1. G0 Accelerator Planning Meeting (11/1/05)
Agenda:
1. Introduction & Proposed Beam Specifications (Grames/Pitt/Suleiman - 15 min) 2. Proposed Accelerator Configuration [non-parity quality concerns] (Freyberger- 10 min) 3. Polarized Source Setup [parity quality concerns] (Poelker/Suleiman - 10 min) 4. Injector Matching [parity quality concerns] (Chao - 10 min) 5. Engineering Issues (Merz/Lauze - 10 min) 6. Software Issues (Bickley/Roblin- 10 min)

2. What is new for backward angle?
499 MHz vs. 32 MHz
80 uA (100 uA) vs. 40 uA
Lower energy 687 MeV & 360 MeV (vs. 3 GeV)
Superlattice (85%) vs. Strained (75%) photocathodes
Ti:Sap & Fiber laser options
PQB specs reduced ~2x <-> Asymmetries larger ~10x
PQB dominated by source setup and injector matching
G0 spectrometer reversed

5. Scheduling (intended accelerator schedule, but not yet firm)
Pre G0 Run
Accelerator down January-February 5
G0 laser table setup
G0 injector matching setup
CASA G0 1-pass G0 setup
Hall B, then Hall A (using Hall C laser) run period 2/6-3/13
Hall C nominally down until 3/14
Best estimate for early beam delivery for checkout 3/1
First Run Period (687 MeV, 1 pass, high Q2 measurement)
G0 accelerator commissioning 3/15 & 3/16
G0 physics commissioning 3/17-4/2 (3 polarized expt’s)
G0 physics production run 4/7-5/1 (2 & 3 polarized expt’s)
Second Run Period (360 MeV, 1 pass, low Q2 measurement)
~2 weeks later, start w/ ~2 days accelerator commissioning
Special accelerator setup, G0 run only 5/16-8/1
Third (and final) Run Period (687 MeV, 1 pass, high Q2 measurement)
Begin ~9/22-12/22 (3 experiments)

6. Parity Quality Beam Specs
Property
Nominal
Deviation
(slow)
Helicity
“noise” (2)
1/30th
Other
“noise”
e.g. 60 Hz
Run
Averaged (3)
Forward
Specified
Forward Achieved
Energy (1)
687, 360 MeV
±0.1%
0.003%
(105um)
0.01%
(350 um)
<5x10-8
(180 nm)
<75 eV
29 ± 4 eV
Energy Spread
<0.1%
CW Intensity
80 mA
(100 uA)
± 5%
0.2%
1.0%
<2 ppm
<1 ppm
-0.14 ± 0.32 ppm
Position at Target
“0”
± 0.2 mm
20 mm
0.2 mm
<40 nm
<20 nm
4 ± 4 nm
Angle at Target
± 0.05 mrad
2 mrad
0.02 mrad
<4 nrad
<2 nrad
1.5 ± 1 nrad
Divergence at Target
100 mrad
± 50%
Unrastered RMS Size at Target
200 mm
± 25%
4 mm ?
Polarization
>70%
Halo at Target
<10-6 outside 3 mm radius
<0.2% of
nominal
Dispersion at 3C12 35 mm/% and <1 mm/% at target.
Standard deviation of difference between adjacent samples (each 1/30th)
E.G, number of pairs in run, N = 15 per sec * 3600 sec/hr * 700 hr = 37.8 Msamples, and 20 mm/Sqrt(N) ~ 3 nm

7. G0 Diagnostics Girder

8. G0 Halo Girder