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     ![](media/image1.wmf){width="0.44166666666666665in"                    
     height="0.41597222222222224in"} **Fermilab Directorate**               

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

**MEMORANDUM OF UNDERSTANDING**

**FOR THE 2007-2009 TEST BEAM PROGRAM**

**T969**

**G**amme**V**

A gamma to milli-eV particle search

April 10, 2007

INTRODUCTION 3

I. PERSONNEL AND INSTITUTIONS: 5

II\. EXPERIMENTAL AREA, BEAMS AND SCHEDULE CONSIDERATIONS 5

III\. RESPONSIBILITIES BY INSTITUTION - NON FERMILAB 6

IV\. RESPONSIBILITIES BY INSTITUTION - FERMILAB 7

4.1 Fermilab Accelerator Division 7

4.2 Fermilab Particle Physics Division 7

4.3 Fermilab Technical Division 8

4.4 Fermilab Computing Division 9

4.5 Fermilab ES&H Section 9

4.6 Fermilab Workforce Development and Resources Section 9

V. Summary of Costs 10

VI\. SPECIAL CONSIDERATIONS 11

SIGNATURES 12

appendix i - Hazard Identification Checklist 13

APPENDIX II LASER HAZARD REQUIREMENTS 14

APPENDIX III - CRYOGENIC AND ELECTRONICS HAZARD requirements 14

APPENDIX iV -RUN PLAN 14

INTRODUCTION

This is a Memorandum of Understanding (MOU) between the Fermi National
Accelerator Laboratory and experimenters of the **G**amme**V**
experiment who have committed to participate in this test experiment to
be carried out during the 2007 laboratory program.

This memorandum is intended solely for the purpose of providing a work
allocation for Fermi National Accelerator Laboratory and possible
participating universities and institutions. It reflects an arrangement
that is currently satisfactory to the parties involved. It is
recognized, however, that changing circumstances of the evolving
research program may necessitate revisions. The parties agree to
negotiate amendments to this memorandum to reflect such revisions.

The **G**amme**V** experiment is a gamma to milli-eV particle search
using a "light shining through a brick wall" technique.

MOTIVATION

The milli-eV mass scale may be relevant to the energy frontier, neutrino
properties, and astroparticle mysteries such as dark matter and dark
energy. In the energy frontier, a see-saw mechanism between the
electroweak symmetry scale and the Planck scale could give rise to
phenomenon at the M^2^*~EW~* / M*~PL~* \~ 1 meV scale. Neutrino mass
differences are measured in units of meV. Possible candidates for dark
matter such as a gravitinos or axions may exist at the meV scale.
Finally, it is noted that vacuum energy density described by dark energy
is Λ^4^\~ 7 x 10^-30^ g/cm^3^ \~ (2 meV)^4^. The **G**amme**V**
experiment seeks to detect oscillations between gamma's and meV mass
scale particles to begin study in this interesting region.

Recently, the PVLAS collaboration has reported measurements of anomalous
vacuum magnetic dichroism or polarization rotation \[PRL 96, 110406
(2006)\] and birefringence or polarization ellipticity generation
\[ICHEP06\] which, when interpreted as a new two-photon interaction,
imply new resonances of the vacuum at the milli-eV scale with a coupling
constant between 10^-6^ and 10^-5^ GeV^-1^ (interpretations such a
milli-charged fermions also appear in the theoretical literature). The
PVLAS measurement itself and the interpretation have received some
criticism. The meV scale particle would be an axion-like particle (ALP)
with a much stronger coupling than expected for the QCD axion. In
addition, limits set by the CAST experiment at CERN, which seeks to
detect ALPs produced in the sun, are in contradiction with this
interpretation of the PVLAS signal. However, there are theoretical
models which evade these limits and would remove the contradiction. The
prospect that the PVLAS signals could be a first indication of a beyond
the Standard Model particle has resulted in a number of proposals at
various laboratories world-wide to check the interpretation. The
**G**amme**V** experiment can test the PVLAS region of interest in an
efficient manner with the potential of being the first experimental test
world-wide of the expected photon regeneration process assuming the new
milli-eV particle interpretation.

