Keyword: booster
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MOEPPB006 Formation of Beams in the Ion Accelerator Complex of the Medium Energy Electron Ion Collider Facility at JLab ion, proton, acceleration, collider 88
 
  • S.L. Manikonda, P.N. Ostroumov
    ANL, Argonne, USA
  • B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
At the interaction point of the Medium Energy Electron Ion Collider (MEIC) facility the luminosity of 1033cm-2s-1 will be achieved through the collision of counter rotating beams of 0.5A ions and 3A electrons at 750MHz frequency. Formation of ion beams at MEIC is carried out in the Ion Accelerator Complex (IAC) comprising of a linac, pre-booster ring, booster ring, and a collider ring. We will describe the scheme proposed for the formation of ion beams at MEIC facility from the point of view of longitudinal beam dynamics. The proposed scheme minimizes losses due to space charge effects at low energies and needs moderate RF requirements already achieved at other existing facilities. Simulation studies have been conducted to verify the proposed scheme. We will present the results of these simulation studies. 		 
 
MOPPC077 Simulation and Analysis of the Beam Signal in Taiwan Photon Source Booster lattice, betatron, multipole, synchrotron 313
 
  • C.C. Chiang, H.-P. Chang, P.J. Chou
    NSRRC, Hsinchu, Taiwan
  • S.-Y. Lee
    IUCEEM, Bloomington, Indiana, USA
  
  The TPS (Taiwan Photon Source) booster is a combined function FODO lattice with six super-periods; the total circumference is 496.8 m. To prepare the analysis tools for beam commissioning, we simulate the TPS booster turn-by-turn BPM data with two programs, MAD-X PTC and Tracy-2.6, which are for both DC (constant beam energy) and AC (beam energy in regular ramping) modes. We analyze the simulation data with MIA (Model Independent Analysis) and ICA (Independent Component Analysis), in order to reconstruct beam parameters like beta function, phase advance, dispersion, etc. We include multipole errors, alignment errors, BPM noises or other noises in simulation, and try to design a good strategy for real data analysis.  
 
MOPPD083 Improving the Fermilab Booster Notching Efficiency, Beam Losses and Radiation Levels kicker, radiation, injection, beam-losses 562
 
  • I.L. Rakhno, A.I. Drozhdin, N.V. Mokhov, V.I. Sidorov, I.S. Tropin
    Fermilab, Batavia, USA
  
  Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
Currently a fast vertical 1.08-m long kicker (notcher) located in the Fermilab Booster Long-5 straight section is used to remove 3 out of 84 circulating bunches after injection to generate an abort gap. With magnetic field of 72.5 Gauss it removes only 87% of the 3-bunch intensity at 400 MeV, with 75% loss on pole tips of the focusing Booster magnets, 11% on the Long-6 collimators, and 1% in the rest of the ring. We propose to improve the notching efficiency and reduce beam loss in the Booster by using two horizontal kickers in the Long-12 section. The STRUCT calculations show that using such horizontal notchers, one can remove up to 99% of the 3-bunch intensity at 400-700 MeV, directing 96% of it to a new beam dump at the Long-13 section. This fully decouples notching and collimation. The beam dump absorbs most of the impinging proton energy in its jaws. The latter are encapsulated into an appropriate radiation shielding that reduces impact on the machine components, personnel and environment to the tolerable levels. The MARS simulations show that corresponding prompt and residual radiation levels can be reduced ten times compared to the current ones. 		 
 
MOPPP015 Status of the BERLinPro Energy Recovery Linac Project cavity, linac, SRF, quadrupole 601
 
  • J. Knobloch, M. Abo-Bakr, W. Anders, R. Barday, K.B. Bürkmann-Gehrlein, V. Dürr, S.C. Heßler, A. Jankowiak, T. Kamps, O. Kugeler, B.C. Kuske, P. Kuske, A.N. Matveenko, G. Meyer, R. Müller, A. Neumann, K. Ott, Y. Petenev, D. Pflückhahn, T. Quast, J. Rahn, S.G. Schubert
    HZB, Berlin, Germany
  
  Funding: Funding provided by the BMBF and the State of Berlin
In October 2010 Helmholtz Zentrum Berlin received funding to design and build the Berlin Energy Recovery Linac Project BERLinPro. The goal of this compact ERL is to develop the accelerator physics and technology required to generate and accelerate a 100-mA, 1 mm·mrad emittance beam. Given the flexibility of ERLs, other operation modes such as short-bunch operation will also be investigated. The BERLinPro technology and know-how can then be transferred to a variety of ERL-based applications. Presently, BERLinPro is in the design phase and the optics has been settled. Furthermore, first beam has been achieved with a superconducting RF photoinjector, which represents an important step towards realizing a CW injector for BERLinPro. An overview of the present status and the conceptual design report is presented. 		 
 
MOPPP021 Longitudinal Beam Dynamics at the ALICE Acclerator R&D Facility linac, simulation, gun, FEL 610
 
  • F. Jackson, D. Angal-Kalinin, S.P. Jamison, J.W. McKenzie, T.T. Ng, Y.M. Saveliev, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The ALICE facility is an energy recovery test accelerator whose applications include an IR-FEL and THz generation. Of primary importance to the performance of the main ALICE applications is the understanding and control of the longitudinal dynamics, which are less amenable to measurement than the transverse. The longitudinal dynamics of the beam evolve are studied in simulation and experiment in several areas of the machine. Simulations of the low energy injector where space charge and velocity bunching may occur are presented. Path length measurement using time-of-arrival monitors are carried out.  
 
MOPPP023 Effect of DC Photoinjector Gun Voltage on Beam Dynamics in ALICE ERL gun, electron, linac, cavity 616
 
  • Y.M. Saveliev, F. Jackson, J.K. Jones, J.W. McKenzie
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The ALICE ERL employs a DC HV photoelectron gun as an electron source. As with other machines in this class, the electron beam is not always of perfect quality. This is aggravated by that the ALICE gun has been operated so far at lower 230kV voltage compared to the design value of 350kV due to hardware limitations. The “two beams” structure was observed and experimentally investigated and found to be the result of complex processes during initial stages of beam acceleration. The experimental observations and data will be compared with those obtained at a nominal 350kV gun voltage. An investigation of the effect of the DC photogun voltage on longitudinal and transverse beam dynamics will be presented and discussed.  
 
