R. Rosol, LIU-PSB review, 10 September 2014 1

R. Rosol, LIU-PSB review, 10 September 2014

BI.DIS Pulse generators

2

Luc SERMEUS, Rodolphe ROSOLLaurent DUCIMETIERE

R. Rosol, LIU-PSB review, 10 September 2014

Contents

- BI.DIS system parameters- System and pulse generators description- Present status and Planning until end 2014- Potential issues- Spending profile- Resources- Conclusion

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BI.DIS system parameters

Parameter Unit ValueDeflection angle at 160 MeV(vertical)

mrad DIS0: 3.77DIS1: 4.23DIS2: 3.84DIS3: 3.4DIS4: 3.97

Kick flat-top duration µs DIS0: 20DIS1: 170DIS2: 320DIS3: 470DIS4: 620

Kick rise time (1-99)% µs ≤ 1

Kick flat-top ripple (p-p) % ≤ ±1

Magnet current A ~ 1000 A

PFN impedance Ω 6.25

PFN voltage kV 6.25

Repetition rate Hz 1.1

5.4632 5.5042 5.5452 5.5862 5.6272 5.678

x 104

-80

-60

-40

-20

0

20

40

60

80

Drift Space [mm]

Am

plitu

de [m

m]

PSB Injection Geometry for DIS Magnets for D = 0

6.024

-4.78

-12.1

-20.2

5.4 5.6 5.8 6 6.2 6.4 6.6

x 104

-300

-200

-100

0

100

200

Drift Space [mm]

Am

plitu

de [m

m]

~150µs

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System and pulse generators description

• 5 Pulse Forming Networks 6.25 Ω (one per magnet) + 1 spare• PFN voltage up to 10 kV ( ~ 6.25 kV nominal with H- operation)• IGBT switch (2 × 6.5 kV device in series)• fixed duration (different for each PFN, max 620 µs)• short-circuited magnet• recuperation of a large fraction ( > 50 %) of the PFN stored energy (1270 J)

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System and pulse generators description

BI.DIS generators location in B361 (BCER)

PFN racksControl racks

Control racks

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System and pulse generators description

Each PFN rack contains two separate PFNs of 60 L-C cells maximum

L-C cell

PFN RackSwitch rack

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System and pulse generators description

Each PFN rack half is “hermetic” and has an integrated automatic fire detection and CO2

injection system.Pressure relief valves have to be installed to limit the CO2 pressure in the rack.

Pressure relief valve Front cell

IGBT Switch

Earthing device

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Present Status and Planning until end 2014

STATUS 09/2014• PFN mechanical design completed at 95 % (CATIA 3D models and 2D

fabrication drawings).• One rack and other parts ordered to allow full test of one PFN.• Lab. test on a prototype PFN on-going (validation of components).• Two IGBT types selected among four manufacturers to meet the pulse

required rise time.• Tests with full pulse length (620 ms) and nominal required current

(1000 A) performed but to be repeated for thermal aspect.

NEXT STEPS • Assemble a full PFN generator and start final tests.• Check thermal performance• Test and validate the fire extinguisher system.

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Potential issues

• As the PFN rack has to be “hermetic” to a certain extent, air cooling is not allowed (fire prevention).

The main potential issue might be overheating in the PFN rack due to losses (incomplete recovery of the PFN stored energy). The lost energy is mainly dissipated in the coils.

The maximum design repetition rate of 1.1 Hz might not be guaranteed.

Some modifications to the rack to allow for water cooling might be necessary. Piping work will then also be needed in BCER (overcost).

• The rise time measured with the prototype is just at the limit of the requirements. The PFN impedance and consequently the operating voltage might have to be increased to reduce the time constant Lmagnet/ZPFN of the system.

Year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

PV 63 85 85 166 262 1,209 347

EV 0 33 201 171 130

AC 60 135 82 166 131

New PV 300 800 350 300 24

Metrics per year in kCHF

Description Provide BI.DIS pulse generator

APT wu 92160

Wu responsible l.ducimetiere@cern.ch

Budget code 65734

BI.DIS spending profile

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Resources for 2015/16

1. Material to be ordered and delivered next year (5 PFNs)• Mechanical components (rack, coils, fire detection…)• Electrical components• Measuring devices• Miscellaneous

Total: 900 kCHF

2. FSU • Coils manufacture• PFN and switch assembly

Total: 250 kCHF

3. CERN FTE• Drawings update and orders (mainly via MME subcontracting)• Assembly• Supervision and tests

Total: 3 FTE

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Conclusion

The new BI.DIS generators is now close to enter in their production phase in parallel with the completion of the design and prototype phase.

Big production effort starting mid-2015 (after ELENA).

Technical aspects still to be checked on full size PFN:• Thermal behaviour• Rise time

No budget issue assuming no additional cooling required

The goal of having the full system ready for installation end of 2016 should “almost” be met providing the manpower is made available.

THANK YOU FOR YOUR ATTENTION!

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