The ALP interpretation of the PVLAS data can be tested in a "light
shining through a brick wall" experiment where a photon in a high
magnetic field can convert into an ALP, travel through the "brick wall,"
and then reconvert back into a photon. Such an experiment has previously
been performed by the BFRT collaboration \[Z Phys. C, 56, 505 (1992)\]
in the early 1990s. The probability for a photon to be regenerated
depends on the length of the traversal in the magnetic field and BFRT
happened to use a magnet which gave a result with minimal sensitivity in
the meV mass range exactly where the PVLAS signal would suggest a new
resonance may occur.

PROJECT DESCRIPTION

The experimenters will perform a "light shining through a brick wall"
experiment that has sensitivity in the PVLAS region of interest. This
sensitivity happens quite naturally using a 6m long Tevatron dipole
magnet with a 5T field in which sits a beam absorber or "brick wall", an
existing pulsed Nd:YAG laser, and a single photon counting PMT. The
experiment is unique in the way that the "brick wall" is moved to
different discrete positions in order to span the mass range with
maximal sensitivity. The experiment is also unique in that it is of
smaller scale than other proposals, costs less, and should produce
results more quickly than the competing experiments. Similar to neutrino
oscillations, the conversion and reconversion probabilities oscillate
with the magnetic baselines, *L*~i~, before and after the "brick wall"
and the total probability is given by:

![](media/image2.png){width="3.7493055555555554in"
height="0.4354166666666667in"}

Using a 5T Tevatron magnet and an existing frequency-doubled Nd:YAG
laser which produces 160 mJ, 5ns pulses of 532nm light at a frequency of
20 Hz, and assuming the central values for the mass and coupling given
by PVLAS, the regeneration probability is given by:

![](media/image3.png){width="5.99375in" height="0.7138888888888889in"}

With the "brick wall" in the center of a 6m long magnet, *L*~1~ = *L*~2~
= 3m, the signal rate including detector efficiency would be 5 x 10^-3^
Hz. Using a low noise (100Hz) PMT that has a 5ns pulse window, the noise
rate (coincidence with the 20Hz laser pulse) is given by R~Noise~ \~ (20
Hz) (5 ns) (100 Hz) \~ 1 x 10^-5^ Hz. The 95% CL limits that can be set
with 5 hrs of running at a variety of "brick wall" positions are
calculated. The L1=L2=3m and L1=0.8, L2=5.2m configurations cover the
(purple) PVLAS region of interest and fill in the BFRT region of minimal
sensitivity (black).

![](media/image4.png){width="2.3409722222222222in"
height="2.3368055555555554in"}

The figure below shows the schematic of the experiment.

# **PERSONNEL AND INSTITUTIONS:**

Scientific co-spokespersons: A. Chou, Fermilab

W. Wester, Fermilab

The group members at present are (all Fermilab):

1.  A. Chou, W. Wester, A. Baumbaugh, P. Mazur, J. Steffen, R. Tomlin,
    Xi Yang, J. Yoo

Other commitments:

> Pierre Auger: A. Chou, P. Mazur
>
> CDMS : J. Yoo
>
> CDF, DES, SNAP: W. Wester
>
> PPD Electrical Engineering: A. Baumbaugh

Acc Div.: R. Tomlin, Xi Yang

# **II. EXPERIMENTAL AREA, BEAMS AND SCHEDULE CONSIDERATIONS**

1.  LOCATION

    1.  The **G**amme**V** experiment will be conducted at the Magnet
        Test Facility (MTF) located in Industrial Building 1 (IB1) at
        Fermilab. Test Stand 6 in MFT will be used to support the
        magnet. The laser box will be supported near the feed can which
        services the magnet for cryogenic operation. A 36 in. x 36 in.
        optical bench that is incorporated into the laser box will be
        supported on a large cement block on the floor of MTF or in a
        similar way in a manner that allows for access to nearby
        existing equipment. The PMT box will be supported approximately
        2-3 meters beyond the cryogenic return can on the stand that is
        sometimes used to support a second magnet. A small area adjacent
        to the PMT box will be used for the computer and DAQ system.
        This location is operated by the Technical Division.

