1. Small cryotrap – control rack Nov 2013

2. Piano temporale Mid Jan: RR Begin Feb:order of the cryostat May:cryostat on site, rack ready

3. Small trap P2 Ge4 Ge3 Ge1 Ge1IB P1 G22 V22 V23 V1 VPRcryo VIBcryo Ge1PR T1 T2 T3 T4 T5 T6 T7 T8 Ge2 LEVEL BAKING SYSTEM

4. Control system functions 1/2 Interlock valves: forbid opening if the pressure is higher than a selectable threshold (1 mbar) and automatic closing (conditions on vacuum, inner P, temperature, compressed air lack). HW wired (maxigauge, temp driver, pressostat) a table will be prepared

5. Functions 2/2 Integrate the racks among the others ones of LAL= communicate with other PLCs for future auto actions Readout statuses (temperatures, pressure, level, vacuum, valves) and send them to DAQ Possibility to operate the two vacuum valves in local mode Display in local mode the temperature, valve status and LN2 level SW supervisor, integrated in the general one. Display status, possibility to close the 2 vacuum valves by remote. No automatic actions/loops required for the supervisor. Heating jacket: thermoregulator could be read by remote and in case stopped: included in the control system? Racks env. noise: 24V power supply thoroidal type, normally no fans Procure a driver for the PT100 with alarm Implement the last version of the Virgo+ refill automatic procedure (2 auto valves + transfer line to external tank?) per accelerare la rigenerazione utilizzare un riscaldatore interno al 'dewar Consider a KEY in the loacl panel, to enable valves (opening authorized)

6. https://workarea.ego-gw.it/ego2/virgo/advanced-virgo/vac/small-cryotrap/ NOTES: 1) A local display would be very useful for the operator during refills, could be connected with a cable to the rack, installed about 10m far from the cryotrap 2) Some components to purchase: PLC (Giulio/Martin), Temperature sensors (Antonio), cabinets +relays + cablings (Roberto/Beatrice), Maxigauge + sensors (Luca), Level meter (American Magnets, Antonio/Luca), Baking system (Roberto/Beatrice/Antonio), Temperature readout with alarms (Roberto/Beatrice) Riscaldatore interno al tank LN2 (Roberto/Beatrice/Antonio … 3) Documents related to Small Cryotraps