Extraction of Beam into TT40

Slide1: 

Extraction of beam into TT40 (Transfer Line from SPS to LHC) Mitaire Ojaruega University of Michigan     Dr. Mike Lamont CERN, Geneva, Switzerland

SPS Overview: 

SPS Overview SPS – fixed target experiments andamp; injector to LHC (2006)

Towards the LHC: beam tests: 

Towards the LHC: beam tests TT40 2 x 24 hours, September/October 2003 TI8 4 x 24 hours, September 2004 LHC sector test (one eighth of the ring) 2 weeks, April 2006 TI2 commissioning April 2007 LHC commissioning April onwards 2007

SPS control room: 

SPS control room

Tunnel: 

Tunnel

Main elements: 

Main elements Bending Magnets dipoles Focusing Magnets quadrupoles Closed orbit Measured with pickups Corrected with small dipole corrector magnets Extraction Bump circulating beam towards extraction point Fast kicker magnet – kick beam out of ring into extraction channel Septum magnet to guide beam into transfer line Beam: bunched, lots of bunches, around 1011 particle per bunch

Closed orbit & extraction bumps: 

Closed orbit andamp; extraction bumps

Slide8: 

4 x HB, 4 x VB, 5 x MKE, 1 x TPSG4, 6 x MSE

Slide9: 

Basic accelerator physics As particles speeds around the ring, it performs transverse oscillations. These obey the Hill’s Equation. The solution to Hill’s equation is similar to that of the SHM… This solution maybe parameterized in terms of Twiss parameters, which allows the calculation of: beam size, trajectory correction etc. Very important for good control of beam at extraction.

MAD: 

MAD Calculated closed orbit extraction bump in SPS Produced input files for the first part of TI8 Calculated Twiss parameters for this part of the line. Optics calculations are (at CERN) usually done with MAD. (Takes as input a description of the accelerator or transfer line and magnet strengths - can calculate lots of stuff.)

MAD sequence files: 

MAD sequence files TI8: SEQUENCE, L = 2699.14948; PT4: marker, AT = 0; MDMV400097: MDMV1, AT = 3.706; BPK_400099: BPKV1, AT = 4.305; QTMD400100: MQI1, AT = 5.5; MDMH400104: MDMH1, AT = 6.774; BTV_400105: OTR1, AT = 7.373; MBHC400107: BH1, AT = 10.5, MBHC400118: BH1, AT = 16, MBHC400129: BH1, AT = 21.5,; QTRF400200: QTL2, AT = 28.252; BPK_400207: BPKH2, AT = 30.475; Corrector Pickup Quadrupole Screen Bending Magnets Corrector

Beta Function : 

Beta Function

Slide13: 

Closed orbit extraction bump

Summary: 

Summary Beam to LHC from SPS at 450 GeV via TI8 Extraction: bump, kick, septa, and then bending and focusing in the line. Lots of instrumentation to make sure the beam is going in the right direction Bumps and Twiss parameters calculated using MAD Will be tested in extraction test which takes place in 3 weeks

Slide15: 

Acknowledgement Many thanks to my supervisor Mike Lamont, Jean Krisch, Homer O’Neal, Tom Dershem, Busted, Lucas, Obnoxious Mute, Mr. Word, Ms. Cool, Slow Blinker, Phi Bang, Sambuca, Terrorist, Mr. Fish, Brian Adams, Anti word, Dr. Love National Science Foundation and the University of Michigan