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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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 - - 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
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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
- ccurring 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 Optical lasers High-energy (100 J-class) long pulse (>ns) laser (HIBEF contribution) High-intensity (100 TW-class) short pulse (~30 fs) laser (HIBEF contribution) 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 This artist concept depicts in the foreground planet Kepler-62f, a super-Earth-size planet in the habitable zone of its star, which is seen peeking out from behind the right edge of the planet. NASA/JPL
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Basics
HED Experiment HED Optic HED Control Beam Shutter Beam Shutter
Beam Transport HED Experiment Hutch HED Laser Hutch
Beam Shutter
Special considerations for HED Experiment
- HED high powered laser can produce ionizing radiation
- Only HED Experiment Hutch will be a radiation area when
these lasers are operating in "shot mode"
- Prior to operating these lasers the experiment hutch must
be searched. This will be the same search that is performed prior to FEL operation
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
High Power Laser Modes
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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 1.8μSv/hr @ 10 Hz of
Continuous operation.
- 10 Hz of Continuous operation is not realistic due to destruction
- f the target
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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 μSv/hr outside the hutch at the north wall
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
HED Concrete Shielding
Wall Description Thickness East Entrance for x-ray FEL, entrance for PP-OL beams 0.8 m heavy concrete North Principle laser pointing direction; distance to IA point approx. 4m 1.0 m heavy concrete West Secondary principle laser pointing direction; distance to IA point approx. 6-8 m 0.8 m heavy concrete South Access door; opposite to principle laser pointing direction 0.5 m heavy concrete Roof Entrance for UHI and HE-OL beams; height 2.6 m above IA point 0.8 m normal concrete
Thickness of Heavy concrete wall is to keep the radiation level outside the hutch <0.5 μSv/h taking into account up to 5 MeV electrons generated by the short pulse laser.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Particle Radiation from Plasma Lasers
All Aluminum chamber to avoid activation during relativistic laser-plasma experiments.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Additional Shielding Considerations - Shutter
HED EXP
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
- pened after the HED OPT
hutch has been searched This shutter has to be opened before the upstream HED OPT beam shutter is opened allowing XFEL in the HED EXP Hutch
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Additional Shielding Considerations - Shutter
Type 1 Front End Beam Shutter Additional Beam Shutter for HED High Powered Laser Radiation
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Additional Shielding Considerations – Laser Pipe Collars
Calculations carried out by Anna Ferrari from Helmholtz-Zentrum Dresden-Rossendorf
Shielded Collar for Laser Transfer Pipes
Constructed out of Stainless Steal 2 cm thick 40 cm in length Air gap filled with Barite Sand
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Additional Shielding Considerations – Pump Probe Laser Transfer Pipe Shielding
Lead Shield for Pump Probe Laser Transfer pipe Radiation Collimated Insert
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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. 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
- f 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 There will be an alarm forecast for each PANDORA
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
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.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Interlock Overview - Laser
Logo Logo
- 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).
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Interlock Overview - Laser
- The following things will cause the interlocks to remove all laser hazards from the room.
1. Two doors of the airlock open at the same time (A.12.D1, A.12.D3). 2. Opening of A.12.D2 3. The pressing of a panic button in HED Experiment 4. The pressing of an emergency off button in HED Experiment (all electrical power to the room will also be removed) 5. Alarm from PANDORA radiation detector
- Whenever an interlock initiates a protective action an error message should appear in the Karabo interface.
Additional interlocks for A.12
- A hutch search can not begin if the any of the laser interlocks are set
- HED EXP must be searched for remote operation of 2.LSS.04, 2.LSS.06, 2.LSS.07 or 2.LSS.08 from the
control hutch
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Remote Control Panel for High Powered Lasers
Alignment Mode is interlocked so that it can only be set if the laser interlocks have been activated in HED EXP A.12 Shot Mode is interlocked so that it can only be set if HED EXP A.12 has been searched. Signal comes from Radiation Protection Interlocks Pressing this button will take the laser out of either “Alignment” or “Shot Mode” Indicates that laser interlocks are set in A.23 Indicates that A.23 has been searched After Pressing of the “Alignment”
- r “Shot Mode” buttons the
Operator must confirm the
- peration mode by pressing this
- button. An Announcement is then
made in HED EXP A.12 announcing the operation mode. Shutters 2.LSS.06 or 2.LSS.07 can only be opened when Laser is in Alignment Mode or SHOT MODE. In “OFF” 2.LSS.06 or 2.LSS.07 can only be opened from the Local panel in HED LASER. In “ON” they can be opened only from the remote panel in HED
- Control. Key must be removed
from Local panel and placed in remote panel.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Interlock Overview - Radiation
The Personnel Protection System controls the beam shutters so that the XFEL beam (or HED High Powered Lasers in shot mode for HED EXP) will not enter the hutch unless: The hutch has been searched ensuring nobody remains inside the hutch. All doors are closed and interlocked. All user chicanes are closed and interlocked. An audible and visual beam warning has been issued inside the hutch.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Interlock Overview - Radiation
To fulfill the safety requirements, features of the personnel protection system include the following. An announcing system to alert personnel of a search or impending beam operations. Emergency off buttons to allow trapped personnel to remove the beam operation permission signal and exit the hutch. Illuminated warning signs to alert personnel when radiation can be present inside the hutch. DACHS card terminals to begin and end hutch searches Emergency access buttons to unlock the door in case of an emergency. Beam shutters and their protective measures Radiation monitors Interlock keys
Interfaces between Laser and Radiation Interlocks
User chicanes Hutch search feature Door contacts Emergency off/access Access control
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017
Summary
Two high powered lasers capable of producing ionizing radiation will be part of the HED experiment Radiation and laser Interlocks need to work together to ensure multiple operation modes. XFEL operating alone High powered lasers operating alone in multiple modes XFEL operating in conjunction with High Powered Lasers Pump Probe Laser operating alone PP Laser operating in conjunction with XFEL, High Powered lasers or both Shielding considerations also need to account for all operating modes.
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Safety Protection against 100 J and 100 TW Lasers Used in European XFEL HED Experiment
Eric Boyd, Radsynch 2017, Hsinchu Taiwan, 20 April 2017