LHCspin: Unpolarized gas target SMOG2, and prospects for a polarized gas target at the LHC

Steffens E, Di Nezza P, Santimaria M, Carassiti V, Ciullo G, Lenisa P, Pappalardo LL, Tagliente G (2023)

Publication Type: Conference contribution

Publication year: 2023

Journal

PoS - Proceedings of Science SISSA

Publisher: Sissa Medialab Srl

Book Volume: 433

Conference Proceedings Title: Proceedings of Science

Event location: Mainz, DEU

Abstract

The status of the first phase of LHCspin is discussed, based on an unpolarized gas target - SMOG2 -, an upgrade of the previous SMOG system. It consists of an openable 20 cm long storage tube in front of the VELO detector. A known gas flow from a gas feed system is injected into the tube's center, producing a localized triangular density distribution. First tests of the SMOG2 system with LHC beam and H2, He, Ne and Ar gas have been performed. The target system and the precision for setting the target areal density are presented. - In the second part, design considerations for a polarized gas target at the LHC are presented. The fact that the initial tests worked as expected is a strong confirmation that the storage cell/tube is a viable concept compatible with LHC conditions. For the beam stability, very few coatings of surfaces close to the LHC beam are accepted. The SMOG2 cell is coated with amorphous Carbon (a-C). It is an open question whether this coating might be used for a polarized target cell. In order to circumvent the coating problem, a free-beam PGT within the present VELO-vessel has been presented. This could be a reasonable starting point for a Spin program at the LHC.

Authors with CRIS profile

Erhard Steffens Naturwissenschaftliche Fakultät

Involved external institutions

National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) IT Italy (IT) Università degli Studi di Ferrara IT Italy (IT)

How to cite

APA:

Steffens, E., Di Nezza, P., Santimaria, M., Carassiti, V., Ciullo, G., Lenisa, P.,... Tagliente, G. (2023). LHCspin: Unpolarized gas target SMOG2, and prospects for a polarized gas target at the LHC. In Proceedings of Science. Mainz, DEU: Sissa Medialab Srl.

MLA:

Steffens, Erhard, et al. "LHCspin: Unpolarized gas target SMOG2, and prospects for a polarized gas target at the LHC." Proceedings of the 19th International Workshop on Polarized Sources, Targets and Polarimetry, PSTP 2022, Mainz, DEU Sissa Medialab Srl, 2023.

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