    2.  The mechanical construction of the Laser and PMT boxes and the
        plunger will take place at Lab 8 facility in the Fermilab
        Village, which is operated by the Particle Physics Division.

    3.  The optical prototype will be assembled and operated in the
        Linac Laser lab in the Linac building. This room is configured
        with an interlock as a safety measure for the operation of a
        Class IV laser. This area is operated by the Accelerator
        Division.

    4.  The data acquisition electronics and software will be assembled
        on the 14^th^ floor of Wilson Hall at Fermilab in space used by
        the electrical engineering department of the Particle Physics
        Division.

    5.  Various other areas are expected for short term tests such as
        the laboratory space in the cross connect at SiDet operated by
        the Particle Physics Division, which has various test stand dark
        boxes that can be used for bench testing of the photomultiplier
        tube.

2.  BEAMS (LASER only)

    1.  The **G**amme**V** experiment will use a photon beam generated
        by a Class-IV Nd:YAG laser at 1064nm capable of 420mJ pulses at
        20Hz. When the light is frequency doubled to 532nm, the energy
        per pulse is 160mJ which is approximately 4.3 x 10^17^ photons
        per pulse or an average power of approximately 3.2W.

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2.  SETUP

    1.  The **G**amme**V** experiment and support systems will be
        installed and operated at the MTF in Industrial Building 1.

    2.  Crane operators will be needed to mount the chosen Tevatron
        dipole magnet on Test Stand No 6 -- this is part of normal
        operations in the facility and a candidate magnet, TC1206,
        currently is mounted. The experimenters also anticipate the need
        to move a large cement block or other structure to be used for
        supporting the laser box near the feed can.

    3.  Additional equipment including the laser box, PMT box, and
        plunger can be transported on a cart. PPD technical personnel
        will be responsible for the setup of these items with minimal
        consultation with MFT technical personnel.

    4.  A small number of cables will interface various components of
        the experiment to the data acquisition system. No extra-ordinary
        cabling effort is required.

3.  SCHEDULE

    1.  The set-up of the experiment will occur during the month of
        May 2007. This will involve the movement of most of the
        materials (laser box, PMT box, and plunger) from Lab 8 and into
        the magnet test facility.

    2.  The first half of June 2007 will involve the integration of the
        equipment onto the Test Stand including various alignment and
        laser tests and measurements. The end step of this activity will
        be the installation of the photomultiplier tube.

    3.  Data taking will begin in the second half of June 2007.

    4.  Additional data taking may be required in July 2007 in order to
        verify initial results of the experiment. In addition, since
        **G**amme**V** will have to operate with minimal disturbance to
        LARP testing and the vertical test stand commissioning, the data
        taking running period may be adjusted from this schedule.

# **III. RESPONSIBILITIES BY INSTITUTION - NON FERMILAB**

Placeholder. The experiment does not have non-Fermilab collaborators at
this time.

1.  Placeholder \[\$0k\]

**IV. RESPONSIBILITIES BY INSTITUTION - FERMILAB**

## 4.1 Fermilab Accelerator Division

1.  The experimenters require Accelerator Division support in approving
    of the use of the particular Tevatron magnet, allowing for use of
    the Laser lab in the Linac area, and allowing Ray Tomlin (6 weeks)
    and Xi Yang (2 weeks) to work/consult on the experiment.

2.  The Accelerator division will provide use of the Continuum Surelite
    Laser as well as an HeNe alignment laser and other optical
    components under Ray Tomlin's care.

