# Presentation: 558911

## Configuration Control

- Applies to any complex system, but we will
- concentrate today on Tevatron magnet
- alignment and stability.

## Tevatron Alignment Task Force

- Goals for today’s meeting:
-   Establish subgroups for the 4 main activities.
-   Develop an action plan, so that we can
- 	measure our progress for each subgroup.

## Charge from Roger

**Charge from Roger**

## Charge (Quick Summary of Status)

- 	dipoles, quadrupoles, and other accelerator components
- 	installed in the Tevatron tunnel.  (Roll, elevation, horizontal offset,
- 	and movement of cryostat relative to the yoke. Can be written today.)
- Assess the impact of such misalignments and present plans for
- 	correcting them to the Tevatron Department Head.   (The effect of
- 	a1 component is well understood. The effect of rolls have been
- 	calculated. Elevation misalignment is too large for corrector magnets.
- 	Horizontal offsets were sampled during F0 and C0 construction.)
- Develop plans for improved methods for measuring, monitoring,
- 	and maintaining the Tevatron alignment parameters. (1. Motion
- 	detectors provide information regarding short term movement of
- 	magnets; 2. Rapid survey takes place once a year during extended
- 	maintenance period; 3. Every two years, measure tie rods and
- 	alignment plugs relative to the site wide network.)
- 4.	Data Handling: Important for any of these issues.

**Charge (Quick Summary of Status)**

## Test Stands

- Test Stand at IB1.
- Quad and turn-around
- box mounted.

- Test Stand at MP8. Spool is being installed.

- At IB1, to study stresses and
- other effects due to magnet
- in situ rotation.

- At MP8, to study fixtures, motion
- detectors, and survey techniques
- for Tev magnets. This will be a
- string of 4 dipoles, a quad, and
- a spool.

## Charge (Smart Bolt Adjustments)

- Mike Church:
- Readjusting the smart/dumb bolts will depend on, among other things.
- 	a)  What integrated luminosity do we expect to gain from this operation?
- 	b)  What other shutdown activities have higher priority? (None!)
- 	c)  How much Tevatron retuning will be necessary after this operation?
- 	d) What is the risk of breaking a magnet and having to replace it? (Must be careful!)
- Physics questions: Will the reduction in local coupling improve:
- 1. the 150 GeV lifetime for protons? 2. the losses at the beginning of the ramp? 3. the transfer efficiency? 4. the emittance blowup on transfer? 5. or reduce the long-range beam-beam effect? 6. effect the time dependent skew quad correction and snap back at 150 GeV? 7. improve the luminosity lifetime? 8. improve beam stability, or make it worse?
- Other questions: 1) Will the reduction in local coupling make it easier (quicker) to tune the Tevatron to
- the desired operating point? 2) Will the reduction in local coupling make it easier to use the transverse dampers?

- David Harding:
- _[http://tdserver1.fnal.gov/tev-magnets/SmartBolts/TunnelReshimming20030527.doc](http://tdserver1.fnal.gov/tev-magnets/SmartBolts/TunnelReshimming20030527.doc)_

## Suggestion for Review of Smart Bolt Issues

**Suggestion for Review of Smart Bolt Issues**

- a)    Mike Syphers on physics motivation (an attempt to address the eight physics questions from M.Church.)
- b)    Dave Harding on how we will do all that, procedures, estimates, etc. (basically, he has all written up already)
- c)    Ray Stefanski - first look into risk analysis (you have to be prepared - talk to people first, understand concerns, and possibilities to screw things up... plus what it will cost us).
- d)    general discussion, followed by separate meeting of the committee of which should conclude in 1/2 page writeup on recommendations with pros and cons.
- Allocate 15 min for a), 15 min for b), 20 min for c) and 40 min for d)

- I’m not certain we’re ready for a review of this kind.
- Mike is working on the issues, and a possible scheme to deal with
- 	the skew quad component.
- TD has measurements and tests to complete. What happens to the field
- 	when the cryostat is elevated? Is the change repeatable from
- 	magnet to magnet?

## Charge (Magnet Stand Replacement)

- 1. About 69 stands will be available for the summer shutdown. These are
- These are a standard stand design with made of carbon steel, with an
- nickel coating.
- 2. Mike May has an upgraded stand designed. Will not be installed
- In the summer shutdown. Mike will tell us about it at next Monday’s
- meeting (Why not install sooner??)
- 3. Magnet elevation off floor has been measured for about 60% of the ring.
- 4. Quad Stands may need more rigidity. MM analysis gives natural
- frequency less than 100Hz! Can we measure this with our
- motion detectors?

