# Presentation: 676152

## Main Injector For Collider Run II

- February 8, 2001
- Denton Morris
- dmorris@fnal.gov

- February 8, 2001

## The Many Hats of the Main Injector

- Stacking:  120 GeV protons to the Antiproton Source target
- Shots:	150 GeV protons to the Tevatron
- Shots:	150 GeV antiprotons to the Tevatron
- Shot setup:	8 GeV protons (reverse) to the Accumulator
- Shot setup:	150 GeV protons to the Tevatron
- Recycler commisioning
- NUMI
- MiniBoone
- 120 GeV Fixed Target

- February 8, 2001

## Keeping Track of what’s going on

- Notify – new and improved...
- 2D	8 GeV protons
- 29	120 GeV for Pbar production
- 2A	150 GeV antiproton transfers
- 2B	150 GeV proton transfers
- 	9   **9**   9   9   9   9   9   9
-  	   D  A  D  B  D  A  D

- February 8, 2001

## 8 GeV Protons from Booster

- All 8 GeV protons originate from the Proton Source
- PreAcc
- Linac
- Booster
- MI-8 line

- February 8, 2001

## Acceleration to 120 GeV for Antiproton Production

- 84 bunches (one Booster batch) of 8 GeV protons from the Proton Source are accelerated to 120 GeV and extracted from the Main Injector down the P1, P2 and AP1 lines to the Pbar target at AP0
- P1, P2 and AP1 line running in 120 GeV mode

- February 8, 2001

## 150 GeV Protons for Tevatron

- Nine batches of 11 bunches from Booster
- Accelerated to 150 GeV
- Coalesce 9 batches of 11 into 9 single bunches
- Bucket to bucket transfer to TeV
- P1 line running in 150 GeV mode

- February 8, 2001

## Coalescing

- Building a bigger bunch

- February 8, 2001

## Coalescing

**53 MHz bunch structure h=588**
**Overlay 2.5 MHz RF     h= 28 and 5 MHz h=56**
**Remove 53 MHz**
**Allow bunches to rotate**
**Recapture with 53MHz**

- February 8, 2001

## 150 GeV Proton Coalescing

- February 8, 2001

## 8 GeV protons for beamline and Acculumator Shot Setup

- Low intensity to approximate antiprotons
- P1, P2, AP1 and AP3 lines running 8 GeV mode

- February 8, 2001

## 150 GeV Antiprotons for Tevatron

- February 8, 2001

## 150 GeV Antiprotons for Tevatron

- 8 GeV in, 150 GeV out
- Coalesce 4 batches of 11 bunches into 4 bigger bunches
- Beamline gymnastics
- P1, P2, AP1 and AP3 beamlines running 8 GeV
- A1 line running 150 GeV
- P1/A1 load switching

- February 8, 2001

## Antiproton Coalescing

- The four batches of 9 bunches are coalesced into 4 big bunches
- Similar to proton coalescing

- February 8, 2001

## 150 GeV Antiprotons for Tevatron

- February 8, 2001

## Beamline Gymnastics

- Antiproton transfers to Main Injector
- P1, P2, AP1, AP3 running 8 GeV for Accumulator to MI
- Antiprotons from Main Injector to TeV
- A1 line running 150 GeV
- Problem:  P1 and A1 lines use the same power supplies with load switches.

- February 8, 2001

## Beamline Gymnastics

- Power supplies start at 8 GeV level with load switches to P1
- After injection power supplies ramp down
- Load switches switch to A1 line
- Power supplies ramp to 150 GeV for transfer
- Power supplies ramp back down and switch back to P1 loads

- February 8, 2001

## Where Are We Now?

- Protons for collisions
- Coalescing 7 bunches  (200e9 ppb)
- 1 bunch at a time (we have done two)
- ~80% efficient
- Longitudinal emittance ~3.2 eV-sec
- Need to understand the emittance growth that occures before coalescing
- Transverse emittance blows up during transfers

- February 8, 2001

## Where Are We Now?

- Antiprotons for Collisions
- 30e9 pbpb  (60mA stack)
- >90% efficiency
- Transverse emittance growth during Accumulator to Main Injector transfer

- February 8, 2001

## Where Are We Now?

- 120 GeV protons for antiproton production
- 4.5e12 protons on target (5e12 by June ’01)
- Production cycle time 1.46 seconds

- February 8, 2001

## Final Results?

- 400 pb-1  by Spring 2002

- February 8, 2001