1. Aspen High School, Aspen, CO Basalt High School, Basalt, CO Roaring Fork Valley High School, Carbondale, CO Lake County High School, Leadville, CO The highest-elevation school in U.S. -- 10,152 feet above sea level SALTA: Snowmass Area Large Time-Coincidence Array Empire Clear Creek High School, Empire, CO

2. Polishing scintillator edges outside Conference Center Making detectors light-tight SALTA Workshop, July 2001, Snowmass, CO mass phototube gluing

3. PMMA (polymethyl methacrylate) doped with a scintillating fluor 2 ft x 2 ft x ½ inch Read out by 10 stage EMI 9256 photomultiplier tube The Chicago Air Shower Array recycling retired detectors from the Chicago Air Shower Array located in the Utah Desert: 1089 stations, 15m spacing covering 0.23 square km

4. CROP Summer Workshops http://crop/unl.edu/

5. Henderson Mine Visit Dec 4, 2003 hosted by Chip deWolfe Marc Whitley Diana Kruis Nancy Spletzer Aspen High School Basalt High School Clear Creek High School Michelle Ernzen Laura French Lake County School Roaring Fork Valley Hans-Gerd Berns University of Washington Dan Claes University of Nebraska

6. Aspen Center for Physics Education & Outreach Workshop July 6-8, 2004 SALTA schools take over the library, setting up cosmic ray telescopes, for training in the new DAQcard that will be used in all their data-taking.

7. A portable stand held each muon telescope. Detectors telescoped pair with coincidence requirement against noise sandwiching a ¼ inch lead sheet were configured into muon telescopes 2 modules taken down into the mine Detectors moved at 2-3 week intervals

8. since dust posed a problem for a PC we housed a low-power serial digital data logger alongside the DAQcard Acumen Instruments Databridge development kit

9. Desktop Base Station An ~identical pair of modules ran in a fixed location (surface office) to establish our baseline

10. SALTA’s Henderson Project was launched September 29, 2004

11. Clear Creek High School students set up the satellite modules at the 1 st underground location

12. Basalt High School students move the detectors to their 2 nd location

13. Rates at Henderson surface base station (10,337 ft above sea level) = 2.5  rates at Lincoln, NE (elevation: 1189 ft) Data collected between Sept 29 – Dec 8, 2004 monitored 4 locations between depths of 2800-3900 ft Raw rates in muon telescopes seen to drop from 10 Hz (surface rate) → 1 Hz → 0.5 Hz → 0.3 Hz Some preliminary observations

14. Channel 0,1 coincidences Channel 2,3 coincidences SALTA high school students are now analyzing the data identifying stable data run periods bad data channels …and learning about the statistical nature of random events Students will next learn to calculate accidental coincidence rates and statistical error