MOPPP051 NSLS-II Transport Line Progress linac, storage-ring, diagnostics, injection 676
 
  • R.P. Fliller, A.T. Anderson, B. Benish, W. DeBoer, G. Ganetis, R. Heese, H.-C. Hseuh, J. Hu, M.P. Johanson, B.N. Kosciuk, D. Padrazo, K. Roy, T.V. Shaftan, O. Singh, J.L. Tuozzolo, B. Wahl, G.M. Wang
    BNL, Upton, Long Island, New York, USA
  
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The National Synchrotron Light Source II (NSLS-II) is a state-of-the-art 3-GeV third generation light source currently under construction at Brookhaven National Laboratory. The NSLS-II injection system consists of a 200 MeV linac, a 3-GeV booster synchrotron and associated transfer lines. The first part of the Linac to Booster Transport (LBT) line has been installed for linac commissioning. This part includes all components necessary to commission the NSLS-II linac. The second part of this transport line is undergoing installation. Initial results of hardware commissioning will be discussed. The Booster to Storage Ring (BSR) transport line underwent a design review. The first part of the BSR transport line, consisting of all components necessary to commission the booster will be installed in 2012 for booster commissioning. We report on the final design of the BSR line along with the plan to commission the booster. 		 
 
MOPPP052 Booster Synchrotron for SIRIUS Light Source injection, dipole, extraction, emittance 679
 
  • F. H. de Sá, L. Liu, A.R.D. Rodrigues
    LNLS, Campinas, Brazil
  
  A full energy 3 GeV booster for the new Brazilian Synchrotron Light Laboratory (LNLS) third generation light source, SIRIUS, is proposed. The 144 m circumference magnetic lattice consists of two super-periods of FODO cells with defocusing dipoles and focusing quadrupoles. The optics provides a low emittance beam of 38 nm.rad at 3 GeV, high horizontal betatron and zero dispersion functions at straight sections. The top-up operation requires a cycling energy ramp from 150 MeV to 3 GeV with repetition rate of 1 Hz.  
 
MOPPP057 Optimization of the Low-emittance Lattice of the APS Booster Synchrotron lattice, emittance, injection, sextupole 690
 
  • C. Yao, V. Sajaev, N. Sereno, H. Shang
    ANL, Argonne, USA
  
  Funding: Work supported by U.S. Department of Energy, Offices of Science, Office of Basic Energy Sciences, under contract No. DE-AC02-06- CH11357.
The APS booster is a 7GeV electron synchrotron. Three lattices have been originally designed with a nominal beam emittance of 132, 109, and 92 nm, respectively. In the past we have mostly operated the booster with the 132 nm lattice because of its better stability. The lower-emittance lattices are not utilized. In early 2010 we upgraded the booster ramp correction and reduced the 360Hz current ripples of the ramp supplies. Current ramp errors have been significantly reduced. This raises our interest in running the low- emittance lattice to improve APS storage ring injection efficiency and reduce radiation losses. This report presents the optimization methods and measurement results of booster beam performance of the booster 92nm lattice. 		 
 
MOPPP058 Improvements to the APS Booster Injection Controllaw Process injection, controls, lattice, synchrotron 693
 
  • C. Yao, F. Lenkszus, H. Shang, S. Xu
    ANL, Argonne, USA
  
  Funding: Work supported by U.S. Department of Energy, Offices of Science, Office of Basic Energy Sciences, under contract No. DE-AC02-06- CH11357.
The APS booster is a 7-GeV electron synchrotron with a 0.5-second cycle time. The booster runs a set of injection control programs that corrects the injection beam trajectory based on the beam history of two BPMs. An IOC process calculates the I and Q components of beam oscillation from turn-by turn beam position samples over the first 64 turns. The booster injection control programs apply phase, energy, and transverse angle correction based on the result of the IOC processing. The initial system was installed in 2007. Since installation the system has mostly worked well for normal user operations. However, occasionally the system has yielded inconsistent results. Recently we reviewed the signal and processes involved in this system and made necessary upgrades to some components, including selection of a new set of two input BPMs, optimization of FFT parameters, and addition of an injection tune control program. These upgrades have significantly improved the effectiveness and consistency of the system. We report the findings, analysis, and results. 		 
 
MOPPP060 Top-Off Mode of Operations: Setting Limits on the Extracted Beam Energy by Constraining Currents of Multiple Booster Dipole Power Supplies. dipole, extraction, lattice, injection 696
 
  • T.V. Shaftan
    BNL, Upton, Long Island, New York, USA
  
  In preparation for top-off mode of the NSLS-II operations we have studied impact of errors in the dipole power supply current on the extracted beam energy, which has to be interlocked so to satisfy the safety requirements. The NSLS-II booster dipole circuits are combined into 3 independent PS circuits, which adds complexity to the analysis of the extracted beam energy limits.  
 
MOPPR008 The Beam Loss Monitoring System at ELSA injection, extraction, electron, monitoring 786
 
  • D. Proft, A. Balling, F. Frommberger, W. Hillert
    ELSA, Bonn, Germany
  
  A new diagnostic tool to monitor beam loss in the storage ring at the Electron Stretcher Facility ELSA has been set up. It enables the investigation of causes for electron loss in real time, providing an essential tool needed to achieve the planned beam current upgrade from 30 mA to 200 mA. The monitoring system consists of 32 pin-diode based radiation detectors spread around the storage ring. Therefore, individual electron loss can be localized after each quadrupole. The readout system was designed to allow an integration of single loss events within 70 μs in order to be able to correlate these events to machine state changes. The used monitoring hardware and readout system will be detailed. Furthermore first measurements of the beam loss during injection, the fast energy ramp during acceleration and the extraction phase will be presented.  
 
