sPHENIX is a new detector at RHIC.

[David Morrison <morrison AT bnl.gov>]

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Dave

On 10/20/17 11:46 AM, David Morrison wrote:
> Dear collaborators,
> 
> Notes from the last general meeting.  Thanks Rachid!  Today's meeting
> starts in a few minutes.
> 
> Dave
> 
> -------- Forwarded Message --------
> Subject: Notes from the 35th sPHENIX General meeting: October 06, 2017
> Date: Sun, 8 Oct 2017 21:39:47 -0400
> From: nouicer <rachid.nouicer AT bnl.gov>
> To: David Morrison <dave AT bnl.gov>, Gunther Roland <rolandg AT mit.edu>
> 
> Dear Dave and Gunther,
> 
> My notes that I took during the meeting are below.
> 
> Sincerely,
> Rachid
> 
> ----------------------------------------------------------------------------------------
> 
> Notes from the 35th sPHENIX General meeting:  October 06, 2017
> 
> https://indico.bnl.gov/conferenceDisplay.py?confId=3701
> 
> 
> ------------
> 1) sPHENIX collaboration news:
> Speakers: Dr. David Morrison (BNL), Prof. Gunther Roland (MIT)
> 
> - Medium energy physics:
> 
>       . Document of medium energy was sent to ALD Berndt.
>       . Berndt sent us back his comments and suggestions, but some of
> them were vague.
>       . Berndt's comments/suggestions were sent to the authors of the
> document.
>       . Berndt's suggested to add an executive summary to the medium
> energy document
>         and this will help DOE to carry the message better.
> 
> Q: Could you send Berndt's comments to sPHENIX?
> A (Dave): yes, I will do it after the meeting.
> 
> Q: When Berndt will have meeting with DOE about sPHENIX and Medium
> energy documents?
> A (Dave): Berndt says:
> 
>            - he plans to meet with DOE on the issue of medium energy
> funding next week
>        - sPHENIX: early November
> 
> - Magnet status:
> 
>           . there is a lot of progress, but PHENIX is straggling to get
> resources to achieve magnet test.
>           . Berndt asked sPHENIX to express these concerns of magnet
> tests in a written document.
>           . spHENIX will make written document about magnet test challenges.
> 
> 
>      * During DOE visit this week, the ALD Berndt confirmed to DOE the
> high priority of the sPHENIX for BNL lab.
> 
> - EIC related news
> 
>           . Abhay Deshpande is the Director of Science for the Electron
> Ion Collider (EIC), at BNL.
>           . Temple meeting November 30-December 1, 2017.
>           . We will have an ePHENIX talk at the Temple meeting.
>           . It is important to show to the world that sPHENIX is the
> base for a detector at EIC.
> 
>      * We have a good representation of sPHENIX members in the Bi-weekly
> eRHIC coffee klatsch at BNL.
>        However, if sPHENIX people are at BNL, that will be great if they
> come to the eRHIC coffee klatsch,
>        more people from our collaboration at that event it is always
> better for us/spHENIX.
> 
> 
> - Collaboration meeting
> 
>            . December 8-10 in Santa Fe, to be preceded by MVTX workfest.
>            . Nominal registration fee for the meeting ~$100
> 
> - Applying to be CERN recognized experiment
> 
>            . This document will make sPHENIX in an official position as
> an experiment from point of view of CERN.
>            . Several advantages if this is successful. Able to talk with
> CERN about sPHENIX on an official basis
>             such as about assembling/specific expectations regarding
> CERN : GEM, MAPS facilities
> 
> - Descoping strategy:
> 
>            . Berndt will meet with DOE to discuss Calorimeter/PHENIX
> descoping in early of November.
>            . Co-spokespersons would coordinate drafting of document for
> Berndt ALD.
> 
> 
> ------------
> 2) sPHENIX Project Update 20'
> Speaker: Edward O'Brien (BNL)
> 
> 
> - sPHENIX Project Update:
> 
>            . Beam test preparations are making good progress.
>            . We are made a lot of progress in closing the 33 action
> items from the Director’s review.
>            . We are identifying additional personnel for the project team.
>            . INTT will part of the beam test.
>            . BNL/RBRC hired a new engineer, Dan CACACE, which will be
> working on INTT and Calorimeter.
> 
> - sPHENIX Management Issues II:
> 
>           . The scrubbing exercise identified ~$100k in savings from
> re-examining the sPHENIX cost estimate.
>           . Other $700k engineering materials saving from other
> sub-detectors.
> 
> - Proposed review dates for Conceptual Design Reviews
> 
>            .  Nov 1 HCAL
>            .  Nov 8 EMCAL
>            .  Nov 15 Cal Electronics
>            .  Nov 29 TPC+TPC electronics
>            .  Dec 13 DAQ/Trigger+MBD
>            . January 5, 2018 is target date for completion of CDR
> 
> - sPHENIX Management Issues II:
> 
>            . We need Project Manager: Designate a person in charge of
> all Budget and Schedule
>              aspects of the MIE + Infrastructure and Facility Upgrade
> 
> Q (Dave): Many tasks but the overall status?
> 
> A (Ed): yes many tasks but most important are on the slide #3. Berndt
> and us are working hard on these tasks.
> 
> Dave/Ed: DOE seems working with sPHENIX and helping some funding available.
> 
> ------------
> 3) T-1044 2017 EMCal Note
> Joe Osborn for the EMCal group
> 
> 
>            . Analysis of 2017 EMCal test beam data has been posted
>            . First 2D projective SPACAL EMCal
>            . plan for beam energy scan: Two data sets and Two energy
> recalibration methods
>            . Hodoscope correction was used and published in 2016 test
> beam paper
> 
> - New Method: Position Recalibration
> 
>             . 2017 test beam introduces new cluster position dependent
> correction
> 
> - Energy Recalibration
> 
>             . Hodoscope and position dependent recalibrations yield
> similar improvements to resolution
> 
> Final Resolution
> 
