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| TUPMR035 | HEBT Commissioning for Horizontal Beamline Proton Treatments at MedaAustron | 1324 |
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| MedAustron has completed its proton commissioning activities for clinical treatment in the horizontal Irradiation Room 3 (IR3). Work involved the preparation of 255 energies in clinical range (60 - 250 MeV) for one spill length, one spot size and 4 intensity levels. After resonant slow extraction, the beam crosses four different functional areas in the High Energy Beam Transfer Line (HEBT): the dispersion suppressor (DS), the phase shifter stepper (PSS), two straight extension modules and a deflection module to IR3. Quadrupole-variation methods were applied to center the beam in the beamline. The DS section was commissioned to provide high intensity beams with closed dispersion. The PSS section was commissioned to provide symmetric and minimal spot sizes at the iso-center in the room (after scattering in the nozzle and air). The definition of the 255 clinical energies was given by the Medical Physics team after measuring the beam ranges at the iso-center. | ||
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| TUPMR036 | Extraction Commissioning for MedAustron Proton Operation | 1327 |
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| MedAustron is a synchrotron based ion beam therapy center for proton (62-250 MeV) and carbon ion (120-400 MeV/n) treatments. The MedAustron synchrotron uses a betatron core driven slow extraction scheme based on a third order resonance. The commissioning of the extraction from the synchrotron involved the setup of the correct orbit and optics at flattop. In order to maximize the momentum spread before extraction and optimize spill structure the RF system enforces a so called RF-phase jump to the unstable phase. Different scenarios were simulated using MADX-PTC [1] in combination with Python to overcome the static nature of PTC. Simulations have shown that the initial phase of the beam and a finite time to jump to the unstable fix point have a strong impact on the performance. Using a high frequency intensity monitor in the extraction channel (QIM), the spill structure was analysed and used for optimization. Simulation and measurements of the procedure are presented. | ||
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| TUPMR037 | Betatron Core Driven Slow Extraction at CNAO and MedAustron | 1330 |
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| The Italian Centre for Hadrontherapy (CNAO) and the MedAustron Hadrontherapy Center in Austria are synchrotron-based medical therapy centers. The CNAO machine has five years of experience in patient treatments, whereas MedAustron will soon start patient treatments with protons. Their accelerator systems have common characteristics, in particular in regards to the extraction system: at acceleration flattop, particles are slowly driven through the third integer resonance longitudinally by a betatron core. This setup enables smooth extracted beam intensities. The rationale behind the use of a betatron core, its impact on the extracted beam quality and the performance from operation and commissioning of the two centers will be here presented. | ||
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| TUPMR039 | The Development of a New High Field Injection Septum Magnet System for Main Ring of J-Parc | 1337 |
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| We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam power. It is necessary to exchange a high field injection septum magnet which will be installed at the injection line from RCS to MR and its power supply, because the current injection septum system can not be operated with 1.3 second repetition. Since confirmed the large leakage field around current circling beam line of the injection magnet, we must improve the shielding structure which make low leakage field. We started the development of the new injection septum magnet and its power supply in 2013. It can operate with 1 Hz repetition and the low leakage field which its order is 10-4 of the gap field. The new Injection septum magnet and the new power supply were constructed in Winter of 2014. We had many improvement of the magnet and power supply. We will install the new injection septum magnet system in this summer. In this presentation, we will report the detail of the results of its performance. | ||
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| TUPMR040 | The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC | 1340 |
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| The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems. | ||
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| TUPMR041 | Design of the Low Energy Beam Transport Line for Xi‘an Proton Application Facility | 1343 |
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| Xi‘an Proton Application Facility (XiPAF) is a new proton project which is being constructed for single-event-effect experiments. It can provide proton beam with the maximum energy of 200 MeV. The accelerator facility of XiPAF mainly contains a 7 MeV H− linac injector and a proton synchrotron accelerator. The 7 MeV H− linac injector is composed of an ECR ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole accelerator (RFQ) and a Drift Tube Linac (DTL). The 50 keV 10 mA H− beam (pulse width 1ms) extracted from the ion source is expected to be symmetric with the Twiss parameters alpha=0 and β=0.065 mm/mrad. The RMS normalized emittance is required to be less than 0.2 π mm·mrad. With an adjustable collimator and an electric chopper in the 1.7 m-long LEBT, the beam pulse width of 10~40μs and peak current of 6 mA can be obtained. The H− beam is matched into the downstream RFQ accelerator with alpha=1.051 and β=0.0494 mm/mrad. This paper shows the detailed design process of the LEBT and simulation result with the TRACEWIN code. | ||
