Status of Magnet R

1
Status of Magnet RDNov. 7th 2002James T
VolkFermilab
NLC - The Next Linear Collider Project
11/07/2002

• James T Volk

2
People Involved

• Joe DiMarco, Vladimir Kashikin, James T Volk
• Fermilab
• Scott Anderson, Seung Rhee, Cherrill Spencer,
  James Spencer, Zack Wolf
• SLAC
• Steve Gottschalk
• STI Optronics
• Bellevue Washington

11/07/2002

• James T Volk

3
Electro Quad on SLAC test stand
11/07/2002

• James T Volk

4
Y coordinate of the electromagnetic quads
magnetic center measured over 2.5 days
Current changed in a BBA sequenceblack circles
are Y center at 80 amps, open circles are Y at 5
different currents which quad would be run at for
a BBA 64, 67.2, 70.4, 73.6, 76.8 amps
Run 31, 25th 28th October 2002
Variation in Y during any one BBA sequence to be
lt 1 micron is satisfied.
5
Wedge Quad
Pole magnets
Wedge magnet
Tuning rods
11/07/2002
James T Volk
6
SLAC Rotating Coil Data
11/07/02
James T Volk
7
Rotational Quadrupole with Correction Coil System
Stepping motor
Rotational quadrupole assembly
Correction coils
11/07/2002
Rotational quadrupole assembly (side view)
V.S.Kashikhin
8
Correction coils
Without correction
Rotational quadrupole control system
With active correction
First analog active correction system test in
progress
V.S.Kashikhin
9
Rotational Quadrupole with Correction Coil System
1 ?m center shift 1 G dipole field 1 A
correction coil current
Integrated signal from measuring coil during
magnets rotation
Measuring coil
Amplifier - Integrator
Correction coil
Center shift vs. correction coil current
Power Supply
11/07/2002
Active Correction System
V.S.Kashikhin
10
Counter Rotating quad
microns
11/07/2002
1 um center stability with correction coil
V.S.Kashikhin
11
STI Phase I PM Quad Prototype Results
AN SBIR grant to Steve Gottschalk Of STI
Optronics of Bellevue Washington
An adjustable quad where the magnet material moves
Work Supported by Department of Energy Grant
DE-FG03-01ER83305

• James T Volk

11/07/2002
12
STI Phase I prototype on SLAC bench

• All tests done by moving two magnets out of four

• James T Volk

11/07/2002
13
Results on Phase I prototype

• Strength is linear with brick retraction
• Sextupole is acceptable and doesnt change during
  retraction of 2 bricks

• James T Volk

11/07/2002
14
Centerline adjustment results

• Mechanical advantage 10X
• Linear shift with brick retraction
• Short term centerline repeatability is 0.4
  microns
• Fine tune of brick shift with strength can make X
  CL zero at all retractions

• James T Volk

11/07/2002
15
Long term X centerline results
Spinning coil x CL
Hall probe x CL

• Initial increase of X CL by 6 microns with
  spinning coil due to magnet supports
• Hall probe doesnt show the same effect
• Improve supports for magnet and granite block

• James T Volk

11/07/2002
16
Phase II prototype

• Full size
• Engineered!
• Motorized
• 4 NEMA 17 servo motors
• Ethernet servo controller Galil DMC2142
• Temperature compensated
• Preloaded Ball screws and linear guides
• 4X faster movement than NLC (neglecting eddy
  currents)
• Modular for flexibility
• Servo parts have been ordered
• Magnets, poles will be ordered soon

• James T Volk

11/07/2002
17
Preliminary Phase II Quad Design

• James T Volk

11/07/2002
18
Preliminary Phase II prototype schedule

• Engineering design complete March 2003
• Fabrication complete May 2003
• Testing starts May 2003
• Majority of prototype tests completed Sept 2003
• Spinning coil fabrication completed March 2003
  (STI cost share)

• James T Volk

11/07/2002
19
Halbach Ring Quad
LCRD Grant Proposal by J Rosenzweig To build one
Poles
Magnets
Rotating ring

• James T Volk

11/07/2002
20
Failure Modes and Effects Analysis to Calculate
Life Cycle Cost for NLC Electro and Perm Magnets
WC
Magnet
S
Solid Wire Coils
Water Cooled Coils
SPS
LPS
Power Supply
LPS
2nd Stage Calculate Permanent Magnet Life Cycle
Cost Mostly Using Component Failure Rates
In Progress
3rd Stage Compare 1st and 2nd Stage Results to
Help Determine Magnet Technology for NLC
11/07/2002