MOPPR021 Commissioning of a New Beam-position Monitoring System at ANKA controls, brilliance, synchrotron, feedback 825
 
  • S. Marsching, N. Hiller, E. Huttel, V. Judin, B. Kehrer, M. Klein, C.A.J. Meuter, A.-S. Müller, M.J. Nasse, M. Schuh, N.J. Smale, M. Streichert
    KIT, Karlsruhe, Germany
  • G. Rehm
    Diamond, Oxfordshire, United Kingdom
  
  A new beam-position monitoring and diagnostic system is being commissioned at ANKA, the synchrotron light source of the Karlsruhe Institute of Technology. This system is based on 40 Libera Brilliance devices from Instrumentation Technologies. It provides turn-by-turn information about the beam position. This information can be used for beam diagnostics (e.g. finding the position where the beam is lost during injection phase) and can also form the base of a fast orbit-correction scheme. We have performed studies to assess the performance of the new BPM system in comparison to the old system being replaced. In order to optimize the commissioning process we have developed a scheme for switching to the new system gradually by integrating it with the MATLAB Middle-Layer using EPICS control software. In this contribution we present the results of our comparison of the two BPM systems and provide an insight into the experience gained during the commissioning process.  
 
MOPPR051 TLS Transportline BPM Upgrade injection, EPICS, diagnostics, storage-ring 897
 
  • P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  There are seven stripline beam position monitor (BPM) installed in TLS booster to storage ring transport line. In order to provide the BPM system with better performance and functionalities, the latest generation BPM electronics Libera SinglePass had been adopted in TLS transport line for these stripline BPM. One unit had been tested in early 2011 and delivered the reliable and satisfactory results therefore extra six units had been purchased later. Currently, all of the new 7 units have replaced the past BPM electronics. The application had also been continuously developed. On the other hand, it is expected that the upgrade could enhance diagnostic functionalities for the related injection study. In this report, the injection stability and efficiency had been investigated.  
 
MOPPR092 SVD-BASED METHOD FOR MEASUREMENT OF BEAM PARAMETERS AND FLAG RESOLUTION emittance, quadrupole, simulation, focusing 999
 
  • G.M. Wang, R.P. Fliller, I. Pinayev, T.V. Shaftan
    BNL, Upton, Long Island, New York, USA
  
  In NSLS II booster to storage ring transport line, the typical beam size in vertical plane is ~60 μm, which requires very high flag resolution to get good beam parameters measurement. This paper describes a new SVD-based method to measure transverse beam parameters and flag resolution simultaneously with double quads scan. Implementation simulations of the proposed method are performed for a dispersion free region in the NSLS-II booster to storage ring transport line. With this method, it breaks the limitation of beam parameters measurement accuracy duo to the flag resolution.  
 
MOPPR094 Preparation for NSLS II Linac to Booster Transport Line Commissioning linac, controls, emittance, status 1002
 
  • G.M. Wang, M.A. Davidsaver, R.P. Fliller, G. Ganetis, H.-C. Hseuh, Y. Hu, D. Padrazo, T.V. Shaftan, G. Shen, O. Singh, Y. Tian, H. Xu, L. Yang
    BNL, Upton, Long Island, New York, USA
  
  The National Synchrotron Light Source II (NSLS-II) is a state-of-the-art 3-GeV third generation light source currently under construction at Brookhaven National Laboratory. The first part of the Linac to Booster Transport (LBT) line has been installed for the linac commissioning. This part will be used for the linac acceptance test. In this paper, we describe the preparation of the LBT sub-system integration test and the high level applications.  
 
TUEPPB008 Status Report on the Iranian Light Source Facility Project storage-ring, cavity, synchrotron, dipole 1131
 
  • J. Rahighi, H. Ajam, R. Aslani, S. Fatehi, H. Ghasem, M.R. Khabazi, R. Safian, E. Salimi, A. Shahveh
    IPM, Tehran, Iran
  • E. Ahmadi, M. Jafarzadeh, H.B. Jalali, M. Moradi, S. Pirani, M. Rahimi, A. Sadeghipanah, F. Saeidi, Kh.S. Sarhadi, A. Shahverdi
    ILSF, Tehran, Iran
  • D. Einfeld
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  The Iranian Light Source Facility Project (ILSF) is a 3rd generation light source with an energy of 3 GeV,a full energy injector and a 100 MeV linac as preinjector. For storage ring, booster synchrotron and linac including the transfer lines, a draft design has been completed and will be presented. The storage ring has an emittance of 3.3 nm-rad, a circumference of 297.6 meters with an overall of 32 straight sections of different lengths. The booster synchrotron has a circumference of 197 meters and emittance of 35nm-rad. For the booster synchrotron a new lattice is proposed. The linac is a conventional 150 MeV accelerator. The different accelerator components, magnets, girders, power supplies, vacuum systems etc. are in the design phase. State of the art design for different components is employed through international collaboration.  
 
TUPPC040 Model Calibration and Optics Correction Using Orbit Response Matrix in the Fermilab Booster optics, dipole, acceleration, coupling 1251
 
  • M.J. McAteer, S.E. Kopp
    The University of Texas at Austin, Austin, Texas, USA
  • V.A. Lebedev, E. Prebys
    Fermilab, Batavia, USA
  • A.V. Petrenko
    BINP SB RAS, Novosibirsk, Russia
  
  A beam-based method of optical model calibration using the measured orbit response matrix, known as the LOCO method, was successfully applied to Fermilab's rapid-cycling Booster synchrotron. Orbit responses were measured by individually changing the strength of each dipole corrector throughout the acceleration cycle, and dispersion was measured by changing the beam's radial offset. The model calibration procedure revealed large calibration errors for all elements in the Booster's recently-installed multipole corrector packages and beam position monitors. The resulting model was used to correct coupling and beta beating.  
 
