Abstracts Brochure - 2nd International Particle Accelerator Conference

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the cyclotron had been manufactured by KIRAMS. KIRAMS is short for Korea Institutes of Radiological and Medical Science. Funding Agency National Research Foundation of Korea Sub Classification: T09 Room-Temperature Magnets Poster Panel 112 ID: 2686 - THPO004 An Active Power Filter Based on Wavelet Analysis, Xiaoling Guo (Private Address, Beijing; IHEP Beijng, Beijing) - As modern accelerator demands a magnet supply with a much higher stability, it is important to improve the quality of the magnet supply. An effective method to improve the output performance active power filter (APF) applied in current supply is proposed. To lowdown the harmonic constituents, the APF circuit generates a harmonic current, which added to the current from the main power supply, to countervail the ones in the supply’s current. At end of this paper, a simulation result is given to prove the effect of APF. Sub Classification: T11 Power Supplies Poster Panel 113 ID: 1926 - THPO006 A Digital Power Supply Control Model in Heavyion Therapy Accelerator Based on Dual Nios Cores, Rongkun Wang (Graduate University, Beijing; IMP, Lanzhou), Youxin Chen, Daqing Gao, Huaihai Yan, Zhongzu Zhou (IMP, Lanzhou) - DC and Pulse is the basic running models of magnet power supply in Heavy-Ion Therapy Accelerator. According to the character of digital power supply and the requirement of Pulse model. This paper introduce a Digital Power Supply Control Model (DPSCM) in Heavy-Ion Therapy Accelerator based on dual Nios cores, which can meet the requirement of two basic running models. The new method develops a system on-chip based on dual Nios cores by SOPC technology in the Altera EP2C35 FPGA. Communication, data processing is completed by one core and reference current setting is completed by another core. Compared with traditional DPSCM, the dual Nios cores run simultaneously and cooperate well, and the system efficiency is remarkably improved, further, cores in parallel can realize reference waveforms switch in pulse model effectively. This paper chooses a model machine in Heavy-Ion Therapy Facility in Lanzhou (HITFiL) as test bench. Experimental results indicate that the system can realize the function of pulse model, and � 33 the stability and current error meet the design requirements. Sub Classification: T11 Power Supplies Poster Panel 114 ID: 3387 - TUPS007 SIS100 Prototype Cryocatcher, Lars Bozyk, Dieter H.H. Hoffmann (TU Darmstadt, Darmstadt), Holger Kollmus, Peter J. Spiller (GSI, Darmstadt) - The main accelerator, SIS100, of the FAIR-facility will provide heavy ion beams of highest intensities. Ionization beam loss is the most important loss mechanism at operation with high intensity, intermediate charge state heavy ions. A special synchrotron design has been developed for SIS100, aiming for hundred percent control of ionization beam loss by means of a dedicated cold ion catcher system. To suppress dynamic vacuum effects, the cryo catcher system shall also provide a significantly reduced effective desorption yield. The construction and tests of a prototype cryo ion catcher is a work package of the EU-FP-7 project COLMAT. A prototype test setup including cryostat has been constructed, manufactured and tested at GSI under realistic conditions with heavy ion beams of the of the heavy ion synchrotron SIS18. The design and results are presented. Funding Agency EU-FP-7 project COLMAT, FIAS Sub Classification: T14 Vacuum Technology Poster Panel 115 ID: 3149 - TUPS023 Secondary Electron Yield on Cryogenic Surfaces as a Function of Physisorbed Gases, Asena Kuzucan, Holger Neupert, Mauro Taborelli (CERN, Geneva), Herbert Stoeri (IAP TUW, Wien) - Electron cloud is a serious limitation for the operation of particle accelerators with intense beams. It occurs if the metal surface secondary electron yield (SEY) is sufficiently high to promote electron multiplication. At low surface temperature SEY is strongly influenced by the nature of the physisorbed gases and by the corresponding surface coverage. These conditions occur in many accelerators operating with superconducting magnets and cold vacuum sections as for instance LHC. In this work we investigated the variation of secondary electron yield of copper, aluminium and electro polished copper as a function of physisorbed N2, CO, CO2, CH4, Kr, C2H6 at cryogenic temperatures. Conditioning of after physisorption of H2O on electro polished copper will also be presented. The results of the various gases are
