Photodesorption experiments on SSC collider beam tube configurations
- Superconducting Super Collider Lab., Dallas, TX (United States)
- AN SSSR, Novosibirsk (Russian Federation). Inst. Yadernoj Fiziki
- Brookhaven National Lab., Upton, NY (United States)
Experimental measurements of photodesorption coefficients of H{sub 2}, CH{sub 4}, CO and CO{sub 2} are being done to obtain data necessary to predict the vacuum performance of the Collider. Experiments have been done or are planned for warm tubes (i.e. room temperature), cold tubes (i.e. 4.2 K) and liner configurations (i.e. 4.2 K, 20 K and 80 K). Two synchrotron radiation beamlines have been constructed on the VEPP-2M storage ring at BINP, Russia. The photon critical energy is 284 eV, as in the SSC Collider, angle of incidence is 10 mrad. To date approximately fifteen warm beam tubes have been tested, including elecrodeposited Cu, high purity bulk Cu and Nitronic 40 SS, several cleaning procedures, with and without in-situ baking and with and without magnetic field. The maximum integrated photon dose was achieved was 2{center_dot}10{sup 22} photons/m on the high intensity beamline. Several experiments have been done on the VUV ring at BNL to check a subset of the BINP data and to extend the integrated photon flux up to 10{sup 23} photons/m, or 100 days of SSC operation. The data from the warm experiments will be used to evaluate the best tubes to be used in the more time consuming cold experiments.
- Research Organization:
- Superconducting Super Collider Lab., Dallas, TX (United States); AN SSSR, Novosibirsk (Russian Federation). Inst. Yadernoj Fiziki
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC35-89ER40486
- OSTI ID:
- 10158752
- Report Number(s):
- SSCL-Preprint-378; CONF-930511-29; ON: DE93014107
- Resource Relation:
- Conference: PAC `93: international particle accelerator conference,Washington, DC (United States),17-20 May 1993; Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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