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

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

**MEMORANDUM OF UNDERSTANDING**

**FOR THE 2005 MESON TEST BEAM PROGRAM**

**T951**

**ALICE Electromagnetic Calorimeter Prototype Test**

September, 2005

INTRODUCTION 3

I. PERSONNEL AND INSTITUTIONS: 5

II\. EXPERIMENTAL AREA, BEAMS AND SCHEDULE CONSIDERATIONS 5

III\. RESPONSIBILITIES BY INSTITUTION - NON FERMILAB 7

IV\. RESPONSIBILITIES BY INSTITUTION - FERMILAB 7

4.1 Fermilab Accelerator Division 7

4.2 Fermilab Particle Physics Division 7

4.3 Fermilab Computing Physics Division 8

4.4 Fermilab ES&H Section 8

V. Summary of Costs 8

VI\. SPECIAL CONSIDERATIONS 9

SIGNATURES 10

appendix i - Appendix II - prep equipment pool needs 11

APPENDIX II - Hazard Identification Checklist 12

INTRODUCTION

This Memorandum of Understanding between the Test Beam collaborators and
Fermilab is for the use of beam time at Fermilab during the Fall, 2005
Meson Test Beam Run. The experimenters plan to measure the energy,
position, and time resolution of prototype modules of a large
electromagnetic calorimeter proposed to be installed in the ALICE
experiment at the LHC. The ALICE experiment is one of the three large
approved LHC experiments, with ALICE placing special emphasis on the LHC
heavy-ion program. The large electromagnetic calorimeter (EMCal) is a US
initiative that is endorsed by the ALICE collaboration and is currently
in the early stages of review by the Nuclear Physics Division of the
DOE. The installation in the test beam at FNAL and test beam
measurements will be carried out by the US members of the ALICE
collaboration (ALICE-USA).

The overall design of the ALICE EMCal is heavily influenced by its
location within the ALICE L3 magnet. The EMCal is to be located inside
the large room temperature magnet within a cylindrical integration
volume approximately 112cm deep, by 5.6m in length, sandwiched between
the ALICE TPC space frame and the L3 magnet coils. The chosen technology
is a layered Pb-scintillator sampling calorimeter with a longitudinal
pitch of 1.6mm Pb and 1.6mm scintillator. The full detector spans -0.7
to with an azimuthal acceptance of = 120^o^. The EMCal readout is of a
"Shish-Kabob" type similar to the PHENIX Pb-scintillator sampling
calorimeter[^1] in which the scintillation light is collected via
wavelength shifting fibers running through the Pb-scintillator tiles
perpendicular to the front surface. The detector is segmented into
\~14000 towers.

  ------------------------------------ ----------------------------------
  **Quantity**                         **Value**

  Sampling Ratio, d~Pb~/d~Sc~          1.6 mm Pb / 1.6mm Scintillator

  Sampling Fraction, f~s~=E~Sc~/E~Pb~  0.0811 (including all materials)

  Total depth                          24.8 cm

  Number of Pb/Sc cells                78

  Number of Radiation Lengths          22.3

  Module Size                          12.7 X 12.6 X 31 cm^3^

  Tower Size (at eta=0)                x = 0.015 x 0.015

  Number of Towers                     13,824

  Number of Modules                    12x12x24=3456

  Number of Supermodules               12

  Weight of Supermodule                \~9.6 tons

  Total Coverage                       = 120^o^, -0.7 \< \< 0.7
  ------------------------------------ ----------------------------------

**Table 1.** The ALICE EMCal characteristics.

The basic structural units of the calorimeter are supermodules, each
subtending approximately \~20 in and 0.7 units in . Supermodules are
assembled from individual modules. The modules are further segmented
into 2x2 individually read out towers. The fibers from an individual
tower are grouped together to form readout tower bundles. These are each
optically coupled to an avalanche photodiode (APD) via a short
lightguide to provide some spatial optical mixing and to match the fiber
bundle to the APD. The module assembly is indicated in Figure 1. The
supermodules weigh about 9.6 tons and are the basic units handled during
installation. Each supermodule is roughly 145cm wide at the front
surface by 350cm long with an active depth of 24.5cm (at =0) plus an
additional 6.6 cm of depth in structural plates. The physical
characteristics of the ALICE EMCal are summarized in Table 1.