compared in order to find a rationale for the behaviour of the secondary electrons for various adsorbates. Sub Classification: T14 Vacuum Technology Poster Panel 116 ID: 3356 - TUPS014 Vacuum Performance Simulation of C-band Accelerating Structures, Huijea Lee, Moo-Hyun Cho, Sang-Hoon Kim, Changho Yi (POSTECH, Pohang, Kyungbuk), Won Namkung, Chong-Do Park (PAL, Pohang, Kyungbuk) - A C-band accelerating structure has a higher accelerating gradient than that of the S-band structure. It provides a good benefit of a shorter machine length. In order to effectively use RF power and for cost reduction, the accelerating structure should be as long as possible. We propose a 2.2-m long structure compared to 1.8-m at XFEL/SPring-8. However, longer accelerating structure has worse vacuum performance than shorter accelerating structure. Thus, vacuum conductance of 2.2-m long structure has to be checked. We calculate vacuum performance of accelerating structure by analytical method and FEM. In this paper, we present that the vacuum performance for the 2.2-m long accelerating structure is safe enough for the XFEL LINAC. Funding Agency: This work is partly supported by the MEST and POSTECH Physics BK21 program. Sub Classification: T14 Vacuum Technology Poster Panel 117 ID: 4032 - TUPS028 Performance of Amorphous Carbon Coating for the Mitigation of Electron Cloud in the SPS, Christina Yin Vallgren, Paolo Chiggiato, Pedro Costa Pinto, Holger Neupert, Giovanni Rumolo, Elena Shaposhnikova, Mauro Taborelli (CERN, Geneva) - Amorphous carbon (a-C) coatings have been tested in electron cloud monitors (ECM) in the Super Proton Synchrotron (SPS) and have shown for LHC type beams a reduction of the EC current by a factor 10E4 compared to stainless steel (SS). This performance has been maintained for more than 2 years under SPS operation conditions. Secondary electron yield (SEY) laboratory data confirm that after 1 year of SPS operation, the coating maintains a SEY below 1. The compatibility of coexisting SS and a-C surfaces has been studied in an ECM having coated and uncoated areas. The results show no degradation of the properties of the a-C areas. The performance of diamond like carbon (DLC) coating has also been studied. DLC shows a less effective � 34 reduction of the EC current than a-C, but conditioning is faster than for SS. Three a-C coated dipoles were inserted in the SPS. However, even with no EC detected, the dynamic pressure rise is similar to the one observed in the SS reference dipoles. Measurement in a new ECM equipped with clearing electrodes to verify the relation between pressure signals and intensity of the EC, as well as an improvement of the diagnostics in the dipoles are in progress. Sub Classification: T14 Vacuum Technology Poster Panel 118 ID: 3813 - TUPS037 Preliminary Assessment of Beam Impact Consequences on LHC Collimators, Marija Cauchi, Ralph Assmann, Alessandro Bertarelli, Roderik Bruce, Federico Carra, Alessandro Dallocchio, Daniel Deboy, Nicola Mariani, Adriana Rossi (CERN, Geneva), Luisella Lari (CERN, Geneva; IFIC, Valencia), Nicholas Sammut (CERN, Geneva; University of Malta, Msida), Pierluigi Mollicone (UoM, Msa) - The correct functioning of the LHC Collimation System is crucial to attain the desired LHC luminosity performance. However, the requirements to handle high intensity beams can be demanding. In this respect, the robustness of the collimators plays an important role. An accident which causes the proton beam to hit a collimator might result in severe beaminduced damage and, in some cases, replacement of the collimator, with consequent downtime for the machine. In this paper, several case studies representing different realistic beam impact scenarios will be shown. A preliminary analysis of the thermo-mechanical response of several collimators to beam impact will be presented, from which the most critical cases can then be identified. Such work will also help to give an initial insight on the operational constraints of the LHC by taking into account all relevant collimator damage limits. Sub Classification: T19 Collimation Poster Panel 119 ID: 4557 - TUPS044 Recent Developments on the IFMIF/EVEDA Beam Dump Cooling Circuit, Marcos Parro, Fernando Arranz, Beatriz Brañas, Daniel Iglesias, David Rapisarda (CIEMAT, Madrid) - During the IFMIF/EVEDA activities a conical dump made of copper has been designed to stop the 125 mA, 9 MeV, D+ beam. This element will receive a total power of ~1 MW. It is cooled by a high velocity
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Abstracts Brochure - 2nd International Particle Accelerator Conference

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