# Presentation: 492516

## APEXd-Au ‘en game’PP Run

- Fulvia Pilat
- Machine-Experiments Meeting
-  January 15, 2008

## APEX stats Run-8 (so far)

- Stats Run-7:
- APEX availability: 72%	Time at store for physics: 49%
- Stats Run-8 (so far):
- APEX availability: 77.5%
- Physics, last FIVE weeks is 101.55hr 60.4% Physics, last SIX weeks is 98.3 hr 58.5%Physics, last SEVEN weeks (all of Run8) = 94.8 hr 56.4%
**So far we meet our goals for Run-7 (mid 50%) for the entire run, and for the last 5 weeks we meet our “ERTAF” goals**
- (better reliability of the PS system)

## Uptime PS system

- Compare first 9 weeks of operations Run-7 vs. Run-8

## APEX d-Au Run-8 - status

- Completed:
**08-36****	****0A**	_**IBS with decoupling  **_******	****transverse stochastic cooling**
**08-17****	****0A****	**_**Test of ramp and operations with beta*<0.8m (with d-Au)  26h total**_
**	****	****	**_**Beta* measurements – 2 techniques + test of IP knobs**_
**	****	****	******** ****30+%**_** **_**luminosity**
**06-31****	****0A****	**_**ORM Measurements  **_****** *****beta beat correction***
**08-01****	****1A** 	 _**Electron cloud location **_********* performance limits***
**08-18****	****1A****	**** **_**Stability threshold at transition **_********* performance limits***
**08-07****	****1B**  	_**Energy Loss of Debunched Beam**_
- Running:
**07-33****	****A0**	_**Tune and chromatic drift correction at injection **_********* operations***
**08-14****	****A0**	_**Collimation on the ramp  **_********* performance limits***
***08-02******	******1B******	***_***Au31+ in AGS***_

## APEX Run-8 d-Au To Do

- 08-03	A0	_**Transition crossing longitudinal matching as a function of RF**_
- 08-06	A0	_**Measuring and modeling linear and nonlinear chromaticities **_
- 07-19	A0	_**Common Mode Noise Measurement**_
- 08-12	A0	_**Development of IBS-suppression lattice (100 or 110 deg)**_
- 08-25	A0	_**Transition instability as function of chromaticity jump**_
- 08-27	A0	_**Measure and localize gradient errors**_
- 08-34	A0	_**Beta-Dispersion Beating & Correction**_
- 08-29	A0	_**Beam profile measurement with CNI polarimeter**_
- 08-16	A0	_**Using phasing of two RF cavities at transition**_
- 08-28	B0	_**Hybrid Tune Tracker**_
- 08-31	A1	_**Transition Instability Modes**_
- 08-24	B2	_**Study of possible Cooling of Au_77+ in AGS  **_***(in parallel)***
- 08-37	***A0***	_**Anomalous BTF at injection**_
- 08-38	***A0***	_**Yellow radial feedback measurements**_

## APEX: D-Au summary

- We devoted considerable time (30+) on issues that are in the ‘gray area between APEX and developments (beta* squeeze, knobs, etc). This is a flexible model that works well, however
- To complete even the A0 studies approved we would need **4 sessions** of APEX until the end of d-Au, **5 sessions** with contingency (assuming present APEX uptime)
- _We really need the 3 planned sessions (January 16,23,27) at the end of d-Au_

## APEX Schedule January 15-16 2008

**6am**

**2am**

**8am**

**12am**

**8pm**

**06-31**
**8-27**
**ORM**
**Corrections.**
**Optics**
**Satogata**
**Bai**

**7:00 am**
**Injectors**
**OFF**

**Injection**

**08-14**
**Collimation**
**on the ramp **
**Drees**

**08-17**
**IP**
**Knobs**
**Ptitsyn**
**Malitsky**

**10pm**

**4am**

**08-24**
**Au77**
**Trbojevic**
**+team**

**Ramps**

**Store**
**6-12 bunches**

**Store**
**BBQ**

**08-29**
**Profile with polarimeter**
**Huang, ****Sivertz, **
**+team**

**08-28**
**Hybrid Tune**
**Tracker**
**Cameron**
**+team**

**Injection**
**BBQ**

**08-25**
**Chrom**
**Jump @inj**
**Montag**

**08-03**
**Longitudinal matching**
**@transition**
**Abreu**
**Bai**
**Blaskiewicz**

**Ramps**

## APEX in the PP run

- The plans for PP advocates a (relatively) conservative beta* of **90 cm** for operation with development for lower beta* (<**70cm**) in APEX
- At the same time we need to make sure that high priority studies – with **polarized beams** and **beam-beam** studies – get done as well
- At the moment we have **3 APEX sessions** planned with one possible more at the end of the PP run. If we do beta* in APEX we will need the extra time to do the rest of the program.

## Approved studies with PP

_**Polarized Protons**_
**07-03****	****0A****	**_**Measure driven coherent spin precession**_
**08-09****	****0A****	**_**Polarization profile using the RHIC Carbon Polarimeter**_
**08-10****	****0A**	_**Rate dependence of the RHIC Carbon Polarimeter**_
**08-23****	****0A****	**_**RHIC Polarization variation with time**_
**08-19****	****0B ****	**_**Spin tune and decoherence measurements**_
**08-05****	****1A**	_**Spin Echo and Resonance Interference**_
_**Protons**_
**08-17****	****0A**	_**Test of ramp and operations with beta*<0.7m**_
**08-08****	****1A** 	_**Long-range beam-beam interactions**_
**08-11****	****1A**	_**Lifetimes of non-colliding proton bunches**_
**08-35****	****1A****	**_**3Qy resonance measurement and correction**_
**08-33****	****0B****	**_**Chromaticity Feedback**_
_**+ studies from d-Au that could be done with protons too**_