# Presentation: 321311

## f

- On Tevatron TevTuneTracker,
- Brief Status report on Uncoalesced Beams

- Paul Lebrun
- Fermilab

***December 13 2002****** ***

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Tevatron Tune Tracking 

- Automatic fits of Spectrum Analyser data is hard, as it is just a mess of broad and signals.
- Goal : express “the art of picking the right line” into a reproducible algorithm that can be implemented on a modern computer, and can be run at ~ 1 Hz
- Status: Both for Coalesced beam and uncoalesced beam, it starts to work.
- Need to keep comissioning it ..
- Short term project: new Shottky will provide better information.
- Long term: Provide proof of principle that such difficult fits can be done .

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Status, Hardware,  Software..

- The vsamcr file have been analysed by John Marraffino, showing that some information could be gained.
- An HP3561A “box”  has been connected to the existing proton shottky signal by Dean and Charlie Briegel
- Who has also written a nice ACNET Read Wave Form utility..
- Which, thanks to Ron Renchenmaker,  Kevin Cahill, Jim Patrick, ... , I am able to read on nova.
- And fit, using the infrastructure written by John M., based on the root package.
- And,. Thanks to a XML-RPC based library, I am writing the result of the fits to ACNET

- Tevatron Tunes - P. Lebrun

- December 13  2002

## New ACNET Devices 

- If the T:MAX111 and T:MAX110 are set “the right way for getting the V (vertical) signal, and if “things are running”..
- T:TUYXBR:  The horizontal tune, either deduce from the narrow Synchro-betatron lines. Expected values: around 0.584, or conversely, the broad bump we got during normal store, at ~ 0.589
- First element : the value :
- 2nd : the error
- T:TUYYBR : Vertical tune, expected around 0.574 (nominal) to 0.580 Again, two elements, value and error..
- T:TUYuWD : the tune width.  Either the Synchro-betatron splitting , or the width of the broad spectra. “u” stands for either Y or X, for the vertical and horizontal planes, respectively.
- More to come...

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Uncoalesced Beam, taken during Mike Martens   Tev. Tune studies, Dec 11 2002. 

- Tunes, V = 0.569115, H = 0.587459, Synch split, H = 0.001812, V = 0.00170,  Predicted = 0.00168

- 16:36

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Algorithms..Uncoalesced..  

- First, Histogram, on a linear Y scale.
- Scale such the noise level (~-90db) corresponds to ~0.5 counts per bin.
- Smear (or smooth), on a big scale (every bin content is spread, Gaussian wise, to neighboring bins, until we get a fit where the maximums of the 2 gaussian are within 25 % of the maximum of the histograms. (no chi-square cuts!)
- Fit Two gaussians. This determines the broad value of the Horizontal and Vertical tunes.
- Make two distinct new histograms, one for each region, using the original data.
- Smooth, Cern algorithm, two times.
- Fit with 5 Breit-Wigners, with a fixed width and fixed splitting.

- Tevatron Tunes - P. Lebrun

- December 13  2002

## This was at 150, at 980, same beam.. 

- Tunes, V = 0.571733, H = 0.587999, Synch split, H = 0.0007232, V = 0.000659,  Predicted = 0.0065

- 16:55

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Back to 150, a bit later.. 

- Despite missed bumps, Synch split, H = 0.0017312, V = 0.0016207,  Predicted = 0.00166

- 23:04

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Owl shift...  

- 05:05

- Despite  weak bumps, Synch split, V = 0.001799,  Predicted = 0.00165

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Owl shift...  

- 05:36

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Owl shift...  

- Despite  weak Vertical signal (no tickling, I presume) (10 db above noise),
-                we got a meaningful Verticla tune measurement, Sync-beta (0.00185)

- Tevatron Tunes - P. Lebrun

- December 13  2002

## Conclusion.. 

- It is possible to express a measurement method into an algorithm that runs on a computer, as fast as one can read from a screen.
- However, these tunes  number were not reported to ACNET last Wednesday, as I was tuning the algorithm..
- It could be.. Just a switch in the code...
- But  I am stuck ! No more signal on “MY BOX”!!.  The signal got away Wednesday or Thursday, for studies.. Can I have it back?

- Tevatron Tunes - P. Lebrun

- December 13  2002