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x>2 proposal
SRC: x > 2 proposal
preparation for PAC 33
List of issues/comments: click here (meeting on 12/07/07)
Kinematics choice: click here.
---> Incident energy of 3.6GeV seems to be the best for our physics goals
Targets
Target
| 2H |
3He |
4He |
12C |
40Ca |
48Ca |
Thickness
| 20cm |
20cm |
20cm |
2%RL (0.50cm) |
4%RL (0.43cm) |
4%RL (0.43cm) |
Temperature
| 22.0 |
8.0 |
8.0 |
na |
na |
na |
pressure
| 22 psia |
200 psia |
200 psia |
na |
na |
na |
Density (g/cm3)
| 0.167 |
0.069 |
0.114 |
1.90 |
1.54 |
1.54 |
Max. Current (μA)
| 60 |
60 |
60 |
80 |
40 |
40 |
For cryotargets, an effective length of 15cm was used to generate the physics rates
Kinematics list
kin
| angle |
P0 |
Target list |
time (hrs) |
Spectro |
#1
| 15.0 |
3.350 |
all |
8.4 |
L |
#2
| 17.0 |
3.310 |
all |
10.7 |
L |
#3
| 19.0 |
3.165 |
all |
12.7 |
L |
#4
| 19.0 |
3.270 |
all |
11.2 |
L |
#5
| 21.0 |
3.100 |
all |
13.7 |
R |
#6
| 21.0 |
3.220 |
no 2H |
17.6 |
L |
#7
| 23.0 |
3.030 |
all |
27.2 |
R |
#8
| 23.0 |
3.170 |
no 2H |
35.3 |
L |
#9
| 25.0 |
3.120 |
no 2H |
70.5 |
L |
#10
| 27.0 |
3.070 |
no 2H |
123.4 |
R |
#11
| 29.0 |
3.010 |
no 2H |
61.7+61.7 |
L+R |
Time needed: about 12 days (with 29o) or about 9 days (without 29o but we can add time at 27o instead)
Taking into account parallel running of Left and Right arms:
- 228 hours (9.5days) of main data taking
- 4 hours of optics on carbon foils (30 min. per kin)
- 15 hours on Al empty cell (20% of 3He running time)
- 2 hours for beam energy measurement
- 2 hours for 2 BCM calibrations
- 8 hours: target swap 3He --> 2H + 4He
- 8 hours: 8*5 (1st part) + 6 (2nd part) = 46 target motions assuming 10 min. each
- 14 hours kinematic changes (momentum and angle) assuming 1 hour each (7 hours per part)
281 hours (about 12 days total beam time) = 228 hours (data taking) + 33 hours (bkg+calib) + 30 hours (configuration change)
Expected results
---> Major differences with CC version: 4%RL for calcium targets, added 4He, and optimized time using:
NA = N3 at about x=2.25 for kinematics with xmax=3.0
NA = N3 at about x=1.5 for kinematics with xmax=2.0
N2 = N3 at about x=1.5 to determine 2H running time
with NA= number of physics events for nucleus A.
note: 3He is always the reference time.
Plots: pdf (ps file)
Table (rates and time): ps file
Patricia Solvignon
Last modified: Wed Jan 23 16:01:14 EST 2008