1. T461 presented at FIWAF SLAC Fluorescence Measurement Test Run (T461) Kevin Reil

2. T461 presented at FIWAF T461 – Collaboration J. Belz 1, Z. Cao 2, P. Chen 3*, C. Field 3, P. Huentemeyer 2, W-Y. P. Hwang 4, R. Iverson 3, C.C.H. Jui 2, T. Kamae 3, G.-L. Lin 4, E.C. Loh 2, K. Martens 2, J.N. Matthews 2, W.R. Nelson 3, J.S.T. Ng 3, A. Odian 3, K. Reil 3, J.D. Smith 2, P. Sokolsky 2*, R.W. Springer 2, S.B. Thomas 2, G.B. Thomson 5, D. Walz 3 1 University of Montana, Missoula, Montana 2 University of Utah, Salt Lake City, Utah 3 Stanford Linear Accelerator Center, Stanford University, CA 4 Center for Cosmology and Particle Astrophysics (CosPA), Taiwan 5 Rutgers University, Piscataway, New Jersey

3. T461 presented at FIWAF The SLAC Accelerator: 3 km long with a klystron approx every 13 m. Delivers up to 50 GeV of e - or e +. The SLAC LINAC Beam Switchyard: T461 located in the FFTB

4. T461 presented at FIWAF The FFTB A 28.5 GeV e - beam is delivered to the FFTB. At the final focus beam cross section is 1  m wide and < 0.1  m high. At T461 location beam is mm scale. Pulse length is pico-second scale. Energy spread is 0.1%. Repetition rate is 10 Hz (occasionally 1 Hz and 30 Hz).

5. T461 presented at FIWAF Setup shielded by lead wall. Beam Current Toroid Upstream. Beam Direction T461 Setup

6. T461 presented at FIWAF T461 Setup Beam passes into an air chamber. Chamber included 4 ports. Two PMT ports and two LED ports for stability tracking. Two additional “blind” PMTs. LED PMT

7. T461 presented at FIWAF T461 Setup LEDs PMTs

8. T461 presented at FIWAF T461 Setup LEDs PMT Beam Gas Flow

9. T461 presented at FIWAF T461 Gas System Pure N 2. Dry Air. Ethelyne. Vacuum Reservoir

10. T461 presented at FIWAF T461 PMT Stability (2.2%).

11. T461 presented at FIWAF T461 PMT Stability (2.2%).

12. T461 presented at FIWAF T461 HV Stability (0.04%). PMT GAIN =e  V  With  6.

13. T461 presented at FIWAF T461 Beam Stability (~2%) x 10 10 e -

14. T461 presented at FIWAF T461 Data Acquisition Signal Cables ADC Board Trigger Logic

15. T461 presented at FIWAF N 2 Decay Time Measurement

16. T461 presented at FIWAF N 2 Decay Time Measurement

17. T461 presented at FIWAF N 2 Decay Time Measurement

18. T461 presented at FIWAF N 2 Decay Time Measurement

19. T461 presented at FIWAF N 2 (in air) Decay Time Measurement

20. T461 presented at FIWAF N 2 Decay Time Measurement

21. T461 presented at FIWAF

22. T461 Preliminary Results

23. T461 presented at FIWAF

24. Klystron Electron gun produces electron flow. Bunching cavity regulates electron flow. Electron bunches excite microwaves at output cavity. Waveguide carries microwaves to accelerator. Electrons absorbed in beam stop. Each klystron is 65 megawatts and operates at 120 Hz.

25. T461 presented at FIWAF Two Mile Accelerator

26. T461 presented at FIWAF

27. Straight Shot Into the FFTB