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| TUPMR042 | Transverse Profile Expansion and Homogenization for the Beamline of XIPAF | 1346 |
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| For the Xi'an 200 MeV Proton Application Facility (XiPAF), one important thing is to produce more homog-enous beam profile at the target to fulfill the requirements of the beam application. Here the beam line is designed to meet the requirement of beam expansion and homogenization, and the step-like field magnets are employed for the beam spot homogenization. The simulations results including space charge effects and errors show that the beam line can meet the requirements well at the different energies (from 10 MeV to 230 MeV) and different beam spot size (from 20mm to 200mm). | ||
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| TUPMR044 | Beam Test of the New Beamline for Radio-Isotope Production at KOMAC | 1349 |
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Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning). A high power proton linac is under operation at Korea multi-purpose accelerator complex (KOMAC). Currently, two beamlines are available and used to provide 20-MeV beam and 100-MeV beam to users from various fields. An additional 100-MeV beamline has been constructed mainly for production of radio-isotopes such as Sr-82 and Cu-67. Proton beam with the beam energy of 100 MeV and the average current of 0.6 mA is directed to the production target, which is located in a water-filled target chamber, through a beam window made of AlBeMet. The beam size at the target is designed to be about 100 mm in diameter. Installation of the beamline components including 1.5 T bending magnet and the beam diagnostic devices such as BPM and BCM is finished and beam commissioning is planned to start in early 2016. The details of newly-constructed beamline and the initial beam test results will be given in this paper. |
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| TUPMR046 | Sources of Emittance Growth at the CERN PS Booster to PS Transfer | 1352 |
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| The CERN PS Booster (PSB) has four vertically stacked rings. After extraction from each ring, the bunches are recombined in two stages, comprising septum and kicker systems, such that the accumulated bunch train is injected through a single line into the PS. Bunches from the four rings go through a different number of vertical bends, which leads to differences in the betatron and dispersion functions due to edge focussing. The fast pulsed systems at PSB extraction, recombination and PS injection lead to systematic errors of delivery precision at the injection point. These error sources are quantified in terms of emittance growth and particle loss. Mitigations to reduce the overall emittance growth at the PSB to PS transfer within the LHC injectors upgrade are presented. | ||
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| TUPMR048 | SPS Injection and Beam Quality for LHC Heavy Ions With 150 ns Kicker Rise Time | 1360 |
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| As part of the LHC Injectors Upgrade project for LHC heavy ions, the SPS injection kicker system rise time needs reduction below its present 225 ns. One technically challenging option under consideration is the addition of fast Pulse Forming Lines in parallel to the existing Pulse Forming Networks for the 12 kicker magnets MKP-S, targeting a system field rise time of 100 ns. An alternative option is to optimise the system to approach the existing individual magnet field rise time (2-98%) of 150 ns. This would still significantly increase the number of colliding bunches in LHC while minimising the cost and effort of the system upgrade. The observed characteristics of the present system are described, compared to the expected system rise time, together with results of simulations and measurements with 175 and 150 ns injection batch spacing. The expected beam quality at injection into LHC is quantified, with the emittance growth and simulated tail population taking into account expected jitter and synchronisation errors, damper performance and SPS non-linear optics behavior. The outlook for deployment is discussed, with the implications for LHC operation and HL-LHC performance. | ||
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| TUPMR049 | Feasibility Study of the PS Injection for 2 GeV LIU Beams with an Upgraded KFA-45 Injection Kicker System Operating in Short Circuit Mode | 1363 |
