# Presentation: 791902

## RHIC Polarized Proton Run 2004

**M. Bai**
**C-A Department, BNL**

## PP FY04 Run Goal

**55 bunches with 1x10****11**** per bunch, emittance: 15 ****** mm-mrad
**Average current/ring: 70mA**
**Peak luminosity: **
**                    ****11x10****30 ****cm****-2****s****-1**
**Average luminosity: **
**                   ****6.0x10****30**** cm****-2****s****-1**
**B* = 1m at STAR and PHENIX**
**Polarization at store >=0.40**
**Ultimate goal for PP FY2004: **
**55 bunches w. 2x10****11**** per bunch **
**112 bunches w. 1x10****11**** per bunch **

## Strategies to achieve the goal

**Ameliorate beam-beam effect**
**New working point**
**Reducing beam-beam driven resonances by adjusting phase advance between IRs**
**IR non-linearity correction**
**Pushing and learning the limit of the achievable proton intensity **
**NEG coating**
**beam scrubbing**
**Beta squeeze along the ramp**
**Avoid hysteresis effect when beta squeeze at flattop, so the machine is more reproducible**
**Better model engine**
**Ironing the tune & chromaticity along the ramp(Johannes)**
**PLL: feedforward**
**Smaller emittance to gain luminosity**
**Multi-bunch injection**
**Gain the average luminosity**

## Lattice for PP FY04 Run

**Lattice**
**Injection: 10 10 10 10 10 10**
**Store: 1 1 3 10 3 10**
**Injection energy**
**gamma=25.937(Ggamma=46.5)**
**golden orbit**
**Same as FY03 RUN except an additional 10mm H separation bump at IP 12 for Jet Target**
**The separation bump should remain the same from injection to flattop.**
**Snakes on DC, spin rotators off for calibration**
**Local orbit bump at injection to compensate the orbit excursion at snakes**
**Rotator on for testing if time permits**
**Question:**
** ****for the future, how often experiments will need to change the rotator configuration?**

## Time Table

**Total 5 weeks**
**April 12 – May 17, 2003**
**Phase 1: week 0 – 1**
**Phase 2: week 1 – 2**
**Phase 3: week 2 – 4**
**Phase 4: week 4 – 5**

**April 12**

**April 19**

**April 26**

**May 3**

**May 10**

**May 17**

## Phase 1 – week 0 – 1

**Ring access: 3 days + 1 day contingency**
**Jet Target installation**
**RF common cavity shortout**
**Magnet test ramp to 100 GeV (ps crew + Johannes)**
**Exercise snake magnet and spin rotator (ps crew + Waldo + Johannes**
**Others if there’s any**
**Injection setup: 3 days**
**Establish circulating beam in B&Y**
**AtR setup: Nick Tsoupas**
**RF work and Injection kicker timing: Wolfram and RF crew**
**Multi-bunch injection**
**Instrumentation setup**
**Bpm(esp. The bpms at snakes), IPM, PLL, Schottky, WCM: Todd, Pete, ...**
**Injection damper: R. Michnoff**
**E-detector: P. He, Ulbado, S. Y. Zhang, ...**
**CNI polarimeter: CNI experts**
**Machine tunning(at one of the working point candidates)**
**Orbit correcton: Vadim, ...**
**Decoupling: Joanne, Fulvia, Wolfram, Todd, Mei**
**optics measurement & correction: Todd, Mei, Johannes, Rama, ...**
**Jet target tunning: parasitic, Yousef, Sandro, ...**

## New working point development 
New working point scan at injection (Rogelio, Wolfram, Haixin, Vadim, Waldo, Mei and others)
Beam in collision
Lifetime vs. working point
Backgrounds vs. working point (56 bunches)
Polarization vs. working point (56 bunches)
Ramp development with the new working point
Good transmission efficiency
Good polarization
Store activity
Good lifetime at flattop
Good luminosity lifetime
IR non-linear resonance measurement and correction:
IR non-linear work force
Orbit bump closure: Vadim, Fulvia
Polarization development (Haixin, Vadim, Waldo, Mei and others)
Polarization vs. Different orbit rms at one of the strong resonances location
Polarization vs. Different tunes at one of the strong resonances location
Jet Target tunning: parasitic to the machine development 
			          (Yousef, Sandro, and others)
Check whether there is any depolarization resonances with 55 bunches
Check any dependence on beam intensity
Parasitic to the machine development

**New working point scan at injection (Rogelio, Wolfram, Haixin, Vadim, Waldo, Mei and others)**
**Beam in collision**
**Lifetime vs. working point**
**Backgrounds vs. working point (56 bunches)**
**Polarization vs. working point (56 bunches)**
**Ramp development with the new working point**
**Good transmission efficiency**
**Good polarization**
**Store activity**
**Good lifetime at flattop**
**Good luminosity lifetime**
**IR non-linear resonance measurement and correction:**
**IR non-linear work force**
**Orbit bump closure: Vadim, Fulvia**
**Polarization development (Haixin, Vadim, Waldo, Mei and others)**
**Polarization vs. Different orbit rms at one of the strong resonances location**
**Polarization vs. Different tunes at one of the strong resonances location**
**Jet Target tunning: parasitic to the machine development **
**	****	****	****          ****(Yousef, Sandro, and others)**
**Check whether there is any depolarization resonances with 55 bunches**
**Check any dependence on beam intensity**
**Parasitic to the machine development**

**Phase 2 – week 1 – 3**

## Calibration of CNI against Jet target

Dedicated beam with stable polarization to get 10% measurement
Steady injector performance
Intensity, polarizatio
Reliable RHIC performance
Orbit control, procedures to avoid slow deteriorations of the orbit and etc.

**Dedicated beam with stable polarization to get 10% measurement**
**Steady injector performance**
**Intensity, polarizatio**
**Reliable RHIC performance**
**Orbit control, procedures to avoid slow deteriorations of the orbit and etc.**

**Phase 3 – week 3 – 4.5**

## Spin tune measurement
Mei, Waldo, Haixin, Vadim, CNI polarimeter crew
Measure polarization vs. ac dipole frequency

Spin flipping
Mei, Waldo, CNI experts
Measure the spin flipping efficiency vs. different spin tune (different snake configuration)
Measure the spin flipping efficiency vs. different sweeping frequency
Measure the spin flipping efficiency vs. different spin flipper strength.

Beam scrubbing
Still under evaluation on its resulted radiation impact on the beam instrumentations, esp. bpm electronics. 

**Mei, Waldo, Haixin, Vadim, CNI polarimeter crew**
**Measure polarization vs. ac dipole frequency**
**Spin flipping**
**Mei, Waldo, CNI experts**
**Measure the spin flipping efficiency vs. different spin tune (different snake configuration)**
**Measure the spin flipping efficiency vs. different sweeping frequency**
**Measure the spin flipping efficiency vs. different spin flipper strength.**
**Beam scrubbing**
**Still under evaluation on its resulted radiation impact on the beam instrumentations, esp. bpm electronics. **

**Phase 4 – week 4.5 – 5**