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TEST BEAMS

Detailed review of test beams, coordination, and experiments at Stanford Linear Accelerator Center in 1997. Includes results, experiments, and future test schedules for electron, positron, and photon beams.

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TEST BEAMS

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  1. Stanford Linear Accelerator Center TEST BEAMS Ted Fieguth DoE/SLAC Program Review April 29-30 & May 1, 1997

  2. Stanford Linear Accelerator Center TEST BEAMS DoE/SLAC Program Review April 29-30 & May 1, 1997 Ted Fieguth SLAC • Introduction • Test Beam Coordination and the SLAC Program • Available Test Beams • How Parasitic Beams are Produced • Some Typical Results • List of Proposed Test Beam Experiments • Selected Tests and Their Goals • Possible Near Term Test Schedule • Possibility of Pion Beam Tests • Conclusions and Goals

  3. Stanford Linear Accelerator Center Test Beam Coordination Directorate SLAC Program Coordinator C. Field Accelerator Dept. ESA: R. Erickson FFTB: R. Iverson Test Beam Users Test Beam Coordinator T. Fieguth* Safety Overview Committee D. Fryberger Area Manager ESA: P. Anthony FFTB: A. Baker Experimental Facilities Dept. Radiation Physics ESA: S. Mao FFTB: S. Rokni *R. Gearhart, now retiring, coordinated Test Beams for 25 years Talk Presented at...

  4. Stanford Linear Accelerator Center Primary or Parasitic Test Beams are available in ESA and FFTB FINAL FOCUS TEST BEAM END STATION A

  5. Stanford Linear Accelerator Center How Parasitic Secondary Beam is Produced* Dipole Magnet 5-10% of SLC beam is scraped on sector 28-30 collimators. Bremsstrahlung photons go straight head downstream,through the bending magnets striking a 0.7 X0 copper target producing electron-positron pairs. Electrons that are within a fixed angular acceptance and adjustable momentum acceptance enter the A-line and are transported to End Station A (ESA). * This method of obtaining test beams was suggested by A. Odian and developed by L. Keller and others

  6. Stanford Linear Accelerator Center Test of Tagged Photon Production for GLAST( T412 1996) Apparatus being tested ·Test of prototype GLAST calorimeters in electron beam · Wire chamber tagged photons >200 MeV · Lower energy untagged photons also present

  7. Stanford Linear Accelerator Center Measurement of Low Energy Electron Yield during 1996 GLAST Test ( Daniel Engovatov et. al. ) • Electron beam: • 1.3 - 40 GeV electron beam. • 120 Hz • Dp/p ~ £ ± 1% • sx,y ~ .5-2.5 cm • Dq ~ ±1 mrad, mostly from scattering. Energy in Pb Glass • Photon beam: • Generated by • ~ 5 - 10 GeV, 0.3- 0.5 elec/ pulse • ~ 0.02 - 0.03 g / pulse >10 MeV • g energy measured by GLAST calorimeter. • sx,y ~ 1-2 cm • Dq ~ ±1 mrad

  8. Stanford Linear Accelerator Center Typical Calorimetric Measurement of Particle Flux W. Bugg et. al., U. Tennessee Measurement of 13 GeV electron flux per pulse in FFTB during test T405 of the Tungsten-Silicon Sampling Calorimeters designed for E144 for recording energy of scattered e-, e+ and g ‘s.

  9. Stanford Linear Accelerator Center ESA Data Aquisition System Maintained and Available for Users Roving VME can be moved about ESA floor Users can control Stepping Motors etc. USERS INPUTS Beam Monitoring Online Analysis Workstations Local Data Logging 8mm tape 1 Mbyte/sec SCS Tape Silo

  10. Stanford Linear Accelerator Center 1997 Test Beam Proposals

  11. Stanford Linear Accelerator Center GLAST Science Prototype Test Beam Setup GLAST PROTOTYPE TEST VIEWGRAPH FROM BILL ATWOOD

  12. Stanford Linear Accelerator Center Stanford Linear Accelerator Center PROPOSED NEAR TERM TEST SCHEDULE

  13. Stanford Linear Accelerator Center ESA SPECTROMETERS PHOTOGRAPH OF ESA SPECTROMETERS

  14. Stanford Linear Accelerator Center Conclusions and Goals DoE/SLAC Program Review April 29-30 & May 1, 1997 Ted Fieguth SLAC • SLAC continues to provide necessary and useful electron positron and photon Test Beams for many Users • The Proposed Near Term Schedule is not crowded and will be achieved Conclusion: Goal: • Maintain commitment to provide SLAC Test Beam Facilities to the user community • Better understand the Test Beam capabilities and improve where possible • Work to provide and maintain a low energy pion beam. • Improve information regarding Test Beams on the SLAC Web Site

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