![](media/image2.png){width="6.6097222222222225in"
height="3.282638888888889in"}

**Figure 1.** An EMCal module (2x2 readout towers).

The EMCal test beam measurements at FNAL will utilize a stacked 4x4
array of prototype EMCal modules (8x8 towers). All towers will be
instrumented with the same model APD and preamplifier as will be used in
the ALICE experiment and all channels will be readout with existing
prototype front end electronics intended for use in ALICE. The goals of
the test beam measurements are: To investigate the energy resolution,
linearity, uniformity, and position resolution, using electron beams; To
study the energy dependence of the response to electrons and hadrons to
determine the particle identification capabilities of the EMCal by
shower shape; And to investigate the timing characteristics of the
energy signal for crude time-of-flight measurement (\~1ns) for use for
anti-neutron rejection. Measurements will be made for comparison with
different signal shaping times in the front end electronics.

This is a memorandum of understanding between FNAL and the ALICE EMCal
group. This memorandum is intended solely for the purpose of providing a
work allocation for FNAL and the ALICE EMCal group. It reflects an
arrangement that is currently satisfactory to the parties involved. It
is recognized, however, that changing circumstances of the evolving
research program will necessitate revisions. The parties agree to
negotiate amendments to this memorandum to reflect such revisions.

# **I. PERSONNEL AND INSTITUTIONS:**

Spokesman and physicist in charge of

beam tests: Terry Awes, Oak Ridge National Laboratory

Fermilab liaison: Erik Ramberg

The ALICE EMCal group members and others who may participate in the test
beam measurements are:

1.  University of California - Berkeley: H.Crawford, E.Judd

2.  University of California -- Los Angeles: V.Ghazikhanian, H.Huang,
    S.Trentalage, C.Whitten

3.  Creighton University: M.Cherney, J.Seger

4.  University of Houston: A.Lan, A.Mairani, B.Mayes, L.Pinsky

5.  Lawrence Berkeley National Laboratory: P.Jacobs, M.v.Leeuwen,
    G.Odyniec, J.Putschke, H.G.Ritter

6.  Lawrence Livermore National Laboratory: J.Klay, R.Soltz

7.  Michigan State University: A.Vander Molen, G.Westfall

8.  Oak Ridge National Laboratory: T.Awes, V.Cianciolo, D.Silvermyr,
    P.Stankus, G.Young,

9.  Ohio State University: T.Humanic, I.Kotov, M.Lisa, B.Nilsen,
    D.Truesdale

10. Purdue University: O.Baranikova, A.Hirsch, R.Scharenberg, F.Wang

11. University of Tennessee: Y.Efremenko, K.Read, S.Sorensen

12. University of Washington: H.Bichsel, J.Cramer

13. Wayne State University: T.Cormier, A.Mischke, A.Pavlinov, V.Petrov,
    C.Pruneau, J.Riso

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

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1.  LOCATION

    1.  The experiment is to take place in the MTEST beam line and
        located in the area designated MT6-B3. In addition, the main
        control room to the west of the MTEST line will be used to house
        electronics (NIM, CAMAC, VME, oscilloscope, and computer), and
        to provide work space.

2.  BEAM

    1.  The tests will use slow resonantly-extracted, Main Injector
        proton beam focused onto the MTest target. The tests require
        mixed beams with good particle identification (e/pi/p
        discrimination) over the full range of available momenta (4-66
        GeV).

    2.  Resolution: A beam momentum selection with a momentum bite of
        p/p\~2% or less is highly desirable. Alternatively, an accurate
        estimate of the momentum resolution of the test beam at each
        momentum setting would be needed.

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    2.  Intensity: In the range of 0.2-10 KHz in an area of
        approximately 1 square cm, with the rates dependent on momentum.
        With the current beam line design this is expected to require up
        to 2 x 10^12^ primary protons per spill. The beam needs to be
        able to be steered into the middle of a 6 in diameter circle.

