-time beam diagnostics at LINAC operation with repetition frequency from 1 to 50 Hz, pulses duration from 0.3 to 170 μs and wide range of amplitudes, particle energy 400 keV and 209 MeV. The analysis of systematic measurements errors (accuracy) because of nonuniform electrostatic fields, determined by BCSM design features, is presented. New detector model, minimizing these nonuniformities, is shown. Besides that, the analysis of statistical errors (precision) due to the method features, in particular, ions thermal motion and a beam space charge, is done. The simulation results make it possible to estimate measured cross sections size, profiles and beam positions and to draw conclusions about the reliability of BCSM results for beams with various parameters.

TUPF21

Response of Scintillating Screens to Fast and Slow Extracted Ion Beams

extraction, target, GSI, radiation

553

A. Lieberwirth, W. Ensinger
TU Darmstadt, Darmstadt, Germany
P. Forck, B. Walasek-Höhne
GSI, Darmstadt, Germany

Funding: Funded by German Ministry of Science (BMBF), contract number 05P12RDRBJ
For the FAIR project, imaging properties of inorganic scintillators for high energetic heavy ion beams were studied. In order to investigate the characteristics of scintillation response and transverse beam profile, several experiments were conducted with slow (200 ms) and fast (1 μs) extracted 350 MeV/u Uranium beams from SIS18. The extracted particle number was varied between 10⁵ and 10⁹ particles per pulse for the irradiation of seven different scintillators: YAG:Ce-crystals with different qualities, pure and Cr-doped alumina as well as two phosphors P43 and P46. Additionally radiation resistance tests for all phosphor screens and the Cr-doped alumina screen were performed by irradiating with more than 700 pulses with 10⁹ ions each. Linear response in scintillation light output as well as realistic statistical moments over the large range of ion intensities are presented for each material. Only minor changing in target response was observed after 45 minutes of permanent irradiation.

Poster TUPF21 [2.601 MB]

TUPF24

Instrumentation for the Proposed Low Energy RHIC Electron Cooling Project

electron, RHIC, diagnostics, emittance

561

D.M. Gassner, A.V. Fedotov, D. Kayran, V. Litvinenko, R.J. Michnoff, T.A. Miller, M.G. Minty, I. Pinayev, M. Wilinski
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
There is a strong interest in running RHIC at low ion beam energies of 2.5-20GeV/nucleon; this is much lower than the typical operations with 100GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. Simulations and conceptual cooling sub-system designs are underway. The present plan is to provide 10–50mA of bunched electron beam with adequate quality and an energy range of 0.9–5MeV. The preliminary cooling facility configuration planned to be fully inside the RHIC tunnel will include a 102.74MHz SRF gun, a booster cavity, a beam transport to the Blue ring to allow electron-ion co-propagation for ~10-20m, then a 180 degree u-turn electron transport so the same electron beam can similarly cool the Yellow ion beam, then to a dump. The electron beam instrumentation systems that will be described include current transformers, BPMs, profile monitors, a pepper pot emittance station and loss monitors.

Poster TUPF24 [1.588 MB]

WEPC02

Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK

rfq, ion-source, quadrupole, diagnostics

652

G. Turemen, B. Yasatekin
Ankara University, Faculty of Sciences, Ankara, Turkey
Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu
TAEK, Ankara, Turkey
E. Cavlan
TOBB ETU, Ankara, Turkey
M. Celik, Z. Sali
Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey
S. Erhan
UCLA, Los Angeles, California, USA
Ö. Mete
UMAN, Manchester, United Kingdom
G. Unel
UCI, Irvine, California, USA

The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H⁺ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H⁺ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.

