ALFA Beam Based Alignment

Preparation (e-mail from Sune Jakobsen)

The ALFA beam based alignment for β* = 19 m optics is scheduled to happen Monday (7.06.2015) morning at 8:00. Some details of what this implies for operation is available on the agenda for tomorrows daily run meeting:

https://indico.cern.ch/event/400282/

After alignment of the first station it is foreseen to position it at about 6 sigma and take OD-alignment data while the other stations are being aligned. A scan of the gain (via high voltage) is planned to see if “cross talk/noise” could be lowered with a smaller gain to provide better OD data quality. We might also add other commissioning of the OD if times/rates allows.

Alignment on 9.06.2015 (e-mail from Sune Jakobsen)

The ALFA beam based alignment for β* = 19 m was done during the night. Some details is available here:

https://atlasop.cern.ch/elisa/display/264176

from Summery of Roman Pot alignment:

"It was observed for beam 1 that the number of sigma measured at the Roman Pots was about 1 larger than at the primary collimator."

The run is also summarized in the ATLAS weekly RC:

https://indico.cern.ch/event/396422/

*A huge amount of ALFA PEB (partial event building) data was collected. This also included data with the TRT and with LHCf triggering combined with ALFA.*

There is still one loss map which include ALFA to do.

-- GrzegorzPawelGach - 2015-06-09

Edit | Attach | Watch | Print version | History: r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r1 - 2015-06-09 - GrzegorzPawelGach
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Main All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright &© 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback