Radiation Rules at KEK

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3 Radiation Rules at KEK Normal operation 0.2 µsv/h for Non-designated area (K1) 1.5 µsv/h for Supervised area (K2) experimental hall 20 µsv/h for Simple controlled area (K3) 100mSv/h for access restricted Shielding 100 µsv/event Mis-steering beam loss 1 hour integration of dose rate should not exceed 1.5 µsv/h using radiation monitor. (Terminate injection and wait 1 hour) T.Sanami, IRENG 09/14/

4 Table 2. Limits of exposure a to static magnetic fields. Exposure characteristics Magnetic flux density Occupational b Exposure of head and of trunk Exposure of limbs c General public d Exposure of any part of the body 2 T 8T 400 mt a ICNIRP recommends that these limits should be viewed operationally as spatial peak exposure limits. b For specific work applications, exposure up to 8 T can be justified, if the environment is controlled and appropriate work practices are implemented to control movement-induced effects. c Not enough information is available on which to base exposure limits beyond 8 T. d Because of potential indirect adverse effects, ICNIRP recognizes that practical policies need to be implemented to prevent inadvertent harmful exposure of persons with implanted electronic medical devices and implants containing ferromagnetic material, and dangers from flying objects, which can lead to much lower restriction levels such as 0.5 mt

5 1. Outline about Two Candidate Sites in Japan SEFURI-Site B A KITAKAMI-Site Site-B Site-A Honshu - Belong to FUKUOKA & SAGA Prefecture in KYUSHU District - Located in stable Granite zone - Have not Active Fault zone - Separate from Volcano Front line - Annual average Temperature:12 - Annual total Precipitation : 2,400mm kyushu - Belong to IWATE & MIYAGI Prefecture in TOHOKU District - Located in stable Granite zone - Have not Active Fault zone - Separate from Volcano Front line - Annual average Temperature:10 - Annual total Precipitation : 1,300mm M.Miyahara(Site Inspection) LCWS,Arlington,UTA,Oct22-26,

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7 Scale: I JMA JMA (Japan Meteorological Agency) Acc.(cm/s2): acc=0.45x10^ (0.5I) People Imperceptible to people. Felt by only some people in the building. Felt by most people in the Hanging objects such as lamps swing building. Some people awake. slightly. Felt by most people in the building. Some people are frightened. Many people are frightened. Some people try to escape from danger. Most sleeping people awake. Indoor Situations Dishes in a cupboard rattle occasionally. Hanging objects swing considerably and dishes in a cupboard rattle. Unstable ornaments fall occasionally. Outdoor Situations Electric wires swing slightly. Electric wires swing considerably. People walking on a street and some people driving automobiles notice the tremor. 5- Lower Most people try to escape from a danger. Some people find it difficult to move. Hanging objects swing violently. Most Unstable ornaments fall. Occasionally, dishes in a cupboard and books on a bookshelf fall and furniture moves. People notice electric-light poles swing. occasionally, windowpanes are broken and fall, un-reinforced concrete-block walls collapse, and roads suffer damage. 5- Upper Lower Many people are considerably frightened and find it difficult to move. Difficult to keep standing. Most dishes in a cupboard and most books on a bookshelf fall. Occasionally, a TV set on a rack falls, heavy furniture such as a chest of drawers falls, sliding doors slip out of their groove and the deformation of a door frame makes it impossible to open the door. A lot of heavy and unfixed furniture moves and falls. It is impossible to open the door in many cases. In many cases, un-reinforced concreteblock walls collapse and tombstones overturn. Many automobiles stop because it becomes difficult to drive. Occasionally, poorly-installed vending machines fall. In some buildings, wall tiles and windowpanes are damaged and fall. 6- Upper 800 Most heavy and unfixed furniture moves Impossible to keep standing and falls. Occasionally, sliding doors are and to move without crawling. thrown from their groove. In many buildings, wall tiles and windowpanes are damaged and fall. Most un-reinforced concrete-block walls collapse Thrown by the shaking and impossible to move at will. Most furniture moves to a large extent and some jumps up. In most buildings, wall tiles and windowpanes are damaged and 13fall. In some cases, reinforced concrete-block walls collapse

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9 International Standard Based for Design of Structures - Seismic Actions on Structures 2001 International Organization for Standardization

10 Seismic analysis Definition: Seismic force 0 T S a S a dt C dt T T C c f A 1 T 1 Fh GA RA A d T C T : T C f A Velo F h G A const. R A A 0 2 V Fh GA RA A0 S a = 2 f V F h G V R V V 0 T T 0 A 0 = 15V 0 dt C T C A 0 =200gal: representative value of earthquake In case of hard soil, f A =2.5, f V =2.0, d=0.5, R A =1.0, R V =1.0, G A =1.0, G V =1.0, T C = F h (Damping ratio) =0.02 F h = gal T c 2 f f A G G V A V R R A V V A A A sec dt T c T C S a 2.5 f A F h 1.25 G A 1.0 R A 1.0 A ( gal ) T c =0.33sec= 3Hz dt c =0.16sec= 6.3Hz