• James T Volk

21
Life Cycle Cost (30yr) FMEA for Electromagnet
with Monte Carlo Simulation
()
()
()
()
Monte Carlo Simulation Variables Detection Time,
Fixing Time, Delay Time,
Quantity, Parts Cost
11/07/2002

• James T Volk

22
Estimating Frequency of Water Blockage from
Empirical Data Obtained failure history (CATER
system) for 5 year period (1997-2001)
Expected Downtime (1-Availability) x Operation
hour/year (due to water flow blockages)
(1-0.999007) x 6480 hour/year 6.4
hour/year (if NLC uses all electromagnets)
Occurrence Expected Downtime / MTTR
6.4 / 3.02 2.1 / year
11/07/2002

• James T Volk

23
Estimate for Availability of all Electromagnets
for NLC
Downtime for all types of magnet failures Total
7167 Magnets
Availability
Estimate for Availability of all Power Supplies
for NLC
Total 6167 Power Supplies
Estimating Overall Electromagnet System
Availability for NLC Magnets Power Supplies
(with redundant large PS )
11/07/2002

• James T Volk

24
Predicted Electromagnet Life Cycle Cost for 30
yrs Using Monte Carlo Simulation (5000 runs)
95 of the time the simulation predicts less than
this amount
of correctors 2202 of water cooled magnets
4965
Units Million Dollars
Predicted Power Supply Life Cycle Cost
11/07/2002
of small PS 2785 of large PS 3382
Units Million Dollars

• James T Volk

25
Radiation Damage

• Neodymium Iron Boron is an attractive material
  for use in Permanent magnets

• Lower cost than Samarium Cobalt

• Higher energy density than Samarium Cobalt

• Less brittle easier to work with

• Radiation damage issues

• Not well measured especially for higher
  coercivity materials

• But not as resistant as Samarium Cobalt

• Issues with activation of Boron

Need to test different manufactures and different
coercivities
11/07/2002

• James T Volk

26
Radiation Damage

• Radiation Damage to Permanent Magnets LCRD 2.24
• Lucien Cremaldi Unv. of Mississippi
• James Volk Fermilab
• Expose magnets to gamma rays
• Cs 137 662 KeV gamma 180 rad/hr 0.18 Mrad
• Co 60 1.16 MeV gamma 80 Krad/hr 80 Mrad

11/07/2002

• James T Volk

27
Radiation Damage

• Radiation damage studies of materials and
  electronic devices using hadrons LCRD proposal
  2.9.1
• Dave Pellett and Max Chertok of UC Davis
• James Spencer of SLAC
• James Volk of Fermilab

• Use the McClellan Nuclear Reactor Center (MNRC)
• in Sacramento and UC Davis Crocker Nuclear Lab at
  Davis
• Do both thermal and fast neutrons
• Use small quads that fit into rabbit holes
• Working on getting spectrum for damping rings and
  LINAC

11/07/2002

• James T Volk

28
Radiation Damage
UC Davis MNRC Irradiation Facility
      CIF Central Irradiation Facility PTS Pneuma
tic Transfer System NTD Neutron Transmutation
Doping
11/07/2002

• James T Volk

29
MNRC Rabbit can
11/07/2002

• James T Volk

30
Radiation Damage
Magnet material
2.125
Gap (variable)
Flux return
1.125

• James T Volk

11/07/2002
31
Prototype of Radiation test quad
Al spacers
Magnetic material
Gap for hall probe
Direction of B orange arrow
11/07/2002
32
Radiation Damage
Beam pipe between 2 dipoles
At Ring to LINAC Septum
Calibration 107/sec
ceiling
33
Radiation Damage

• Have 2 grants in to study radiation damage in
  ND-Iron Boron
• Working up designs for magnets to fit available
  space
• Measuring spectrum in damping rings
• Expect to get some data on radiation damage by
  this winter
• Should have good data by Summer
• This will of course lead to more questions,
  experiments, grants,
• Present data at 18th International Conference on
  Magnet Technology in Oct 04?

• James T Volk

11/07/2002
34
Future Plans

• Continue work on understanding and improving
  measurement system
• Work on motorized drives for PM quads
• Work on active correction coils for PM
• Continue reliability studies on EM and PMs
• Radiation damage studies

11/07/2002
35
Summary

• Slow and steady progress on various adjustable
  quads
• Understanding measurement systems and make
  improvements
• Reliability studies continue
• Radiation damage studies beginning should have
  results by next MAC

11/07/2002

• James T Volk