The document describes the Fluorescence detector Array of Single-pixel Telescopes (FAST) project. Some key points: - FAST will consist of an array of single-pixel telescopes to detect ultra-high energy cosmic rays via fluorescence technique. - A prototype was constructed and tested in 2015-2017. Data was collected at the Telescope Array site over 21 km and compared to simulations. - The project aims to build a larger array with more telescopes that could achieve 4 times the exposure of the Telescope Array or 10 times that of the Pierre Auger Observatory. This would allow studies of cosmic rays above 10^19.5 eV. - An update on the project's progress in design

1. ( ), Max Malacari, Justin Albury, Jose A. Bellido, John Farmer,
Aygul Galimova, Pavel Horvath, Miroslav Hrabovsky, Dusan Mandat, Ariel Matalon,
John N. Matthews, Maria Merolle, Xiaochen Ni, Libor Nozka, Miroslav Palatka,
Miroslav Pech, Paolo Privitera, Petr Schovanek, Stan B. Thomas, Petr Travnicek
2017 2017 9 13
FAST 5

2. 2
Fluorescence detector Array of Single-pixel Telescopes
Segmented mirror telescope
Variable angles of elevation – steps.
15 deg 45 deg
✦ >1019.5 eV
✦ (10× Auger or TA×4) ⇒

3. FAST - progress in design and construction
UV Plexiglass Segmented primary mirror8 inch PMT camera
(2 x 2)
1m2 aperture
FOV = 25°x 25°
variable
tilt
Prototype - October 2015
15°
45°
3Joint Laboratory of Optics in Olomouc, Czech Republic
FAST
UV band-pass
filter
1. T. Fujii et al., “Detection of ultra-high energy cosmic ray showers with a single-pixel fluorescence telescope”, Astropart.Phys. 74 (2016) 64-72
2. D. Mandat et al., “The prototype opto-mechanical system for the Fluorescence detector Array of Single-pixel Telescopes”, JINST 12 (2017) T07001

4. 1 FAST (2016 10 )
4http://www.fast-project.org

5. FAST
5
✦ (TA)
✦ 10 MHz, 80 µs
✦ TA
✦ 21 km
Time (100 ns)
0 100 200 300 400 500 600 700 800
-30
-20
Time (100 ns)
0 100 200 300 400 500 600 700 800
-30
-20
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
PMT 2
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
40
PMT 4
80 µs
100
( )
()
FAST
PMT1
PMT2
PMT3
PMT4

6. Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
5
10
15
20
25
PMT1
PMT2
PMT3
PMT4
Simulation (Preliminary)
21 km Data/MC
6
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N -30
-20
-10
0
10
20
30
40
PMT 1
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-30
-20
-10
0
10
20
30
40
PMT 3
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
PMT 2
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
40
PMT 4
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
5
10
15
20
PMT 1
PMT 2
PMT 3
PMT 4
1
284
✦ 284
✦
✦ ( )
PMT
✦ PMT
✦

7. Event 529: log10(E(eV)): 17.86, Zen: 52.0◦
, Azi: -81.0◦
,
Core(19.25, -7.29), Rp: 5.12, Psi: 77.2◦
, Xmax: 569 g/cm2
FoV(780 - 1102), Date: 20161007, Time: 05:38:07.968860386
Event 530: log10(E(eV)): 18.33, Zen: 64.1◦
, Azi: 159.6◦
,
Core(15.32, -9.36), Rp: 1.51, Psi: 28.5◦
, Xmax: 1264 g/cm2
FoV(1795 - 1972), Date: 20161007, Time: 05:38:31.715231263
Event 531: log10(E(eV)): 18.55, Zen: 22.3◦
, Azi: 71.3◦
,
Core(14.02, -11.00), Rp: 3.03, Psi: 72.8◦
, Xmax: 675 g/cm2
FoV(763 - 943), Date: 20161007, Time: 05:44:07.307401117
FAST
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
50
100
150
200 PMT 1
PMT 2
PMT 3
PMT 4
Event 342✦ 201
✦
✦ 7/18 PC
✦ 1 120 18
1
GPS

8. Event 177: log10(E(eV)): 18.51, Zen: 52.67◦
, Azi: 233.42◦
,
Core(1.975, -9.112), S800: 4.65 VEM/m2
, Date: 20170417,
Time: 213338.055271
Event 178: log10(E(eV)): 18.61, Zen: 50.95◦
, Azi: 182.51◦
,
Core(9.896, -9.418), S800: 6.29 VEM/m2
, Date: 20170418,
Time: 021601.225337
✦ 2016 10 2017 1 120 18
✦ 2017 2 7 81
✦ (>35 µs) ⇒
( ) ⇒ 2 PMT
✦ 7
8
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
0
20
40
60
80 PMT 1
PMT 2
PMT 3
PMT 4
Event 186
Event 34: log10(E(eV)): 18.27, Zen: 28.6◦
, Azi: -69.5◦
,
Core(6.56, -13.44), Rp: 9.56, Psi: 115.1◦
, Xmax: 932 g/cm2
FoV(365 - 968), Date: 20170418, Time: 04:31:06.839299599
Event 35: log10(E(eV)): 17.38, Zen: 35.5◦
, Azi: -169.5◦
,
Core(16.58, -9.56), Rp: 2.12, Psi: 57.2◦
, Xmax: 678 g/cm2
FoV(958 - 1066), Date: 20170418, Time: 04:36:56.351646178TA TA

9. Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
40
50
60 PMT 1
PMT 2
PMT 3
PMT 4
Event 63
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
50
100
150
200 PMT 1
PMT 2
PMT 3
PMT 4
Event 718
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
100
200
300
400
500
PMT 1
PMT 2
PMT 3
PMT 4
Event 164
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
500
1000
1500
2000
PMT 1
PMT 2
PMT 3
PMT 4
Event 94
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
40
50 PMT 1
PMT 2
PMT 3
PMT 4
Event 305
9
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
0
20
40
60
80
100 PMT 1
PMT 2
PMT 3
PMT 4
Event 631
ch.1 saturated

10. 10
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
-20
-10
0
10
20
30
40
50 PMT 1
PMT 2
PMT 3
PMT 4
Event 305
Time (100 ns)
0 100 200 300 400 500 600 700 800
/(100ns)p.e.N
0
100
200
300
400
500
PMT 1
PMT 2
PMT 3
PMT 4
Event 164
TA
Event 1165: log10(E(eV)): 17.41, Zen: 34.1◦
, Azi: -8.5◦
,
Core(12.31, -10.00), Rp: 4.89, Psi: 107.5◦
, Xmax: 633 g/cm2
FoV(526 - 1036), Date: 20170626, Time: 09:16:18.550749668
Event 1171: log10(E(eV)): 17.06, Zen: 47.0◦
, Azi: -30.5◦
Core(13.52, -9.46), Rp: 3.21, Psi: 132.5◦
, Xmax: 709 g/cm
FoV(245 - 1270), Date: 20170627, Time: 05:55:55.080425169
Preliminary result
logE=17.8
Rp: 1.6 km
Preliminary result
logE=17.6
Rp: 1.8 km

11. ✦ PMT
✦ 9/16 2
✦ 2
2
2
11
12
By courtesy of Y. Tameda

12. 12
✦ Fluorescence detector Array of Single-pixel Telescopes (FAST)
✦
✦ FAST
✦ 2016 10 2017 1
✦ 21 km Data/MC
✦ 201 25
✦
✦ 9/16 2
✦
✦ TA FAST
✦ TA/Auger Auger