Comments on Neutrino Beam Devices Review

**November 18, 2002**

# Overview

# Presenter: J. Hylen

1.  ([Reviewer: F. Nezrick]{.underline}) Concerning all cable
    applications underground, care must be taken that only approved fire
    retardant cables are used in the design and implementation of
    systems.

2.  ([Reviewer: F. Nezrick]{.underline}) Much instrumentation is yet to
    be designed, see Hylen pgs 5 & 6. This work should be expedited.

3.  ([Reviewer: B. Ducar]{.underline}) Although from a different WBS, it
    would have been nice to include a summary of requirements for the
    Horn Power Supply. This supply is being interfaced largely through
    an IRM in accord with similar design efforts and implementation at
    MiniBooNE for their horn supply.

4.  ([Reviewer: B. Ducar]{.underline}) Magnesium oxide was mentioned
    briefly in the discussion of cables in high radiation areas. Sacha
    Kopp at UTA has made some investigation of MgO cabling in
    implementing detectors at the absorber area. He should be contacted
    to see if his knowledge would be of any benefit to target hall
    applications.

# Electronics Channels

[Presenter: R. Talaga]{.underline}

1.  ([Reviewer: F. Nezrick]{.underline}) It is important that for each
    instrument in the target hall we specify the dynamic range, accuracy
    required and expected error of the measurement. The Instrumentation
    List (Talaga pg 10) is a good first pass. It should be completed and
    possibly used as a reference in determining adequacy of the
    functionality of the instrumentation.

2.  ([Reviewer: F. Nezrick]{.underline}) The NuMI experimenters should
    have access to analogue signals so that they can easily confirm that
    the proton beam arrives at the target during the horn current
    maximum and be able to determine that time relative to the
    experimental trigger.

3.  ([Reviewer: F. Nezrick]{.underline}) To indicate the target
    colliding with horn 1 an impedance measurement is being considered,
    i.e. a short between the two indicated a collision. A proximity
    detector might be considered which could indicate a pending
    collision, e.g. a measure of relative capacitance between target and
    horn.

4.  ([Reviewer: F. Nezrick]{.underline}) For the motor controls, has the
    failure modes of the limit switches been included in the design?
    Redundant switches are proposed-- is that sufficiently safe or the
    best solution.

5.  ([Reviewer: F. Nezrick]{.underline}) I really like the idea of a
    prototype data collection system installed in MI8 during the summer
    of 2003. This would allow testing of the long term stability of the
    instrumentation.

6.  ([Reviewer: B. Ducar]{.underline}) Being responsible for Controls
    implementation, I found Rich Talaga's summary of ACNET data
    especially useful. I expect at least one, 64 channel, 14 bit
    resolution MADC to be located in the Power Supply Support Room area.
    It would be helpful to indicate which of the "AEB" signals are
    especially important to monitor in terms of the available
    resolution. These selected signals might be indicated for twinax
    connection (MADC differential input) as opposed to BNC.

7.  ([Reviewer: L. Hammond]{.underline}) Provide double thermocouples
    where they are imbedded in inaccessible locations, for temperature
    verification and in case of premature thermocouple failure. Target
    Pile Thermocouple list description seems to indicate more than 8
    total locations.

8.  ([Reviewer: L. Hammond]{.underline}) Make sure the compressor
    capacity control matches the turn down steps of the multiple
    evaporator controls.

9.  ([Reviewer: B. Kramper]{.underline}) Signals which must be available
    at multiple points need to be identified and routed accordingly.
    Types of front ends for Acnet (CAMAC, stepper motor, PLC interface,
    IRM, etc.) need to be identified and located for ethernet access.

10. ([Reviewer: B. Kramper]{.underline}) Alarm monitoring frequencies
    need to be determined so that Acnet can respond.

11. ([Reviewer: B. Kramper]{.underline}) Motion control interlock to
    prevent target from colliding with Horn 1 needs to be researched so
    that any control modifications can be made if necessary.

# Cross Hair System

[Presenter: D. Ayres]{.underline}

1.  ([Reviewer: F. Nezrick]{.underline}) The design of the mounting
    system for the alignment cross-hairs should include consideration of
    fatigue failure by vibrations induced by horn pulsing.

# Recirculating Air System Controls

[Presenter: A. Stefanik]{.underline}

1.  ([Reviewer: F. Nezrick]{.underline}) Has a failure mode analysis
    been performed for the Target Pile Air Cooling System? For example
    what are the software defaults after a power failure.

2.  ([Reviewer: B. Ducar]{.underline}) Ambient conditions in the target
    hall during construction remain an on-going concern. The air flow
    system ably designed by Andy Stefanik may be able to mitigate some
    adverse conditions after installation but before running with beam.
    Remain alert to this possibility as installation commences.

3.  ([Reviewer: L. Hammond]{.underline}) Will you monitor dewpoint
    temperature in the hall to make sure that no components get into
    possible condensation trouble?

4.  ([Reviewer: L. Hammond]{.underline}) Reheat control should be SCR
    type capable of fine temperature control as opposed to large steps.

*Note: A. Para, R. Ford, and A. Legan are also listed as reviewers, but
no comments are posted for them.*