Safety Protection against 100 J and 100 TW Lasers Used in European - PowerPoint PPT Presentation

Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment Eric Boyd, Dr Sigrid Kozielski, Dr Pouneh Saffari Safety and Radiation Protection Group Ninth International Workshop on Radiation Safety at Synchrotron Radiation Sources Hsinchu, Taiwan

2 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Overview Overview of HED experiment Special Considerations Involving High Powered Lasers Operating Modes of the High Powered Lasers Expected Dose Rates Concrete Shielding Prevention of Activation Additional Shielding Considerations Shutters Collars Transfer Pipes Chicanes Radiation Monitoring Active Passive Interlocks Laser Radiation

3 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Scientific Instrument HED: High Energy and Density Science Combines hard X-ray FEL radiation and high energy optical lasers to generate matter under extreme conditions of pressure, temperature or electric field. Scientific applications will be studies of matter occurring inside exoplanets, of new extreme-pressure phases and solid-density plasmas. Key Features Bandwidth ΔE/E 10-3 (natural FEL source) and 10-4 (standard monochromator, seeding); 10-6* (high-resolution monochromator) Photon energy range 3–5 keV**, 5–20 keV, 20–25 keV** Polarization Linear (horizontal) Circular (future option) Pulse duration 2–100 fs FWHM Beam size Sub-µm to > 100 µm (provided by various compound refractive lens stages) >mm unfocused Special optics Split and delay line (BMBF contribution) High-resolution monochromator This artist concept depicts in the foreground planet Kepler-62f, a super-Earth-size planet in the habitable Optical lasers High-energy (100 J-class) long pulse (>ns) laser (HIBEF contribution) zone of its star, which is seen peeking out from High-intensity (100 TW-class) short pulse (~30 fs) laser (HIBEF contribution) behind the right edge of the planet. NASA/JPL Pump–probe (mJ to 100 mJ class) short pulse (~15 fs – 1 ps) laser *10 -6 bandwidth only for a few selected photon energies **Limited in terms of focusing capability, available photon number of sample, quantum efficiency of detectors

4 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Basics Beam Transport Beam Shutter HED Laser Hutch HED Experiment Hutch HED Optic HED Control Special considerations for HED Experiment Beam Shutter HED high powered laser can produce ionizing radiation • Only HED Experiment Hutch will be a radiation area when • Beam Shutter these lasers are operating in "shot mode" Prior to operating these lasers the experiment hutch must • HED Experiment be searched. This will be the same search that is performed prior to FEL operation

5 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment High Power Laser Modes

6 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment HED EXP HUTCH Calculations carried out by Anna Ferrari from Helmholtz-Zentrum Dresden-Rossendorf • 10 Hz continuous operation = 36000 shots/hr • Results in a maximum dose rate of 5.4 Sv/hr inside the hutch at the west wall • Results in a Maximum Dose Rate of 1.8 μ Sv/hr @ 10 Hz of Continuous operation. • 10 Hz of Continuous operation is not realistic due to destruction of the target

7 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment HED EXP HUTCH Calculations carried out by Anna Ferrari from Helmholtz-Zentrum Dresden-Rossendorf 18 Sv/hr inside the hutch at the north wall 0.72 μ Sv/hr outside the hutch at the north wall

8 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Wall Description Thickness HED Concrete Shielding East Entrance for x-ray FEL, entrance 0.8 m heavy for PP-OL beams concrete North Principle laser pointing direction; 1.0 m heavy distance to IA point approx. 4m concrete West Secondary principle laser 0.8 m heavy pointing direction; distance to IA concrete point approx. 6-8 m South Access door; opposite to 0.5 m heavy principle laser pointing direction concrete Roof Entrance for UHI and HE-OL 0.8 m normal beams; height 2.6 m above IA concrete point Thickness of Heavy concrete wall is to keep the radiation level outside the hutch <0.5 μ Sv/h taking into account up to 5 MeV electrons generated by the short pulse laser.

9 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Particle Radiation from Plasma Lasers All Aluminum chamber to avoid activation during relativistic laser-plasma experiments.

10 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Additional Shielding Considerations - Shutter When High Powered HED lasers are operated in the EXP Hutch and the XFEL is not, an additional shutter is required to prevent radiation from entering the HED OPT Hutch. This shutter can only be opened after the HED OPT hutch has been searched This shutter has to be opened before the upstream HED OPT HED EXP beam shutter is opened allowing XFEL in the HED EXP Hutch

11 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Additional Shielding Considerations - Shutter Additional Beam Shutter for HED High Powered Laser Radiation Type 1 Front End Beam Shutter

12 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Additional Shielding Considerations – Laser Pipe Collars Shielded Collar for Laser Transfer Pipes Calculations carried out by Anna Ferrari from Helmholtz-Zentrum Dresden-Rossendorf Constructed out of Stainless Steal 2 cm thick 40 cm in length Air gap filled with Barite Sand

13 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Additional Shielding Considerations – Pump Probe Laser Transfer Pipe Shielding Lead Shield for Pump Probe Laser Transfer pipe Radiation Collimated Insert

14 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Additional Shielding Considerations – Lead Corner Chicanes The two back corners of the HED Experiment Hutch will each have a 50 cm by 50 cm opening directly beneath the celling for the routing of cables and media in to the hutch. Lead bricks will be used to construct a 20 cm thick chicane that is 150 cm long, extending from the top of the HED celling to 100 cm below the bottom of the opening.

15 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Radiation Monitoring During Operation – Active PANDORA Photon And Neutron Dose Rate meter for Accelerators Developed by DESY and BERTHOLD. Combines He Proportional counter and a scintillator-photomultiplier system. Dose-Measurement of Photons- and Neutrons in continuous and pulsed fields. Monitoring via Ethernet. Interlock-Functionality by 2 Relays. There will be an alarm forecast for each PANDORA If the alarm is approaching but still a long time ahead, minor changes of the beam optics may help. If the alarm is a medium time ahead, reduction of the number of bunches or of the bunch charge may help prevent an alarm. If the alarm will happen soon, the beam injection into the south branch has to be stopped and the beam shutter in front of the XTD1 (south branch) has to be closed. Also Trips Laser interlock for high-powered Lasers

16 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Radiation Monitoring During Operation – Passive Dosimetry The EDIS-1 is able to detect the entire range of photon energies measured by ambient dose equivalent (H*10) which is 15 keV to 9 MeV and has the ability to operate in pulsed fields. The dosimeters would be read by the SRP group using the DBR-1 DIS dosimetry reader, at regular intervals throughout the year and their dose rates recorded then put back at their designated locations.

17 Safety Protection against 100 J and 100 TW Lasers Used in European XFEL Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017 HED Experiment Interlock Overview - Laser • In order to remove all laser hazards from the room the interlocks needs to: 1. Shut the Amphos Laser Safety shutter. 2. Isolate the Visar laser by shutting 2.LSS.08. 3. Isolate the Nanosecond laser 4. Isolate the HED high power lasers by doing the following in the following order • Interrupt the HE-OL and HI-OL pump lasers. • The failure to the interruption of the pump lasers will result in the main trigger removed from the HE-OL and HI-OL lasers. • 2.LSS.06 and 2.LSS.07 must close (if they are not already closed). Logo Logo