Status of Radiation Safety System at
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1 Status of Radiation Safety System at Taiwan Photon Source Joseph C. Liu Radiation and Operation Safety Division National Synchrotron Radiation Research Center, Taiwan
2 NSRRC layout 1.5 GeV, 120m, 400 ma Taiwan Light Source (TLS) Taiwan Photon Source (TPS) 3 GeV, m, 500 ma Natural emittance: 1.6 nm-rad Straight sections: 7 m (x 18); 12 m (x 6) Administration and Operation Center Academic Activity Center 2
3 Major parameters of TPS Energy Current SR circumference BR circumference Lattice Straight sections Bending magnets Emittance Coupling RF frequency RF gap voltage RF power 3 GeV 500 ma at 3 GeV (Top-up injection) m (h = 864 = , dia.= m) m (h = 828 = , dia.= m) 24-cell DBA 12 m x 6 ( σ v = 12 µm, σ h = 160 µm) 7 m x 18 ( σ v = 5 µm, σ h = 120 µm) nm rad at 3 GeV (Distributed dispersion) 1 % 500 MHz 2.8~3.5 MV (3 SRF cavities) 750 kw (3 SRF cavities) 3
4 Radiation Safety System of TPS PAST External review of preliminary Safety Analysis Report (SAR) Revised SAR submitted to Taiwan AEC and approved NOW Accelerator shielding is completed Shielding design for 7 phase I beamlines is under-way Performance verification of radiation detector Commissioning of LINAC and SRF FUTURE Installation of access control system Deployment of detector and monitoring network Radiation safety control of commissioning 4
5 TPS SAR peer review and approval Preliminary SAR was drafted and reviewed in 2009 Methodology, tools and results were reviewed. Final SAR submitted to Taiwan Atomic Energy Council in Installation permission of high intensity radiological facility was granted in
6 Dose limit: TPS vs TLS & others Parameter ALS SSRL NSLS-II APS TLS TPS Ring Circumference (m) Stored Beam Energy (GeV) Stored Current, I (ma) Stored Energy (J) Stored Beam Power, Ps (MW) Design Lifetime, τ (h) Typical Straight Length (m) GB Power from Straight (µw) Ring Floor Shielding Limit (msv y -1 ) Beamline Shielding Limit (msv y -1 ) Site Boundary Dose Limit (msv y -1 ) Ref: Radiat Prot Dosimetry Nov;137(1-2):
7 Progress of TPS construction 2010 TLS only TLS+TPS 7
8 Shielding & dose simulation 8
9 Accelerator shielding 9
10 Duel IDs in one Straight, Double mini-βy lattice 10
11 Beamline shielding Bremsstrahlung: collimator, stopper, local shielding. Monte-Carlo code: FLUKA Synchrotron: hutch, shielding enclosure, exclusion zone.. Analytical code: STAC8 Dose rate limit: 0.5µSv/h Where users are accessible. Synchrotron Radiation: Low energy, high flux Bremsstrahlung: High energy, low photon flux 1. Gas bremsstrahlung 2. Bremsstrahlung streaming from beam loss 11
12 Dose assessment for GB scattering 30cm PB Collimator 30cm W Stopper Gamma dose rate (µsv/h) Neutron dose rate (µsv/h) 12
13 Dose assessment for GB scattering 10cm PE Enclosure around Stopper Gamma dose rate (µsv/h) Neutron dose rate (µsv/h)
14 Dose evaluation for synchrotron Mono beam Power loss, W Diamond filter 37.7 Be window 2 Slits (intercept beam) 47.6 VBPM (intercept beam) 47.6 HBPM (intercept beam) 47.6 Screen (intercept beam) 47.6 DCM 47.6 VFM << 1 HFM << 1 HFM VFM DCM µ Protein Crystallography White beam Beryllium window Incoming power 87.3 W thru FE-slits (worst case) Diamond filter 14
15 TPS Radiation Safety System & interlock Access Control System LINAC ACS Booster/Ring ACS Personnel Protection System Top Up Safety Interlock Radiation Monitoring Interlock Operation Envelope Limiter Accelerator Monitoring Beamline Monitoring TPS Interlock BL Radiation Safety Interlock Vacuum Interlock Machine Protection System Cooling Interlock Mis-steering of Electron Beam Subsystem Protection SRF IU etc. 15
