KFA-45: 5 th Generator Assessment of project base - PowerPoint Presentation

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KFA-45: 5th Generator

Assessment of project baseT. Kramer

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Introduction:

Today’s Status of KFA45

Dephasing, magnet entry box and LC filter deployed, tested and hardware commissioned.Flat top and post pulse ripples reduced. Rise time increased. Voltages:1.4GeV:terminated mode: ~78kV (4 modules)SC-mode: ~39kV (4 mod.), ~53kV (3 mod.)

2 GeV beam: ~57kV (~76kV 3 mod.)

BEFORE EYETS

AFTER EYETS

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Foreseen Tasks

If beam based measurements fully confirm the simulation and hardware tests the initial

LIU PS kicker injection 2 GeV upgrade is done.However: Additional activities have been identified and scheduledAnalysis and optimization of permanent SC mode.Removal of TMR + new magnet entry box.Complete suppression of SF6 gas filled TX cables. New LEMO magnet entry box (as for KFA71/9).

Spare PFL.Spare magnet(s).Deployment of 5

th generator

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Fellow request pending (AFC May 16

th

)

General Need for a 5th

Generator

A “5th Generator” is needed for spare magnet(s) conditioning, testing and measurements. Spare PFL cable available, many generator parts available

867 test stand to be build.Note the unique impedance of 26.3 Ohms.

Currently no test possibilities for generator improvements!

(

Despite

the fact that we know that there is a mismatch in the main switch

a

ny tests/measurements can only be done during usually crowded YETS, no major modifications allowed).

Conclusion: “A” 5th Generator is needed.

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Operational need for 5th

Generator (in B365)

1.4 GeV Operation with less then 4 generators was so far declared as degraded mode (by OP).Reserves: So far system could run in switched SC mode with 2 modules only (at 80kV).

2 GeV LIU / permanent SC mode: minimum required no. of modules:

3. dephasing will not work with full performance

increased

module current will lead

to some saturation effects (considered as not too critical as switched SC mode (2 modules only) was also handled by OP in the past).

However:In

case of HV incident (e.g. PFL cable issue) it is risky to operate the rest of the system at higher voltage! (risk present today already) Scenarios: A) Faulty PFL cable: 1 magnet module down. Exchange

of PFL takes ages -> prepare PFL spare to reduce time to 1-2 weeks. Experts needed. Only one spare PFL cable left! B) Any other generator failure that is not easy to find/correct. Experts needed. 1 magnet module down.

In both cases system can partially run on three generators (as far as electrical safety permits any work nearby).

C) 5th

generator deployed in building 365 decreases

almost any generator fault

time to ~

2h (doable for piquet).

A 5

th

generator will have

no effect

on fault times of

tunnel.equipment

(magnet etc.)

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Need for Space

Initial plans for KFA-45 controls renovation required more space

than available. Recently this has been re-evaluated and the available space will now be sufficient (without switched SC mode and the 5

th generator).

867 test cages: Test cage for the spare magnet testing is hard to arrange (big 26.3 Ohm cable drum) but might be possible

.

Consideration in Summer 2016:

If building extension is anyway needed the opportunity shall be taken to accommodate the 5

th

generator (and possibly the complete magnet test stand).

Basis for decision has changed!

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PS Infrastructure

Building Shelter 305 (PSB PFL cables):

better than nothing but needs some attention in the long term future. Building 359 (CT, FAK): Not “oil tight”, FAK area too small. Building

Barack 362 (KFA-28): Bad state, CV needs renovation. System far away (long cables)

Building

365

(KFA-45):

Old, too small

, roof sometimes leaks.

Building 367 (MTE):

OK

Plenty of issues to address, but not within the LIU-PS injection WP

-> separate future CONS project?

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Space - Conclusions

Old Infrastructure needs attention in the future (long term), 365 extension would certainly help but:Optimization to be found

outside LIU-PS inj. WP (e.g. Consolidate 305 and move KFA-28 (shorter cables, empties 362) and DFA systems (shorter cables, empties space for FAK)) Technology evolution will lead to changed space requirements (long term) Still difficult to find SF6 cables. -> develope conventional cables? -> suppression of SF6 systems.

Solid state switches. Inductive adder / MARX

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Resources & Schedule for 5th Generator

PFL and many switch parts already

available.Budget available (inc. (small) building mod.)Low on HR for (CE) development and implementation

(retirements, new structure). ScheduleStill

ok for generator hardware side (building and bulky parts need to be there by end of LS2, final assembly/testing/commissioning could be done later).

Issue for controls renovation,

need to plan functions and infrastructure now and start installation with beginning of LS2.

Conclusion: Very difficult to progress without impact on other projects or schedule.

Limiting factors

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HR Estimates

All in FTE

Engineer

Tech. Engineer

Technician

Draftsmen

Sum

CE+ Infrastructure (+permit

, PE

)

0.2 (+0.3)

0.2

0.2

0.4

5th Gen Spec.

0.1

0.1

0.2

0.4

Controls

Spec

&

Int.*

0.1

0.3

0.2

0.6

Deployment**

0.1

0.2

0.5

0.8

Commissioning

0.2

0.1

0.3

Sum

0.5

0.9

0.5

0.6

2.5

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90% PPE

KSD, MME?

*5

th

Gen. Impact (Interface) - controls renovation in separate WU.

**Controls deployment not considered.

Conclusions & Discussion

There will be an operational redundancy for the KFA-45 system handling 2 GeV beams similar as we have it now.

In case of “one module faulty” the risk increases due to elevated voltages (as it does now). SF6 cables issue needs to be (further) addressed. PFL exchange to be prepared to reduce downtime. It would still be preferred to have an operational 5

th Generator as reserve and for system development.

Current schedule, HR and ABT workload

as well as expected

technology evolvement

suggest however to

only build the 867 test stand

. Controls renovation to be fitted into existing space

. Hence no building extension (infrastructure needs to be addressed in CONS) No deployment of 5

th Generator to B365.BUT:Plan already space for an inductive adder or MARX test generator (362?)

Prepare spare PFL cable and exchange procedure.Prepare “long lead items” (certain generator spare parts).

Revaluate risk level in 2 years.

Questions?

Reactions?

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