**Charge (Magnet Stand Replacement)**

## Status of Magnet Stand Replacements

- six week shutdown gives us 22 working days (7 weeks)
- replace one dipole every 4 hours
- 44 dipoles per crew.
- 88 magnets can be done.
- Plan to use 2 crews.
- 19 stands on hand, 50 on order.
- Replace A & E Sector stands.
- Ring will be at LiN2 temperature?
- We are making one.
- Changes to stand are only material changes:

- More changes:
- 		1.      Elctro-less nickel plating will be used.
- 		2.      Base-plate will be made of stainless steel.
- 		3.      Larry Sauer, Chris Anderson consulted on this.
- 		4.      Mike May is working on a next generation design.
- 		5.      The 19 we have will be plated before the shutdown.

**Status of Magnet Stand Replacements**

- Except base-plate is wider.
- Special fixture will be built to take weight off existing magnet
- Dial indicators will be used to monitor magnet movement.
- How do we make certain that magnet doesn’t move radialy?? Bolts in back are spring loaded, so they could push the magnet radially.

- Mike May will propose a
- new design for the future.

## Dipole Stand Replacement Fixture

## MM estimate of quad frequency

## US Dipole Magnet Stand Design

**US Dipole Magnet Stand Design**

## DS Dipole Magnet Stand Design

## Roll Distribution Around the Ring

**Roll Distribution Around the Ring**

## Twist – This was Once a Dance

## Elevation Baseline

**Elevation Baseline**

## Elevations compared to ideal orbit.

- Elevations compared to ideal orbit.

## Elevations compared to ideal orbit.

## Horizontal Offsets near F0

**Horizontal Offsets near F0**

- 1mm = 39.4 mils

## Horizontal Offsets near C0

**Horizontal Offsets near C0**

- 1mm = 39.4 mils

## Horizontal Offsets - MAD

**Horizontal Offsets - MAD**

## HVAC: Potential Site Riser

- To bring the network into tunnel, we need to:
- Modify air vents top side.
- Build towers over the air ducts/risers.

- This also needs deep rod system installed on site.

## Rapid magnet survey techniques:

- Develop rapid survey methods:
- 	AMG is doing this.
- 	We may not be able to get the surveyors needed to do this.
- Develop elevation and horizontal offset fixture.
- 	Uses Murphy plugs for reference.
- 	Mike McGee, et al.
- Improved roll measuring fixture.
- 	New fixture that will be easier to use.
- 	Interface directly to laptop, LabView.
- 	Fred Nobrega. et al

**Hans with his roll measuring fixture!**

- We’re concerned that we will not be
- able to have all of the surveyors that we
- need. We are developing methods that
- can be implemented with ordinary people.
- We will solicit help from the experiments,
- Other beams, and other labs, as appropriate.

## Methods for “real time” motion detection.

- Simple Construction

- Elaborate Construction

- Todd has tilt meters in the tunnel.
- HLS as in MI-8/ Aurora Mine.
- Modified HLS as in (2) but less expensive.
- Stretched wire techniques. (x, y measurement)
- Home made HLS. Could do the entire tunnel

## Magnet Elevation off Floor

**Magnet Elevation off Floor**

## Action Items:

- Improve roll fixture – Done (JV, FN)
- Develop elevation/ horizontal fixture.
- a.	Use a fixture, or
- Use survey group with help from (?).
- Finish design and test of simple HLS system.
- Jessie’s simple system – test at MP-8
- Design and test stretched wire system.
- Develop cost and resource requirements for network.
- Measure bellows stress when magnet rolled in situ.
- Measure cryostat motion when magnet rolled in situ.
- Measure field change when cryostat elevated by 3 mils.
- Develop QC plan for smart bolt readjustment program.
- If we get all of this data, what will we do with it??

