First Experiments with the Polarized Internal Gas Target (PIT) at ANKE/COSY

Journal Article · Tue Aug 04 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3215786· OSTI ID:21344470

Engels, R; Lorentz, B; Prasuhn, D; Rathmann, F; Sarkadi, J; Schleichert, R; Seyfarth, H; Stroeher, H ^[1]; Chiladze, D ^[2]; Dymov, S ^[3]; Grigoryev, K; Mikirtychyants, M ^[1]; Kacharava, A ^[4]; Klehr, F ^[5]; Mikirtychyants, S; Vasilyev, A ^[6]; Schieck, H Paetz gen. ^[7]; Steffens, E ^[4]

---

1. Institut fuer Kernphysik, Forschungszentrum Juelich, Leo-Brandt-Str. 1, 52425 Juelich (Germany)
2. High Energy Physics Institute, Tbilisi State University, 380662 Tbilisi (Georgia)
3. Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
4. Physikalisches Institut II, Universitaet Erlangen-Nuernberg, 91058 Erlangen (Germany)
5. Zentralabt. Technologie, Forschungszentrum Juelich, Leo-Brandt-Str. 1, 52425 Juelich (Germany)
6. Petersburg Nuclear Physics Institute, Orlova Rosha 2, 188300 Gatchina (Russian Federation)
7. Institut fuer Kernphaysik, Universitaet zu Koeln, Zuelpicher Str 77, 50937 Koeln (Germany)

For future few-nucleon interaction studies with polarized beams and targets at COSY-Juelich, a polarized internal storage-cell gas target was implemented at the magnet spectrometer ANKE. First commissioning of the polarized Atomic Beam Source (ABS) at ANKE was carried out and some improvements of the system have been done. Storage-cell tests to determine the COSY beam dimensions have been performed. Electron cooling combined with stacking and stochastic cooling have been studied. Experiments with N{sub 2} gas in the storage cell to simulate the background produced by beam interaction with the aluminum cell walls were performed to investigate the beam heating by the target gas. The analysis of the d-vectorp-vector->dp and d-vectorp-vector->(dp{sub sp})pi{sup 0} reactions showed that events from different positions of the extended target can be clearly identified in the ANKE detector system. The polarization of the atomic beam of the ABS, positioned close to the strong dipole magnet D2 of ANKE, was tuned with a Lamb-shift polarimeter (LSP) beneath the target chamber. With use of the known analyzing powers of the quasi-free np->dpi{sup 0} reaction, the polarization in the storage cell was measured to be Q{sub y} = 0.79+-0.07 in the vertical stray field of the D2 magnet acting as a holding field. The target thickness achieved was 2x10{sup 13} atoms/cm{sup 2} for one hyperfine state populated in the ABS beam only. With a COSY beam intensity of 6x10{sup 9} stored polarized deuterons in the ring, the luminosity for double polarized experiments was 1x10{sup 29} cm{sup -2} s{sup -1}.

• OSTI ID: 21344470
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1149; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATOR FACILITIES
ACCELERATORS
ATOMIC BEAM SOURCES
ATOMIC BEAMS
BARYON-BARYON INTERACTIONS
BEAM COOLING
BEAM LUMINOSITY
BEAM MONITORING
BEAM PROFILES
BEAMS
BOSONS
CHARGED PARTICLES
COSY STORAGE RING
CYCLIC ACCELERATORS
DEUTERONS
DIMENSIONLESS NUMBERS
ELECTRON COOLING
ELECTRON SOURCES
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MAGNETIC SPECTROMETERS
MEASURING INSTRUMENTS
MESONS
MONITORING
NEUTRAL BEAM SOURCES
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE SOURCES
PIONS
PIONS NEUTRAL
POLARIMETERS
POLARIZATION
POLARIZATION-ASYMMETRY RATIO
POLARIZED BEAMS
POLARIZED TARGETS
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION SOURCES
SPECTROMETERS
STOCHASTIC COOLING
STORAGE RINGS
SYNCHROTRONS
TARGET CHAMBERS
TARGETS