# Presentation: 071716

## Studies Review: 08/25/03 – 09/08/03

**  ****Doug Moehs – FNAL**

- Machine Studies Weeks

- All Experimenters' Mtg - Sept. 08, 2003

## Stores Summary

| Store | Initial
Lum.
(E30) | Deliv’d
Lum. (nb-1) | Termination | Time
(hr) | Stack/
Unstack
(mA) | Comments |
| --- | --- | --- | --- | --- | --- | --- |
|  2943 | 39.7   |  1484 |  Intentional | 19.1  | 132/115 |  Pbars: 70.7% to HEP |
| 2953  | 36  | 1145  | Intentional | 15.5  | 112/101 | New Helix
Pbars: 71.7% to HEP |
| 2975  | 28.36  | 968  | Intentional  | 17  | 80/73  |  Lost 2 stores to Cogging
78.4% of Pbars to HEP |
|  2977 | 41.7  | 1708 |  Intentional | 17.7  |  149/134 |  |
| 2979  | 42 | 863 | Quench | 7.1 | 175/157 |  61.3% of Pbars to HEP |
| 2985 | 34 | 1315 | Intentional | 17.4 | 134/122 | 2.5 MHz transfers 
Trans. Dampers off
No MI closure |
| 2988  | 35.9 |  828 |  Intentional | 13.2  | 157/141 | Trans. Dampers off
TEL troubles
RF1 turned off 
New 150 GeV optics  |
| 2997  | 40.7 | 1555  | Intentional | 19.5 | 118/101  | Last store of the fiscal year
Trans. Damp. Recom.
75.3% of Pbars to HEP  |

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

**Notes:**
2.5 MHz transfers between the Accumulator and MI.  Prof. Of principle
Shot scrapbook log entry- Wed Sep 3 21:26:08 comment by...elvin --  As seen here, 2.5 MHz only was used for all of tonight's transfers. The longitudinal emittance to unstack was also limited to an upper bound of 1.3 eV-s. An asymmetric distribution was seen in the MI, again, on the later, larger emittance shots. All necessary commands for 2.5 MHz transfers from a pbar standpoint are coded into the Pbar sequencer. We'll assume this is now routine operation. 

On Shot 2988
-- Thu Sep 4 21:48:23 comment by...vs --  TEL blown and killed 4 proton and 4 pbar bunches (see plot), that cost some 20% in luminosity. As soon as ops turned it off LOSTP went down to 8kHz. Thanks to Stephen who happened to be in MCR and mentioned that bunches at the end of trains died and correctly concluded that this must be TEL. (I was seen average emittance blow up of pbars which was growing too fast and though it's scallops - so suggested remedy was lower vert tune... which would not - and did not help much ). 

Over the last two weeks we integrated 9.86 inverse picobars.  We were hoping to average 5 per week.

## Brief Study Summary

- Focused on machine studies for the last 2 weeks
- Semiparasitic studies
- whenever stacking for a store
- 10% of timeline
- Dedicated study periods separated by aprox. 16 hours.
-   Period 1:  8-12 hours of Pbar and/or MI studies
-   Period 2: 8-12 hours of TeV studies
- 2 stores between study periods
- Stack and store through the weekends
- In addition to studies, over the last 2 weeks:
- Approximately 140 store hours over the last two weeks
- Integrated just under 10 pb-1

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

**Notes:**
Optics
The study intents to minimize the round trip emittance growth for MI-Tev-MI transfers 
Reduced horizontal emittance by ~1.5pi

Transvers Dampers Goal of the studies for horz injection dampers: (1) Change out mix up/down module, test out gate card, verify that 3kW poweramp actually works in pulsed mode. (2) Recomission normal horz instability dampers 

SY120 resonant extraction 9/5/03
Studiers: Dave Johnson, Craig Moore, Chuck Brown, The othersThe goal today will be to get resonantly extracted beam down to Meson.  - dej 
Did not see resonant extraction away from MI.  Losses at the labertson were high.

