1. Update of the frictional cooling studies at Nevis Labs
R. Galea
Columbia University
A. Caldwell (Columbia)
S. Schlenstedt (DESY/Zeuthen)
H. Abramowicz (TAU)
Columbia Summer Students:
C. Georgiou
D. Greenwald
Y, Ning
W. Serber
I. Shpiro

2. Frictional Cooling: The idea
Cool m’s where dE/dx a band compensate energy loss through E-field: cooling
Below ionization peak dE/dx is dominated by:
nuclear recoil
excitation
m+ charge exchange, & m- capture
Issues/consequences/comments:
large dE/dx : work with low density gas
With we will never get below the peak therefore apply
Feb. 5, 2002
R. Galea IIT/FNAL

3. Frictional Cooling : particle trajectory
calculated with continuous energy loss
Feb. 5, 2002
R. Galea IIT/FNAL

4. Frictional Cooling: stop the m
need low initial m momenta
Feb. 5, 2002
R. Galea IIT/FNAL

5. Frictional Cooling Scheme
Optimize: target, phase rotation & cooling channel
Feb. 5, 2002
R. Galea IIT/FNAL

6. Target System: study II
Feb. 5, 2002
R. Galea IIT/FNAL

7. Experimental Work at Nevis
We want to measure the energy loss, the m- scapture, test cooling principle
Feb. 5, 2002
R. Galea IIT/FNAL

8. Feb. 5, 2002
R. Galea IIT/FNAL

9. MultiWire Proportional Chamber
Single Wire prototype constructed, tested with P10
Ongoing: Multiwire, use Xe gas.
Feb. 5, 2002
R. Galea IIT/FNAL

10. MicroChannelPlate MCP used to measure ms & e
Use a,b,g sources in 4 MeV p beam at Nevis & KeV m beam at PSI
MCP: front side
Accelerating grid