# Presentation: 537895

## Physics with the MIPP detector and its RICH counter

- Rajendran Raja
- Fermilab
- Beam
- MIPP experiment
- Physics
- Service measurements
- Particle ID
- RICH
- Results from the Engineering run
- Upgrade plans

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP collaboration list

***MIPP collaboration list***

- Y. Fisyak
- Brookhaven National Laboratory
- R. Winston
- EFI, University of Chicago
- M.Austin,R.J.Peterson
- University of Colorado, Boulder,
- E.Swallow
- Elmhurst College and EFI
- W.Baker,D.Carey,J.Hylen, C.Johnstone,M.Kostin, H.Meyer, N.Mokhov, A.Para, R.Raja,S. Striganov
- Fermi National Accelerator Laboratory
- G. Feldman, A.Lebedev, S.Seun
- Harvard University
- P.Hanlet, O.Kamaev,D.Kaplan, H.Rubin,N.Solomey
- Illinois Institute of Technology
- U.Akgun,G.Aydin,F.Duru,Y.Gunyadin,Y.Onel, A.Penzo
- University of Iowa
- N.Graf, M. Messier,J.Paley
- Indiana University
- P.D.BarnesJr.,E.Hartouni,M.Heffner,D.Lange,R.Soltz, D.Wright
- Lawrence Livermore Laboratory
- H.R.Gustafson,M.Longo, H-K.Park, D.Rajaram
- University of Michigan
- A.Bujak, L.Gutay,D.E.Miller
- Purdue University
- T.Bergfeld,A.Godley,S.R.Mishra,C.Rosenfeld,K.Wu
- University of South Carolina
- C.Dukes, H.Lane,L.C.Lu,C.Maternick,K.Nelson,A.Norman
- University of Virginia

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Brief Description of Experiment

- Approved November 2001
- Situated in Meson Center 7
- Uses 120GeV Main Injector Primary protons to produce secondary beams of K  p  from 5 GeV/c to 100 GeV/c to measure particle production cross sections of various nuclei including hydrogen.
- Using a TPC we measure momenta of ~all charged particles produced in the interaction and identify the charged particles in the final state using a combination of dE/dx, ToF, differential Cherenkov and RICH technologies.
- Open Geometry- Lower systematics. TPC gives high statistics. Existing data poor quality.

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Physics Interest

- Particle Physics-To acquire unbiased high statistics data with complete particle id coverage for hadron interactions.
- Study non-perturbative QCD hadron dynamics, scaling laws of particle production
- Investigate light meson spectroscopy, pentaquarks?, glueballs
- Nuclear Physics
- Investigate strangeness production in nuclei- RHIC connection
- Nuclear scaling
- Propagation of flavor through nuclei
- Service Measurements
- Atmospheric neutrinos – Cross sections of protons and pions on Nitrogen from 5 GeV- 120 GeV
- Improve shower models in MARS, Geant4
- Make measurements of production of pions for neutrino factory/muon collider targets
- Proton Radiography– Stockpile Stewardship- National Security
- MINOS target measurements – pion production measurements to control the near/far systematics
- HARP at CERN went from 2-15GeV incoming pion and proton beams. MIPP will go from 5-100 GeV/c for 6 beam species K  p  -- 420M triggers. 3KHZ TPC.

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP Secondary Beam

- Installed in 2003. Delivering slow spill commissioning beam (40GeV/c positives since February 2004).  Finished Engineering run in Aug 2004.

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP Physics Program

-  MIPP has 4 distinct clientele for its data, which are interconnected. They are
-  Liquid H2, D2 –non-perturbative QCD
-  p-A, p-rad (aka SURVEY)
- NUMI thin and full target measurements
- LN2– Atmospheric neutrinos

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Status of MIPP Now-Collision Hall

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## TPC 

** **

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP-TPC

- This Time Projection Chamber, built by the BEVALAC group at LBL for heavy ion studies currently sits in the E-910 particle production experiment at BNL, that has completed data taking. It took approximately $3million to construct.
- Can handle high multiplicity events.  Time to drift across TPC=16 s.
- Electronic equivalent of bubble chamber, high acceptance, with dE/dx capabilities. Dead time 16s. i.e unreacted beam swept out in 8s. Can tolerate  105 particles per second going through it.
- Can handle data taking rate ~60Hz with current electronics. Can increase this to ~1000 Hz with an upgrade.
- TPC dimensions of 96 x 75 x 150 cm.