16 Access control system Diamond, UK Ring divided into 4 sections Search sequence Emergency shut down mechaniam High electric voltage protection Oxygen deficiency evaluation for cryogenic leakage 16
17 Radiation safety for Top-up operation Facility Ray tracing simulation Minimum current interlock Dipole setting interlock Bending magnet in front-end Interlocked rad. monitoring TPS TLS ESRF PETRA III SSRL SPring-8 PLS ELETTRA ALS CLS Diamond SOLEIL ALBA NSLS-II PF APS Note: Measures explicitly indicated by each facility are shown. 17
18 Radiation monitoring & interlock Annual dose limit 1mSv 2000 working hours = 0.5 µsv/h Accumulating 4 hours, integrated dose (γ+n) 2 µsv Inhibited device: For accelerator: LINAC e-gun & RF For beamline: heavy metal shutter ESRF Beamline radiation monitoring Accelerator Monitoring Beamline Monitoring 18
19 Control scheme and network for radiation monitoring system Instrumentation & Control Group Control room Accelerator Operation Group Gamma & Neutron Detector Ethernet Radiation & Operation Safety Division Message Notification ROSD Safety Officer 2pin Cable Interlock Control Automatically Display Communication Control 19
20 Environmental monitoring 20
21 New radiation detectors Thermo FHT-191 N ionization chamber FHT 762 Wendi-2 Neutron detector (He-3) FHT 6020 Display and Alarm Unit for interlock and data logging FHT 191 N Measurement Ranges Energy Range Data Memory FHT 762 Wendi-2 Measurement Ranges Ionization chamber Gamma dose rate measurement from 10nSv/h up to 10Sv/h 35 kev to 7 MeV 256 periods of selectable length (history) Wide-Energy Neutron Detector 1µSv to 100mSv/h Cf-252 Energy Range 25meV to 5 GeV according to ICRP 74 (1996) Sensitivity Sensitivity: 0.84 cps/(µsv/h) Cf-252 Gamma sensitivity: 1 to 5µSv/h at 100 msv/h, 662keV 21
22 Functional test & comparison Various radiation environments 150 MeV LINAC 1.5 GeV TLS Beamline hutch
23 Inside BL15 optics hutch Stored Current 60 refill injections / 60 mins Time structure of Top-up refill injection Dose
24 LINAC commissioning Preview of TPS rad. safety practice Licensing, shielding, monitoring, ACS, survey, simulation and safety control. Beam power & workload Op. Envelope: 150MeV, 3Hz, 1~3nC 24
25 LINAC radiation survey Earth Line > ~999 10~99 1~9 below 1 Dose Rate in µsv/h dump Downstream Wall of LINAC May11, to conc. wall 4nC,150MeV 150MeV, 5Hz
26 Conditioning of SRF and survey
27 2013/01/14 SRF (110kW,1.6MV) Dose ~ 550µSv/h downstream of SRF inside the bunker. Dose ~1.1µSv/h at the joint of shielding wall. 1.1µSv/h
28 2013/01/15 SRF (300kW,2.4MV) Dose can easily reach several tenths of thousands at high power. Maximum dose 50~68 msv/h. Notable dose at working area 1µSv/h 0.5µSv/h
29 Radiation safety of TPS Regulatory requirement: Exempt of environmental assessment Review of TPS SAR Permission of LINAC commission Permission of TPS commission Approval of TPS operation Responsible system: Dose evaluation and safety assessment Shielding design for accelerator and beamline Monitoring network and interlock Access control system Radiation safety interlock Toxic waste disposal facility Operation coordination: Safety audit on civil construction Interface discussion for interlock Radiation safety control on commissioning Industrial hygiene of installation 29
30 Operation Envelope Effect of stored current & beam lifetime
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