3.  SETUP

    1.  For the test measurements an array of 4x4 EMCal modules (8x8
        towers) will be used. For handling and stacking purposes the
        modules will be assembled on a strong-back in strip units of
        four modules, each strip unit weighing approximately 300 pounds
        with approximate dimensions of 12 x 50 x 50 cm. The strip units
        will be lifted from packing crates at floor level onto the table
        in the test beam by means of a commercial, manual hydraulic
        "cherry picker" rated at 1.5 tons. The hydraulic lift will be
        provided by the EMCal group if the equivalent is not available
        from Fermilab. The strip units will be stacked and strapped
        together to form the array of 4x4 EMCal modules. The modules
        will be stacked on top of a thin "lazy-susan" bearing system
        sitting on top of a moveable platform, to allow the EMCal
        response dependence on the angle of incidence to be
        investigated. The moveable platform will consist of a heavy duty
        horizontal slider/table presently available in the test beam
        area, provided by Fermilab. Vertical motion will be provided by
        a commercial scissors table (Southworth model LL1.5) with 1500
        pound capacity provided by the EMCal group. The required total
        range of both horizontal and vertical adjustment is
        approximately 50cm. The size of the stacked array is \~51x51x50
        cm with a weight of about 1200lbs (\~75lbs/module). The EMCal
        readout electronics will be attached to the back of the array of
        modules. An access space of about \~1m behind the EMCal array is
        needed for installation and access to the electronics. With the
        moveable platform, the EMCal array can be moved out of the beam
        if necessary to accommodate downstream users.

    2.  Use of a beam Cerenkov counter is needed for electron/pion
        discrimination (and pion/proton discrimination if more than one
        Cerenkov counter can be used).

    3.  A pair of scintillator paddles, one immediately in front of the
        EMCal and one far upstream will be used for beam definition and
        timing. A counter to provide x-y position measurement with \~1
        mm position resolution will be located immediately in front of
        the EMCal.

4.  SCHEDULE

    1.  The intention is to install the EMCal prototype in the test
        beam, complete the measurements, and remove the prototype, in
        the shortest time period possible. We anticipate that this could
        optimistically be completed in a time period of \~3 weeks with
        steady availability and control of the test beam. The preferred
        time period is November, 2005.

    2.  Details of the measurement plan: 2-3 days of physical setup in
        the test beam. 3-4 days of setup and debugging of readout of
        EMCal and associated beam trigger counters. Then 1) 1-2 days for
        gain-matching scan with \~10 GeV/c electrons through all 64
        towers (\~1000 e /tower). 2) 1 day for Momentum scan with
        electrons to investigate linearity and energy and position
        resolution. 3) 3 days to repeat 1-2) with alternative
        electronics shaping time. 3) 2 days for detailed position and
        angle of incidence scan with \~10 GeV/c electrons to investigate
        uniformity of response. 4) 3 days for high statistics
        momentum/position/angle scans with e/pi/p to investigate
        particle identification by shower shape. 5) 1 day with thick C
        target in beam just upstream of the EMCal as neutral pion
        production source via charge exchange reaction to study
        energy-position resolution via neutral pion invariant mass
        reconstruction.

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

1.  The EMCal modules and all of its associated readout electronics will
    be brought by the ALICE EMCal group.

2.  The array of EMCal prototype modules will be assembled and
    disassembled on the moveable platform by members of the EMCal group.

3.  The DAQ computer will be provided by the EMCal group.

4.  ALICE test beam users will ensure that safe lifting practices are
    used in the installation of calorimeter modules, including having a
    minimum of 2 people involved and making sure that no installer has a
    pre-existing condition that would preclude them from lifting the
    required weight.

    **IV. RESPONSIBILITIES BY INSTITUTION - FERMILAB**

## 4.1 Fermilab Accelerator Division:

1.  Use of MTest beam.

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1.  Maintenance of all existing standard beam-line elements such as
    SWICs, loss monitors, instrumentation, controls, clock distribution
    and power supplies.

2.  Beam controls console and remote data logging capability (ACNET)

3.  Reasonably rapid access to our equipment in the test beam. Such
    access is anticipated to be less than once per hour, typically more
    like once per shift.

4.  Logic signal at experimenter electronics racks that has a constant
    phase (within 1-2 ns in a given hour) with respect to the arrival of
    beam buckets at the test apparatus.

5.  No experiment-owned devices need interfacing to the Accelerator
    Division control system.

6.  Position and focus of the beam on the experimental devices under
    test will be under control of MCR. Control of secondary devices that
    provide these functions may be delegated to the experimenters as
    long as it does not violate the Shielding Assessment or provide
    potential for significant equipment damage.

7.  The integrated effect of running this and other SY120 beams will not
    reduce the antiproton stacking rate or protons on target for the
    neutrino program by more than 5% globally, with the details of
    scheduling to be worked out between the experimenters and the Office
    of Program Planning.

## Fermilab Particle Physics Division

##  

1.  The test-beam efforts in this MOU will make use of the Meson Test
    Beam Facility. Requirements for the beam and user facilities are
    given in Section 2. The Fermilab Particle Physics Division will be
    responsible for coordinating overall activities in the MTest
    beam-line, including use of the user beam-line controls, readout of
    the beam-line detectors, and MTest gateway computer.

