1. Hee Jin Park (SUNY Stonybrook, BNL) Ilias Efthymiopoulos (CERN)
Timing Issue for Mercury Target
Hee Jin Park (SUNY Stonybrook, BNL)
Ilias Efthymiopoulos (CERN)
Adrian Fabich (CERN)

2. • • • ••• • • ••• ••• • • Super Cycle Structure Super Cycle User MERIT
SC 1
SC N
SC 2
MERIT
MERIT
MERIT • • •
••• • •
~20 s
~20 s
~20 s
Super Cycle User MERIT
MERIT
•••
•••
User Cycle1
User Cycle n •
User Cycle2 •
User Cycle15
Δt= n (# of slot)×1.2s
Super Cycle Length (Currently foreseen for 2007)
16.8s (FT)
18s (FT+CNGS commissioning)
22.8s (FT+CNGS LI)
34.8s (FT+CNGS HI)
43.2s (LHC filling)
Run for days, 2006
Run for 30 min or test period

3. • • • • • ••• • PS User Cycle Beam Shape & Structure 800 ms 1.2 s time
warning xx (time delay to beam ms) : 2ms
B(t) • •
Triggering Signal : TTL standard logic •
800 ms •
Finalized with hardware
1.2 s •
time
t=0 for MERIT
Jitter : 250 ns
Extraction time
Beam Shape & Structure
50 ns
Bunch length : 50 ns •
•••
~800ms ns

4. ••• • • • ••• Time Delay 20 s 20 s Super Cycle : 20 s – Time Delay
Camera Trigger :
n×1.2 s ms
Magnet Trigger
Delay Unit
Hg Trigger
Proton Synchrotron
MERIT
•••
Distance ≈ 400 m
Cable Delay = 5 ns/m
= 2 μs/400m
Beam Travel Delay = 3.3 ns/m
= 1.32 µs/400m
Signal to Beam Delay ≈ 1.32 – 2 = µs/400m
SC for MERIT
SC for MERIT • • •
•••
20 s
20 s
Signal to MERIT
Adjust at Next Beam Shot
Beam

5. • • • • • Operation Flat Top Region of Magnetic Field
: 8.5 s ~ 9.5 s (1 sec) ?
What precision is required ?
Tolerance ? • •
Beam shot ?
Mercury Jet Velocity Profile at Target
Velocity
V=20m/s • •
8.5 s
Precision ?
Tolerance ?
Beam shot ? •
Flat Top Region of Steady Jet flow
: 8.5 s ~ 9.5 s (1 sec) ?
9.5 s
Time
10 s

6. • • • Signal Sequence for Mercury Target SC Δt 20 s
Low Intensity
Regular Intensity • • •
Beam Δt
20 s
Trigger Camera
Delay : 20s - n×1.2 s ms – Jitter -1μs ± 300 ns
Trigger Hg Loop
Delay : Ex. 20 s – 9.0 s ± 1ms
Trigger Magnet
Delay : Ex. 20 s – 9.0 s ± 1ms
Trigger Detector
20 s
Delay : 20s - n×1.2 s ms – Jitter -1μs ± 300 ns
variable
Beam Inhibit (On/Off)
Δt≤3.6
Δt_start ≥ 3.6s
Δt_stop
No Beam
to MERIT
MERIT Beam