Integration R. Michaels, May 23, 2013

• Combine (integrate) detectors and electronics so that the physics program is satisfied.

• System-wide issues e.g. trigger requirement, DAQ, hall infrastructure, switchover between experiments.

SoLID Collaboration Meeting 2

Physics Program of SoLID• Parity Violation DIS: Quark Axial charge, Charge

Symmetry Violation …– Inclusive DIS

• SoLID-Spin : Nucleon Spin, Tensor Charge, TMD, Quark OAM …– Semi-inclusive Deep

Inelastic Scattering (SIDIS)

• J/ψ: Nucleon Mass, Non-perturbative gluons– Exclusive Process

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'e N e X

' /e p e J p

RequirementsExperiment PVDIS SIDIS-3He SIDIS-Proton J/Psi

Target LH2 / LD2 3He NH3 LH2

Luminosity 1039 1037 1036 1037

Momentum 2.3 – 5.0 0.8 – 7.0 0.8 – 7.0 0.6 – 7.0

Angles 21 – 36 7.5 - 24 7.5 - 24 7.5 - 24

Trigger Single e e pi coinc e pi coinc e+ e- e- coinc

Rates 17 kHz x 30 sectors

< 100 kHz 10 kHz 3 kHz

Backgrounds Pi- (e,pi- pi+/-) (e,e’ K+/-)

(e,pi-,p+/-)(e,e’ K+/-)

B-H

Requirements, cont.Experiment PVDIS SIDIS-3He SIDIS-Proton J/Psi

Big Issues

Radiation hardness, 0.4% polarim., pi- contam., Q2 calibration

Radiation hardness, Detector resolution, Kaon contamination

Shielding of sheet of flame, target spin flip, Kaon contamination

Radiation hardness, Detector resolution

GEM chambers

4 6 6 6

ECAL Forward angle Forward + Large Angle

Forward + Large Angle

Forward + Large Angle

Baffles yes no no no

Heavy Cerenkov

no 0.9 m long 0.9 m long no

Requirements, cont.Experiment PVDIS SIDIS-3He SIDIS-Proton J/Psi

MRPC none 80 psec resolution

80 psec resolution

80 psec resolution

Beam polarimetry

0.4 % 3 % 3 % 3 %

Target polarimetry

none 3 % 3 % none

DAQ Singles in 30 sectors (+ overlaps)

Read entire detector. Coinc. Trig.

Read entire detector. Coinc Trig.

Read entire detector, Triple Coinc.

Heavy Cerenkov

no 0.9 m long 0.9 m long no

Example: Combined pi/e ratio from Cerenkov & Calorimeter for PVDIS as function of polar angle and momentum As shown last meeting and in PCDR

Work done by

• Xin Qian

• Mike Paolone

• Jin Huang

0.2 %

0.02 %

1.5 %

Goal: error in pion contamination < 10-3This is “the best it can be”, but not a L1 or L3 trigger. Question: what are the L1 & L3 rates ?

DAQ BasicsFrontend (e.g. FADC)

Crate processor Global

Processing(SSP, GTP)

Other crates

Frontend (e.g. FADC)

L3 Farm

Tape8 usec pipeline

L1

DAQ BasicsFrontend (e.g. FADC)

Crate processor Global

Processing(SSP, GTP)

Other crates

Frontend (e.g. FADC)

L3 Farm

TapeFPGA – programming at each level of hardware.

FPGA

FPGAFPGA

FPGA

flexibility

L1

DAQ BasicsFrontend (e.g. FADC)

Crate processor Global

Processing(SSP, GTP)

Other crates

Frontend (e.g. FADC)

L3 Farm

TapeQ: What limits allowed at each stage ?

L1 < 100 Khz ? (entire system)

L3 < 300 MB/sec ?

L1 < 100 Khz ?

FADC Counting Mode Photon DAQ – present effort

e-det

(We have a prelim. spec. of a VXS-based pipelining trigger board to be prototyped in ~1 year for 7K$)

hallaweb.jlab.org/equipment/daq/compton_coda3.pdf hallaweb.jlab.org/wiki/index.php/ComptonDaqDev

Bob Michaels, Kalyan Allada, Alexandre Camsonne, and DAQ Group

12 GeV DAQ Test Stand – Initially for Compton Upgrade

12 GeV DAQ Test Stand – Initially for Compton Upgrade

An event in the FADC

Setup (moved to TEDF)

Trigger Simulation Studies to Be Performed (possibly)

I. Maybe something quick can be done using the software that combined “best possible” PID, i.e. put in rates and some crude model of trigger ???

II. Use existing Geant setups to define models for the response of detectors (amplitude distributions). GEMC generates events and tracks particles into detectors, where models are applied. The models are being specified

III. Unify all the Geant efforts into one common framework. Encode rate effects , digitization by the DAQ, and trigger logic at L1 and L3. (perhaps best approach, but takes longest)

Goals: estimate L1 and L3 rates and efficiencies to “keep the physics”. Inform the trigger/DAQ design effort.

Yuxiang Zhao, Yi Qiang, Rakitha Beminiwattha, Michael Paolone, Jin Huang, Zhiwen Zhao

Some Issues

• We need hardware experience with 12 GeV DAQ technology

• Work on combining detectors to design triggers

• Calibrations -- see Rich’s talk (March 22) and Xin’s talk (Dec 14)

• What do we really need for the PCDR ?