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

Berg, G.P.A.

Foster, C.C.

Lincicome, E.

Rinckel, T.

English

IUScholarWorks

planned measurements nea.r production threshold. Each bar is viewed on one end by a 
single 3 inch photomultiplier. Two of the five bars were used in the February run. In 
a n  earlier beam test with 90 MeV deuterons the energy resolution was measured to be 
2.0 to 2.2% (depending on position). Since the results from the current design were quite 
satisfa.ctory the final three bars use an identical design. 
The AE scintillator was designed to give the pr imaq timing benchmark for the final 
experiment. Very fast phototubes (Amperex XP2020) have been purchased towad this 
end, with a design goal of 250 ps timing for the detector overall. This detector is currently 
under assembly and will be ready in summer 1990. 
PROGRESS ON T-SITE CONSTRUCTION FOR EXPERIMENT CEO3 
C.C. Foster, G.P.A. Berg, T.  Ri~ickel, and E. Lincicome 
Preparation of the T-site of the Cooler ring for experiment CE03, to study the reaction 
p+p -+ p+n+.lr+, involves replacement of two three-degree bending magnets with a new 
six-degree magnet. This magnet will be used as a ring bending magnet and to separate 
charged particles of low magnetic rigidity and neutral particles from the circulating beam. 
It is also designed to be used as a spectrometer to detect recoiling residual nuclei and 
scattered particles over a wide range of scattering angles and momenta with high accuracy. 
Fig. 1 shows a top view of the new T-site magnet. The rays of the circulating beam, 
9 13 
Figure I. Top view of the new T-section magnet. The outline of the yoke, coils, and pole 
tips anre shown together with the vacuum cha~nber assembly. 
6 DEGREE MAGNET. 1 1 
PUMP. A \ 
TARGET VESSEL. ACUUM VESSEL. 
AGNET BEND POINT. 
I '  I I 
Figure 2. The new- six-degree T-section magnet, vacuum chamber, target box, pumps and 
support in final assembled form as viewed from the outside of the Cooler ring. 
the 0-degree neutron line and the asymptotic most backward ray are indicated. Fig. 2 is a 
side view of the six-degree magnet mounted on its support stand and assembled with its 
target box and pumps as it will be in its final configuration in the cooler ring. 
We plan to assemble the magnet on the top portion of its stand, carefully map the 
magnetic field of the magnet, and perform ramp tests and dynamic magnetic field mea- 
surements without the magnet vacuum chamber or target vacuum box in place. Then, we 
will install the magnet vacuum chamber and check the magnetic fields by performing an 
abbreviated field map. If no significant differences are observed between the maps, the 
target vacuum box and its pumps will be a.dded and the stand completed. Vacuum tests 
will be ~erformed and alignment fiducia-1s established. Finally, the entire assembly will be 
installed in the T-section of the cooler ring and aligned as a unit. 
Preliminary maps of the field in 50 ampere steps up to the power supply current 
limit and dyna,mic field shape measurements have been performed and analysis is neaxing 
completion. Ramping tests of the power supply exhibited some fa-ults which have been 
corrected. The magnet vacuum chamber has been fabricated and is awaiting vacuum 
tests. In order to allow test measurements with beam in the T-site, the target vacuum 
box was installed at a temporary location near the three-degree magnets. Detailing of the 
lower portion of the support stand is proceeding in the drafting shop. A support stand for 
the neutron hodoscope has been designed and is awaiting fabrication in the machine shop. 
MAGNETIC SPECTROMETER FOR THE IUCF COOLER 
G.P.A. Berg and D.W. Miller 
The IUCF Long Range Planning Comruittee (LRPC) has formed two working groups 
to study physics prospects at the Cooler arid the equipment needed. Tlle Cooler Spec- 
trometer Working Group, in particular, was asked to study the possibilities of a magnet 
spectrometer at the Cooler and its physics irnpact. The working group came together in 
Bloornington for a meeting to discuss physics issues and the feasibility of a medium reso- 
lution, moderate solid angle spectrometer which would allow O0 measurements of protons 
from the (d,2He) reaction, protons for tagged neutrons and recoil reaction products at 
backward angles. The working group consisted of the following members: B.D. Anderson, 
J.W. Watson, Kent State University, D. Frekers, TRIUMF, C.A. Gagliardi, Texas A&M, 
K.H. Hicks, Ohio University, E.R. Sugarbaker, Ohio State University, S.W. Wissink, G .P.A. 
Berg and D.W. Miller, IUCF. In addition, the following IUCF consultants helped with the 
report: R.D. Bent, L.C. Bland, D. DuPla,ntis, C.D. Goodman, R.E. Pollock, P. Schwar~~ldt, 
and K.  Solberg. The results were presented to the Program Advisory Committee and the 
LRPC in December 1989 and are published as IUCF Internal Report 487. 
Because the strength of the 6" magnet in the Cooler T section is not adequate to 
provide enough separation between the beam and outgoing protons to a.ccommodate a O0 
spectrometer, it was decided to propose a Chicane (Fig. 1) in the Cooler S region. After 
cc.)rnpletion of a second Siberian S11a.ke experiment (CE15) in the Cooler S region, this 
straight Cooler section will become available for the installation of a Cooler spectrometer. 
111 the S region two rna,gnets CM-1 and CM-3 are needed to bend the beam out of the 
st,rnight sectio~i and back into the ring. The Chicane magnet CM-2 serves as separa.tion 
magnet. All three chicane magnets have 1a.minated yokes and pole pieces because they will 
be ramped with the beam energy in the same way as all other ring magnets. 
Tlle Chicane arrangement is shown it1 Fig. 1 for the nia~ritnunl beam bending angle 
of 24" in CM-2. This provides sufficie~lt separation of beam deuterons up to 390 MeV and 
2He protons of half the bea,m momentum to allow a magnetic analysis of the protons in a. 
subsequent spectrometer system with large solid angle and medium resolution. Calcula- 
tions show that a Chicane angle of up to 24O is compa.tible with Cooler operagtion if certain 


Progress on T-Site Construction for Experiment CE03

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Progress on T-Site Construction for Experiment CE03

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