TUPPC072 Modeling of Matching Channel for Accelerator Complexes controls, lattice, quadrupole, dipole 1338
 
  • E.A. Podzyvalov, S.N. Andrianov
    St. Petersburg State University, St. Petersburg, Russia
  • D. Zyuzin
    FZJ, Jülich, Germany
  
  Practically modern accelerator facility can be considered as a composite machines. Therefore it is necessary to consider special matching channels to joint all accelerator components together. For such channels advance various requirements, which can be formulated in the form of criteria sets. In this paper considered a global optimization concept allows to find appropriate solutions sets. This approach is demonstrated on the problem of modeling the matching channels for NICA accelerator complex.  
 
TUPPD019 New Injector for the EMMA ns-FFAG Ring cavity, gun, linac, emittance 1449
 
  • B.D. Muratori
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  EMMA is the world’s first non-scaling FFAG which has recently demonstrated acceleration in the serpentine channel. At present, the electron beam is injected into EMMA from the ALICE accelerator. However, funding will be re-directed to an Electron Beam Test Facility (EBTF) in the near future, therefore, in order to continue the broad portfolio of planned experiments required to characterize non-scaling FFAGs, it essential to consider an alternative injection scheme. In this paper, we propose re-utilizing a thermionic gun and a 12 MeV linac from the SRS (Synchrotron Radiation Source) at Daresbury Laboratory. The paper looks at how the required EMMA beam properties can be matched with this new set-up and the advantages and disadvantages involved.  
 
TUPPD077 SPEAR3 Booster RF System Upgrade: Performance Requirements and Evaluation of Resources klystron, cavity, injection, linac 1578
 
  • S. Park, W.J. Corbett, R.O. Hettel, J.F. Schmerge, J.J. Sebek, J.W. Wang
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by U.S. Department of Energy Contract DE-AC03-76SF00515 and Office of Basic Energy Sciences, Division of Chemical Sciences.
The SPEAR2 accelerator system originally had 3 RF stations (2 for storage ring, 1 Booster) operating at 358.5 MHz. SPEAR3 now operates at 476.3 MHz with PEP-II type RF system, while the Booster RF frequency remains unchanged. For top-off operation, the Booster injects single 3.0 GeV electron bunches into SPEAR3 at 10 Hz every 5 minutes to replenish lost charge. Due to the frequency mismatch between SPEAR3 and the Booster, only one SPEAR3 bucket can injected per shot limiting injection rate and overall system flexibility. The aging high-power RF subsystems of the Booster pose a reliability issue as well. In order to remove these constraints, studies are underway to replace the Booster RF system using the PEP-II type RF system as a baseline. The new Booster RF system will be tuned to 475.036 MHz, and phase-locked to the SPEAR3 RF system. The project calls for ramping the Booster cavity gap voltage to 0.80 MV at 10 Hz, each with a 40 ms acceleration interval. With very low beam loading and low average RF power, there are many subsystems that can be operationally simplified. In this paper we present the results of analysis leading to a new Booster RF system. 		 
 
TUPPP021 Orbit Stability at ALBA insertion, insertion-device, wiggler, undulator 1653
 
  • M. Muñoz, G. Benedetti, D. Einfeld, J. Marcos, Z. Martí
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  The synchrotron light source ALBA is in the final stage of the Storage Ring commissioning, with the beamline commissioning well under way. In the month of beam line commissioning, the storage ring has provided an stable beam, with horizontal and vertical stabilities better than the micrometer in both planes in DC and a good reproducibility of the beam position day by day. In this paper we review the performance of the Slow Orbit Feedback, the changes in orbit due to insertion devices, as well as the first measurement using the 10 kHz sampling mode of the Libera BPMs, together with the status of the implementation of the Fast Orbit Feedback system.  
 
TUPPP026 RF Rescue Option for TPS Linac electron, linac, bunching, injection 1668
 
  • K.L. Tsai, H.-P. Chang, C.-T. Chen, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.-K. Lin, H.M. Shih
    NSRRC, Hsinchu, Taiwan
  • K. Dunkel, C. Piel
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  
  The 150 MeV linac of Taiwan Photon Source was commissioned in June 2011. It consists of 90 keV electron source, bunching system and three S-band accelerating sections driven by three high-power klystrons. The rf system is equipped with rescue option such that the rf power from second klystron can be split and fed into both accelerating section 1 and 2. The rescue operation will be needed in the event of a failure occurred at the first klystron. In the report, the rescue capability will be illustrated and the test results will also be discussed.  
 
TUPPP064 Microbunching Instability Studies in SwissFEL simulation, laser, FEL, linac 1744
 
  • S. Bettoni, B. Beutner
    Paul Scherrer Institut, Villigen, Switzerland
  • V.A. Goryashko
    NASU/IRE, Kharkov, Ukraine
  
  Shot noise or an initial intensity modulation in the beam pulse may have a strong effect in the FEL linacs and also severely degrade the machine performances in terms of FEL performances. In this paper we present the simulations done to study this effect in SwissFEL, the future free electron laser under design at Paul Scherrer Institute. In particular we calculated the gain of the microbunching instability in the low and high energy part and we performed start-to-end simulations using as initial distribution something as close as possible to the laser profile measured at the SwissFEL injector test facility. We finally present the preliminary calculations to estimate the effect of the laser heater to mitigate this effect.  
 
TUPPR053 Conceptual Design of the Linac4 Main Dump linac, simulation, proton, radiation 1939
 
  • I.V. Leitao, C. Maglioni, A. Sarrió Martínez
    CERN, Geneva, Switzerland
  
  Linac4 is the new CERN linear accelerator intended to replace the aging Linac2 as the injector to the Proton Synchrotron Booster (PSB) for increasing the luminosity of the Large Hadrons Collider (LHC). By delivering a 160MeV H− beam, Linac4 will provide the necessary conditions to double the brightness and intensity of the beam extracted from the PSB. This paper describes the conceptual design of the Linac4 Main Dump, where two different concepts relying respectively on water and air cooling were compared and evaluated. Based on the application of analytical models for the energy deposited by the beam, heat conduction and cooling concepts, a parametric study was performed. This approach allowed the identification of the “optimal” configuration for these two conceptual geometries and their relative comparison. Besides giving the theoretical guidelines for the design of the new dump, this work also contributes to the development of analytical tools to allow a better understanding of the influence of the several design parameters in this type of low-energy beam intercepting devices.  
 