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP Cherenkov

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Particle Identification

- TPC as shown can provide 3separation with dE/ dx up to 0.7 GeV/c for /K and 1.1 GeV/c for K/p as well as ambiguous additional information in the relativistic rise region.
- In the intermediate region, we use a multi-cell Cerenkov detector. Light is collected by 96 phototubes from reflective mirrors. Filled with C4F10, the Cerenkov thresholds for, K, p are 2.5, 7.5 and 17.5 GeV/c.
- Above 7.5 GeV/c, many particles will go through to the RICH counter and be identified. We use a RICH counter filled with CO2.
- Threshold         Ne     N2        CO2
-      
-      K                  42      20        17
-      p                   80      38         33

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP Particle ID

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Engineering Run results

- Had RICH fire. Recovered from it 80% of tubes in tact. RICH is now engineered a lot more safely
- Flammable tubing on tubes changed
- Base soldering corrections redone where needed
- HV connections made more robust
- VESDA safety trips
- HV trips on sparks as well as over-current
- Nitrogen purge.
- TPC broke wires– Fixed, Anode HV fixed
- PWC5,6 broke wires- Fixed
- Drift chambers made functional– re-fused.
- BCKOVs auto pressure curves. Worked well
- ToF wall worked
- Calorimeters worked

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Beam Chamber profiles- BC2

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Preliminary results from Engineering run

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP RICH

- Inherited from SELEX (which ran with Neon at higher momenta)
- MIPP runs with CO2.
- It had  89 columns and 32 rows of   phototubes.
- Two kind of tubes being used-
- FEU-60 (made in Russia) 70 columns
- R-760 Hamamtsu (Japan) 19 columns
- Each column has 32 tubes total of 2848 tubes.
- We completely re-designed the front end electronics

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP RICHSelex paper Nucl.Instrum.Meth.A431:53-69,1999 

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP RICH- CO2 characteristics

- Average Refractive index-1.00048
- Average focal length 991.504cm

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## MIPP RICH

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## RICH Fire Pictures

- Lost 20% of the phototubes. Redesigned the Safety system
- Vesda, HVTrip circuit, Nitrogen purge
- Flame retardant sleeves

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## RICH HV supplies

- Glassman HV systems
- Current trip limits 3x100mA,2x140mA.
- Interlocked with RICH
- Trips upon spark
- Put out 900Watts for ~3000 phototubes

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## RICH readout

- 89 Front-end
- Cards

- 3 VME
- Controllers

- 89 columns of
- 32 PMT's

- Controller sets thresholds, channel masks, and pipeline delays through serial communication line
- Controller receives a trigger gate, transmits it to FEB's and reads out data
- RICH VME controllers are readout by Motorola MVME 2434 PowerPC

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## VME Controller

- Contains TI MSP430 micro-controller for slow controls and Altera FPGA clocked at 53 MHz for data readout
- Capable of driving up to 31 daisy-chained front-end cards
- Connections require one RJ-11 cable and one 17-pair ribbon cable
- VME communication is A24/D16 format

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Front-end card

***Front-end card***

- Discrimated signal goes into a 2μs pipeline
- Signals in the pipeline corresponding to trigger gate (strobe) are latched
- Readout signal may come at any time
- Boards may be strobed multiple times thus allowing multi-level trigger

- x20

- }

- x32

- Pipeline

- PMT signal

- Latch

- To VME controller

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Front-end card

- Micro-controller handles slow controls, Altera FPGA handles readout
- Low power design: <350 mA at 5V per board, cooled convectively
- Discriminator threshold is linear up to 40mV in 0.04mV steps, and non-linear up to 1V
- One threshold setting per channel

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## RICH rings pattern recognized

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## RICH radii for + 40 GeV beam triggers

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Beam Cherenkovs

- Pressure curve Automated- Mini-Daq-APACS 30 minutes per pressure curve.+40GeV/c beam.

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Beam Cherenkovs

- 40 GeV/c negative beam

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Comparing Beam Cherenkov to RICH for +40 GeV beam triggers-No additional cuts!

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004

## Conclusions

- MIPP Looks forward to a productive physics run.
-  The RICH as well as the other Cerenkov detectors form the bulk of the particle ID.

- Rajendran Raja, RICH2004, Mexico

- Nov 30-Dec 5, 2004