# Presentation: 851558

## Thoughts on SY120 Operation During FY’05

- David Johnson
- Accelerator Division/Recycler Department
- October 1, 2004

- Beams-doc 1387 -v2

- David Johnson     SY120 talk to MIPP

## MI Filling: Length of MI = 7 X Booster:  Booster has  84-53 Mhz RF buckets (called a batch)  
Injections
Full batch(s):  up to 6 batches with abort gap
Partial batch:  < 84 bunches used for Collider and SY120
Slip stacking:  merging 2 batches -> single high intensity batch (see next slide)
Extraction
Single Turn: 
MI52 kicker (trise ~ tfall ~  700 ns) -> to P1 beamline (stacking)
MI60 kicker (trise ~ 1.6 us  tfall~7 us) -> to NuMI beamline
Resonant: (slow spill)  1⁄2 integer extraction :  MI52 septa
Intensities
Pbar production: 5.5E12 single batch -> <8E12 slip stack 
NuMI: 2.5E13 (in 5 batches)
Collider protons:  2.7 to 3E11 coalesced into single bench
SY120: has been 2 to 6E11 (in 30 to 84 bunches)

- _Injections_
- Full batch(s):  up to 6 batches with abort gap
- Partial batch:  < 84 bunches used for Collider and SY120
- Slip stacking:  merging 2 batches -> single high intensity batch (see next slide)
- _Extraction_
- Single Turn:
- MI52 kicker (trise ~ tfall ~  700 ns) -> to P1 beamline (stacking)
- MI60 kicker (trise ~ 1.6 us  tfall~7 us) -> to NuMI beamline
- Resonant: (slow spill)  1⁄2 integer extraction :  MI52 septa
- _Intensities_
- Pbar production: 5.5E12 single batch -> <8E12 slip stack
- NuMI: 2.5E13 (in 5 batches)
- Collider protons:  2.7 to 3E11 coalesced into single bench
- SY120: has been 2 to 6E11 (in 30 to 84 bunches)

**A Few Definitions**

- David Johnson     SY120 talk to MIPP

## Slip Stacking for Pbar Production

**1****st**** batch**

**2****nd**** batch**

- Data from Kiyomi

- 8E12

- Increase # of protons on target
-   -  increase stacking rate
- Before shutdown increase initial  stack rate from 12 to 14 mA/hr

**Slip Stacking for Pbar Production**

- David Johnson     SY120 talk to MIPP

## Current SY120 Modes of operation

**Modes of operation for slow spill to SY**
** ****Dedicated slow spill (initial mode) **
** ****Mixed-mode (single batch to pbar, 7/9)**
** ****Mixed-mode (2 batch slip-stacking to pbar, 8/19)**
**Mixed-mode development required significant time and modifications **
**Mixed-mode operation uses: **
**The same optics in P1 and P2 beamline for **
**   ****stacking and SY120**
**The same major dipole settings in P1/P2**
** ****Different dipole trim settings **
**All three modes use same MI ramp and timing,**
**   ****but different TLG modules (**_**easy to switch modes**_**)**
**All three modes have been commissioned**
**The minimum cycle time 2.8 sec**** **
**The spill length is 655 ms  **
_**Can provide up to ~14 sec of spill/min**_

**Current SY120 Modes of operation**

- David Johnson     SY120 talk to MIPP

## Two flavors of mixed-mode

- Simple mixed-mode

- Slip-stacking mixed-mode

**Beam to pbar**

**Beam to SY**

**Pbar batches**

**RF recapture**

- Qh

- QXR

**Losses @F18**

**Two flavors of mixed-mode**

- David Johnson     SY120 talk to MIPP

## MI Cycle Rate for Pbar Stacking

**MI Cycle Rate for Pbar Stacking**

- Pbar stacking rate

- Pbar stack size

- ~2.2 sec

- $29 cycles in 60 sec

- ~2.7 sec

- #hrs/day spent stacking at
- over 35 mA/hr depends on
- how the RR is integrated
- into Collider Operation

- 220

- 55

**Store 3657 L****0****>1E32**

**SY120 cycle time 2.8 sec**

- David Johnson     SY120 talk to MIPP

## Mixed-Mode Stacking Time Line

- SY120 rep rate 4 sec  -> 8.6 sec spill/min !!

- SY120 Mixed
- -mode cycles

- Recycler

- Studies

- Pbar evt

- SY120 evt

- David Johnson     SY120 talk to MIPP

## MI Department Priorities

- Run II
- Provide protons for Tevatron (coalescing, 2.5 Mhz acceleration, longitudinal dampers, etc...)
- Providing protons for stacking (beamline support, slip stacking)
- Supporting Recycler operation (rapid transfers)
- Mixed-Source operation (pbars Acc & RR)
- NuMI
- Support commissioning NuMI beamline
- SY120
- Support SY120 program with _existing_ dedicated and mixed mode operation
- Commission Bucker system (Instrumentation, MI, EE Support)

- David Johnson     SY120 talk to MIPP

## How does SY120 fit into the Program, I 

**What determines the cycle time, flattop time, and repetition rate? **

- Minimize impact on Run II and stacking and NuMI
- Maximize beam to users within Program Planning guidelines

**It will be an optimization of:**
**number of cycles per min in the timeline**
**the spill length per cycle**

**How does SY120 fit into the Program, I **

- The minimum cycle time is determined by a combination of
-  MI feeder peak voltage-> ramp rate
-  RF power -> ramp rate
-  BL PS voltage and rms current limits ->HVF12/SY(?)
-  Available magnet cooling
- in the MI, P1, P2, P3, Switchyard, and Meson beamlines

- Want to maximize spill time /cycle, & be compatible with stacking at low stacks

- The repetition rate ->  Operational Considerations (stacking,studies,
-                                        Store length,RR utilization,NuMI comm/oper
-                                       * current limit MI Corr RMS -> quad alignment

- David Johnson     SY120 talk to MIPP

## How does SY120 fit into the Program, II

**How does SY120 fit into the Program, II**

- During NuMI Commissioning

- During NuMI running (when will this be? Spring ?)

- NuMI / stacking cycles will not be at 2 sec rep rate (my opinion)
- Best option to utilize Mixed-mode (with/without SS)
- Max rep rate is 2.8 sec (goal) – run all the time
- Number of cycles depend on utilization of RR/Operational Issues

-  Division indicated stacking/NuMI will be at 2 sec rep rate
-  How does SY120 fit in? Mixed-mode stacking or dedicated SY cycle?
- Dedicated options:
- Increase FT length of 120 GeV cycle (3 sec ->6 sec->longer?)
-  for dedicated cycle only (precludes further mixed mode oper)
-  FT length determined mainly by MI corrector rms and
-  Beamline power supply rms /SY cooling
- Reduce energy of SY120 cycle to 100 GeV  (last resort-much work)
- Mixed-mode stacking-NuMI-SY120 (not possible)

- Beams-doc 880 (preliminary analysis for 6 sec FT)

- David Johnson     SY120 talk to MIPP