TUPPR054 Internal H0/H− Dump for the Proton Synchrotron Booster Injection at CERN vacuum, linac, radiation, injection 1942
 
  • M. Delonca, C. Maglioni, A.A. Patapenka, A. Sarrió Martínez
    CERN, Geneva, Switzerland
  
  In the frame of the LHC Injectors Upgrade Project at CERN (LIU), the new 160MeV H− Linac4 will inject into the four existing PS Booster rings after the conversion of H− into H+ in a stripping foil. Given a limited stripping efficiency and possible foil failures, a certain percentage of the beam is foreseen to remain partially (H0) or completely (H−) unstripped. An internal dump installed into the chicane magnet to stop these unstripped beams is therefore required. This paper presents the conceptual design of the internal dump, reviewing loading assumptions, design constraints, limitations and integration studies. Power evacuation through the thermal contact between the core and the external active cooling is addressed and, finally, results from the numerical thermo-mechanical analyses are reported.  
 
TUPPR055 Upgrading the CEBAF Injector with a New Booster, Higher Voltage Gun, and Higher Final Energy gun, cryomodule, coupling, cavity 1945
 
  • R. Kazimi, A. Freyberger, F.E. Hannon, A.S. Hofler, A. Hutton
    JLAB, Newport News, Virginia, USA
  
  Funding: Authored by JSA, LLC under U.S. DOE Contract DE-AC05- 06OR23177. The U.S. Govt. retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this for U.S. Govt. purposes.
The CEBAF accelerator at Jefferson Lab will be upgraded from 6 GeV to 12 GeV in the next few years. To meet the requirement of the new machine and also to take the opportunity to improve the beam quality, the CEBAF injector will be upgraded with a higher voltage gun, a new booster, and a new accelerating RF module. The CEBAF injector creates and accelerates three beams at different currents simultaneously. The beams are interleaved, each at one third of RF frequency, traveling through the same beam line. The higher voltage gun will lower the space charge effects making it easier to operate at different current with the same setup. The new booster with optimized beam dynamics will complete the bunching process and provides initial acceleration matched to the new gun voltage. Using our latest SRF design, the new booster has significantly lower XY coupling effects that should improve our beam setup and operation for the highly sensitive parity experiments scheduled for the CEBAF’s future. Finally, the new accelerating RF module will roughly double the injector final energy to match the rest of the 12 GeV accelerator. In this paper we will provide more detail about this upgrade. 		 
 
TUPPR082 MEIC Design Progress ion, electron, collider, polarization 2014
 
  • Y. Zhang, Y.S. Derbenev, D. Douglas, A. Hutton, G.A. Krafft, R. Li, F. Lin, V.S. Morozov, E.W. Nissen, F.C. Pilat, T. Satogata, C. Tennant, B. Terzić, B.C. Yunn
    JLAB, Newport News, Virginia, USA
  • D.P. Barber
    DESY, Hamburg, Germany
  • Y. Filatov
    JINR, Dubna, Russia
  • C. Hyde
    Old Dominion University, Norfolk, Virginia, USA
  • A.M. Kondratenko
    Science and Technique Laboratory Zaryad, Novosibirsk, Russia
  • S.L. Manikonda, P.N. Ostroumov
    ANL, Argonne, USA
  • M.K. Sullivan
    SLAC, Menlo Park, California, USA
  
  Funding: Supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177 and No. DE-AC02-06CH11357.
This paper will report the recent progress in the conceptual design of MEIC, a high luminosity medium energy polarized ring-ring electron-ion collider at Jefferson lab. The topics and achievements that will be covered are design of the ion large booster and the ERL-circulator-ring-based electron cooling facility, optimization of chromatic corrections and dynamic aperture studies, schemes and tracking simulations of lepton and ion polarization in the figure-8 collider ring, and the beam-beam and electron cooling simulations. A proposal of a test facility for the MEIC electron cooler will also be discussed. 		 
 
TUPPR086 Transport from the Recycler Ring to the Antiproton Source Beamlines proton, kicker, antiproton, extraction 2026
 
  • M. Xiao
    Fermilab, Batavia, USA
  
  In the post-Nova era, the protons are directly transported from the Booster ring to the Recycler ring rather than the Main Injector. For Mu2e and g-2 project, the Debuncher ring will be modified into a Delivery ring to deliver the protons to both Mu2e and g-2 experiemnts. Therefore, It requires the transport of protons from the Recycler Ring to the Delivery ring. A new transfer line from the Recycler ring to the P1 beamline will be constructed to transport proton beam from the Recycler Ring to existing Antiproton Source beamlines. This new beamline provides a way to deliver 8 GeV kinetic energy protons from the Booster to the Delivery ring, via the Recycler, using existing beam transport lines, and without the need for new civil construction. This paper presents the Conceptual Design of this new beamline.  
 
WEPPD020 Vacuum System for TPS Booster vacuum, lattice, ion, electron 2540
 
  • C.M. Cheng, C.K. Chan, C.L. Chen, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh
    NSRRC, Hsinchu, Taiwan
  
  The TPS booster is designed for lower beam emittance and 3GeV full energy injection ramped up from 150MeV. It is a synchrotron accelerator of 496.8m in circumference and located concentric with the electron storage ring in the same tunnel. The vacuum system for the booster is divided into six super periods and each has nine bending magnet chambers. The beam duct is made of thin stainless steel tube extruded to the elliptical cross section with inner diameters of 35 mm×20 mm and thickness of 0.7 mm. All the chambers will be supported on the inner wall of the tunnel. The straightness of the extruded thin chambers is controlled within 2.5 mm in 4 m length. The bending chamber is made by mechanical bending from the straight tube. All the beam ducts will be chemical cleaned prior to welding, with flanges or BPM chambers, to form the long chambers in the clean room before installation. The arrangement of vacuum pumps are distributed to fulfill an average pressure of ＜1×10-6 Pa. The detailed design and the construction status will be described in the paper.  
 