4.1.S Summary of Accelerator Division costs:

Type of Funds Equipment Operating Personnel

(person-weeks)

Total new items \$0.0K \$0K 8.0

## 4.2 Fermilab Particle Physics Division 

## 

## The Particle Physics Division will be the source of M&S funds for the experiment. The costs include approximately \$10K for PMT modules, \$10K for mechanical hardware, \$9K for optical components, and \$1K for electronics for a total of \$30K. In addition, a 50% contingency fund is to be made available after prompt notification to the division that such funds will be needed and such need is justified.

## The PPD Mechanical team of John Korienek and Carl Lindenmeyer will be responsible for the design, fabrication, and installation of the laser box, PMT box, plunger, and interfaces between these items and the warm bore installed in the Tevatron magnet. Some of the pieces will require machine shop and welding workmanship.

4.2.3 The PPD Electrical Engineering Department will be responsible for
providing engineering and technical support of the data acquisition
system. This will include the use of QuarkNet board prototypes and
modifications to these printed circuit boards. This effort will be led
by Sten Hansen with technical assistance. The department will also
provide support for software engineering by Al Baumbaugh who will write
the graphical user interface and underlying software for the control of
the experiment. Additional support will be provided for electrical parts
of the safety system.

4.2.4 The PPD shall provide access to a Continuum Surelite Laser
(currently under Hogan Nguyen's care) as a back-up to the accelerator
division laser.

4.2.5 The PPD ES&H Department will assist in all of the necessary safety
reviews.

4.2.6 The PPD will provide administrative support through the Experiment
Physics Projects office.

4.2.S Summary of Particle Physics Division costs:

Type of Funds Equipment Operating Personnel

(person-weeks)

Mechanical design and fabrication 8.0 tech

Electrical engineering support 4.0 engineer

Machine shop fabrication 1.0 tech

Administrative Support 1.0

Mechanical pieces \$10K

Optical components \$9K

PMTs \$10K

Electronics \$1K

Total new items \$30K 14.0

## Fermilab Technical Division 

## 

## The Technical Division will be responsible for the operation of the Tevatron dipole magnet on the test stand at MTF. This includes the installation of the magnet onto the test stand and the connections to the feed and return cans for cryogenic operation. Technical Division personnel will operate and monitor the magnet. These activities will be considered as MFT Test Stand operations and will not be directly charged towards the GammeV effort. The Technical Division will make the space on Test Stand 6 available to the project for the duration of the effort. It is understood that there may be circumstances for which higher priority activities may take precedence over GammeV and the schedule and even the experiment's priority on Test Stand 6 may be adjusted in order to take into account these priorities. 

1.  The Technical Division will supply power and cryogens necessary for
    the operation of the magnet throughout the duration of the project.

2.  The Technical Division will provide limited technical assistance to
    PPD personnel who have the responsibility for the installation of
    the experiment and interfacing it with the magnet. The experimenters
    estimate the total involvement of **G**amme**V** specific technical
    support to total 1 person week.

3.  The TD ES&H Department will assist in all of the necessary safety
    reviews.

4.  The Technical Division will provide a nominal 5T (5100 amps) field
    with normal stability controls in place and will provide current and
    other routine monitoring data to the experimenters. The Technical
    Division will provide 120 hours of magnetic field to the
    experimenters usually in continuous duration of 4-10+ hours although
    short interruptions and durations as short as 1-2 hours are
    acknowledged as being acceptable by the experimenters. Because of
    priorities, the Technical Division can choose these hours during
    weekend or swing shift times if necessary. The Technical Division
    will consider a possible request for additional hours beyond 120
    hours within the context of this MOU in the event that the
    experimenters require further investigations of a possible signal.

4.3.S Summary of Technical Division costs:

Type of Funds Equipment Operating Personnel

(person-weeks)

Total new items \$0.0K \$0K 1.0

2.  Fermilab Computing Division

    1.  The Computing Division will provide support for web space and a
        document database and similar support normally made available to
        experimenters. The experimenters will be responsible for
        maintaining the web space and document database.