- Jim Volk – Shutdown Coordinator
- Sub-Teams
- Stand Replacement
- Bruce Hanna
- Mike McGee
- John Carson
- Mike May
- Dave Augustine
- Smart Bolts
- Bob Kephart
- Dave Harding
- Mike Syphers
- Gerry Annala
- John Carson
- John Tomkins
- Tom Peterson
- Data Handling
- Mike Church
- Jean
- Norm
- Dave Ritchie
- CDF & DZero

- 4. Magnet Survey (Configuration Control)
- 	a. Jim Volk		h. George Wojcik
- 	b. Bruce Hanna	i. Terry Sager
- 	c. Aimin Xiao	j. Todd Johnson
- 	d. Norm Gelfand	k. Duane Plant
- 	e. Fred Nobrega	l. Jesse Guerra
- 	f. Mike McGee	m. Jean Slaughter
- 	g. Hans Jostlein	n. Gerry Annala

## 4. Survey

- Establish vertical and horizontal nominal positions for all Tevatron Magnets. Ray, Aimin.(Done.)
- Remove roll from as many magnets as possible. Set magnets to nominal positions,
- especially magnets in houses that will be warmed up.  Bruce, Ray, Jim.
- Establish an alignment network. Ray, George Wojcik, Jim, Bruce.
- Install water level motion detectors in Sector B – Ray and Jim, Andre, Valdimir
- Install tilt monitors in suspicious locations in the Tevatron ring. – Todd, Duane, Bruce
- Make use of SDA to detect changes in the Tevatron. Ray, Bruce, Norm(Add Mike, Jean.)
- Improve roll measuring fixture, and develop a horizontal fixture. (Jim, Fred, Mike, Fred)
- Install a prototype stretched wire configuration – horizontal motion detector. (Jim, Hans, Jesse)
- Install a prototype capacitive height detectors (Bill Markel, Guerra, ray)(We dropped this??)
- Install a prototype DVDT/DVRT motion detection system. Mike, Todd. (We dropped this??)

- For the summer shutdown, we will install and test prototype systems.

- Next begin to put together detailed plans and cost estimates.

**4. Survey**

- We’ll need CDF & D0 participation
- and technical people from various places.

## Some questions raised during the meeting:

- What is the alignment budget for Tev stands?
- What can we measure or accomplish during normal downtime. How can we make best use of unscheduled down time?
- Make a list of motivations for these survey projects.
- Why are we doing these things?  Provide a short list of specs for each?
- Readout electronics designed by PPD may be used for homemade, and economical HLS devices.
- Even with 12 new site risers, we believe we can achieve 1⁄2 mm accuracy in horizontal offset measurements.
- The ideal orbit as we define it is not complete: The ideal orbit assumes that the correctors are off, and we do not have sufficient understanding of the coordinates of the beam to know how to establish an ideal under this definition.

## References

- Progress Report of the Tevatron Alignment Group, May 12, 2003.
- Possible Reshimming of Tevatron Dipoles in the Tunnel, 21 May 2003,
- 		David Harding, Jamie Blowers, John Carson, Ray Hanft, Pierre Bauer.
- Tevatron Dipole Alignment by Laser Beam, May 19, 2003, Hans Jostlein.
- Horizontal displacements measuring system (proposal),
- Budker Institute of Nuclear Physics, June-July 2002.
- Site Search and Investigation 1998- 2003, Clay Corvin, April 2003, Vol. 4
- 	Nos. 3-4, NLC News.
- The Vertical Alignment of the D0 Overpass in the Fermilab Main Ring,
- 	C.D. Moore, (Proceedings)
- SPS Data on Tunnel Displacements and the ATL Law, September, 1993
- 	V. Shiltsev and R. Steining, SSCL-Preprint-505.
- Vibrational Analysis of Tevatron Quadrupoles, C.D. Moore,
- 	(Private Communication.)
- LCLS Design Study Report, December, 1998, 12-1.
- Hydrostatic Leveling System with Laser Sensors, Rojsel and Stiefler.

## References cont.

- A Historic First on Accelerator Alignment, Danial Roux, 1993,
- 	Accelerator Alignment Conference.
- Ground Vibration Measurements for Fermilab Future Collider Projects,
- 	Baklakov, Bolshakov, Chupyra, Erokhin, Lebedev, Parkhomchuk,
- 	Singatulin, PR Special Topics–Accelerators and Beams, Vol I, 031001 (1998).
- Applications of Hydrostatic Leveling in Civil Engineering, D. Martin, 1993.
- Water Level Installation at A16, Jim Volk and Andrey Chupyra, February, 2003.
- BINP Hyrostatic Level Measurement System, A. Chupyra, private note.
- VLHC/NLC Slow Ground Motion Studies in Illinois, Shiltsev, Lach, Baklakov,
- 	Chupyra, Erokhin, Kondaurov, Parkhomchuk, Shubin, Singatulin,
- 	FERMILAB-Conf-01/152 June 2001.