Target meeting: 17Jun09, 10:30
Venue: Conference Room 8, Atlas Centre, RAL
Present: Y.Torun, J.Tarrant, P.Hodgson, A.Alecou, D.Adams,
D.Wright, A.Dobbs, P.Smith, J.Pasternak, M.Krendler, A.Stevens, J.Treadgold,
D.Findlay, P.Wright, J.Leaver, K.Long, C.Booth, R.Nicholson, A.Nichols,
C.MacWaters, E.McCarron
Notes:
Notes will take the form of list of actions and agreed items.
1. Mechanical design and status of manufacture: Jason Tarrant
- Two completed assemblies are expected to be ready according to the
present schedule by 20Aug09;
- Shaft grinding now the critical issue. One-piece shafts are
with grinder. Expect to have first production batch at the end of
next week (26Jun09).
- Schedule remains tight with pretty much no slack.
- Commissioning and testing plans are discussed in 5 below.
2. Target radio-nuclide 'budget': Paul Hodgson
- General level of activation predicted by FLUKA not felt to beyond that
which could be handled with carefully planned procedures.
- P.Wright reported that he had obtained the gamma spectrum from the
activated target. It was agreed that the spectrum would be passed to
P.Hodgson so that it could be correlated with the FLUKA simulation.
- Action: PH: Obtain spectrum and cross check with FLUKA
results.
3. Vacuum vessel and associated equipment: Eddie McCarron
- Clean room for target assembly had been identified in R2;
- It was agreed that a collar/clamp arrangement should be designed to
restrain bellows during target installation and removal:
- Action: RN: Propose design for collar/clamp
arrangement for the support of the bellows.
- Agreed:
- Modified gate valve assembly would be installed in the August
shutdown irrespective of whether the target was ready or not.
Needs to be incorporated in installation plan.
- Note to readers: this does not imply that the plan to install
the target in the August shutdown has changed!
4. Electronics, DAQ, control, and interface to ISIS: Paul Smith
- Action: CMacW: Clarify PPS signals to/from target with
J.Alexander.
- Online monitoring of target is required to ensure that target operation
is as has been set by the control system. Various issues discussed, it
was agreed that the following functionality be added:
- Check of achieved versus set dip depth and target trajectory;
- Following a discussion of the interaction of the target with BPS it was
agreed:
- J.Leaver and P.Smith would write a specification for the system that
would generate a MICE target 'good/bad' signal as input to the BPS
system. The staged implementation of the system would also be
addressed in the specification, A logic diagram should be included
in the specification. It may be convenient to include the data
from the linear encoder in the logic that generates the BPS signal.
The BPS system is based on 'dual guard lines', this should be taken into
account in the specification.
- Action: PS, JL: Write specification for generation of
MICE target signal to be included in the ISIS BPS.
5. Commissioning plan and schedule: Paul Hodgson
- Agreed:
- Will run target#1 for 30k pulses, remove it from test rig and
install it in ISIS;
- In parallel to installation of target#1 in ISIS, if possible,
target#2 will be installed in the test rig and run for 300k pulses.
At 300k pulses it will be removed and disassembled to inspect the
bearings. Should no wear be observed, the target will then be
reassembled, reinstalled in the test rig and run to failure with regular
inspections.
6. ISIS trip system and discussion of interlocks: Dean Adams/David Findlay
- Two documents tabled:
- Draft papers on interlock system and interaction of MICE target and ISIS
tabled. In the discussion it was agreed that:
- A 'screen' will be 'served' that can be viewed from the ISIS control
room and that will contain:
- Status information (position of target, requested and delivered
dip depth, target trajectory, etc., good bad BPS signal);
- Beam loss observed in sectors 7, 8, and sum with a comparison to
target dip trajectory;
- Particle rate data to allow optimisation of ISIS beam settings;
- In addition, signals will be sent from MICE to ISIS containing:
- Status of jacking frame: fully up and fully down. Absence
of both signals implies frame position is undefined;
- Analogue position of target;
- Actuate trigger
- The 'good/bad' signal to the BPS may be sent on a cable from the
MLCR to the ISIS MCR or the signal may be sent elsewhere for inclusion
in the BPS.
- Actions:
- JL: Implement status screen as part of control and
monitoring programme;
- PS: Provide signals required by ISIS as described in
item 6 of the notes on the target meeting on 17Jun09;
- CMacW: Transmit the various signals to the ISIS MCR or
BPS system
7. AoB
- P.Wright requested a revised risk assessment and method statement for
the target installation and removal. AN agreed to re-draft the
existing documents.
- AN: Redraft risk assessment and method statements for
installation and removal of target in ISIS.
- P.Wright also asked whether MICE wished to plan to remove and inspect
target. This could be done on the 'inside' of the synchrotron using an
existing frame. There are no such plans at present, but, the target
team will consider whether such an inspection should be carried out.
Will pick up this point at the proposed follow-up meeting to be held in
October or November.
Summary of actions:
- PH: Obtain spectrum and cross check with FLUKA results.
- RN: Propose design for collar/clamp arrangement for the
support of the bellows.
- CMacW: Clarify PPS signals to/from target with
J.Alexander.
- PS, JL: Include check of achieved versus set dip depth and
target trajectory in control programme.
- PS, JL: Write specification for generation of MICE target
signal to be included in the ISIS BPS.
- JL: Implement status screen as part of control and
monitoring programme;
- PS: Provide signals required by ISIS as described in item
6 of the notes on the target meeting on 17Jun09;
- CMacW: Transmit the various signals to the ISIS MCR or BPS
system.
- AN: Redraft risk assessment and method statements for
installation and removal of target in ISIS.