    2.  The Computing Division will provide other support as needed
        including PREP with the understanding that the experimenters
        will follow the terms described below under Special
        Considerations for the prompt return of any required modules.

4.4.S Summary of Computing Division costs:

Type of Funds Equipment Operating Personnel

(person-weeks)

Total new items \$0.0K \$0K 0.2

3.  Fermilab Workforce Development and Resources Section

    1.  The Workforce Development and Resources Section will provide use
        of QuarkNet data acquisition boards for use by the experiment.
        These will be returned to the Education Office after the project
        is completed.

4.5.S Summary of Workforce Development and Resources Section costs:

Type of Funds Equipment Operating Personnel

(person-weeks)

Total new items \$0.0K \$0K 0.0

4.  Fermilab ES&H Section

    1.  The ES&H Section will provide assistance with safety reviews and
        safety approvals in order to help insure the experiment will be
        conducted in a safe manner.

# **V. Summary of Costs**

**Source of Funds \[\$K\] Equipment Operating Personnel**

(person-weeks)

Particle Physics Division \$30K \$0.0K 14

Accelerator Division 0 0 8

Computing Division 0 0 0.2

Technical Division 0 0 1

Workplace Development Section 0 0 0

ES&H Section 0 0 0

Totals Fermilab \$30.0K \$0.0K 23.2

Totals Non-Fermilab \$0K

# 

# **VI. SPECIAL CONSIDERATIONS**

6.1 The responsibilities of the **G**amme**V** Spokespersons and
procedures to be followed by experimenters are found in the Fermilab
publication \"Procedures for Experimenters\" (PFX)
([http://www.fnal.gov/directorate/documents/index.html)](http://www.fnal.gov/directorate/documents/index.html).
The Physicists in charge agree to those responsibilities and to follow
the described procedures.

6.2 To carry out the experiment a number of Environmental, Safety and
Health (ES&H) reviews are necessary. This includes creating a Partial
Operational Readiness Clearance document in conjunction with the
standing Particle Physics Division committee. The **G**amme**V**
Spokespersons will follow those procedures in a timely manner, as well
as any other requirements put forth by the division's safety officer.

6.3 All regulations concerning radioactive sources will be followed. No
radioactive sources will be carried onto the site or moved without the
approval of the Fermilab ES&H section.

6.4 All items in the Fermilab Policy on Computing
([http://computing.fnal.gov/cd/policy/cpolicy.pdf)](http://computing.fnal.gov/cd/policy/cpolicy.pdf)

will be followed by experimenters.

6.5 The **G**amme**V** Spokespersons will undertake to insure that no
PREP and computing equipment be transferred from the experiment to
another use except with the approval of and through the mechanism
provided by the Computing Division management. They also undertake to
insure that no modifications of PREP equipment take place without the
knowledge and consent of the Computing Division management.

6.6 Each institution will be responsible for maintaining and repairing
both the electronics and the computing hardware supplied by them for the
experiment. Any items for which the experiment requests that Fermilab
performs maintenance and repair should appear explicitly in this
agreement.

6.7 If the experiment brings to Fermilab on-line data acquisition or
data communications equipment to be integrated with Fermilab owned
equipment, early consultation with the Computing Division is advised.

6.8 At the completion of the experiment:

6.8.1 The **G**amme**V** Spokespersons are responsible for the return of
all PREP equipment, Computing equipment and non-PREP data acquisition
electronics. If the return is not completed after a period of one year
after the end of running the **G**amme**V** Spokespersons will be
required to furnish, in writing, an explanation for any non-return.

6.8.2 The experimenters agree to remove their experimental equipment as
the Laboratory requests them to. They agree to remove it expeditiously
and in compliance with all ES&H requirements, including those related to
transportation. All the expenses and personnel for the removal will be
borne by the experimenters.

6.8.3 The experimenters will assist the Fermilab Divisions and Sections
with the disposition of any articles left in the offices they occupied,
including computer printout and magnetic tapes.