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| Under the scope of the LIU project the CERN PS Booster to PS beam transfer will be modified to match the requirements for the future 2 GeV beams. This paper describes the evaluation of the proposed upgrade of the PS injection kicker. Different schemes of an injection for LIU beams into the PS have been outlined in the past already under the aspect of individual transfer kicker rise and fall time performances. Homogeneous rise and fall time requirements in the whole PSB to PS transfer chain have been established which allowed to consider an upgrade option of the present injection kicker system operated in short circuit mode. The challenging pulse quality constraints require an improvement of the flat top and post pulse ripples. Both operation modes, terminated and short circuit mode are analysed and analogue circuit simulations for the present and upgraded system are outlined. Recent measurements on the installed kickers are presented and analysed together with the simulation data. First measurements verifying the performance of upgrade options have been taken during the last end of the year stop. The paper concludes with an upgrade plan and a brief overview of implementation risks. | ||
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| TUPMR050 | Upgrades to the SPS-to-LHC Transfer Line Beam Stoppers for the LHC High-Luminosity Era | 1367 |
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| Each of the 3 km long transfer lines between the SPS and the LHC is equipped with two beam stoppers (TEDs), one at the beginning of the line and one close to the LHC injection point, which need to absorb the full transferred beam. The beam stoppers are used for setting up the SPS extractions and transfer lines with beam without having to inject into the LHC. Energy deposition and thermo-mechanical simulations have, however, shown that the TEDs will not be robust enough to safely absorb the high intensity beams foreseen for the high-luminosity LHC era. This paper will summarize the simulation results and limitations for upgrading the beam stoppers. An outline of the hardware upgrade strategy for the TEDs together with modifications to the SPS extraction interlock system to enforce intensity limitations for beam on the beam stoppers will be given. | ||
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| TUPMR051 | New Spill Control for the Slow Extraction in the Multi-Cycling SPS | 1371 |
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| The flux of particles slow extracted with the 1/3 integer resonance from the Super Proton Synchrotron at CERN was previously controlled with a servo-spill feedback system which acted on the horizontal tune such as to keep the spill rate as constant as possible during the whole extraction time. The current in two servo-quadrupoles was modulated as a function of the difference between the measured and the desired spill rate. With servo quadrupoles at a single location in the SPS ring and the SPS in multi-cycling mode, the trajectory of the slow extracted beam was seen to change from cycle to cycle depending on the current applied by the servo feedback. Hence this system was replaced by a feed-forward tune correction using the main SPS quadrupoles. In this way the spill control can now be guaranteed without changing the trajectory of the extracted beam. This paper presents the algorithm and implementation in the control system and summarizes the advantages of the new approach. The obtained spill characteristics will be discussed. The technique implemented for the additional reduction of the 50 Hz noise on the spill structure will also be briefly outlined. | ||
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| TUPMR052 | Commissioning Preparation of the AWAKE Proton Beam Line | 1374 |
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| The AWAKE experiment at CERN will use a proton bunch with an momentum of 400 GeV/c from the SPS to drive large amplitude wakefields in a plasma. This will require a ~830 m long transfer line from the SPS to the experiment. The prepa- rations for the beam commissioning of the AWAKE proton transfer line are presented in this paper. They include the detailed planning of the commissioning steps, controls and beam instrumentation specifications as well as operational tools, which are developed for the steering and monitoring of the beam line. The installation of the transfer line has been finished and first beam is planned in summer 2016. | ||
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| TUPMR053 | Initial Experience with Carbon Stripping Foils at ISIS | 1378 |
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| The ISIS Facility at the Rutherford Appleton Laboratory is a spallation neutron and muon source based upon a 50 Hz rapid cycling synchrotron accelerating ~3×1013 protons per pulse from 70 to 800 MeV to deliver a mean beam power of 0.2 MW to two target stations. Throughout its 30 years of operation ISIS has developed aluminium oxide foils in-house for H− charge exchange injection. The manufacturing and installation processes for these foils are time consuming, radiologically dose intensive and require a high degree of skill. Commercially available carbon based foils commonly used at other facilities, have the potential to greatly simplify foil preparation and installation in addition to improving beam quality. Similar foils would also be necessary for facility upgrades which increase injection energy to withstand the higher operating temperatures. This paper describes the initial experience of carbon foils in the ISIS synchrotron including issues relating to handling and mounting foils, their performance under beam operation and plans for further development. | ||
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