Small cryotrap – control rack

Nov 2013

Piano temporale

• Mid Jan: RR • Begin Feb: order of the cryostat• May: cryostat on site, rack ready

Small trap

P2

Ge4 Ge3 Ge1

Ge1IB

P1

G22

V22

V23

V1

VPRcryo VIBcryo

Ge1PR

T1

T2

T3T4T5

T6 T7

T8

Ge2

LEVEL

BAKING SYSTEM

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

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)

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