6.8.4 An experimenter will report on the test effort at a Fermilab All
Experimenters Meeting.

**SIGNATURES:**

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ / /
2007

Aaron Chou (co-PI), Fermilab

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ /2007

William Wester (co-PI), Fermilab

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2007

Greg Bock, Particle Physics Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2007

Roger Dixon, Accelerator Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2007

Victoria White, Computing Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2007

Victor Yarba, Technical Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2007

Marjorie Bardeen, Workforce Development and Resources Section

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2007

William Griffing, ES&H Section

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ /2007

Hugh Montgomery, Associate Director, Fermilab

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ /2007

Stephen Holmes, Associate Director, Fermilab

**APPENDIX I - Hazard Identification Checklist**

Items for which there is anticipated need have been checked

<table style="width:100%;">
<colgroup>
<col style="width: 4%" />
<col style="width: 5%" />
<col style="width: 2%" />
<col style="width: 20%" />
<col style="width: 4%" />
<col style="width: 5%" />
<col style="width: 5%" />
<col style="width: 17%" />
<col style="width: 5%" />
<col style="width: 28%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="4"><strong>Cryogenics</strong></td>
<td colspan="4"><strong>Electrical Equipment</strong></td>
<td colspan="2"><p><strong>Hazardous/Toxic</strong></p>
<p><strong>Materials</strong></p></td>
</tr>
<tr class="even">
<td><strong>X</strong></td>
<td colspan="3">Beam line magnets</td>
<td><strong>X</strong></td>
<td colspan="3">Cryo/Electrical devices</td>
<td></td>
<td>List hazardous/toxic materials</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3">Analysis magnets</td>
<td></td>
<td colspan="3">capacitor banks</td>
<td></td>
<td>planned for use in a beam line or experimental enclosure:</td>
</tr>
<tr class="even">
<td></td>
<td colspan="3">Target</td>
<td><strong>X</strong></td>
<td colspan="3">high voltage</td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3">Liquid Argon TPC</td>
<td></td>
<td colspan="3">exposed equipment over 50 V</td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td colspan="4"><strong>Pressure Vessels</strong></td>
<td colspan="4"><strong>Flammable Gases or Liquids</strong></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td colspan="3"></td>
<td>inside diameter</td>
<td colspan="2">Type:</td>
<td colspan="2"></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td colspan="3"></td>
<td>operating pressure</td>
<td colspan="2">Flow rate:</td>
<td colspan="2"></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td colspan="3"></td>
<td>window material</td>
<td colspan="2">Capacity:</td>
<td colspan="2"></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td colspan="3"></td>
<td>window thickness</td>
<td colspan="4"><strong>Radioactive Sources</strong></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td colspan="4"><strong>Vacuum Vessels</strong></td>
<td></td>
<td colspan="3">permanent installation</td>
<td colspan="2"><strong>Target Materials</strong></td>
</tr>
<tr class="even">
<td colspan="3"><strong>1 ½” - 2”</strong></td>
<td>inside diameter</td>
<td></td>
<td colspan="3">temporary use</td>
<td></td>
<td>Beryllium (Be)</td>
</tr>
<tr class="odd">
<td colspan="3"><strong>Atm–10-8 torr</strong></td>
<td>operating pressure</td>
<td colspan="3">Type:</td>
<td></td>
<td></td>
<td>Lithium (Li)</td>
</tr>
<tr class="even">
<td colspan="3"><strong>Glass BK7</strong></td>
<td>window material</td>
<td colspan="3">Strength:</td>
<td></td>
<td></td>
<td>Mercury (Hg)</td>
</tr>
<tr class="odd">
<td colspan="3"><strong>3/8” + 1/2”</strong></td>
<td>window thickness</td>
<td colspan="4"><strong>Hazardous Chemicals</strong></td>
<td></td>
<td>Lead (Pb)</td>
</tr>
<tr class="even">
<td colspan="4"><strong>Lasers</strong></td>
<td></td>
<td colspan="3">Cyanide plating materials</td>
<td></td>
<td>Tungsten (W)</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3">Permanent installation</td>
<td></td>
<td colspan="3">Scintillation Oil</td>
<td></td>
<td>Uranium (U)</td>
</tr>
<tr class="even">
<td><strong>X</strong></td>
<td colspan="3">Temporary installation</td>
<td></td>
<td colspan="3">PCBs</td>
<td></td>
<td>Other :</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3">Calibration</td>
<td></td>
<td colspan="3">Methane</td>
<td colspan="2"><strong>Mechanical Structures</strong></td>
</tr>
<tr class="even">
<td><strong>X</strong></td>
<td colspan="3">Alignment</td>
<td></td>
<td colspan="3">TMAE</td>
<td><strong>X</strong></td>
<td>Lifting devices</td>
</tr>
<tr class="odd">
<td colspan="2">Type:</td>
<td colspan="2"><p>Continuum Surelite</p>
<p>Nd:Yag</p></td>
<td></td>
<td colspan="3">TEA</td>
<td></td>
<td>Motion controllers</td>
</tr>
<tr class="even">
<td colspan="2">Wattage:</td>
<td colspan="2">9W, 420mJ/5ns @ 20 Hz</td>
<td></td>
<td colspan="3">photographic developers</td>
<td></td>
<td>scaffolding/elevated platforms</td>
</tr>
<tr class="odd">
<td colspan="2">class:</td>
<td colspan="2">IV</td>
<td></td>
<td colspan="3">Other:</td>
<td></td>
<td>Others</td>
</tr>
</tbody>
</table>

