SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Instrumentation V
HK 14.2: Gruppenbericht
Dienstag, 21. März 2023, 17:30–18:00, SCH/A.101
LHCspin: First Tests of the SMOG2 gas target at the LHC — •Erhard Steffens1, Paolo Lenisa2, Vito Carassiti2, Giuseppe Ciullo2, Pasquale Di Nezza3,4, Luciano L. Pappalardo2,4, and Marco Santimaria3,4 — 1FAU, Erlangen-Nürnberg, Germany — 2U. Ferrara and INFN, Italy — 3INFN Lab. Nat. di Frascati, Italy — 4LHCb Collaboration, CERN
The LHCspin project aims at unpolarized (SMOG2) and polarized fixed-target measurements by means of a gas target upstream of the LHCb detector, close to the vertex detector VELO. The forward geometry of the LHCb spectrometer (2<η<5) allows for the reconstruction of particles produced in fixed-target collisions, with CM energies from √sNN = 72 GeV with Pb beam, to √s = 115 GeV in pp collisions.
SMOG2 is an openable storage cell with wake field suppressors and unpolarized gas feed system, producing a localized pressure bump inside the 200mm long storage tube, with i.d. 10 mm in the closed state. The two halves of the cell are connected to and moving with the VELO detector boxes, opening during beam injection. The 7 TeV/1A beam traversing the target might develop instabilities which must be suppressed by a suitable coating and shape of the conducting surfaces. - The target was successfully tested with beams (p, Pb) in November 2022. It has been verified that beam-beam and beam-gas events can be measured simultaneously by the detector.