sPHENIX tracking discussion

[Thomas K Hemmick <hemmick AT skipper.physics.sunysb.edu>]

Hi Ed

I've converted the text that I sent you in an earlier mail into powerpoint.  To try and save you a little time, I used a template that I stole from an earlier presentation of yours.  Please note that we have TWO cost estimates in this document for module HV.  One of these takes the ALICE TDR (2014) and scales their estimate of $200,000 CHF into dollars and then scales by the different number of modules we have as compared to them.  The other one uses a quote from CAEN that Bob Azmoun managed to get tonight as a personal favor from Marco.  The quote was made for a different assumption (more than one chain runs from one HV source) and so that fact that these two totals agree is NOT because the original ALICE estimate holds up but really reflects our running more than one stack per HV output (which is a bit risky).  However Marco DOES state in his Email that this fast quote does not yet reflect discounts that he expcts would apply.  This is really the best we can do in one evening...

BTW-- None of the fancy HV makers (CAEN, WEINER) have 50 kV power supplies available on their web sites (and Marco says that CAEN does not make these).  But DUH(!!) we're swimming in these kind of power supplies at SBU since we dismantled the beam lines in the target hall.  We can easily donate the same 80 kV HV power supply that we used for testing HVPF material (and planned to use for testing the field cage) to sPHENIX.  (Note that this is probably only a $5-10k savings)

Tom

On Wed, Sep 7, 2016 at 10:11 PM, Lynch, Don <dlynch AT bnl.gov> wrote:

Hi Ed,

Homework assignment:

"Please present your current plans and understanding of tracker integration and commissioning and how this dovetails with the total detector integration.  (John H, Don, Jim)"

I address the mechanical integration, installation and commissioning of mechanical systems. John, Eric or Steve should address the electronics and DAQ integration and commissioning.

Our understanding of the tracker integration and commissioning is as follows:

1. BNL sets the outline (limiting) dimensions for the 3 tracker subsystems to include stay clear space between detectors. These are to be recorded in an outline drawing for each subsystem (already existing for TPC) not yet finalized for MAPS and INTT.

2. Subsystem groups will provide sPHENIX project engineers with specs for cables (sizes and quantity), cooling requirements, and other services (gas, etc.). sPHENIX project engineering will implement these requirements, provide space and routing of services, piping and cabling including cable trays, structural supports for services, racks and space allocation on sPHENIX carriage platforms.

3.  SPHENIX project engineering will design and provide structural support for the physical detectors with positioning and alignment provisions for the carriage and magnet in accordance with sPHENIX project parameters, and will coordinate with subsystems groups to design local alignment and positioning of the  tracker subsystems integrated with subsystem groups designed mounting provisions. 

4. Subsystems groups are responsible for pre-installation commissioning, internal alignment and assembly of detector components. SPHENIX project engineering is responsible for detector installation, alignment and survey, commissioning of services and utilities and full sPHENIX system commissioning (with appropriate coordination from subsystem groups).

5.  SPHENIX project managers have provided schedule and resources for the integration of  tracker subsystems, and tracker subsystem groups will provide subsystem components fully ready for integration into the sPHENIX full system in accordance with this schedule and will provide appropriate subsystem experts and technical support personnel to fit within the schedule and resource budgets. (Note: It will likely be necessary to make adjustments to budgeted schedule and resources as the design of these tracking subsystems matures. SPHENIX management will provide appropriate oversight and guidance to the subsystems to assure that these adjustments are reasonable, prudent and stay within the overall project scope.

-Don

On Sep 7, 2016, at 7:07 PM, EdwardOBrien <eobrien AT bnl.gov> wrote:

    Dear all,
     We did get homework for overnight. I have attached the homework
    with my annotation of who needs to provide what. I need
    help answering these questions. I will have to answer these questions first
    thing tomorrow morning in front of the committee.
    Please provide me these answers tonight if your name is listed
    as assigned to answer in powerpoint format I need to put together
    slides this evening and prepare for tomorrow. Let me know
    if you have any questions.
    Thank you.

    Ed

<sPHENIX Tracker Review Overnight Questions.docx>

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