Undulator%20Tuning%20Status%20Heinz-Dieter%20Nuhn,%20SLAC%20/%20LCLS%20for%20Zack%20Wolf,%20Yurii%20Levashov,%20Achim%20Weidemann,%20Seva%20Kaplounenko,%20Scott%20Jansson,%20Ralph%20Colon,%20Dave%20Jensen%20January%2023,%202008

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Undulator Tuning StatusHeinz-Dieter Nuhn, SLAC /
LCLS for Zack Wolf, Yurii Levashov,Achim
Weidemann, Seva Kaplounenko,Scott Jansson, Ralph
Colon, Dave Jensen January 23, 2008

• Tuning Results
• Schedule
• Temperature Regulated Storage

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Tuning Results

• Parameters controlled by tuning process include
• Keff
• First and Second Field Integrals
• Overall phase error
• Phase error vs. z.
• Phase Shake
• Tuning affects x range of 2 mm.
• Measurement and documentation includes x range of
  6 mm.
• All results are within tolerance.
• The following slides show a few examples.

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Keff well within Tolerance
4
Phase Difference well within Tolerance
Calculated for E 13.6 GeV
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On-Axis Field Integrals within Tolerance
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Progress Since Last FAC
Progress We have 20 undulators tuned and
fiducialized. The MMF temperature control is
working well. The reference undulator
measurements repeat within spec. We improved
rough tuning procedure to speed-up
throughput. (a) Use capacitive sensors to
monitor gap adjustments (b) Use new gap shimming
stand Bad bolts are being replaced Dimensions of
tapered shims are measured to compensate for
machining accuracy.
Challenges Now we need to set K to a specified
value. Cant re-assign slot number. Overall
throughput is affected by re-checking of stored
undulators. We need a couple of days to maintain
the Kugler bench. New air compressor still not
installed.
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Tuning Status as of 1/22/2008

• SN01 _at_ANL
• SN02 Tuning and Fiducialization Complete. 01
• SN03 Tuning and Fiducialization Complete. 25
• SN04 On hold
• SN05
• SN06 On hold
• SN07 Tuning and Fiducialization Complete. 19
• SN08
• SN09 Tuning and Fiducialization Complete. 07
• SN10 Rough Tuned.
• SN11 Tuning and Fiducialization Complete. 03
• SN12 Tuning and Fiducialization Complete. 21
• SN13 Tuning and Fiducialization Complete. 04
• SN14 Tuning and Fiducialization Complete. 09
• SN15 Tuning and Fiducialization Complete. 32
• SN16
• SN17 Tuning and Fiducialization Complete. 02
• SN18
• SN19 Tuning and Fiducialization Complete. 05

• SN21 Tuning and Fiducialization Complete. 26
• SN22 Rough Tuned.
• SN23 On hold
• SN24 Tuning and Fiducialization Complete. 13
• SN25 Tuning and Fiducialization Complete. 10
• SN26 In Rough Tuning
• SN27
• SN28
• SN29
• SN30
• SN31
• SN32 Tuning and Fiducialization Complete. 30
• SN33 Tuning and Fiducialization Complete. 20
• SN34
• SN35 Tuning and Fiducialization Complete. 08
• SN36 On hold
• SN37 Tuning and Fiducialization Complete. 18
• SN38
• SN39 Tuning and Fiducialization Complete. 23

ref
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Tuning Status Summary
Present Status 20 undulators tuned and
fiducialized 0 in fine tuning 3 in rough tuning 4
deferred for major re-work (bad end magnets,
large sag might hit beam pipe, low field, pole
sticking into gap) (minor problems like bad
bolts or requiring gap shim replacement are fixed
as we go)
Processing started for 27 undulator
segments From these 20 completed
03 in Rough Tuning RSN10,
RSN22, RSN26 04 in
Holding TSN04, FSN06, RSN23, RSN36 MM
03/07 04/07 05/07 06/07 07/07 08/07 09/07 10/07
11/07 12/07 01/08 2 2 2 1
3 2 2 2 1 2 1 AC
2 4 6 7 10 12 14 16 17
19 20
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Tuning Schedule (Ruland)

• tuning throughput is close to three segments per
  month on average without hardware problems,
• Re-fiducialization is a four day process
• Trying to integrate re-fiducialization with
  standardization to optimize CMM usage

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Tuning Schedule Detail (Ruland)

• Rough tuning takes on average three days longer
  than fine tuning we will try to use the
  accumulated gap after every other segment for
  re-fiducialization ? 7 segments, this leaves 13
  to be done after tuning is complete

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Consequences of Low-Temperature Storage

• Tuned undulators have been stored in Bldg 750.
• Undulator Temperature dropped to 11 C since
  early November 2007.
• Three undulators SN20, SN37, SN39 have been
  returned to MMF and measured on Kugler bench.
• Result
• Average gap height decreased by up to 1 µm.
• Magnetic and mechanical changes similar in all
  three magnets.
• Field change can be compensated by moving
  magnetic axis in x direction by about 200 µm.
• At new x location, all tuning parameters are
  within tolerance.
• Plan
• (1) Store all newly tuned and/or re-fiducialized
  undulators in temperature stabilized clean room
  in Bldg 33 (capacity about 10) until Undulator
  Tunnel is ready.
• (2) Move and store tuned undulators on north side
  of Undulator Tunnel after beneficial occupancy
  and AC commissioning.
• (3) Re-fiducialize the other 16 undulators that
  are presently stored in Bldg 750 as storage
  capacity allows.
• Temperature regulated storage is also required
  for the girders after alignment.

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SN20 Temperature History
Acceptable Range
Temperature
Humidity
Minimum 12.5 C
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CMM Measured Change in Gap Height for SN20
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SN37 Temperature History
Humidity
Acceptable Range
Temperature
Minimum 11 C
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CMM Measured Change in Gap Height for SN37
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SN39 Temperature History
Humidity
Acceptable Range
Temperature
Minimum 11 C
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CMM Measured Change in Gap Height for SN39
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Comparison of CMM Measured Change in Gap Height
SN20
SN37
SN39
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New storage location Bldg 33.
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Undulator To-Do List

• When we are done with production
• fix undulators with severe problems
• study temperature dependence of K
• re-measure all previously tuned undulators
• study further undulator handling requirements

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Conclusion

• Production undulator tuning is underway.
• The lab and equipment are performing well.
• (But we need the new air compressor installed,
  borrowed time.)
• 20 undulators are tuned and fiducialized.
• Improved rough tuning procedure speeds-up
  throughput
• Reference undulator measurements are within spec.
• Reference magnet measurements are stable.
• We are checking that the way the undulator is
  mounted
• will not change the fiducialization, and
  twist can be
• compensated by a pitch adjustment.
• After production, we will fix undulators and
  continue studies
• Undulators stored in Bldg 750 changed location of
  magnetic axis.
• Tuned undulators and girders will be stored in
  temperature controlled areas from now on.

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End of Presentation