## TeV Studies and Changes

- Studies
- Losses during the squeeze and at CDF
- Commissioned new high energy ramp helix
- Recommissioned transverse dampers
- Commissioned new optics at 150 GeV
- Standard maintenance studies included:
- Two 36x4 stores to find a cogging problem
- Work on the TEL
- 16 Hour accesses to optimize the Fall shutdown
- Cold lift measurements
- As found measurements

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

**Notes:**
16 hour access for TeV
8 hour access for all other machines

36x4: a) combined pbar loss on ramp and squeeze is about 10% - not worse than in usual stores; b) during and after squeeze p-beam went coherent - few bunches were blown hor to 60-90 pi; c) squeeze tunes, coupling and chromas were from "file 1", i.e. old values, and should be replaced with "file 3" values; d) it seems to be safe to go and try new ramp helix in 36x36 store. 

Tue Aug 26 21:20:43 comment by...prk --  CDF proton losses were on their way up past 20khz hwen we started tuning. The coupling changes stopped the growth, and the Vert chrom dropped the losses a little, but most of the gain was from vert tune. 

## Machine Updates 

- Main Injector
- Commissioned 2.5 MHz transfers along with Antiproton Source
- Measure current optics of MI-8 line
- SY120
- 8 hour shutdown: Installed and tested new septa motors
- Preparation for “slow” resonant extraction
- Fast extraction: physics run
- Slip stacking
- NuMI multi-batch acceleration:
*Achieved intensities up to 2.3E13 with 5% loss*
- 2.5MHz acceleration
- MI transverse dampers

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

**Notes:**
The objective for NuMI is 2.4E13 with less than 5% loss
Peak intensity achieved 3.3E13 at 8GeV with good lifetime.

Recycler:  looks at the ion current produced by the beam.
Old BPM’s are being converted into this system

## Machine Updates 

- Antiproton Source
- Debuncher studies
- Reverse proton studies
- Complete set of admittance measurements
- Proton emittance growth
- Accumulator dispersion
- AP2 BPMs
- Accumulator tunes across the aperture
-  measurements automated

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

## Automated Tune Measurement

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

**Notes:**
Pbar studies:  Elvin Harms
All of our high priority tasks were completed and some extras got done as well. Most notably, a new scheme to measure the Accumulator tunes across the aperture without disrupting operations was demonstrated – a representative plot is below. The two traces show the Vertical and Horizontal tunes respectively on the y-axis and the beam revolution frequency (inversely proportional to the momentum) on the x-axis. The injection/extraction orbits are the left edge and the core is at the right. We also had an extensive list of reverse protons studies which got completed. Let me know if you have any questions or want more information/pictures.

## Machine Updates

- Recycler
- 8 hour shutdown:  Installed final 2 houses of new BPMs
- Commissioning new BPM system
- Commissioning Ion Clearing Current Monitors
- Old BPMs used in place of ion gauges
- Proton Source
- Cogging studies for NuMI-multibatch injection
- Turned off MiniBooNE at 08:00 on September 2
- Activation in the Linac reduced by a Factor of 2

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

## Linac Activation Reduction Associated with Turning off MiniBooNE

- The last bar is an average of all data points

- Slide provided by Elliott McCrory

- Ratio of one foot measurements on 9/7/03 and 9/2/03

- Doug Moehs (Phil. 4:6-9)

- All Experimenters' Mtg - Sept. 08, 2003

**Notes:**
9/8/03 Elliott McCrory:
This plot, if you can see it, is the ratio of the activation, at one foot, between the activation in the Linac tunnel immediately after MiniBooNE shut off (9/2/03 09:00) and after all beam was turned off (9/7/03 00:30).  The last bar, at 44%, is the average of all the activation reading ratios.

Corresponds roughly to a factor of 8 reduction of particles.
First measurement: out of lambertson ~350 mR/hr at a foot first measurment:  hot spot.