**APPENDIX II Laser Hazard Requirements**

All personnel on the project who deal with the laser will be required to
go through safety training suitable for the Class IV status of the
laser.

Further information from Ray Tomlin follows:

The people that oversee safety in Accelerator Division laser labs are
listed here.

Ray Lewis, Mike Bonkalski. Also, Tim Miller has a nice web page:

<http://www-esh.fnal.gov:8001/Laser_Safety/Laser_Safety_files/frame.htm>

Lab laser safety guidelines are here:

<http://www-esh.fnal.gov:8001/Laser_Safety/Laser_Safety_files/frame.htm>

Ray Tomlin operates the LINAC laser labs in AD and has been even more
conservative than the ES&H folks striving for zero exposure if possible.

Rich Ruthe (TD, SSO) has attended the class 4 laser committee meetings
sponsored by Tim Miller so he has had at least indirect input on the
operation of this laser and all the class 4 lasers on site.

The laser to be used for the **G**amme**V** experiment is a Continuum
SureLite I-20. It fires a 420 milli joule, 5nsec pulse at 20 Hz. Wave
length is 1064 nm, in the near IR, and invisible. Average power is 9 to
10 watts of photons. The laser outputs 160 mJ at 20 Hz when frequency
doubled to 532nm.

This laser has been in two laser labs run by Ray Tomlin. It has been in
service in the pre-accelerator. While in the pre-accelerator, it was
enclosed in a metal box. Passers-by could reach out and touch the box.
The box was light tight and covers were interlocked. Since the IR beam
was fired into the H- beam line, interlocks included vacuum valve
status, vacuum level status, PREAC HV status, in addition to the
microswitches on the laser box covers.

**APPENDIX III Cryogenic and Electronics Hazard Requirements**

The **G**amme**V** will use cryogens (liquid N~2~ and He) as they are
used for magnet operations by the Magnet Test Facility within the
Technical Division. TD specified safety procedures will be followed. The
electronics equipment is modest with no exposed high voltages. Circuitry
will be appropriately fused and protected as required by safety
concerns.

**APPENDIX IV RUN PLAN.**

1\) Rigging, installation, setup May 1 -- June 1, 2007

2\) Alignment and Calibration at MFT June 1 - June 15, 2007

3\) PMT tube commissioning June 15 -- June 22, 2007

4\) Data taking June 22 - July 15, 2007

5\) Optional running time if needed July 15 -- July 31, 2007