Poster WEPC02 [25.664 MB]

WEPC04

Beam Diagnostics for Commissioning and Operation of a Novel Compact Cyclotron for Radioisotope Production

diagnostics, cyclotron, ion-source, target

660

I. Podadera, B. Ahedo, P. Arce, L. García-Tabarés, D. Gavela, A. Guirao, J.I. Lagares, L.M. Martinez, D. Obradors-Campos, C. Oliver, J.M. Perez Morales, F. Sansaloni, F. Toral
CIEMAT, Madrid, Spain

Funding: Work partially funded by the CDTI and supported by the Spanish Ministry of Science and Innovation under project AMIT, within the subprogramme CENIT-2009.
The AMIT cyclotron will be a 8.5 MeV, 10 μA CW H⁻ accelerator which aims to deliver a beam for radioisotope production. In order to properly validate all the beam commissioning steps, a set of diagnostics needs to be implemented. They must cover all the commissioning phases: ion source characterization, medium energy acceleration and nominal energy at full current. Due to compactness of the design, the number of beam diagnostics is limited and restricted to the most essential ones during operation. An overview of the diagnostics that are planned for the characterization of the cyclotron will be discussed in this contribution. In all the commissioning phases, beam current probes are essential to validate the cyclotron and each subsystem. As a main diagnostic, a moveable probe has been designed and simulated for optimization of the cyclotron. The thermal simulations of the probe and the mechanical integration will be presented.

WEPC15

Development of the Beam Position Monitors System for the LINAC of SPIRAL2

BPM, linac, SPIRAL2, transverse

702

P. Ausset, M. Ben Abdillah, J. Lesrel, E. Marius
IPN, Orsay, France
T. Ananthkrishnan, S.K. Bharade, G. Joshi, P.D. Motiwala, C.K. Pithawa
BARC, Trombay, Mumbai, India
V. Nanal, R.G. Pillay
TIFR, Mumbai, India

The SPIRAL 2 facility will deliver stable heavy ion and deuteron beams at very high intensity, producing and accelerating light and heavy rare ion beams. The driver will accelerate between 0.15mA and 5 mA deuteron beam up to 20 MeV/u and q/A=1/3 heavy ions up to 14.5 MeV/u. It is being built on the site of the Grand Accelerator National d’Ions Lourds at CAEN (France) The accurate tuning of the LINAC is essential for the operation of SPIRAL2 and requires from the Beam Position Monitor (BPM) system the measurements of the beam transverse position, the phase of the beam with respect to the radiofrequency voltage and the beam energy. This paper addresses the advancement made during the last twelve months on the realization of the 22 BPM required for the SPIRAL 2 LINAC. The BPM sensors are now completed and tested. The design of the acquisition card for the BPM is given and will be described. The prototype card is now under test and the first results are given. The aim is to verify the main parameters: sensitivity, position and phase measurement and the appropriate behavior of the BPM acquisition card in all cases (pulsed, electrode signal reconstruction, interlock, post mortem)

WEPC20

Bunch Extension Monitor for LINAC of SPIRAL2 facility

linac, MCP, photon, diagnostics

720

R.V. Revenko, J.L. Vignet
GANIL, Caen, France

Funding: This work is funded in frame of CRISP project.
Measurements of the bunch longitudinal shape of beam particles are crucial for optimization and control of the LINAC beam parameters and maximization of its integrated luminosity. The non-interceptive bunch extension monitor for LINAC of SPIRAL2 facility is being developed at GANIL. The five bunch extension monitors are to be installed on the entrance of LINAC between superconducting cavities. The principle of monitor operation is based on registration of x-rays induced by ions of accelerator beam and emitted from thin tungsten wire. The monitor consists of two parts: system for wire insertion and positioning and x-ray detector based on microchannel plates. The prototype of detector has been developed and was tested using protons and heavy ions beams.

Poster WEPC20 [9.366 MB]

WEPF01

Alignment of a Nozzle-Skimmer System for a Non Invasive Gas Jet Based Beam Profile Monitor

alignment, laser, vacuum, electron

803

V. Tzoganis, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
V. Tzoganis, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: Work supported by EU under contract 215080, Helmholtz Association and GSI under contract VH-BG-328, STFC under the Cockcroft Institute Core Grant No.ST/G008248/1 and a Liverpool - Riken fellowship.
A non-invasive gas jet-based beam profile monitor has been developed in the QUASAR Group at the Cockcroft Institute, UK. This shall allow monitoring ultra-low energy, as well as high energy particle beams in a way that causes least disturbance to both, primary beam and accelerator vacuum. In this setup a nozzle-skimmer system is used to generate a thin supersonic curtain-shaped gas jet. However, very small diameters of both, the gas inlet nozzle and subsequent skimmers, required to shape the jet, have caused problems in monitor operation in the past. Here, an image processing based technique is presented which follows after careful manual initial alignment using a laser beam. An algorithm has been implemented in Labview and offers a semi-automated and straightforward solution for all previously encountered alignment issues. The procedure is presented in detail and experimental results are shown.

