ISTITUTO NAZIONALE DI FISICA NUCLEARESEZIONE DI MILANO

LABORATORIO ACCELERATORI E SUPERCONDUTTIVITA’ APPLICATA

Magnet Test Station@ LASA, INFN-Milano

Giovanni Volpini, CERN 12 March 2015

MAGIX & INFN participation to HL-LHC

MAGIX

WP1 CORRAL

Design, construction and test of

the five prototyes of the

corrector magnets for the HL

interaction regions of HiLUMI

WP2PADS

 

2D & 3D engineering design of

the D2 magnets

WP3 SCOW-2G

Development of HTS coil for

application to detectors and

accelerators

WP4 SAFFO

Low-loss SC development for

application to AC magnets

MAGIX is a INFN-funded research project, (GrV, «Call») whose goal is to develop superconducting technologies

for application to future accelerator magnets.

It includes four WP’s, two of which are relevant to HL-LHC

2014-2017, 1 M€ + personnel funds

CERN-INFN Collaboration Agreement

INFN already involved in FP7-HiLumi (UE-HILUMI, GrV)

WP2 beam dynamics, LNF WP3 magnets, MI-LASA

WP6 cold powering, MI-LASA

1

2

Approved by the INFN Board of Directors & signed by INFN President on June

2014; signed by CERN DG on July 17th.CERN endorses MAGIX WP1 & WP2

deliverables and milestones, contributing with 527 k€

Giovanni VolpiniCERN 12 march 2015

Corrector magnet

inventory

From 6-pole to 12-pole magnets exist in both

normal and skew form (the latter is shown)

150

OD320

150

OD460

The superferric design was chosen for ease of construction, compact shape, modularity, following the good performance of earlier corrector

prototype magnets developed by Ciemat (Spain).

Mechanical support

Iron yoke

SC CoilsMechanical

support

SC Coils

Mechanical support

Iron yoke

SC Coils

Giovanni VolpiniCERN 12 march 2015

LHC HL-LHC

Order

Type

Aperture

Stored energy

Operatin

g Current

Inductance

Aperture

Mechanical Length

Stored energy

Operating Current

Differential

Inductance @ Iop

mm [J] [A] [mH] [mm] [mm] [kJ] [A] [H]

2 S MQSX 70 2,116 550 14 150 891 24.57 182 1.247

3 N MCSX MCSTX 70 39 100 4.7 150 184 1.28 132 0.118

3 S MCSSX

MCSOX

70 6 50 7.8 150 184 1.28 132 0.118

4 N MCOX 70 16 100 4.4 150 160 1.41 120 0.152

4 S MCOSX 70 22 100 3.2 150 160 1.41 120 0.152

5 N 150 172 1.39 139 0.107

5 S 150 172 1.39 139 0.107

6 N MCTX MCSTX 70 94 80 29.2 150 514 4.35 167 0.229

6 S 150 166 0.92 163 0.052

LHC vs. HL-LHC corrector magnetcomparison chart

187

/II

Rev 9 July 2014

Test Station & Equipment Review

Experimental area

Vertical cryostat

D700 x 6500 mm May host magnet up to

10 ton x 5 m

Giovanni VolpiniCERN 12 march 2015

ID 510

3000

MAGIX Test cryostat

2.5 ton design loadConduction cooled thermal shieldDesign option: ring to fix a λ-plate w/ reduces free bore

ID 460

CL’s 500 A

Sub-cooled LHe operation

Suitable for smaller magnet (6-pole, 8-pole, 10-pole) test

Small Magnet Test Cryostat

Current sources

Linear Power Converter 220 A x 6 V

Switching Power Converter 500 A x 125 V

Three 10 kA x 6 V switching power convertes . They can be operated in series or in parallel.

Current measured through a 10 kA DCCT.

External bus bars designed for 10 kA

A system to operate the power supply in discharge mode is based on a diode bank which sinks the power, in parallel with Mosfet’s which short-circuit the diode bank during the current ramp-up. This allows for ~ -15 V during the discharge cycle.

1. QDS (MSS Magnet Safety System)Initiates a fast discharge or switches off the power supply incase some voltage thresholds on the magnet or on its electrical connection are exceeded. Includes a capacitor bank for firing quench heaters.

2. Current Control & Slow AcquisitionTwo different functions, implemented in the same hardware & software system. Slow acquisition monitors and records most important data (temperatures, current, voltage along critical items) from the cooldown to the operation. Data are avalilable to the operator and recorded at about 1 Hz.

3. Fast Acquisition Records voltages across the magnet under test with 1 kHz sampling frequence, in coincidence with a fast discharge

4. V*I AC losses measurement systemA dedicated system which measures the AC losses by numerical integration of V*I product, measured by a couple of synchronized VMM.

It is completely independent from other systems, from the voltage taps on. This allows to perform checks, modification on the ground, etc. without affecting other safety-critical systems.

Control & Data Acquisition Architecture

Giovanni VolpiniCERN 12 march 2015

1. Magnet Safety System

16 channels (may be expanded), each:optoinsulated input, bridge/single end independently configurableVoltage thresholds ±4V, ±1.25V, ±500mV, ±100mV Time validation ranges: 0-10 ms, 0-100 ms, 0-1 sInput signal made available in copy Memory of fired channels

2. Slow Acquisition

NI

Com

pact Fie

ld P

oin

t

Giovanni VolpiniCERN 12 march 2015

3. Fast Acquisition

Magnets to Test

MAGIX 2014-2017 INFN committment: 5 prototypes, cold tested, but w/o

magnetic measurements

RT meas + Cold meas

Series Production, 2018-2019

no formal committment exists yet for the manufacture

54 magnets (including spares) 6 quadrupoles 12 sextupoles, normal and skew

12 octupoles, normal and skew12 decapoles, normal and skew 6 dodecapole normal

6 dodecapole skew

TEST sequence

Quadrupole 1 / cold runDodecapole normal 2 / cold runOthers 4 / cold run

Test RequirementsTEST sequence for series magnets.All to be done in the larger cryostat

Quadrupole 1 / cold runDodecapole normal 2 / cold runOthers 4 / cold run

Issues to be clarifiedFree room in the top flangeCryostat internal accessOperation

shaft inserted and removed at warm?cool down requirementsmaximum pressurestray magnetic fieldcabling from the probe to data acquisition systeminterface with exsisting equipements (e.g. Current reading from

power converter)reference (fiducials) on magnets for probe connectionaob ?

The END

Giovanni VolpiniCERN 12 march 2015

Giovanni Volpini CERN 12 March 2015

320

Yoke laminations machined by laser

cutfollowed by EDM (final accuracy

1/100 mm) on the relevant surfaces: poles, coil slots, alignment slots.

5.8 mm thick iron laminations

Design & Assembly

Upper Flange

DC

CT

++

+

CL

3 x

10 k

A /

6V

HP 344116.5 digits DVM

Mag

net

un

der

te

stC

LHP 34411

6.5 digits DVM

Trigger Clock

LabView Software

running on PC

Ext Trigger

GPIB

Net work Q performed by the power supply on the magnet between t0 and t1.

n

j jj

t

tIVtdtIVttQ

101

1

0

),(

4. AC-loss measuring apparatus

experimental area @ LASA

DISCORAP cryostat

vertical cryostat

magnet connection system

cold mass

ground floor

-6.5 m

Free ID 697 mmMax operating pressure 4.5 bar absThermal shield cooled by LN or evaporated GHe

DUTmax lenght 5 mmax weight 10 ton

MAGIX Cryostat