## Appendix A ACTIVITY HAZARD DOCUMENT (AHD) #2086

  ------------------------ -------------- ------------- -------------------
  **GENERAL INFORMATION**                               

  **\                      **LOCATION\    **\           **LASER SAFETY
  TITLE**                  Bldg.-Room**   DIVISION**    CONTACT**

  Activity Hazard Document Building 6     Advanced      Sander Caldwell
  for the Laser Heated     (Beamline      Light Source  
  Diamond Anvil Cell       12.2.2)                      
  Experiment at Endstation                              
  2 of ALS Beamline 12.2.2                              
  ------------------------ -------------- ------------- -------------------

+-----------------------------------------------------------------------+
| **DESCRIPTION OF ACTIVITY**                                           |
+-----------------------------------------------------------------------+
| This AHD covers the Laser Heating Diamond Anvil Cell (LHDAC) at the   |
| ALS Beamline 12.2.2. The laser system is based on a commercial        |
| Quantronix Falcon --217 D Nd:YLF infrared (1053 nm) laser with a peak |
| power of 80W in multimode in continuous wave (cw) mode. The laser     |
| head is on an optical bench approximately 3 feet above the hutch      |
| floor. The laser beam is directed to another optical bench above the  |
| first approximately 6 feet above the floor where it is split and      |
| directed downwards to the sample (LHDAC) which sits in the x-ray beam |
| path.                                                                 |
|                                                                       |
| The laser system will be used to heat samples that are contained in a |
| high-pressure apparatus so that the sample is simultaneously at high  |
| pressure and high temperature. The x-ray beam of beamline 12.2.2 will |
| then be used to probe the crystal structure of the sample.            |
+-----------------------------------------------------------------------+

 

+-----------------------------------------------------------------------+
| **DURATION**                                                          |
+-----------------------------------------------------------------------+
| > **X Ongoing**                                                       |
+-----------------------------------------------------------------------+

 

  -----------------------------------------------------------------------
  **IDENTIFICATION OF HAZARDS\
  *Identification of potential hazards associated with the activity,
  lasers, and any additional hazards (e.g., toxic gases)***

   The hazard associated with the activity covered by this AHD is
  exposure to Class IV laser beams.
  -----------------------------------------------------------------------

**MITIGATION OF HAZARDS**

> *Identification of laser(s): Laser specifications*

  ------------------- ------------------- ------------------- ------------------
                      **Laser 1**         **Laser 2**         **Laser 3**

  **Type**            Nd:YLF infrared                         
                      laser                                   

  **Manufacturer**    Quantronix                              

  **Model**           Falcon 217D                             

  **Serial \#**       0104-00314                              

  **Maximum Power**   80W                                     

  **Wavelength(s)**   1053 nm                                 

  **Wavelength Used** 1053 nm                                 

  **Power Used**      80 W                                    

  **Pulse Length**    continuous                              

  **Pulse Repetition  continuous                              
  Rate**                                                      

  **Beam Diameter**   1 mm                                    

  **Beam Divergence**                                         

  **Property \#**     6481129                                 

  **Class**           IV                                      
  ------------------- ------------------- ------------------- ------------------

 

  ----------------- --------------- -------------- -------------------------
  **LASER USERS**                                  

  **\               **Date Laser    **Date Eye     **\
  \                 Safety          Examination\   \
  Employee**        Training\       Completed**    Signature**
                    Completed**                    

  Sander Caldwell   July 7, 2004     July 8, 2004  

  Martin Kunz       August 17, 2004  Nov 15,2003   

  Simon Clark       01/06/04         August        
                                    19,2004        
  ----------------- --------------- -------------- -------------------------

