This research was sponsored by the National Science Foundation Grant NSF PHY-931478

Bent, R.D.

Blomgren, J.

Brown, J.

Hardie, G.

Heimberg, P.

Homolka, J.

Jacobsen, E.

Nann, H.

Pancella, P.

Rehm, K.E.

Saber, M.

Schneider, R.

Segel, R.E.

Sun, C.

Yu, Z.

English

IUScholarWorks

RECOIL-ION DETECTION SYSTEM 
P. Heimberg, R.E. Segel, and Z. Yu 
Northwes tern  University, Evans ton ,  Illinois 60201 
J. Brown and E. Jacobsen 
Prince ton  University, Princeton,  N e w  Jersey  0854 0 
K.E. Rehm 
Argonne Nat ional  Laboratory, Argonne,  Illinois 60499 
J.  Homolka and R. Schneider 
Physik Depar tment ,  Technische Universi tat  Munchen ,  G e r m a n y  
G. Hardie and P. Pancella 
W e s t e r n  Michigan University, Kalamazoo,  Michigan 49008  
C. Sun, H. Nann, R.D. Bent, J. Blomgren, and M. Saber 
Ind iana  Universi ty  Cyclotron Facility, Bloomington,  Indiana 474 0 8  
Experiment CE06, "Measurement of Nuclear React ions Using Recoil Detect ion," is 
being set up in the T-section of the ring, where the magnet that bends the primary beam 
6' sweeps the recoils into a detection system. A schematic of the experimental layout is 
shown in Fig. 1. The particles first pass through a parallel grid avalanche counter (PG AC) 
Figure 1. Layout, not to scale, of experiment CE06. 
which measures the time and position of the particles emerging from the magnet. The 
PGAC has 0.9-micron entrance and exit foils and has a time resolution of 600 ps. After- 
traversing a 50-cm flight path, the recoils pass through a proportional counter (PC which 
measures dE/dx. Position, time, and energy information will be obtained from an array 
of silicon microstrip detectors which are mounted in the same housing as the PC. 
Each microstrip detector is made up of 50 strips 5 cm long and 1 mm wide. A readout 
scheme has been developed in which inductors are placed between each strip, thus forming 
a delay line, and the time difference between the two ends indicates the position of the 
event along the detector. The circuitry is shown in Fig. 2 and a time spectrum taken with 
5.4 MeV alpha particles is shown in Fig. 3, where it can be seen that every strip is cleanly 
resolved. The time resolution is about 1 ns for 5.4 MeV alphas, and the energy signal is 
taken off the back. 
An alternate readout scheme has been developed in which the signal from each strip is 
amplified and passed through a discriminator. The SMD printed circuit board technique 
has been used to develop a small size, low cost, low power system which can, if necessary, 
be run in vacuum. Each strip is unambiguously identified and a time resolution of 1.5 ns 
was achieved with 5 MeV alphas. 
I Energy Pro-Amp I 
M a r -  6 Monolithic Chip 1 Fa l t  Pre-Amp I 
Mu1 t i  -St  ri p Si Detector 
1 uH Inductors I 
Figure 2. Schematic of readout of Si microstrip detectors. 
150 
f ime Spectrum w i t h  5.4 MeV Alpha Particles 
8000 1 
400 600 
Channel Number 
Figure 3. Time difference spectrum, in arbitrary units, between the two ends of a Si 
microstrip detector, using the circuitry shown in Fig. 2. The spectrum was taken with 
5.4 MeV alpha particles. 


Recoil-Ion Detection System

https://scholarworks.iu.edu/dspace/bitstream/2022/628/1/iucf1991-1992_149-151.pdf

Recoil-Ion Detection System

Abstract

Similar works

Full text

Available Versions

IUScholarWorks