1. Test of the SSD Electronics for the STAR HFT Upgrade Howard Matis - LBNL 1SLAC ESTB Workshop – March 2011

2. Previous Uses (2007) of Electron Test Beams LBNL’s Advanced Light Source – 1.5 GeV e’s 2SLAC ESTB Workshop – March 2011 LHC luminosity monitor

3. Vertex 2003H. Matis (hsmatis@lbl.gov)3 1.5 GeV electron source (ALS)  Quadrant with (left) and without (right) electron source applied. Test of MAPS pixel sensor

4. Usefulness of the ex-ALS Beam SLAC ESTB Workshop – March 20114  Easy to schedule time  Flexible use of beam  Lots of setup and debug time  Access detector almost anytime  Good technical support  Platform for mounting apparatus  Trigger counters in line  Not useful for physics experiments  Experts to beam tune  Other wishes  Patch panels  Easy way to have single point ground  Silicon telescope (not sure how to interface it with our system)

5. STAR at BNL is adding an inner tracking detector SLAC ESTB Workshop – March 20115  Building a 2 layer MAPS detector – very thin with 20 µm pixels (See L. Greiner’s Talk)  A larger Silicon Pixel Detector - IST  A “refurbished” Silicon Strip detector – SSD  Originally designed to run at 1 Hz  Must now run at 1000 Hz

6. SSD upgrade SLAC ESTB Workshop – March 20116  Detector silicon remains the same  Dual sided silicon  768 strips/module  75 mm × 42 mm  95 µm strip pitch  35 mrad angle  r- φ = 20 µm; z =740 µm  New  Analog to Digital Readout  RDO – Collector of Digital Data which sends it to DAQ  We need a test beam to verify performance of new electronics

7. Schematic SLAC ESTB Workshop – March 20117

8. Actual SSD Module Module Before electronics folded Final version SLAC ESTB Workshop – March 20118

9. Why we want a real beam SLAC ESTB Workshop – March 20119  Test of electronics with real particles  Proper ionization values  Too often tricked with Fe 55  Good way to measure rate affects  Can trigger on a beam  Efficiency Tests

10. Layout of Test SLAC ESTB Workshop – March 201110

11. Parameters required for Beam Tests Beam parametersValueComments Particle Type  Could also use pions or hadrons Energy> 3 GeVAs high as possible Rep Rate4 to 1000 kHzTest rate effects Charge per pulse1> 4 µs gap per pulse Energy SpreadDoes not matter Bunch length rmsDoes not matter Beam spot size, x-y2 cm × 2 cm Want to test whole detector without moving Others (emittance, …) LogisticsRequirements Space requirements (H x W x L) 8” 8” by 3” high + trigger scintillators Duration of Test and Shift Utilization One or two days; Come back in a few weeks; Day to setup. Desired Calendar Dates  11

12. Not my project 12SLAC ESTB Workshop – March 2011

13. 13 UCLA IEP/RHI Group (Huan Z. Huang, G. Igo, S. Trentalange, O. Tsai) New R&D for W powder SciFi (scintillating fiber) calorimeters Possible applications in STAR at RHIC: STAR forward upgrades Transformation STAR ➞ eSTAR Dedicated EIC (Electron Ion Collider) detector Simple to build in a university environment, cost effective, flexible technique to build compact sampling calorimeters. We plan to have test run in the fall 2011.

14. INTERACTION POINT (June 20, 2003) “Cooperative Spirit of SLAC Pays Off for UCLA Researchers.” Test Run T466 at SLAC In 2003, tested small EMC prototype at SLAC Refined construction technique in 2004 Scheduled for a test run at SLAC in the fall of 2004 Test run was postponed Not able to continue R&D in this direction Now ready to resume This method of building ScFi calorimeters has yet to be proven! A SLAC Test Beam Facility is very important for calorimetry R&Ds! 14SLAC ESTB Workshop – March 2011

15. As a proof of principle, we want to build 4 towers x 4 towers EMC prototype using new technique. We call it “spacardeon” Each tower will be about 20 rad. length long a bit more then 1" x 1” If funds available will try to investigate possibility of building a “SPACAL” hadronic calorimeter using W powder/SciFi. Beam 15SLAC ESTB Workshop – March 2011

16. Parameters required for Beam Tests Beam parametersValueComments Particle Typee Energy1 - 10 GeVThe higher the better Rep Rate1000 Hz or less Charge per pulse1 e - Variable 1-3 e - Energy Spread1% Bunch length rms<1 cm Beam spot size, x-y2 2 cm or less Others (emittance, …) LogisticsRequirements Space requirements (H x W x L)  1.5 m 1.5 m 2 m Duration of Test and Shift UtilizationDepends on rate, one week, 12 or 2 8 or 3 8 hours Desired Calendar DatesLate summer, fall 2011 16 SLAC STB Workshop – March 2011

17. Summary SLAC ESTB Workshop – March 201117  Test beams have been very useful in the past  Detector R & D  Production of detectors  Lack of test beams in the US  BNL does not have one  ALS stopped providing it  Fermilab?  Jefferson Lab?  CERN is expensive and difficult to use  A SLAC test beam would fill a natural gap  Easy to use for those on the west coast

18. Backup 18SLAC ESTB Workshop – March 2011

19. Example. Possible evolution of calorimeters in STAR. Forward direction (West side). Should consider: Available space Magnetic Field Radiation Installation/Integration 19SLAC ESTB Workshop – March 2011