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Working group report

Working group report. T500 and E203 Armin Reichold. Wish list for FACET for user run ( E203 ). Reliable and calibrated beam data (BPM TMIT’s vary among themselves and from toroids )

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Working group report

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  1. Working group report T500 and E203 Armin Reichold A Reichold, for SP group, FACET User Meeting, SLAC

  2. Wish list for FACET for user run (E203) • Reliable and calibrated beam data (BPM TMIT’s vary among themselves and from toroids) • Clear written instructions which instruments give reliable data, how to access them and what their calibration is or how it can be found • Layout of facet with actual survey positions of instrumentation and experimental apparatus • Toroid data should be available in EPICS and EPICS archive • Access to EPICS archive from outside SLAC (so far only via facet-srv01) • Users should not write their own beam data logging system. This should be central EPIC archive. Need help with this. Probably in form of software and hardware. • Access routines to EPICS archives from user code (not just from interactive tool such as FACET home) to be provided by SLAC A Reichold, for SP group, FACET User Meeting, SLAC

  3. Wish list for FACET for user run (E203) • EPICS tutorials and examples • Beam profiles in LI20 to be taken under user control and archived • If “SLAC” want to use E203 in our absence we need a new grating and filter control system with digital controls (all analogue & manual now). Do we need to mover our DAQ-control from matlab to EPICS. Need to collaborate on this. • Beams at E203 circular or elliptical with dy>dx and a method for measuring/extrapolating the beam cross-section at our location from wire scans • Alternative method for measuring grating approach to beam. Now we monitor backgrounds and “inch” forward until “it hurts”. Maybe could use pick-ups on gratings? Need advice and collaboration. • IR background reduction using coated beam pipes • Moving DAQ below the table (needs tray fixed to bottom of table, cable could not reach floor level) A Reichold, for SP group, FACET User Meeting, SLAC

  4. Joint list T500 – E203 • Both experiments will define common bunch length variable by using time in which 1-sigma and 90% charge is contained • T500 will use temporal reconstruction based on same phase reconstruction algorithm • DAQ and data storage • Initially aim to write both of our data into EPCIS or other common platform in offline mode but have no idea yet how to do this. • Need to be able to do Beam Synchronous Acquisition (BSA) • First step: time server to synchronise better than 10Hz • Real BSA • Clarify the relation between beam pulse ID in EPICS and SCP • Both experiments would like to have burst mode (single bunch) • Humidity, temperature and pressure measurements on T500 and E203 experiments • Preparation for dry air volumes around experiments to reduce absorption. Dry air supply, “tent or box” A Reichold, for SP group, FACET User Meeting, SLAC

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