SLAC Fluorescence Measurement Test Run T461

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SLAC Fluorescence Measurement Test Run (T461)

• Kevin Reil

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T461 Collaboration
J. Belz1, Z. Cao2, P. Chen3, C. Field3, P.
Huentemeyer2, W-Y. P. Hwang4, R. Iverson3,
C.C.H. Jui2, T. Kamae3, G.-L. Lin4, E.C. Loh2,
K. Martens2, J.N. Matthews2, W.R. Nelson3, J.S.T.
Ng3, A. Odian3, K. Reil3, J.D. Smith2, P.
Sokolsky2, R.W. Springer2, S.B. Thomas2, G.B.
Thomson5, D. Walz3 1University of Montana,
Missoula, Montana 2University of Utah, Salt Lake
City, Utah 3Stanford Linear Accelerator Center,
Stanford University, CA 4Center for Cosmology and
Particle Astrophysics (CosPA), Taiwan 5Rutgers
University, Piscataway, New Jersey
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The SLAC LINAC
The SLAC Accelerator 3 km long with a klystron
approx every 13 m. Delivers up to 50 GeV of e- or
e.
Beam Switchyard T461 located in the FFTB
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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 lt 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).
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T461 Setup
Setup shielded by lead wall. Beam Current Toroid
Upstream. Beam Direction
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T461 Setup
LED
Beam passes into an air chamber. Chamber included
4 ports. Two PMT ports and two LED ports for
stability tracking. Two additional blind PMTs.
PMT
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T461 Setup
LEDs
PMTs
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T461 Setup
LEDs
Beam
Gas Flow
PMT
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T461 Gas System
Vacuum Reservoir
Pure N2. Dry Air. Ethelyne.
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T461 PMT Stability (2.2).
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T461 PMT Stability (2.2).
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T461 HV Stability (0.04).
PMTGAINe?V? With ??6.
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T461 Beam Stability (2)
x 1010 e-
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T461 Data Acquisition
Signal Cables ADC Board Trigger Logic
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N2 Decay Time Measurement
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N2 Decay Time Measurement
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N2 Decay Time Measurement
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N2 Decay Time Measurement
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N2 (in air) Decay Time Measurement
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N2 Decay Time Measurement
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T461 Preliminary Results
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Klystron
Each klystron is 65 megawatts and operates at 120
Hz.
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.
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Two Mile Accelerator
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Straight Shot Into the FFTB