WEPPD039 Status of the Utility System Construction for the 3 GeV TPS Storage Ring storage-ring, status, controls, power-supply 2597
 
  • J.-C. Chang, W.S. Chan, J.-R. Chen, Y.F. Chiu, Y.-C. Chung, K.C. Kuo, Y.-C. Lin, C.Y. Liu, I. Liu, Z.-D. Tsai, T.-S. Ueng
    NSRRC, Hsinchu, Taiwan
  
  The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) was started in the end of 2009. The utility building for the TPS ring will be completed in the end of 2011. The whole construction of the utility system is scheduled to be completed in the end of 2012. Total budget of this construction is about four million dollars. This utility system presented in this paper includes the electrical power, cooling water, air conditioning, compressed air and fire control systems.  
 
WEPPD047 Sequencer Design of Timing System for the Taiwan Photon Source injection, controls, gun, EPICS 2621
 
  • C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  The timing system of the Taiwan Photon Source is used to distribute trigger signals and synchronously clocks to all the equipment of the machine which need them. The timing system basically works by sending event codes from one event generator (EVG) through tree structured, bidirectional optical fiber network to many event receivers. To accommodate various operation and injection scenarios of the TPS storage ring and booster synchrotron and LINAC, timing sequencer design and control is crucial. The sequencer (event code) is stored at sequence RAM of the EVG module. In order to manage sequence RAM of EVG, the timing sequence control is considered to use Matlab scripts embedded in the timing master EPICS IOC. The timing sequencer design will be summarized in this paper.  
 
WEPPD079 Measurements of Magnetic Permeability of Soft Steel at High Frequencies impedance, dipole, vacuum, damping 2711
 
  • Y. Tokpanov, V.A. Lebedev, W. Pellico
    Fermilab, Batavia, USA
  
  The Fermilab Booster does not have a vacuum chamber which would screen the beam from laminations its dipoles cores. Therefore the booster impedance is mainly driven by the impedance of these dipoles. Recently an analytical model of the laminated dipole impedances was developed. However to match the impedance measurements with calculations one needs an accurate measurement of soft steel magnetic permeability. This paper presents the measurement results of the permeability in a frequency range from ~10 MHz to 1 GHz. Measurements of e.-m. wave propagation in 30 cm long strip line built from soft steel were used to compute the permeability. Measurements were performed in a DC magnetic field to observe the effect of steel saturation on the high frequency permeability. Both real and imaginary parts of the permeability were measured. As expected their values were decreasing with frequency increase from 10 MHz to 1 GHz and with saturation of steel DC permeability.
Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. 		 
 
WEPPR085 Observation of Instabilities of Coherent Transverse Ocillations in the Fermilab Booster coupling, damping, injection, space-charge 3129
 
  • Y. Alexahin, N. Eddy, E. Gianfelice-Wendt, V.A. Lebedev, W.L. Marsh, W. Pellico, A.K. Triplett
    Fermilab, Batavia, USA
  
  Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
The Fermilab Booster - built more than 40 years ago - operates well above the design proton beam intensity of 4.e12 ppp. Still, the Fermilab neutrino experiments call for even higher intensity of 5.5·1012 ppp. A multitude of intensity related effects must be overcome in order to meet this goal including suppression of coherent dipole instabilities of transverse oscillations which manifest themselves as a sudden drop in the beam current. In this report we present the results of observation of these instabilities at different tune, coupling and chromaticity settings and discuss possible cures. 		 
 
THPPC030 Multi-physics Analysis of the Fermilab Booster RF Cavity cavity, proton, injection, extraction 3347
 
  • M.H. Awida, M.S. Champion, T.N. Khabiboulline, V.A. Lebedev, J. Reid, V.P. Yakovlev
    Fermilab, Batavia, USA
  
  Funding: Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the U.S. DOE
After about 40 years of operation the RF accelerating cavities in Fermilab Booster need an upgrade to improve their reliability and to increase the repetition rate in order to support a future experimental program. An increase in the repetition rate from 7 to 15 Hz entails increasing the power dissipation in the RF cavities, their ferrite loaded tuners, and HOM dampers. The increased duty factor requires careful modelling for the RF heating effects in the cavity. A multi-physic analysis investigating both the RF and thermal properties of Booster cavity under various operating conditions is presented in this paper. 		 
 
THPPC052 Commissioning and One Year Operation of the 50 kW Solid State Amplifiers of the LNLS Storage Ring RF System storage-ring, klystron, controls, synchrotron 3404
 
  • R.H.A. Farias, J.F.F. Ferrari, C. Pardine, F. Santiago de Oliveira
    LNLS, Campinas, Brazil
  
  In December 2010 a pair of high power solid state amplifiers was installed in the RF system of the LNLS electron storage ring. The new amplifiers replaced the UHF klystron system that had been in operation since the machine started operating in 1996. LNLS has been working on solid state amplifiers for more than 10 years since it started a close collaboration with LURE back in 1999 to build an amplifier to drive the booster RF system. From this ongoing collaboration with SOLEIL resulted the design and construction of these two new high power amplifiers, capable of delivering up to 50 kW each at the operating frequency of 476 MHz. Before installation the amplifiers were commissioned in the RF laboratory. We present an overview of the results of those tests as well as a performance evaluation after one year operation of the amplifiers in the storage ring.  
 
