Progress Report on LQ Program Giorgio Ambrosio Fermilab

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Progress Report on LQ Program Giorgio
AmbrosioFermilab
LARP Collaboration Meeting 13 Port
Jefferson Nov. 4-6, 2009
Task Leaders Fred Nobrega (FNAL) Coils Jesse
Schmalzle (BNL) Coils Paolo Ferracin (LBNL)
Structure Helene Felice (LBNL) Instrumentation
and QP Guram Chlachidize (FNAL) Test prep. and
test
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2005 ? The birth of the LQ
We need a successful Long Quadrupole by the end
of 2009!
Some years ago just before CM 4
April 2, 2005


G. Ambrosio - Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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Long Quadrupole

• Main Features
• Aperture 90 mm
• magnet length 3.7 m
• Target
• Gradient 200 T/m
• Goal
• Demonstrate Nb3Sn magnet scale up
• Long shell-type coils
• Long shell-based structure (bladder keys)
• 1st Long Quad test by the end of 2009
• 2nd Long Quad test in Spring 2010

LQ Design Report available online
at https//plone4.fnal.gov/P1/USLARP/MagnetRD/lon
gquad/LQ_DR.pdf
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LQ in LARP RD
S Shell-based support structure
C Collar-based support structure
G. Ambrosio - Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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From TQS LRS to LQS

• LQS is based on TQS
• and LRS

• TQS Modifications
• Added masters
• Added tie-rods for yoke pad laminations
• Added alignment features for the structure
• Rods closer to coils
• Rods made of SS

• Segmented shell (4)

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LQS with dummy Al coils

• LQSD
• LQS assembled with Al coils (LBNL)
• Shipped, lifted, tilted (LBNL FNAL)
• Tested at liquid nitrogen (FNAL)

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LQ Coil Design Fabrication

• Coil design
• LQ coils long TQ02 coils with gaps to
  accommodate different CTE during HT

• Fabrication technology
• From 2-in-1 (TQ coils) to single coil fixtures
  (LQ)
• Mica during heat treatment
• Bridge between lead-end saddle and pole

Cross-section of TQ/LQ coil
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LQ Coils Handling Shipment

• New tooling for long coil handling and shipment
• Handling strain lt 0.05
• Shipment on rigid mandrel in shipping fixture w
  shock absorbers (BNL)

Shipping fixture with shock absorbers
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Quench Protection
Very challenging! J in copper 2900 A/mm2 at
13.9 kA (4.3 K SSL)

• Goal
• MIITs lt 7.5 ?? Temp 380 K (adiabatic
  approx)
• Quench protection param. (4.5 K) conservative
  hypothesis
• Dump resistance 60 mW (extract 1/3 of the
  energy Vleads 800 V)
• 100 heater coverage (? heaters also on the
  inner layer)
• Detection time 5 ms based on TQs with I gt 80
  ssl
• Heater delay time 12 ms based on TQs with I gt
  80 ssl

• Long Quadrupole Overview G. Ambrosio

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• LARP Collab. Mtg 10 Port Jefferson, Apr.
  23-25, 2008

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Instrumentation

• Voltage taps 13 IL 7 OL
• Two protection heaters on each layer
• Large ss strip with narrow heating areas
• Successfully tested on Long Racetrack
• Bubbles may cause coil-heater shorts
• ? test at 4.5, and 3.0 K (1.9K at the end)
• Coil strain gauges 4 IL
• Gauges instrumented with wires
• Structure strain gauges
• Shell 10 (two full bridges each)
• Rods 4 (two half bridges each)

Test at LN of Protection Heaters
G. Ambrosio - Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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Status Summary

• 5 production coils are ready
• Wind cure (FNAL)
• React. Impr. (BNL FNAL)
• Instrumentation (all 3 labs)
• Shipping fixtures (BNL)
• Shell-structure was tested LQSD
• LQS01 was assembled (LBNL)
• ? LQS01 ready for test (FNAL)

G. Ambrosio - Long Quadrupole
DOE Review 09 - FNAL, July 13-14, 2009
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LQS01 Assembly

• LQS01 assembled and pre-loaded
• Strain gauge readings
• on the structure (shell rods) are on target
• on the coils are lower than expected with large
  scattering
• Seen also in TQS models partially caused by
  coil/pads sub-assembly
• ? Should improve at cold

Comparison of measurements and targets
G. Ambrosio - Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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Test Preparation
J in copper 2900 A/mm2 at 13.9 kA (4.3 K SSL)

