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Jeremy, et al., We will need to monitor the analyzing dipole current. I assume this is an EPICS variable, or should be. We will also be mounting a Hall probe onto the SVT support plate. This will give us a direct measure of the magnetic field strength. Deviations from nominal settings will give us the scaling factor to use for the simulation/reconstruction. I would use the magnet current as the primary and the Hall probe as check, but we can monitor both during early commissioning. Norman ________________________________________ From: [log in to unmask] <[log in to unmask]> on behalf of Nathan Baltzell <[log in to unmask]> Sent: Monday, February 2, 2015 5:24 PM To: McCormick, Jeremy I. Cc: hps-software Subject: Re: Bfield conditions Hi Jeremy, > current - the beam current in amps I think beam current is not related to chicane settings. > But I'm not sure where this information all comes from... Empirical numbers are magnet currents, from which comes a scale factor relative to some defined nominal value. > current - Will this be in the data stream for the upcoming runs? Or should we access it through the MYA command line tool? (Obviously prefer into the data stream.) We will be putting various EPICs variables, including chicane current readbacks, into EVIO every few seconds for the next run. How we will parse it needs to be written and tested. -Nathan On Feb 2, 2015, at 7:44 PM, "McCormick, Jeremy I." <[log in to unmask]> wrote: > -----Original Message----- > From: McCormick, Jeremy I. > Sent: Monday, February 02, 2015 4:43 PM > To: 'Nathan Baltzell' > Cc: Graham, Mathew Thomas; Graf, Norman A. > Subject: RE: Bfield conditions > > Hi, Nathan. > > I'll CC a couple people who might be interested in this... > > It was requested that I add B-field information to the conditions system. > > https://jira.slac.stanford.edu/browse/HPSJAVA-312 > > So I was planning to just add a single table with... > > current - the beam current in amps > > field - measured field value in tesla or kG > > scale - scaling factor of field map for the run > > But I'm not sure where this information all comes from... > > current - Will this be in the data stream for the upcoming runs? Or should we access it through the MYA command line tool? (Obviously prefer into the data stream.) > > field - Field value at the IP or some other position? When is this measured? How do we get it automatically? Or do we just input this manually? > > scale - I don't know how we get this number. Is it derived from the current? If it is derived should we even store it separately or just compute on the fly? > > I can add the API regardless of whether we know how to get the information, but we should discuss how to access/load this information up front. > > Thanks. > > --Jeremy > > -----Original Message----- > From: Nathan Baltzell [mailto:[log in to unmask]] > Sent: Monday, February 02, 2015 4:33 PM > To: McCormick, Jeremy I. > Subject: Re: Bfield conditions > > Chicane setting relative to nominal is in data catalog, done manually from the spreadsheet this time. We also have magnet currents in epics. > > This will be something that will be in the jlab mysql run db next time (in progress ...). > > > > On Feb 2, 2015, at 7:23 PM, "McCormick, Jeremy I." <[log in to unmask]> wrote: > >> I might have missed this someplace.... >> >> Do we have any B-field conditions for the runs? >> >> Like current, scaling, etc. > > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the HPS-SOFTWARE list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1