1. 1 Liquid Hydrogen update CM33 S Watson P Warburton M Courthold

2. Recap from last CM Hardware nearly completed Vacuum testing imminent Hydrogen testing due to be complete by May 15 th … 2

3. Hardware 3 All complete Remaining pipework Blast panel Vacuum poisoning system Hydrogen bottle regulator Snagging BPG items

4. Commissioning - vacuum 4 Excellent vacuum prior to final line installation Subsequent poor vacuum (10 -4 mbar) Leaks identified in cryostat relief circuit (relief valve, burst disk, pneumatic valve and check valve) Leak arresting check valve installed Vacuum now stable at 2 x 10 -6

5. Commissioning - helium 5 Helium purge success, takes approx 30 minutes Helium fill sequence Cooldown was good, 3 days Liquefaction is slow, 1.5l/day Interrupted by power failure, no liquid lost Helium empty sequence success, takes 1 day

6. Commissioning – H/C 6 Ambiguity with heater-chiller In storage for 6 years 10l glycol coolant assumed enough No specs exist for hydride bed cooling circuit Eventually discover that system capacity is ~100l! 21 day lead time contributed to schedule slippage

7. Commissioning – H/C 7 Working now, with help from manufacturer System has a cooldown delay of approx 1 hour (representative of volume of coolant) Below 0ºC, an offset appears...possibly due to ice build-up on sensor

8. R&D progress 8 Review actions addressed Operational instructions published Manning arrangements finalised Training plan Elements required to commence R&D:

9. Working group 9 Working group formed, chaired by David Findlay of ISIS Includes LH2 experts from ISIS Advises directors of PPD and ISIS Sign-off hopefully taking place on Friday

10. R&D plan 10 Hydride bed charge + purge – 1 week Hydrogen fill – 2 weeks Hydrogen empty + purge – 1 week Helium vac poison test – 1 week

11. Post R&D 11 Immediate decommissioning of cryostat Tender and manufacture of transfer and vacuum lines for AFC Begin negotiations for manufacture of systems B & C Rebuild LH2 team

12. End 12