• Quench Detection System with Adaptive Thresholds
• To allow using low threshold at high current
  avoiding trips due to voltage spikes at low
  current
• Both DQD and AQD
• Symmetric Coil Grounding
• To reduce peak coil-ground voltage
• LQ needs larger dump resistance than TQ magnets
  (60 vs 30 mOhm)
• Reconfiguration of the Magnet Protection System
• Additional Heater-Firing-Units for all LQ heaters
  (16)
• Modified Strain Gauge Readout System
• To reduce noise and sampling time

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LQS01 Status

• LQS01 is connected to the VMTF top-head
• Electrical check-out is in progress
• Cool down start this weekend or early next week

LARP CM13 BNL Nov. 4-6, 2009
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Test GOALS

• Achieve target gradient 200 T/m
• Compare with TQ02-series
• Understand training
• Compare with TQ02-series
• Understand if limitation is due to mechanics
  and/or coils
• Understand if changing one coil could improve
  significantly performance ? for next test
• Memory after thermal cycle
• Understand behavior at 1.9K
• Inner Layer bubbles could cause coil-heater
  shorts!
• Could reduce the number of usable protection
  heaters

G. Ambrosio - Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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Present LQ FY10 plan

• Notes
• Coils 14 15 start after LQS01 feedback
• Coil 13 may have delays because of conflict with
  HQ coils fabrication
• Plan for success with budget 1.4 M
• Need contingency money in case of problems

G. Ambrosio - Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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LQS01 Test Scenarios

• Successful (G gt 200 T/m)
• Limited (G lt 200 T/m) by one or two coils
• There is a flaw in all LQ coils
• design and/or fabrication technology
• All coils are damaged during cooldown or test
• mechanics or quench protection failure, excessive
  pre-load,

• ? LQS02 (4 new coils) or LQS01b (1 or 2 new
  coils)
• ? LQS01b (1 or 2 new coils), may need 3rd test

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G. Ambrosio Long Quadrupole
LARP CM13 BNL Nov. 4-6, 2009
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Conclusions

• The test of the first Nb3Sn Long Quadrupole
  (LQS01) is starting
• We planned the test in order to obtain as much
  information as possible
• The present LQ FY10 plan is based on success
• May need to use contingency in case of limited
  performance

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Addendum
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LQS01 Test Plan - I

• Room temperature preparation and cool down (10
  days)
• Magnetic measurements (z-scan) at VMTF
• 1st Thermal Cycle (10 days)
• Test at 4.5 K
• Cold electrical checkout
• Magnetic measurements
• Quench training
• Ramp rate study
• Cool down to 3 K
• Quench Training
• Magnetic measurements
• Ramp rate study
• Temperature dependence study
• Warm up to 4.5 K
• Verify quench plateau at 4.5 K

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LQS01 Test Plan - II

• Warm up to 300 K before 2nd thermal cycle (4
  days)
• RRR measurements
• Cool down (4 days)
• 2nd Cold Test (10 days)
• Test at 4.5 K
• Quench training ? Memory
• Cool down to 1.9 K
• Verify operation of protection heaters
• To avoid possible damage after first few quenches
  we will do hi-pot (coil-heaters) and low current
  trips to verify proper operation of heaters
• Quench Training
• Magnetic measurements
• Ramp rate study
• Temperature dependence study

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LQS01 Test Plan - III

• Warm up to 4.5 K
• Verify quench plateau
• Protection heater study
• Spot heater study
• Warm up to room temperature (6 days)
• Magnetic measurements (z-scan, use warm-finger of
  full length)

LARP CM13 BNL Nov. 4-6, 2009
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1.9K Test

• Bubbles are a possible cause for coil-heater
  shorts
• Electric arc?
• Note we never had heaters on inner layer

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Original Present plans
2N 1R
No 3rd generation
In FY08
In FY07-08, No ceramic binder

• We had delays, some parts were skipped, but we
  want to keep the 2009 LQ goal
• ? it can be done, but no without pain!

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Long Nb3Sn Coils RD

• LARP Long Racetrack (4m coils)
• 1st LR 90 of ssl w single shell
• 2nd LR 96 of ssl w segmented shell
• Coils flat, no wedges, no tight constrain on
  coil cross-section during heat treatment

• FNAL Long Mirror (2-4m coil)
• 1st LM (2m coil) ssl w PIT strands
• 2nd LM (4m coil) 87 w RRP 108/127 str.
• Coils cos-q, with wedges, and tight constrain on
  coil cross-section during heat treatment

Using heaters on outer layer
Front view of mirror magnet