Scintillator Based Muon System R&D Proposals - Summary

http://www.hep.uiuc.edu/LCRD/pdf_doc/LCRD_UCLC_7.pdf

I. LCRD – Paul Karchin (karchin@physics.wayne.edu) DOEII. UCLC – Arthur Maciel (maciel@fnal.gov) NSFInstitutions/Collaborators Fermilab: Alan Bross, Gene Fisk, Kurt Krempetz, Caroline Milstene, Adam Para, Oleg Prokovief, Ray Stefanski Northern Illinois University: Jerry Blazey, Dhiman Chakraborty, Alexandre Dychkant, David Hedin, Arthur Maciel Notre Dame University: Mitch Wayne UC Davis: Mani Tripathi Wayne State University: Paul Karchin Rice University: Paul Padley, J. Matveev, J. Roberts University of Texas, Austin: Karol Lang

Design Concepts ID from penetration of the Fe yoke

instrumented with scintillator planes;

Use the muon detector to measure shower leakage; CAL depth varies from 4 – 7;

Similar to a detector, but….

R & D is Needed – Why?• Geometry and packaging are challenging.• Radiation environment; must be able to

run for ~20 years.• Requires integration with barrel and

forward detectors, structural Fe, solenoid, mechanical support, cables, etc.

• Robust design parameters - must be understood, optimized, cost estimated, reviewed….

Strip Layout

0

0.5

1

1.5

2

2.5

3

0 1 2 3 4

meters

met

ers

Scintillator Layout and Strips

Scintillator: 4.1 X 1 cm2

co-extruded strips with1 mm dia. WLS fiber and outer reflector of TiO2.

U/V strips with wls shifted light exiting both ends. Add left/right signals fromclear fibers to provide the pulse height sum.

MINOS Hamamatsu H6568 Multi-anode PM16 anodes ea. 4 x 4 mm2

MINOS – MAPMT with fiber guide

Num

ber o

f obs

erve

d ph

otoe

lect

rons

Distance along the module (m)

Near11±3 p.e.

Far (3.6 m for the proposed layout)6±2 p.e.

Measured light output using the complete MINOS optical system:Connectors, clear fibers, multi-anode PMT’s

MINOS Scintillator

PM, Channel Count

Scintillator

93,966 42,766 51,200WLS Fibers

TotalEndsBarrel

187,932

9,527 4,353 7,174Area (m2)

95.3Vol. (m3)

114.3TM (=1.2g/cm3)

Clear Fibers

16 channel multi-anode PM

30mm

Hamamatsu H6568

Physics IssuesMany unanswered questions:• What is the scintillator based muon system

tracking efficiency with the various tracking algorithms?

e.g. for muons in jets? (Piccolo studies)• Energy flow: How much does the muon system

reduce calorimetry errors? (Piccolo studies)• What are the punch-through rates for

proposed geometries (Piccolo studies) and how much can punch-through be reduced with calorimeter+muon algorithms?

• Studies of benchmark signals and backgrounds; signal/background numbers.

• ………

Detector Issues• Specifications for detector components requires detailed

knowledge of scintillator, fibers, MAPMTs – much of which is available from MINOS; NIU scintillator development.

• FE electronics specifications based on performance of measured signals, noise, circuit ele. (NIU, UCDavis, Wayne State, UTAustin).

• Detector geometry issues: Readout both ends of the scintillator strips? Routing of fibers?Layout of modules? U,V at 90 deg or small angle stereo?Dealing with ambiguities?Which PM, how many anodes, multiplexing schemes….?

• Wire chambers at the entrance to the muon system?

Projects - UCLC Software (3 yrs) NIU

• Contribute to a C++/GEANT4 stand-alone event simulation package (with others);

• Help develop detector geometry & parameter input decoupled (e.g. external db) from simulation code – general framework with muon system as the example.

• Develop muon tracking for this package of programs.• Integration of muon software with other detectors.• Documentation of the event generation, geometry

description and analysis packages.• This is a major project that cannot go ahead

unless the proposal is funded.

Projects - UCLC hardware (3 yrs)

• Assemble and commission, with Fermilab, the NIU purchased scintillator extrusion machine.

• Develop QC test stand for measuring the quality of extruded scintillator (NIU/Fermilab + 2 co-ops)

• Develop grooving and WLS fiber gluing (UND/NIU).• Develop WLS/clear fiber splice, mechanical support,

light tighting scheme, fiber routing. (UND) MX = 8?• Develop coupling of clear fibers to MAPMT. (UND)• Testing, calibration, data archiving, analysis

schemes.

Projects - LCRD software (2 yrs)• Simulation studies to understand multiplexing

(UCDavis/Wayne State).• Continued muon ID/tracking algorithm

development and studies (Fermilab).• Participation in the development of GEANT4

based simulation, geometry definition and analysis software as manpower becomes available (Fermilab, UC Davis, Wayne State).

Projects - LCRD hardware (2 yrs)

• PMT/scintillator + borrowed FE and ADC electronics tests and measurements (UC Davis/Wayne State) to develop specifications.

• Rejuvenate cosmic ray test stand in the Fermilab Village to simultaneously test multiple strips (Wayne State, UC Davis & Fermilab).

• Develop mechanical and electrical specifications for scintillator planes (Fermilab/Wayne State /UC Davis).

• Develop mechanical plans for Fe/scintillator sandwich of planes (Fermilab).

Summary• We are beginning to make progress on some of

the muon system studies that need to be done;• The lack of funding is holding back progress;

e.g. two of our collaborating institutions could not send anyone to this workshop due to a shortage of travel funds.

• Additional manpower is needed, especially in the area of software development. University groups are particularly well suited to providing this if there is funding available.

• We are poised and ready…