1. Cooling Time Measurements
Test Storage Ring
M.P.I. Heidelberg
2-4 December 1998

2. Goals
To measure to cooling times with an expanded electron beam varying :
expansion factor
electron beam density
initial emittance of the ion beam

3. Machine Layout Similar to LEAR. L=55.4 m, 4 straight sections
injection/ejection
diagnostics
electron cooling
laser cooling
(Qh, Qv) = (2.841, 2.799)

4. Electron Cooling Adiabatic gun with expansion Bmax in gun = 1 T
B in drift section = 418 G
Maximum expansion factor of 25
Cathode diameter = mm
Ie max = 200 mA (anode at ground potential)

5. Diagnostics BCT to monitor the ion beam intensity
Longitudinal Schottky PU for longitudinal cooling times
Ionisation profile monitor for transverse cooling times

6. Experimental Parameters
Beta functions :
5.8 m at BIPM
5.4 m at ECOOL
D = 0.3 m at ECOOL
Multi-turn injection
timing and septum adjusted to have larger emittances at injection
C6+ at MeV/c/u
v = c
Eecool = 3.35 keV

7. Experimental Parameters

8. BIPM profile

9. Schottky Spectrum

10. Some Results on Transverse Cooling