Min Bias Trigger Detector for Heavy Ion Collisions
Re-using PHENIX BBC, this project aims to provide a high-efficiency min-bias trigger for heavy ion collisions with a z-vertex resolution of at least 2.5 cm. It contributes to reaction plane determination and start time in sPHENIX.
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WBS 1.7: Min Bias Trigger Detector Mickey Chiu July 13-14, 2017 BNL 1 sPHENIX Director's Review 07/13/17
WBS 1.7: Overview 1. Expected that we can re-use the PHENIX BBC 128 ch s of 3 cm thick quartz radiator on mesh dynode PMTs 2. Provide min-bias trigger with high efficiency for heavy ion collisions (>85%) Needs online z-vertex resolution of at least 2.5 cm, ie, 120 ps/ch 3. Contribute to reaction plane and start time 2 sPHENIX Director's Review 07/13/17
WBS 1.7: Placement in sPHENIX Considering z = 144, 200, 250, and 300 cm, ie, from original PHENIX location to near flux return z (cm) min max BZ (T) Rel. Gain AuAu MB Eff (%) pp MB Eff (%) 144 3.0 3.9 1.11 0.01 90 39 200 3.33 4.23 0.75 0.15 89 36 250 3.56 4.45 0.50 0.5 88 34 3 sPHENIX Director's Review 0.32 300 3.74 4.63 0.9 87 32 07/13/17
WBS 1.7: Readout Design In WBS 1.5 + 1.6 Scope sPHENIX Digitizers (2 or 4 ADC boards) Disc/Shape r Board BBC PMTs sPHENIX DAQ L1 Trig, Modebits, CLK sPHENIX GTM sPHENIX BBC LL1 sPHENIX GL1 In WBS 1.7 Scope Use sPHENIX EMCAL digitizers, and build a transition board to convert single-ended PMT signal to 100 ohm differential that stretches PMT signal to be recorded by 60 MHz ADC Two possibilities to satisfy the trigger and timing requirements. Both options require splitting the signal. One is a shaped pulse for energy measurement. The other is a square ~1V discriminator signal (for timing at trigger level and precisiong timing in offline). or is a ramp and hold on a comparator (TAC) that is input to the digitizer 4 sPHENIX Director's Review 07/13/17
WBS 1.7: Project Organization MinBias Management TPC EMCal HCal CalElectronics DAQ & Trigger (M. Chiu) CalEl Optical Sensors Mechanics Blocks Inner HCal DAQ Modules & Sectors GEM1 Outer HCal CalEl FEE Trigger GEM2 CalEl DAM GL1 Timing System GEM3 TPC FEE MBD Collaboration TPC DAM 1. BNL 2. RIKEN 3. Nevis 4. Lehigh M. Chiu, R. Pisani Y. Goto C.Y. Chi, W. Sippach R. Reed TPC Support 5 sPHENIX Director's Review 07/13/17
WBS 1.7: Project Scope 1. Test PHENIX BBC PMTs in Magnetic Fields up to limits required for sPHENIX ($5K) 2. Design and Test Discriminator/Shaper Front End Board ($50K) 1. Engineering by Nevis Labs 2. Testing by BNL/Lehigh 3. Production and Testing of Electronics ($46K) 1. sPHENIX Digitizer Boards, crates, etc will piggyback on purchase from WBS 1.5 4. Installation and Commissioning (off beam) 1. Can be commissioned with LED/laser system 6 sPHENIX Director's Review 07/13/17
WBS 1.7: Labor Profile + Schedule FTE Profile by Category 0.40 FTE Profile by Fiscal Year 0.35 0.30 Row Labels FY 17 FY 18 FY 19 FY 20 FY 21 FY 22 0.25 Cat B 0.24 0.11 0.01 0.10 0.02 0.00 FY 22 0.20 Engineering 0.06 0.05 0.00 0.00 0.00 0.00 FY 21 FY 20 0.15 Scientific 0.17 0.05 0.01 0.10 0.02 0.00 FY 19 0.10 Technical 0.01 0.00 0.00 0.00 0.00 0.00 FY 18 FY 17 0.05 Contributed 0.14 0.05 0.00 0.01 0.02 0.00 0.00 Scientific 0.06 0.05 0.00 0.01 0.02 0.00 Scientific Scientific Engineering Student Technical Student 0.08 0.00 0.00 0.00 0.00 0.00 Grand Total 0.38 0.16 0.01 0.11 0.03 0.00 Cat B Contributed Milestones in Schedule Apr 2020: Dec 2020: All electronics acquired and tested Ready for installation 7 sPHENIX Director's Review 07/13/17
WBS 1.7: Issues and Concerns sPHENIX Risk Registry WBS Risk Name Risk trigger (if) Consequences (then) Timeframe Probability Impact Rank Mitigation Plan Testing shows PMT gain drops below spec for B-field at MBD location. Must move MBD further away in z, losing some MB efficiency All 2% Cost: $0, Schedu le: 0 months Low Testing mesh dynode PMTs to remove uncertainty in B-field performance. Worst case, move BBC to z= 300 cm, where the field is low enough and is known to have been OK in PHENIX 1.7 MinBiasMagnetic field capability of BBC PMTs 8 sPHENIX Director's Review 07/13/17
Back Up 9 sPHENIX Director's Review 07/13/17
WBS 1.7: BoE Documents Do testing of PHENIX BBC PMTs with laser and in magnetic field to understand their parameters for operation in sPHENIX. sPHENIX WBS 1.7.1: Testing of BBC PMTs 4/13/17 DESCRIPTION MANUFACTURER PART NO. QUANT. VENDOR UNIT COST COST Laser Accessories Travel to Magnet Facility PiLas 1PiLas 2 2000 1500 2000 3000 TOTAL COST: 5000 Standard rates for travel were assumed ($1500/person). The cost for the laser accessories were based on previous purchases of similar items. A disc/shaper prototype board will be developed to stretch the PMT pulses to be optimized for the sampling frequency of the sPHENIX 60 MHz ADC digitizers. The board will create a fast discriminator circuit capable of satisfying the sPHENIX Min Bias trigger timing requirements, which is 50 ps in offline and 120 ps at the L1 trigger level. sPHENIX WBS 1.7.2: Discriminator/Shaper Board R&D 4/13/17 DESCRIPTION MANUFACTURER PART NO. QUANT. VENDOR UNIT COST COST D/S Board Contract Nevis Labs, Columbia U 1Nevis Labs, Columbia U 50000 50000 TOTAL COST: 50000 Estimates were based on experience at Nevis Laboratories developing similar boards. Nevis has made a great many boards of similar complexity over the past few decades. 10 sPHENIX Director's Review 07/13/17
WBS 1.7: BoE Documents Purchase the Front-End Electronics, and test them with full MB detector in the lab. sPHENIX WBS 1.7.3: Procure and Test Electronics 4/13/17 DESCRIPTION MANUFACTURER PART NO. QUANT. VENDOR UNIT COST COST Digitizer Boards XMIT Boards Controller Clockmaster Board Disc/Shaper Board Crate Backplane Crate Power Supplies Nevis Labs, Columbia U 4Nevis Labs, Columbia U 2 2 2 8 2 2 2 1920 410 470 1000 2000 1000 700 7500 7680 820 940 2000 16000 2000 1400 15000 TOTAL COST: 45840 For the digitizers, which are just the same as the ones used for the calorimeters in sPHENIX, all costs are assumed to be the same as WBS 1.5.3.2. For the Disc/Shaper Board, the cost basis is based on experience from the physicists/engineers at Nevis Labs, who have built similar boards. That s the complete project! 11 sPHENIX Director's Review 07/13/17