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18 ILD Detector in TDR 15.7m 15,000t 3,250/endcap t II 13.2m Yoke/cryostat Figure 3.1.1: The mechanical design of ILD The ILD Coil and Yoke System connections spring Coil to cryostat Yoke and magnet The mechanical design of the return yoke and the solenoid is described in se The central barrel yoke ring supports the detector magnet solenoid. Th cryostat has been designed to carry the load of all central detectors, i.e calorimeters, TPC, inner tracking. The cryostat itself is bolted to 24 double that are welded to the inner support structure of the yoke barrel. Figure 3.1 how the outer cryostat shell is fixed to the barrel yoke (left) and the s deformation of the cryostat under its own load and the load of the barrel cal 2,300t/ring (right). Under the assumption that the loads are distributed evenly over the CAL Mass flanges, maximum deformations of less than 1.3 mm are expected. Simulat 1,000t/solenoid more realistic support system, where the barrel calorimeters are supported in the cryostat, yield maximum deformations of 2.5 mm. Details of th CAL/cryostat Figure 2.6.2: The yoke barrel design: general view of one barrel ring (left) cryostat integration are described in [158]. connections and detailed view of a sector with one supporting foot (right) 2013年 5月 29日 水曜日 O. Ferreira Hadronic barrel calorimeters

19 Recent study by LLR O.Ferreira, March 2012 based on ISO3010 hard soil RS Analysis Results A0=1.5m/s2 Preliminary results / Eigen Modes With the acceleration response spectrum applied along the detector axis, the fundamental mode of the structure dominates: back and forth motion of the yoke ring The max displacement is around 23mm, which is quite high The peak stress is located in the feet. The level seems acceptable but the results need to be checked with a proper design and model Attaching the 3 rings together is probably the way to go to increase the overall stiffness and reduce the peak displacement Global modes 2,6 Hz 5,7 Hz LLR 5,9 Hz 7,8 Hz δ<23mm Modes associated with the coil 11,5 Hz 12,1 Hz 11,7 Hz 150MPa 12,7 Hz O. Ferreira O. Ferreira 9 10 LLR Ecole Polytechnique LLR Ecole Polytechnique based on ISO3010 hard soil RS Analysis Results A0=1.5m/s2 LLR With the acceleration spectrum applied perpendicular to the detector axis, the displacement are significantly lower (less than 5 mm). Due to its geometry, the yoke ring offers a good resistance to side loading The effect is still not negligible With a rail type support, the effect is local: it affects only the calorimeters. The peak displacement increased to around 15 mm δ<5mm δ<15mm LLR Conclusion Seismic load is a major load case that needs to be taken into account when designing instruments to be installed in Japan Detectors and ancillary systems should be designed to be seismic resistant It is desirable to take into account those aspects as soon as possible in the design phase of the instruments Additional and stronger mechanical connections are needed to resist loading from various direction, which significantly impacts the assembly procedure of the detector O. Ferreira 2013年 5月 29日 水曜日 11 LLR Ecole Polytechnique O. Ferreira 12 LLR Ecole Polytechnique

20 6.3'm/s 2' CLIC_SiD'yoke' 'JJPARC'spectrum' Horizontal Maximum'deformaBon:'46.4(mm( Maximum'deformaBon:'22.4(mm( JJPARC'J'ND280'magnet'system'spectrum' Courtesy:'T.'Tauchi'(KEK)' Rigid'strategy'not( feasible'in'high' seismicity'locabons( Maximum'v.'Mises'stress:'601(MPa( Maximum'v.'Mises'stress:'626(MPa( Earthquake(protec5on(for(Linear(Collider(detectors( (LCWS12,(Arlington,(USA( ( 16(

21 6.3'm/s 2' CLIC_SiD'yoke' 'JJPARC'spectrum' Horizontal Maximum'deformaBon:'46.4(mm( Maximum'deformaBon:'22.4(mm( JJPARC'J'ND280'magnet'system'spectrum' Courtesy:'T.'Tauchi'(KEK)' Rigid'strategy'not( feasible'in'high' seismicity'locabons( Maximum'v.'Mises'stress:'601(MPa( Maximum'v.'Mises'stress:'626(MPa( Earthquake(protec5on(for(Linear(Collider(detectors( (LCWS12,(Arlington,(USA( ( 16(

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