Poster WEPF01 [0.863 MB]

WEPF07

Profile Grid Monitor and First Measurement Results at the MedAustron Accelerator

controls, CERN, feedback, beam-transport

822

M. Repovz, A. Gyorgy, A. Kerschbaum, F. Osmic, S.M. Schwarz
EBG MedAustron, Wr. Neustadt, Austria
G. Burtin
CERN, Geneva, Switzerland

MedAustron is an ion beam therapy center located in Wiener Neustadt, Austria. The design is based on CERN’s Proton-Ion Medical Machine Study and the project is currently in the installation and commissioning phase. This paper summarizes the design, production and commissioning of MedAustron’s beam profile grid monitor. This monitor measures the beam profile in the low and medium energy beam transfer line where the beam dimensions can be as large as 100 mm. Reasonable position resolution is achieved with a harp consisting of 64 wires per plane and a pitch of up to 1.7 mm. Special effort was needed to produce such harps and bring the signal cables out of the vacuum. As the readout electronics has to cope with DC as well as pulsed beam all 128 wires are acquired simultaneously. This is achieved by integrating the charge during the “flat-top” of the beam pulse and storing it for serial transmission to the back end electronics for conversion. The high accuracy requires calibration of offset and amplification errors for every single channel. A NI PXI FPGA card controls the readout chain. The code for controlling the readout, including the graphical interface, is written in NI LabView.

WEPF26

Test Bench Experiments for Energy Measurement and Beam Loss of ESS-Bilbao

beam-losses, rfq, ESS, diagnostics

876

S. Varnasseri, I. Arredondo, D. Belver, P. Echevarria, M. Eguiraun
ESS Bilbao, Zamudio, Spain

Various test benches have been developed at ESS-Bilbao in order to characterize different beam diagnostics and control systems prior to their installation on various parts of the accelerator. One test bench includes time-of-flight (TOF) characterization for energy measurement using fast current transformers (FCT). Using FCTs for the TOF measurement would allow us to measure accurately the delay between two successive bunched or un-bunched beam pulses of low energy ions. The other test bench includes a beam loss monitoring and interlock system using ACCTs, cRIO and PXI chassis with some acquisition modules and optical fiber link which represent a complete system of beam loss detection, interlock logic and trigger signal transmission. Having an integration on the ACCT output also allows us to measure the beam charge at the location of monitoring. In the test benches the functionality of hardware and software, the logic and required signal specifications like rise time, jitters and delays are measured. An overview of test benches and their measurement results are reported in this paper.

Poster WEPF26 [1.120 MB]

WEPF33

Measurement and Control of the Beam Intensity for the SPIRAL2 Accelerator

controls, SPIRAL2, monitoring, linac

900

S.L. Leloir, T.A. André, B. Ducoudret, C. Jamet, G. Ledu, C. Potier de courcy
GANIL, Caen, France

The phase 1 of the SPIRAL2 facility is under construction at the GANIL (Caen, France). The accelerator including a RFQ and a superconducting linac will product deuteron, proton and heavy ion beams in a wide range of intensities and energies (beam power range: a few 100W to 200kW). The measurements of the beam intensities are ensured by several AC and DC Current Transformers (ACCT/DCCT). These measurements are required for the accelerator tuning and the beam controls for safety requests during the daily operation. The uncertainty has to be taken into account to determine the threshold value. This paper presents the measuring chain description of ACCT/DCCT, the signal processing by integration and the uncertainty studies.

Poster WEPF33 [3.132 MB]