>             . Simulation matches data
> 
> -What Have We Learned?
> 
>             . Intrinsic resolution of the 2D projective SPACAL tower.
>             . Cluster position energy correction works as well as
> hodoscope position energy correction.
>             . Towers are accurately described in simulation.
> 
> Conclusions:
> 
>             . First public showing of 2017 test beam results to be shown
> at IEEE talk on October 26th
> 
> 
> Q (Dave): quite good progress. Do you expect that energy cluster
> position will work for AuAu?
> A (Joe): we don't know. It is on our to-do list.
> 
> Q (Dave): the 2D projective: does help to fix the cracks in the acceptance?
> A (Woody): the modules' reposition to 150 mrad in phi and in eta 15 cm
> make the geometry complicated but better coverage.
> 
> 
> ------------
> T-1044 2017 HCal note
> Ron Belmont for the HCal Group
> 
>              . Data: energy resolution is better than sPHENIX
> specifications.
>              . Energy linearity is excellent.
>              . Simulation and data have a good agreement.
>              . Distributions of pions: data and simulation have a good
> agreement.
>              . HCal + EMCAL: you get the best energy resolution.
>              . HCal works, with excellent linearity and better than spec
> resolution.
> 
> - conclusion:
> 
>             . 2017 beam test HCal note ready to circulate.
>             . 2018 beam test data will yield critical insights about
> inner HCal de-scoping.
>             . Megan will show all the 2017 beam test results at the IEEE
> meeting.
> 
> 
> Comment (Ed): I don't expect that forward Cal. and middle Cal behave
> exactly the same.
> 
> Q (Peter) on slide #5: Small peak at low energy ?
>                        What is this?
> 
> A (Ron): it is due to muons punch through (muons from contamination)
> 
> Q (Peter): could you remove it by just using a cut?
> A (John Lajoie): it should not affect the variant of the full peak.
> 
>                     Ron:  HCal note will be circulated in a coming week.
> 
> ------------
> Further Jets Studies for the IHCAL
> Rosi Reed for the iHCal Group
> 
>            . simulation has been updated with the de-scoping and we are
> looking to the results.
>            . Do the configurations (de-scoping options) increase the
> bias with respect to fragmentation?
>              such as in 1) Quark vs Gluon jets, 2) High    z jets
>            . Conditons:
>                  - SS310, SS310 w/o readout, Al, and Al w/o readout, and
> SS310 frame (steel cylinder)
>                  - “Matched” jets require track and tower jets match the
> primary jet within ΔR<0.4
> 
>            . HCAL correction:
>                   - Consistent with test beam results
>                    - Constant as a function of energy
> 
> Q (Jamie) comments: scale factors change a lot because of material
> changes (Stainless steel)
> A (Rosi): there is a lot work need to be done and steel is extrem choice
> 
> - After Tower Corrections, I and II
> 
> Q (Jamie): you said performances are the same?
> A (Rosi):  these corrections do not affect the decision that we are making
> 
> 
> - Jets energy scale and Jet energy resolution
> 
>              . Jet energy resolution is getting worse with Stainless
> steel choice.
> 
> Question with echo: changing geomtery is affecting energy resolution and
> this is very bad?
> 
> A (Rosi):  yes the energy resolution is getting bad but we need more
> information on how to do configuration
> 
> 
> - Combined Jets    JES and JER:
> 
>                . Energy resolution is not so bad if we use propre algorithm
> 
> Q: these numbers on the table are idealised?
> 
> A (Rosi): we are trying to span several different scenario as function
> of time and resources. We are making sure that decision are not made
> on worse or best case. We will continue working on this in the next
> two weeks.
> 
> Lajoie: it is clear that people are wory of making decision based on
>     these simulations. We need to use particle flow algorithm and
>     maybe we need to use tracker.
> 
> Jamie: it is important to have a unique match between the tracking and
> Calorimter energy.
> 
> Gunther: particle flow algorithm works very nicely in CMS.
> 
> Rose: we need to give feedback to Berndt in a couple of week.
> 
> 
> - Flavor Jet Studies:
> 
>              . more study will be done later but this is the first look
> about quarks versus gluons
> 
> Q (Aroan, from Nevis): I don't understand why we are doing this ?
>                                      Are we going to do separation
> between quarks and gluons?
> 
> A (Rosi): we are doing this study to make sure that our configuration
> doesn't make this study harder in the future.
> 
> John Lajoie: I would lkie to point out that monte carlo has been changed
> since our last meeting.
> 
> 
> ------------
> Inner HCAL Design and Descoping Options
> J. Lajoie
> 
>             . To make inner HCAL cheaper with new configuration, we save
> $420k.
>             . Aluminum is more suitable, and this is good for our budget.
>             . Many venders are walling to do the work for us because of
> using aluminum.
>             . Materials' costs for an Al IHCAL could be reduced by as
> much as 80%
> 
> Q (Dave): you mentioned that the structure holding the inner HCAL made
>                 from stainless steel may be other material is better?
> 
> A (John L.): engineers are suggesting alumiunm but maybe other material,
> but the choice is dedicated  by the design.
> 
>             . Engineers resources are tight,  and we have to make best
> choices.
> 
> ----------------------------------------------------------------------------------
> 
> 

-- 
David Morrison  Brookhaven National Laboratory  phone: 631-344-5840
                Physics Department, Bldg 510 C    fax: 631-344-3253
                          Upton, NY 11973-5000  email: dave AT bnl.gov