THPPD014 Design and Performance of Various kinds of Corrector Magnets for the Taiwan Photon Source feedback, vacuum, simulation, power-supply 3524
 
  • C.Y. Kuo, C.-H. Chang, M.-H. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin
    NSRRC, Hsinchu, Taiwan
  
  Three types of DC corrector magnets will be installed in the booster ring (BR), LINAC to booster (LTB) and booster to storage ring (BTS) in the Taiwan photon source (TPS). These DC corrector magnets have different gap sizes, iron lengths and field strengths for different bending angles to optimize the electron beam. The DC magnetic fields are simulated by TOSCA 2D/3D static field analysis and optimum processes are discussed. An AC steering fast feedback corrector (FFC) combines horizontal and vertical dipole fields for the fast feedback correction in the storage ring (SR). The field variation with the alternating current in the 300Hz frequency of the FFC magnet is simulated by the Opera 3d ELEKTRA/SS analysis module to estimate the operating current. This paper will be presented about features, design concept and results of field measurement of these corrector magnets.
NSRRC, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan 		 
 
THPPD067 Performance of Kicker Pulsers for TPS Project kicker, injection, power-supply, storage-ring 3665
 
  • C.-S. Fann, C.-T. Chen, K.T. Hsu, S.Y. Hsu, J.C. Huang, K.-K. Lin, K.-B. Liu, H.M. Shih, K.L. Tsai
    NSRRC, Hsinchu, Taiwan
  
  A set of kicker power suppliers has been designed and fabricated for storage ring beam injection of the Taiwan Photon Source (TPS) project. In order to fulfill the requirements, the performance of the designed units has been bench tested and the results are examined. The matching in four pulsers, the pulse-to-pulse stability and the time jitter are specified according to the beam injection requirements. The engineering evaluation and the measurement results are briefly discussed.  
 
THPPD074 Effect of a Metallized Chamber upon the Field Response of a Kicker Magnet: Simulation Results and Analytical Calculations kicker, simulation, vacuum, ion 3686
 
  • M.J. Barnes, M.G. Atanasov, T. Fowler, T. Kramer, T. Stadlbauer
    CERN, Geneva, Switzerland
  
  Metallized racetrack vacuum chambers will be used in the pulsed magnets of the Austrian cancer therapy and research facility, MedAustron. It is important that the metallization does not unduly degrade field rise and fall times or the flattop of the field pulse in the pulsed magnets. This was of particular concern for a tune kicker magnet, which has a specified rise and fall time of 100 ns. The impact of the metallization, upon the transient field response, has been determined by finite element method (FEM) simulations: the dependency of the field response to the metallization thickness and resistivity are presented. Formulae for the field response, which permit the use of a ramped transient excitation current, are presented: thus the coating thickness and resistivity can be determined which result in a maximum permissible field attenuation and delay for a given current rise time. In addition, results of simulations of the effect of a magnetic brazing collar, located between the ceramic vacuum chamber and flange, are reported.  
 
THPPP011 Studies on a Wideband, Solid-state Driven RF System for the CERN PS Booster impedance, feedback, cavity, acceleration 3749
 
  • M.M. Paoluzzi, L. Arnaudon, N. Chritin, M. Haase, K. Hanke, B. Mikulec, T. Tardy
    CERN, Geneva, Switzerland
  
  In the framework of the LHC Injectors Upgrade project (LIU) the PS Booster (PSB) RF systems will undergo in depth consolidation and upgrade programs. The aim is increasing the extraction energy to 2 GeV and allowing reliable operations during next 25 years. Substantial improvements could come from the replacement of the existing narrowband, tuned systems covering the h=1 and h=2 frequency ranges (0.6 / 1.8 MHz and 1.2 / 3.6 MHz respectively) with wideband (0.5 / 4 MHz) Finemet® loaded cavities. The new system would be modular, allow multi-harmonic operation, use solid-state power stages and include fast RF feedback to compensate beam loading effects to some extent. A prove of principle system providing ≈3.0 kV accelerating voltage has been designed, constructed and installed in one of the PSB rings. This paper provides details on the design and measurements as well as information on the project status.  
 
THPPP016 Upgrade Strategies for the Proton Synchrotron Booster Dump at CERN proton, extraction, cavity, synchrotron 3761
 
  • A. Sarrió Martínez, F. Loprete, C. Maglioni
    CERN, Geneva, Switzerland
  
  CERN’s LHC Injection chain Upgrade (LIU) involves a revision of the Proton Synchrotron Booster dump, which was designed in the 1960’s to cope with beam energies reaching 800 MeV and intensities of 10+13 particles per pulse. Thermo-mechanical studies highlighted the need for an upgrade of the dump, so that it is capable of withstanding energies in the order of 2 GeV and intensities up to 10+14 particles per pulse. This paper proposes a new design of the dump in the light of various constraints and choices such as the geometry, materials and the integration of the required cooling system. Further topics discussed include the strategy for dismantling the old device, which has been continuously irradiated for almost 40 years and presents a difficult access. Therefore, a detailed ALARA procedure is being prepared in order to carry out the upgrade works in the area.  
 
THPPP019 Tune Determination of Strongly Coupled Betatron Oscillations in a Fast Ramping Synchrotron coupling, damping, betatron, quadrupole 3770
 
  • Y. Alexahin, E. Gianfelice-Wendt, W.L. Marsh, A.K. Triplett
    Fermilab, Batavia, USA
  
  Funding: Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Tune identification - i.e. attribution of the spectral peak to a particular normal mode of oscillations - can present a significant difficulty in the presence of strong transverse coupling when the normal mode with a lower damping rate dominates spectra of Turn-by-Turn oscillations in both planes. The introduced earlier phased sum algorithm* helped to recover the weaker normal mode signal from the noise, but by itself proved to be insufficient for automatic peak identification in the case of close phase advance distribution in both planes. To resolve this difficulty we modified the algorithm by taking and analyzing Turn-by-Turn data for two different ramps with the beam oscillation excited in each plane in turn. Comparison of the relative amplitudes of Fourier components allows for automatic correct tune identification. The proposed algorithm was implemented in the Fermilab Booster B38 console application and successfully used in tune, coupling and chromaticity measurements.
* Y. Alexahin, E. Gianfelice-Wendt, W. Marsh, Proc. IPAC10, Kyoto, May 2010, p. 1179. 		 
 
