sPHENIX is a new detector at RHIC.

[sookhyun lee <dr.sookhyun.lee AT gmail.com>]

Dear all,

Below are the minutes of the 60th general meeting.

Best regards,

Sookhyun

[ Collaboration news by Dave and Gunther]

- cQCD TG news: Nils stepped down as co-convener. Christine will stay on as convener, but steps down as EIC detector study group leader.

- computing retreat at BNL: There were presentations from various BNL groups and discussions. Homework from summer computing review were addressed. No clear conclusion was drawn and more discussions will be needed at the collaboration meeting. 

- INTT meeting at RIKEN: INTT group held a 1-day meeting at RIKEN with Prof. Chia-Ming Kuo (from NCU/Taiwan) and discussed possible involvement of NCU in INTT project. Will apply for membership in December.

- Pan-Asian collaboration meeting: A Pan-Asian collaboration meeting has been proposed for March 2019 to better facilitate Asian institutions' current involvement in the project, they are playing an important role in INTT and EMCal. Will be supported by NCU and possibly by MIT. 

- CERN recognized experiment: Processes to have sPHENIX as a CERN recognized experiment is in progress. Application completed. A meeting at CERN with Luciano is scheduled tentatively for Nov. 29 to explore training/collaboration opportunities related to ALICE IB/MVTX stave production and testing. 

- TLH Collaboration meeting: Hotel reservations at a negotiated rate is ended on Nov 16, 2018. Please register if you plan to be at the meeting. Draft agenda will be circulated on Monday and there will be 1-day pre-meeting & 2-day post-meeting MVTX/tracking workfest.

- Talks: Volunteers are needed to give more talks at WWND 2018 (Colorado) and Santa Fe workshop (UCLA).

- Picture book: Picture book has been launched to help those who give talks find information more easily. Approved performance plots, photos and etc. are saved  in master keynote/pptx files on DropBox. 

[Project update by Ed O'brien]

- Recent new/issues: TEC accounts for LLPs are open. LLP-1 100k SiPM has been placed, Scintillating tile and fiber LLPs next in the pipe. SAMPA v5 multi-project run has been placed with help from SBU and USP. Cost for MVTX CERN components set and paperwork for purchase has started at U Tennessee. 

- Project activities: Monthly statusing of each L2 started in Oct. Plan to practice EVMS starting Nov 2018. Begin preparation for PD-2/3 scheduled for May 2019. 

- TPC test beam analysis with small prototype shows good resolution and work on full-size prototype continues. Costs for 10 Felix 2.0 DAM boards estimated at $76k. 

- Half of EMCal sector 0 blocks complete at UIUC. Production of block shapes for high eta is progressing at Fudan University.

- sPHENIX components starting with HCal are soon to arrive at BNL. HCal scintillator tiles pre-production started at Uniplast.

- Cal electronics orders placed/in process.

[ RHIC beam optimization for sPHENIX by John Haggerty ]

John showed results of initial studies done to find an optimum crossing angle at which sPHENIX can operate with a lower collision rate to mitigate high level pile up in TPC.    

p2 The model to predict PHENIX BB rate at different crossing angle and Mathematica notebook were provided by Wolfram. 

p3 Almost all luminosity will be within +-10 cm vertex range at crossing of 3 mrad. 

p4 The BB and ZDC rates taken for a store from Run16 AuAu runs are in the ballpark of what the model predicts, i.e. hundreds of kHz. 

p5 The peak luminosity at zero crossing angle from Run 16 that RHIC Run 16 page reports is 155x1026 cm-2s-1, but note that the model used is very simplified model.

p6 Vertex distributions tend to narrow as the crossing angle increases. 

p7 A typical luminosity plot from Run 16 was shown to compare with the model prediction. The Zbbc (BBCLL1) distribution in blue is comparable to the model prediction of σ = 20 cm. 

p8 At crossing angle of 3 mrad, most of luminosity will be within +-10 cm vertex range. Fraction of luminosity within +- 10 cm at crossing angle of 3 mrad w/r/t full luminosity at zero crossing angle will drop to 0.25 (from 0.4 at zero crossing angle). 

p9 The model is in reasonable agreement, so a crossing angle of 3 rad will be optimum operation point for sPHENIX. There are still questions that need to be answered such as whether our detectors will fit with a beam crossing angle of 3 mrad.

TH: Is one beam at +3 mrad and the other at -3 mrad or is it +- 1.5 mrad?

JH: It is at +- 1.5 mrad.

SB: There are measurement that can benefit from the whole +-30 cm vertex such as photons, direct photons and jets. Will we have a separate run with zero crossing angle to provide data for calibrations? 

JH: It will be hard and there may not be any great virtue in having collisions outside the MVTX acceptance from a tracking point of view.

DM: Without detailed information about materials for support structure, events outside the vertex detector acceptance will be hard to study. If you are looking at high pT photon measurements you don't need tracking. 

SB: There are also jets. 

JH: There might be satellite peaks that the model does not describe. 

SB: I'd expect the satellite peaks will be suppressed at 3 mrad crossing angle. Is changing the beam crossing angle hard from CAD point of view?

JH: As we have enough time to think about this, we can come up with a way to make it not so hard and consult CAD. 

[OSI update by Mickey]

- INTT-MVTX integration : 3D mock-up shows MVTX and 4 INTT layers can coexist. 

- Racks are assigned. Will be 3 levels and contents are being collected. 

- Upper rack will hold cable trays. Cable organization is being documented using ICD. MBD and INTT cable routing are being worked out.  

- General grounding concepts were explained and the guidelines are documented in DocDB. sPHENIX will have a separate clean ground. All subsystems are required to have a documented grounding plan by Dec. collaboration meeting.   

[NSF iHCAL proposal and MEPHI/Uniplast update]

- Visit to Uniplast generated a lot of confidence in their technical expertise. Expect very high quality products.

- MEPHI visit went well and looking forward to getting them involved in tile mapping using their cosmic ray air shower detector, which will have an impact on understanding systematic effects. 

- NSF MRI is well on track.

On Fri, Nov 16, 2018 at 5:15 AM Gunther M Roland <rolandg AT mit.edu> wrote:

Friends,

We'll have the 60th General Meeting at noon today. The agenda and connection info (also copied below) can be found at 

https://indico.bnl.gov/event/5349/

Cheers,

Gunther and Dave

>>>>

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