K. Long, 19 April 2023

Beam-line status

— red sky at night?

Upstream beam line:• Upstream beam line:

– Steel shielding removed– Q1—3, D2 re-instated– Soak test performed

Decay solenoid:

Decay Solenoid Extended Powering Test

• Magnet Powered at 870A (=5T) for over 48 hrs between 17/08/09 and 19/08/09.

• Cryostat Helium Level, Shield and Cold Mass Temperatures all stable.

Additional Tests

• Flow rate in current leads was reduced from nominal 25L/min to 18L/min without causing a quench

• Cryostat heater was switched on and off and power setting was varied. Although this caused instabilities in the cryogenic system the fridge was able to recover and the magnet did not quench.

Magnet Current (A)

Cryostat He Level (%) Magnet Temperatures (K)Current Lead Cooling Flow Rate [Blue] (L/min)

M.Courthold, M.Hills

Decay solenoid:

Acceptance Criteria

The solenoid can be ‘signed-off’ for normal running when the following have been achieved.

1. Magnet tested at full current for an extended period (i.e. 48hrs)

2. All vacuum leaks at an acceptable level

3. Fridge operating in a sufficiently autonomous way that cool-downs can be completed without ‘expert’ intervention

4. Quench detector PSU and battery back-up replaced

5. Documentation for (basic) maintenance and operation by non-experts complete

‘In hand’:CMacW assistingsold team to finalise QD

While some documentation exists, thorough job to generate consistent set yet to becompleted

M.Courthold, M.Hills

Presented to and agreed by MICE Technical Board

Downstream beam line & Step I instrumentation:• D2, Q4—Q9:

– Water and power re-established

• Pressure reducing valves fitted

– Need to be calibrated• Magnets have been ‘dry’

for weeks• Soak test OK

• Beam stop– Works OK

• Step I instrumentation:(installation)– Inside DSA complete:

• GVA1, BM1, TOF0, Ckov– Outside DSA:

• BM2, TOF1 in position• KL to be positioned

• D1 tested for 2h10min at 245 A and for 30min at 400 A• Q1-2-3 tested at 195 A for 3h• Q4-5-6-7-8-9 tested at 395 A for 6h• D2 tested at 150A for 5h40m and at 120A for 30m• DKsol tested at 60A for >3h• temp. taken at different intervals showed stability• Some MPS+MAGNET waterflow failures resulting in trips:

however no evidence of water flow problems was found• CONCLUSIONS

– Confident the line is fine– shame no time to test D1 at 400A for longer period– DKsol tested separately at 870A– Important to sort out the fake waterflow issues

Q1-2-3 D1 DKsol D2 Q4-5-6-7-8-9 Soak Test - August 26th 2009(MA, A.Dobbs, M.Ellis, K.Long)

BREAKDOWN of Q1-2-3 D1 DKsol D2 Q4-5-6-7-8-9 Soak Test - August 26th 2009

In the morning (10:00 to 13:20) only DS BL was up. US BL was not powerabledue to hardware intervention (soldering, M. Hughes)

DS BL morning settings: D2=195AQ4-5-6-7-8-9=395 A

At 13:30 D2 was set off to reduce overall power and allow US beamline to be testedQ1-2-3 = 195 AD1=245 A value chosen to not overcame an alleged software thresholdDKsol=60AD2= 0AQ4-5-6-7-8-9=395A

We experienced some MPS and MAGNET waterflow failures which triggered interlocks. In all cases this did NOT seem to correspond to real failures rather some mis-reading from the unit. This should be understood or we can risk abrupt stops when running in Sept/OctD1 tripped @ 13:40 set back to 245A14:20: D2 set to 150 AD2,Q4,Q6 tripped @ 15:20 set back to previous values

15:40 Q1 Q2 Q3 D1 DK D2 Q4 Q5 Q6 Q7 Q8 Q9195 195 195 245 60 150 395 395 395 395 395 395 16:00 set D1 to higher value (no software threshold preventing it !)195 195 195 400 60 120 200 280 200 200 280 350 the final configuration (30 min test)

Temperature readings taken at different times after several hours showed a good stability

CONCLUSION: we believe magnets are well behaving.We tested the line with all magnets at values close to their maximum. We could not power them all MAX simultaneously so We still need to understand the MPS/MGNET waterflow failures generating interlocks which do not seem to correspond to REAL events

TargetJust pictures, details from C.Booth

Target build:• Shaft received from TechVac (DLC coating

company) Wednesday 19Aug09• Assembly of ‘Target 1’ (T1) complete Friday

21Aug09– Installation in R78 completed Saturday 22Aug09– 50k actuations completed Sunday 23Aug09– Metrology of target tip position within dummy

vacuum vessel Monday 24Aug09– Installation in ISIS complete Tuesday 25Aug09

• Gate valve opened ~16:30 – Target space is under the ISIS machine vacuum!

• Assembly of T2 complete Sunday 23Aug09– Installation in R78 complete Tuesday 25Aug09

Modifications in synchrotron vault:• Modified gate

valve fitted– Including

thermocouple• ‘Collection pot’

and mirror system fitted

• Connections reversed for quick installation and removal

T1 build:

T1 installed on ISIS:

T2 build and installation in R78:

• Great team effort!– Great support from ISIS

personnel

• Outstanding issues:– See C.Booth talk, but headlines:

• Details of controls and EPICS interfaces in MLCR installation being sorted out

• Debugging non-standard actuation behaviour in R78 set up

• Still to perform 400k actuation run in R78

Conclusions:• Magnets that make up MICE Muon Mean ready for operation• Target installed and being debugged• Offline target installed and in commissioning phase:

– Debugging non-standard actuations

• ‘Rehearsal’ of running full beam line scheduled for Thursday 03Sep09• For next MICE running phase:

– MMB expert on call 24/7:• Expert to be present to assist MOM and shift crew in setting up beam line for data

taking and to shutdown beam line at the end of data taking:– Essential: e.g. one target interlock not yet established

• Rota to be established:– MMB expert phone obtained– MOM/shift should call MMB expert first

– Goal of all this to be more efficient in set-up, operation, and shutdown than last year

• And finally:– MICE shutdown briefing:

• 12:00, 04Sep09, MICE Hall