THPPP021 6 Batch Injection and Slipped Beam Tune Measurements in Fermilab’s Main Injector injection, proton, coupling, target 3776
 
  • D.J. Scott, D. Capista, I. Kourbanis, K. Seiya, M.-J. Yang
    Fermilab, Batavia, USA
  
  During Nova operations it is planned to run the Fermilab Recycler in a 12 batch slip stacking mode. In preparation for this, measurements of the tune during a six batch injection and then as the beam is slipped by changing the RF frequency, but without a 7th injection, have been carried out in the Main Injector. The coherent tune shifts due to the changing beam intensity were measured and compared well with the theoretically expected tune shift. The tune shifts due to changing RF frequency, required for slip stacking, also compare well with the linear theory, although some nonlinear affects are apparent at large frequency changes. These results give us confidence that the expected tunes shifts during 12 batch slip stacking Recycler operations can be accommodated.  
 
THPPP023 Momentum Cogging at the Fermilab Booster dipole, injection, controls, extraction 3782
 
  • K. Seiya, C.C. Drennan, W. Pellico, A.K. Triplett, A.M. Waller
    Fermilab, Batavia, USA
  
  The Fermilab booster has an intensity upgrade plan called the Proton Improvement plan (PIP). The flux throughput goal is 2·1017 protons/hour which is almost double the current operation at 1.1017 protons/hour. The beam loss in the machine is going to be an issue. The booster accelerates beam from 400 MeV to 8GeV and extracts to The Main Injector (MI). Cogging is the process that synchronizes the extraction kicker gap to the MI by changing radial position of the beam during the cycle. The gap creation occurs at about 700MeV which is 6msec into the cycle. The variation of the revolution frequency from cycle to cycle is larger at lower energy and it is hard to control by changing the radial position because of aperture limitations. Momentum cogging is able to move the gap creation earlier by using dipole correctors and radial position feedback, and controlling the revolution frequency and radial position at the same time. The new cogging is going to save energy loss and aperture. The progress of the momentum cogging system development is going to be discussed in this paper.  
 
THPPP024 Alignment and Aperture Scan at the Fermilab Booster injection, alignment, proton, lattice 3785
 
  • K. Seiya, J.R. Lackey, W.L. Marsh, W. Pellico, D.A. Still, A.K. Triplett, A.M. Waller
    Fermilab, Batavia, USA
  
  The Fermilab booster has an intensity upgrade plan called the Proton Improvement plan (PIP). The flux throughput goal is 2·1017 protons/hour, which is almost double the current operation at 1.1017 protons/hour. The beam loss in the machine is going to be the source of issues. The booster accelerates beam from 400 MeV to 8 GeV and extracts to the Main Injector. Several percent of the beam is lost within 3 msec after the injection. The aperture at injection energy was measured and compared with the survey data. The magnets are going to be realigned in March 2012 in order to increase the aperture. The beam studies, analysis of the scan and alignment data, and the result of the magnet moves will be discussed in this paper.  
 
THPPP027 The Design of a Large Booster Ring for the Medium Energy Electron-Ion Collider at JLab ion, collider, dipole, electron 3791
 
  • E.W. Nissen, T. Satogata, Y. Zhang
    JLAB, Newport News, Virginia, USA
  
  Funding: Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
In this paper, we present the current design of the large booster ring for the Medium Energy Electron-Ion Collder (MEIC) at JLab. The booster ring takes 3 GeV protons or ions of equivalent energy from a pre-booster ring, and accelerates them to 20 GeV for protons or equivalent energy for light to heavy ions before sending them to the ion collider ring. The present design calls for a figure-8 shape of the ring for superior preservation of ion polarization. The ring is made of warm magnets and shares a tunnel with the two collider rings. Acceleration is achieved by warm RF systems. A linear optics has been designed with the transition energy above the highest beam energy in the ring so crossing of transition energy will be avoided. Preliminary beam dynamics studies including chromaticity compensation, analyses of dynamic aperture, working point and high order effects are also presented in this paper. 		 
 
THPPR009 Optimization of the Electron Beam Extraction Efficiency in a Booster for TLS extraction, electron, factory, kicker 3981
 
  • H.C. Chen, H.-P. Chang, H.H. Chen, S. Fann, S.J. Huang, J.A. Li, C.C. Liang, Y.K. Lin, Y.-C. Liu
    NSRRC, Hsinchu, Taiwan
  
  The Response Surface Methodology (RSM), is used to study the optimization process of the electron beam extraction efficiency for Taiwan Light Source (TLS) in NSRRC. A study model was constructed based on the Artificial Neural Network (ANN) theory by using selected beam extraction tuning knobs as the variables. An optimization procedure is developed by taking extraction efficiency as the objective function and the selected beam tuning knobs as the variables. Furthermore, this theoretical model and optimization procedure have been put into practice in verifying how effectively the model can accomplish. By properly applying the constructed optimization procedure for electron beam extraction study, the efficiency has been improved effectively. The details of the study will be reported in this paper.  
 
THPPR034 Safety Interlock Implementation of Top-up Operation in the SSRF Control System controls, injection, storage-ring, linac 4044
 
  • L.R. Shen, G.H. Chen, J.F. Chen, W.D. Fang
    SINAP, Shanghai, People's Republic of China
  
  The SSRF has performed two years stable operation on decay mode. In order to realize the Top-up operation, the upgrade of control system has been carried out for Top-up trial run. Control system sets up the operation mode control center and accomplishes the upgrading of the MPS system. According to the requirements of the physical design, control system accomplished the design and implementation of the interface for interoperate with PPS system, beam diagnosis system and power supply system and set up the interlocks of the radiation dose, energy, injection efficiency, beam current and beam life in Top-up mode. The kernel of top-up operation safety interlock system is based on hardware interlock system and also provides software interlocking as auxiliary. In the meantime, the reliability of software interlock has been improved.  
 
FRYBP01 Accelerators for Intensity Frontier Research proton, target, linac, kaon 4185
 
  • P. Derwent
    Fermilab, Batavia, USA
  
  This presentation should present recent developments in the accelerator physics and technology supporting the intensity frontier research in high energy physics. It should discuss the long and short base line neutrino experiments and the experiments with muons (muon-to-electron conversion and g-2).  
slides icon Slides FRYBP01 [3.908 MB]