Transcript Experimental Work at Nevis

Update of the frictional cooling
studies at Nevis Labs
R. Galea
Columbia University
A. Caldwell (Columbia)
Columbia Summer Students:
S. Schlenstedt (DESY/Zeuthen) C. Georgiou
H. Abramowicz (TAU)
D. Greenwald
Y, Ning
W. Serber
I. Shpiro
Frictional Cooling: The idea
Cool m’s where dE/dx a b and
compensate energy loss through Efield: cooling
Below ionization peak dE/dx is
dominated by:
 nuclear recoil
 excitation
 m+ charge exchange, & mcapture
Issues/consequences/comments:
large dE/dx : work with low
density gas
 With E B we will never get below
the peak therefore apply E B

Feb. 5, 2002
R. Galea IIT/FNAL
Frictional Cooling : particle trajectory
calculated with continuous energy loss
Feb. 5, 2002
R. Galea IIT/FNAL
Frictional Cooling: stop the m
need low initial m momenta
Feb. 5, 2002
R. Galea IIT/FNAL
Frictional Cooling Scheme
Optimize: target, phase rotation & cooling channel
Feb. 5, 2002
R. Galea IIT/FNAL
Target System: study II
Feb. 5, 2002
R. Galea IIT/FNAL
Experimental Work at Nevis
• We want to measure the energy loss, the mscapture, test cooling principle
Feb. 5, 2002
R. Galea IIT/FNAL
Feb. 5, 2002
R. Galea IIT/FNAL
MultiWire Proportional Chamber
• Single Wire prototype
constructed, tested with P10
• Ongoing: Multiwire, use Xe gas.
Feb. 5, 2002
R. Galea IIT/FNAL
MicroChannelPlate
• MCP used to measure ms & e
• Use a,b,g sources in 4 MeV p beam at Nevis & 1040 KeV m beam at PSI
MCP: front
side
Accelerating grid