+-----------------------------------------------------------------------+
| **ACCESS CONTROLS, INCLUDING USE OF INTERLOCKS**                      |
+-----------------------------------------------------------------------+
| Access to the laser area is restricted as it is located at the        |
| Advanced Light Source. The laser area is entirely located within the  |
| hutch at beamline 12.2.2. The entrance to the hutch is marked with a  |
| laser warning sign identifying the area as containing a Class IV      |
| laser.                                                                |
|                                                                       |
| An external shutter is mounted directly after the opening to the      |
| laser cavity and interlocked to the hutch door.                       |
|                                                                       |
| Beam enclosures primarily consist of the existing x-ray hutch, whose  |
| one window has been covered with a special acryclic with an OD of \>5 |
| at 1053 nm. This essentially makes the laser system Class I during    |
| normal operation. Inside the hutch there is opaque aluminum paneling  |
| surrounding as much of the beam path as possible.                     |
|                                                                       |
| The permanent beam enclosure will ensure that the entire top optic    |
| bench be enclosed by opaque aluminum panels, as well as the laser     |
| beam path as it makes its way from the lower bench to the upper       |
| bench. The sample area will also be enclosed by the opaque aluminum   |
| material. The top and side panels will only be removed during         |
| installation and alignment and will only be removable by deliberate   |
| use of tools (allen keys).                                            |
|                                                                       |
| Transport of laser beams between the upper and lower table is via     |
| opaque beam tubes. Beam tubes and enclosures will be marked with      |
| laser warning signs.                                                  |
|                                                                       |
| Removal of enclosures, beam tubes, or panels will require tools to    |
| remove fasteners or keys to remove locks.                             |
|                                                                       |
| All hazardous reflections will be terminated in beam stops at the end |
| of their useful paths. Class IV laser warning signs will be posted on |
| the laser and enclosures. Appropriate safety glasses will be worn     |
| during alignment procedures, and whenever Class IV laser beams are    |
| exposed.                                                              |
+-----------------------------------------------------------------------+

 

+-----------------------------------------------------------------------+
| **ALIGNMENT PROCEDURE**                                               |
|                                                                       |
| **Procedural Considerations**                                         |
|                                                                       |
| 1.  To reduce accidental reflections, remove watches, rings, dangling |
|     badges, necklaces, or reflective jewelry before any alignment     |
|     activities begin. Use of nonreflective tools should be            |
|     considered.                                                       |
|                                                                       |
| 2.  Access to the hutch is limited to authorized personnel only.      |
|                                                                       |
| 3.  Consider having someone present to help with the alignment.       |
|                                                                       |
| 4.  Ensure that all equipment and materials needed are present prior  |
|     to beginning the alignment.                                       |
|                                                                       |
| 5.  Ensure that all unnecessary equipment, tools, and combustible     |
|     material (if fire is a possibility) have been removed to minimize |
|     the possibility of stray reflections and non-beam accidents.      |
|                                                                       |
| 6.  Persons conducting the alignment have been authorized by the      |
|     responsible individual.                                           |
|                                                                       |
| 7.  Post a \"Notice\" sign at entrances when temporary laser control  |
|     areas are set up or unusual conditions warrant that additional    |
|     hazard information be available to personnel wishing to enter the |
|     area.                                                             |
|                                                                       |
| **Alignment Methods**                                                 |
|                                                                       |
| 1.  There shall be no intentional intrabeam viewing with the eye.     |
|                                                                       |
| 2.  Reduce the beam power by reducing power at the power supply.      |
|     Avoid the use of high-power settings during alignment as much as  |
|     is practical.                                                     |
|                                                                       |
| 3.  Wear laser protective eyewear at all times during the alignment.  |
|                                                                       |
| 4.  Beam Control: The beam is enclosed as much as practical, the      |
|     shutter is closed as much as practical during course adjustments, |
|     optics/optics mounts are secured to the table as much as          |
|     practical, and beam stops are secured to the table or optics      |
|     mounts.                                                           |
|                                                                       |
| 5.  Areas where the beam leaves the horizontal plane shall be         |
|     labeled.                                                          |
|                                                                       |
| 6.  Any stray or unused beams are terminated.                         |
|                                                                       |
| 7.  Invisible beams are viewed with IR cards, or similar technique.   |
|     Operators are aware that specular reflections off some of these   |
|     devices are possible, and that they may smoke or burn.            |
|                                                                       |
| 8.  No intrabeam viewing is allowed. Cameras or fluorescent devices   |
|     are to be used for intrabeam viewing instead                      |
|                                                                       |
| 9.  Normal laser hazard controls shall be restored when the alignment |
|     is completed. This includes enclosures, covers, replacement of    |
|     beam blocks/barriers, and affected interlocks checked for proper  |
|     operation.                                                        |
|                                                                       |
| Beamline 12.2.2 Specific Alignment Procedures                         |
|                                                                       |
| Only authorized laser users listed in this AHD may perform alignment  |
| and maintenance on the laser and optical systems covered by this AHD. |
|                                                                       |
| 1.  The door to the hutch must be fully closed.                       |
|                                                                       |
| 2.  All panels and optical shields must be in place and               |
|     secured/locked properly during normal operation. Removing or      |
|     opening the laser containment is only allowed for limited         |
|     duration during beam alignment and maintenance.                   |
|                                                                       |
| 3.  A sign will be posted on the hutch door indicating                |
|     "DANGER-Visible and/or Invisible Laser Radiation-Avoid Eye or     |
|     Skin Exposure to Direct or Scattered Radiation-Eye Protection     |
|     Required"                                                         |
+-----------------------------------------------------------------------+

