Upload
elfrieda-ryan
View
215
Download
0
Tags:
Embed Size (px)
Citation preview
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