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

Journal Article · Wed Feb 06 00:00:00 EST 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2888083· OSTI ID:21055195

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 Kernphysik, Universitaet zu Koeln, Zuelpicher Str. 77, 50937 Cologne (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 in summer 2005. 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-vector p-vector {yields}dp and d-vector p-vector{yields}(dp{sub sp}){pi}{sup 0} reactions showed that events from 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{yields}d{pi}{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 achieved target thickness 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: 21055195
• Journal Information: AIP Conference Proceedings, Vol. 980, Issue 1; Conference: PSTP2007: 12. international workshop on polarized ion sources, targets and polarimetry, Upton, NY (United States), 10-14 Sep 2007; Other Information: DOI: 10.1063/1.2888083; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ALUMINIUM
ATOMIC BEAM SOURCES
ATOMIC BEAMS
COSY STORAGE RING
DEUTERON REACTIONS
DEUTERONS
DIPOLES
ELECTRON COOLING
ELECTRONS
LAMB SHIFT
MAGNETIC SPECTROMETERS
MAGNETS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PIONS NEUTRAL
POLARIZATION
POLARIZATION-ASYMMETRY RATIO
POLARIZED BEAMS
STOCHASTIC COOLING
TARGET CHAMBERS