  -----------------------------------------------------------------------
  Laser warning signs shall be posted on the hutch door and on the
  exterior of all beam enclosures.

  -----------------------------------------------------------------------

**EYE PROTECTION**

 It is Berkeley Lab policy that laser protective eyewear must be worn by
all persons within the Nominal Hazard Zone (NHZ) whenever there is an
open Class 3B or Class 4 beam. The NHZ is considered to be the entire
room or laboratory in which the laser is located. The eye protection
must have the appropriate optical density and/or reflective properties
based on the wavelengths of the beams encountered, the beam intensity,
and the expected exposure conditions. At the same time, the need for
laser eye protection must be balanced by the need for adequate visible
light transmission. Contact the LSO to select laser eye protection.
Laser eye protection should be inspected periodically to ensure that it
is in good condition.

  -------------- -------------- ------------------ -------------- ----------------
  **LASER                                                         
  PROTECTIVE                                                      
  EYEWEAR**                                                       

  **Number of\   **Location of  **Manufacturer**   **Optical      **Wavelength**
  Pairs\         Eyewear**                         Density**      
  Available**                                                     

  2              Inside Hutch   GPT                \>7            850-1080nm

  1              Inside Hutch   Laser Med          \>4.5          1064 nm

  1              Inside Hutch   Laser Peripherals  5              1064 nm

  1              Inside Hutch   Laser Vision       \>5            1064 nm

  3              Inside Hutch   GPT                10             1064
  -------------- -------------- ------------------ -------------- ----------------

 

  -----------------------------------------------------------------------
  **BEAM PATH**

  The beam path is enclosed, as described above, except during
  commissioning and alignment. Procedures for commissioning and alignment
  are given above as well.
  -----------------------------------------------------------------------

**MAINTENANCE**

The equipment will be maintained by specially trained and/or certified
laboratory personnel. All relief devices, safety interlocks, alarms, and
other hazard prevention devices will be maintained, calibrated, and
tested for functionality on a regular basis in accordance with standard
industrial practices and recommendations of the manufacturers.

**EMERGENCY PROCEDURES**

Authorized laser users will be familiar with the Building Emergency
Plan, location of emergency equipment, and emergency procedures for
fires, earthquakes, and evacuations. Emergency shut-off procedures for
lasers consist of shutting off the electrical power to the laser
system..

**ANNUAL REVIEW SCHEDULE**

Will be one year from approval date. If new hazards have been
introduced, a full EH&S review will be required. If no changes other
than users have been made (an update of the users list will be sent to
LSO), renewal can be granted by user's division safety coordinator.

## Berkeley Lab Incident Reporting Policy (Class 3B and Class 4 Laser Users)

Accidental laser exposure is a serious event that must result in ceasing
operations pending investigation. The laser setup must be left unchanged
to allow for the analysis of the cause of the accident. Exposed
employees should report to Health Services in Building 26 to be
evaluated for hidden injuries.