sPHENIX tracking discussion

[Barbara Jacak <barbara.jacak AT gmail.com>]

Dear friends,

Please forgive the mysteries surrounding the LBNL activities. The proposal is still being worked on and more detail will be forthcoming once things are figured out. Proposals are due in another few weeks. The idea is to come up with a conceptual design for a low-mass barrel and forward silicon pixel tracker that would be appropriate for an EIC detector. That would allow one to potentially build some part of it earlier, without the need for a total redesign for an EIC detector. Part of our R&D strategy is to partner with the composites group early and ensure that any needed composite R&D is completed in time.

As Mike mentioned, the scope of our LDRD projects here at LBNL is generally not large. Furthermore, it's not yet clear how this proposal will fare. Please stay tuned. The lead person working on knitting the disparate threads into a proposal is Ernst Sichtermann, but there are many discussions underway with others as well. As you all might imagine we are still studying how scope beyond initial R&D can fit into the existing responsibilities at LBNL to STAR and ALICE. 

best regards,

Barbara

On Wed, Mar 9, 2016 at 7:26 AM, EdwardOBrien <eobrien AT bnl.gov> wrote:

    Hi Mike,
     A possible LBNL LDRD is an interesting development. Who is the lead on
    this at LBNL, Leo Greiner, Peter Jacobs..? Do you know if the scope
    of the LDRD is to be Si vertex mech engineering, ladder design, support structure?
    Is there any electronics component to the LDRD.  Thanks.

    Ed

On 3/7/2016 10:05 PM, Michael P. McCumber wrote:

Hello all,

Yes, my trip to LBL generated some interest and one plan that resulted is to submit for Berkeley lab funding to perform sPHENIX engineering R&D. My understanding is those funds are at the few times 100k per year level and of course are released in competition with other proposals.

In other good news our first MAPS prototype board has arrived at LAN---huzzah. Here is a pic (I'm just returning from WWND so haven't seen it myself yet):

Mike

--

Michael P. McCumber, PhD
Los Alamos National Laboratory
505-709-8161

On Mon, Mar 7, 2016 at 9:03 PM, Frawley, Anthony <afrawley AT fsu.edu> wrote:

Hi Ed,

  "LBL has an LDRD funding request to do sPHENIX engineering. Engineering and CFC R&D.
    This would be additional to a small request for Walt's time in Mike's LDRD."

It really was LBL that was intended, and yes CFC means carbon fiber composite.

Mike has two LDRD requests, the big one and a smaller, rather limited, one that is a backup.

Cheers

Tony

---

From: sphenix-tracking-l-bounces AT lists.bnl.gov <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of EdwardOBrien <eobrien AT bnl.gov>
Sent: Monday, March 7, 2016 5:52 PM
To: sphenix-tracking-l AT lists.bnl.gov
Subject: Re: [Sphenix-tracking-l] Minutes of February 26, 2016 tracking meeting

 

    Hi Tony,
     I have a couple of question about something in the minutes of the Tracking meeting
    from Feb 26. You wrote:

    "LBL has an LDRD funding request to do sPHENIX engineering. Engineering and CFC R&D.
    This would be additional to a small request for Walt's time in Mike's LDRD."

    Should this be "LANL has an LDRD funding to do sPHENIX engineering..."
    Does CFC mean carbon fiber composite?
    Also the way the third sentence is written suggests that there are two LANL LDRDs
    but I believe that there is only one. Correct?

    Thanks.

    Ed

On 2/26/2016 1:57 PM, Frawley, Anthony wrote:

Hi All,

In addition to reports on progress with tracking detectors, we had a discussion with Gunther Roland. I have placed that first in the minutes because it should be of interest to the collaboration in general, particularly the discussion about physics topical groups.

Cheers

Tony

Gunther Roland - Some news/thoughts/questions:
--------------------------------------------------------------------
We had a long discussion about how to move forward quickly with characterizing the performance of the tracking options for the key physics topics.

The conclusions were:

We need three money plots that demonstrate our capability to do critical physics. The number should be as small as possible:
  Jet substructure performance
  B-jet performance
  Upsilon(2S) / Upsilon(1S) ratio as a function of centrality

We should form topical groups focused on these three physics topics who will develop the analysis tools using simulated data.
The topical group manpower should feed back into helping develop detector simulations tools as needed to study the physics performance.
The output from these topical groups will provide the information we need for evaluating detector options.
The topical groups should have a leader and have regular meetings.

Dave and Gunther will follow through on forming the topical groups.
They will ask for reports from the topical groups at the collaboration meeting.

Since many of the institutions are new to sPHENIX, we need to schedule tutorials to help people get plugged into how to run the software efficiently.

It was noted that there are some groups that have already started exploring detector performance effects on physics, but we need to expand the manpower as much as possible, if we are to do a good job of evaluating the physics implications of the tracking design in time to make the decisions we need to make.

