Summary on SPPC Accelerators

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Presentation transcript:

Summary on SPPC Accelerators Tang Jingyu for SPPC group September 2-3, 2016, CEPC-SPPC Symposium, Beihang

Talks on SPPC Accelerators 12 talks, 19 attendees in the parallel sessions IHEP, USTC, PKU, THU, SINAP Young generation (students/postdocs) is playing a very important role (7/12 talks), especially in accelerator physics studies. Prof. Xiangqi Wang (>70) also gave a talk We reported the design work on the accelerator physics for both the collider and injector accelerators, and also technical issues Good discussions about the key accelerator physics problems and key technical issues

General Progress Tang Jingyu More young people (especially students) joined the study team Maintaining regular monthly meetings Accelerator Physics studies Good progress on the major problems in the collider: lattice, collimation, beam-beam effects, instabilities, injection and extraction, luminosity leveling etc. Schematic design on the injector accelerators: main parameters, stage schemes, lattice and layout, etc Key technology studies Design and R&D on high-field superconducting magnets Study on beam screen and cryogenic vacuum Identifying other key technical challenges: beam dump, collimators etc. A paper on general SPPC design submitted to PRAB is under revision

Parameter Value Unit Circumference 54.3 km Beam energy 35.3 TeV Dipole field 20 T Injection energy 2.1 Number of IPs 2 Peak lumi./IP 1.2E+35 cm-2s-1 Beta* 0.75 m Circu. current 1.0 A Bunch separation 25 ns Bunch population 2.0E+11 Arc SR heat load 56.7 W/m Left: Whole accelerator complex; Right: injector chain of 4 acceleration stages

Key technological issues High-field superconducting magnets Continuous efforts by Xu Qingjin and his group International collaborations (recent visit of Tiina Salmi, Finland) Domestic collaboration: Workshop on High-Temperature and High-Field Superconducting Materials and Application Technology was held on April 28-29, 2016 in Shanghai Beam screen and vacuum Zhu Kun and Gan Pingping continue to study new schemes; recent discussion about strip-like structure looks interesting Wang Yong (and students) studying SEY for different materials RF systems Dai Jianping is focusing on the high-Q ferrite-loaded RF systems for the injector accelerators Other technical issues Needing motivation and funds

R&D efforts and preparation We need long-term R&D efforts to meet the requirements for building SPPC; some of key technologies are extremely challenging. Both funds and manpower are needed The CEPC project obtained the first R&D fund from MoST, while SPPC should try more efforts from NSFC (Tang Jingyu in 2015 and Xu Qingjin in 2016). Paper work on key issues should be pursued, to learn the technical progress and tendency around the world; to provide evidence support for the future R&D applications

About team and collaboration There are a few new students and also international experts joined the study Collaboration on beam collimation with LAL (France) and LHC established; on High-Field Magnets with US labs and others; will seek further collaboration partners CEPC-SPPC is discussing to form an international collaboration structure. We will fit us within the frame

Collider Lattice Design Su Feng, Chen Yukai, Zhang Linhao Design work in parallel Useful lattice versions have been obtained, also used for other studies Two lattice designs for 70 TeV and one for 100 TeV Compatible with CEPC partial double ring (3.5 km LSS) Dynamic aperture calculations (Sixtrack) show reasonable designs

Beam Collimation Zou Ye, Yang Jianquan Beam collimation is extremely important and difficult for SPPC (Stored energy: 6.3 GJ) Heavy beam losses: beam-beam interactions, transverse and longitudinal diffusion, residual gas scattering, instabilities and so on (peak loss: MW level) Quench protection of SC magnets Machine protection Hands-on maintenance Cleaning of physics debris Reducing experiment background Key issues: lattice, methods, materials New idea: Transverse and longitudinal collimation in the same LSS almost proved by simulations (FCC is also studying the scheme)

Impedance and Instabilities Liu Yudong Analysis on key impedance contributions: beam screens and collimators Study on wall impedance for multilayer chamber: analytical and simulations Beam screen: stainless steel (0.6mm) with coating copper (50um), now also HTS Injection protection collimator: hBN (hexagonal boron nitride, 六方氮化硼) coating with Ti(5um) Others Electron cloud study in different sections; characteristics measurements (with a NSFC fund)

Injection/extraction Li Guangrui Injection is important for SPPC turnaround time Extraction is key for machine protection The talk: reviewed the challenges of the injection (e.g. power limit - 5 MJ for each injection) and the injection schemes at FCC-hh; dumping system (extraction) challenges and design concept at SPPC and FCC-hh; lattice considerations

Injector Chain General and p-RCS Tang Jingyu Injector chain by itself is a very complicated and powerful accelerator system, large enough by a single stage Rich physics programs for each stage No close reference accelerators (scaled up by large factors) Totally new, different from LHC or Tevatron (building-up by steps) Design work on each accelerator started: scheme, lattice and even more details (not only feeding the collider but also independent physics program) Key technical challenges should be identified, so needed R&D program can be pursued. Some more details about p-RCS and i-RCS p-linac: 1.63 MW p-RCS: 3.4 MW MSS: 3.7 MW SS: 90 MJ

p-linac and i-linac Lu Yuanrong Different proton and ion reference linacs around the world are reviewed First design for the low-energy parts of proton (RFQ, CH-DTL) and ion linacs (RFQ, IH-DTL), simulation results

SS – Super Synchrotron Layout and preliminary lattice design Wang Xiangqi Layout and preliminary lattice design Dynamic aperture calculations Injection and extraction considerations Fast ramping issue: 30 cycle, 8-10 ramping time, 8-9 T SC magnet, very challenging

High-field Superconducting Magnets Xu Qingjin High-field Superconducting Magnets High-field superconducting magnets are the most challenging and costly part of the SPPC Work is focused on: Design Study of the SPPC Dipole Magnet R&D Steps for the SPPC Dipole Magnet Development of Nb3Sn Rutherford Cable R&D of High Field ReBCO Tape by SSTC R&D of Bi-2212 Superconductor by NIN Preparation for the Model Magnet R&D Very slow building-up of infrastructure Domestic and international collaborations

Workshop on HTS Materials and Applications on April 28-29 Almost key figures in the field attended Try to find our own way to develop HFM for SPPC, and also boost technology development and applications in China

Discussions On key problems (accelerator physics, techniques) On work organization On future collaboration

Thanks to all the speakers and contributors for the nice work and presentations!