2.  Maintenance of detector elements in the beamline used to trigger on
    beam (scintillators, Cerenkov counters, MWPC, etc.)

3.  A horizontal moveable platform with remote control and readout will
    be provided for mounting the EMCal in the test beam. An engineering
    assessment of this platform will be done by the PPD. (0.5
    person-weeks)

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8.  Initial assistance with operation and readout of all beam trigger
    counters will be provided to the ALICE EMCal group. (0.5
    person-weeks)

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3.  Fermilab Computing Division

    1.  The ALICE EMCal group will supply all needed computer equipment.

    2.  FNAL will provide Ethernet access in the counting house with
        access to a printer.

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4.  Fermilab ES&H Section

    1.  We will require assistance with safety reviews.

# 

# **V. Summary of Costs**

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

(person-weeks)

Accelerator Division \$0K \$0K 0

Particle Physics Division 0 0 1.0

Computing Division 0 0 0

Totals Fermilab \$0K 0 1.0

# 

# **VI. SPECIAL CONSIDERATIONS**

6.1 The responsibilities of the spokesman of the ALICE EMCal test group
and the procedures to be followed by experimenters are found in the
Fermilab publication \"Procedures for Experimenters\"
(<http://www.fnal.gov/directorate/documents/index.html>). The spokesman
agrees 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 spokesman of the ALICE
EMCal test group will follow those procedures in a timely manner, as
well as any other requirements put forth by the division's safety
officer.

6.3 The spokesman of the ALICE EMCal test group will ensure that at
least one person is present at the Meson Test Beam Facility whenever
beam is delivered and that this person is knowledgeable about the
experiment's hazards.

6.4 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.

6.5 All items in the Fermilab Policy on Computing will be followed by
experimenters. (<http://computing.fnal.gov/cd/policy/cpolicy.pdf>).

6.6 The spokesman of the ALICE EMCal test group will undertake to ensure
that no PREP or 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
ensure that no modifications of PREP equipment take place without the
knowledge and consent of the Computing Division management.

6.7 The ALICE EMCal test group 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.

6.8 At the completion of the experiment:

6.8.1 The spokesman of the ALICE EMCal test group is 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 spokesman of the ALICE EMCal
test group 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 beam effort at a Fermilab
All Experimenters Meeting.

**SIGNATURES:**

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ / /
2005

Terry Awes, Oak Ridge National Laboratory

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2005

Jim Strait, Particle Physics Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2005

Roger Dixon, Accelerator Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2005

Robert Tschirhart, Computing Division

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ / 2005

William Griffing, ES&H Section

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ /2005

Hugh Montgomery, Associate Director, Fermilab

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/ /2005

Steven Holmes, Associate Director, Fermilab

#  **Appendix I --** ALICE Electromagnetic calorimeter test **-- Equipment pool needs**

Equipment Pool items needed for Fermilab test beam. All items related to
implementation of trigger logic and readout of beam line counters:

[Description]{.underline}

A\) NIM crate, with cooling fans, with NIM modules for beam trigger
logic.

B\) CAMAC crate and power supply, with CAMAC modules for readout of beam
counters.

**APPENDIX II - 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></td>
<td colspan="3">Beam line magnets</td>
<td></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 (1000V at 1.0A max)</td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3">Bubble chamber</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"></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"></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"></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"></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></td>
<td colspan="3">Temporary installation</td>
<td></td>
<td colspan="3">PCBs</td>
<td><strong>X</strong></td>
<td>Other : <strong>Iron (Fe)</strong></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></td>
<td colspan="3">Alignment</td>
<td></td>
<td colspan="3">TMAE</td>
<td>X</td>
<td>Lifting devices</td>
</tr>
<tr class="odd">
<td colspan="2">type:</td>
<td colspan="2"></td>
<td></td>
<td colspan="3">TEA</td>
<td><strong>X</strong></td>
<td>Motion controllers</td>
</tr>
<tr class="even">
<td colspan="2">Wattage:</td>
<td colspan="2"></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"></td>
<td></td>
<td colspan="3">Other: Activated Water?</td>
<td></td>
<td>Others</td>
</tr>
</tbody>
</table>

[^1]: L. Aphecetche et al. (PHENIX), Nucl. Instrum. Meth**. A499**, 521
    (2003).