Mike suggested a tracking-wide workshop at the end of the summer, before the beginning of classes. Everyone thought this was a good idea.

Is there a plan for a TPC workshop similar to the silicon workshop in Santa Fe in March?. Tom: Not currently. We already have broad inroads because it is an extension of ILC development. But it is a good idea. June would work best for Tom.

Gunther suggested that SPHENIX start a bi-weekly meeting to keep people informed of what is going on in the collaboration. It was agreed that this was a good idea.

Rachid - Reused pixel configuration progress:
-------------------------------------------------------------
The tracking outer radius is now fixed at  (80 cm - 2 cm stay-clear) = 78 cm.

Layer p0: Added cooling, CFC, .... now nothing is missing.

Found that the 12 ladder geometry at 2.4 cm radius has overlaps.
Changed the tilt and increased the radius to 2.49 cm, increased to 13 ladders , now everything fits.

Slides 12 and 13:
What is the average mass of p0? Rachid: will get that and report back.

Rachid suggested doing G4 simulation of the new ladder geometry before trying to do p1.
Mike: Ladder based geometries are needed, but will not be available soon.
We have the VTX ladder geometry in FORTRAN, needs to be ported to G4.
Gaku volunteered to look into this. Mike will send what he has to Gaku.
Rachid will move ahead with p1 configuration in the meantime.

John: What are you going to do with the big wheels? A lot of mass outside the acceptance.
Rachid: After p1 configuration, we will move to the extender - want to move the SPIRO board far away, but
we have to understand how far is possible before the performance deteriorates.


Mike McCumber - Verbal report on MAPS progress
----------------------------------------
Last week was pre-proposal week at LANL.
Have submitted a DR large scale proposal ($1.65M/yr for 3 years, 1/3 equipment, 1/3 experimental FTE's, 1/3 theory FTE's).
Also, as a backup, an ER small proposal (320K/yr for 3 years for R&D, software, theory only).

Will hear back in a few weeks,  when the full proposals will be requested for the cases that pass the cut.

Mike visited Barbara at LBL to discuss LBL involvement.
Prototype boards are being shipped from CERN, Barbara offered to send a student to LANL for a week to help setup. Very good.

LBL has an LDRD funding request to do sPHENIX engineering. Engineering and CFC R&D.

This would be additional to a small request for Walt's time in Mike's LDRD.

Mike talked to Ernst while at LBL, got the ALICE ITS file for G4 - Mike showed a slide with the ROOT TGO object from that.
Mike will port out the code for each ladder type, and start stacking them for sPHENIX.

Barbara visited LANL and met with the LANL Division director and ALD yeterday.

There is interest from other groups, still at initial stages so no details. LBL, MIT are included.

The MAPS C&S workshop (late March) - registrations are in process. Have registrations from the MIT hadron group., Fleming V. will come.....

The meeting will be in downtown Santa Fe, the hotel will be chosen in the next few days.

Mike is trying to get some C&S details from Luciano Musa prior to the meeting, to help with organizing breakout sessions.

Mike posted slides last week where he dropped from 7 layers to 6 layers in the MAPS tracker. There was no significant increase in fakes, it looked fine.
He removed the 5th layer (24.5 cm). Will work more on this. Want to fully explore how much the surface area (and cost) can be reduced.
Tom: Were you asking the reconstruction to do 6 layers out of 6? Yes.

Mike talked to Leo Greiner. They are working on latchup issues. The STAR HFT runs wih 1% loss due to resets to prevent latchup.

The ALCIDE chip should overcome this, but that is not demonstrated yet, so Mike will add 1% inefficiency per layer to the sims.

Gunther: is this a ladder geometry or cylinder geometry? Mike: Cylinder. The realistic geometry needs tracking changes - the big item is a full Kalman that can handle complicated patterns of hits. Haiwang is working on setting that up.

Tom Hemmick - TPC progress report
-------------------------------------------------
Tom made a detailed report on the progress towards making mechanical decisions for the TPC field cage and end plate.

Tom: Question for JH and Ed: We will have final mandrel drawings in a few days to send to shop. Is there a standard mechanism for including drawings in an sPHENIX repository? John: Rich Ruggiero et. al. have their own internal system. Eventually they are intended to be archived at CAD. Send them to Rich. Also add to DocDB (sp?) as backup. Ed: make sure to maintain version control.

Ed: Stony Brook shops can manufacture the endplates? Yes.

Ed: We have made some progress on finding an engineer to verify the finite element analysis, working vigorously on it.

Itaru Nakagawa - Silicon strips progress report
--------------------------------------------------------------
Tom: Is the increase in dark current expected after grinding? Yes.

John: Does radiation damage hurt thinner detectors more? Rachid, the signal to noise will drop from about 20 to about 15 for the thinner detectors.

Still need to check that the FPX chip is not saturated.

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