Verifying TOF and LPS in Alice

Josh Briegal 21/08/12

Aims

• Verify the longitudinal compression scheme in ALICE

• Confirm Peter’s ELEGANT model is correct

• Re create data taken by Peter and Frank in shifts #3058 (AR1-BPM06) and #3076 (ST2-BPM04)

LC1GS VariedAR1-QUAD01/04 Varied#3058

AR1-BPM06Before Chicane

Shifted Parabola

ELEGANT consistently steeper

Confirms isochronous condition (~2.16A QUAD01/04)

LC1GS VariedAR1-QUAD01/04 Varied#3076

ST2-BPM04Post Chicane

LC1GS VariedAR1-SEXT01 Varied#3058

AR1-BPM06Before Chicane

LC1GS VariedAR1-SEXT01 Varied#3076

ST2-BPM04Post Chicane

Note:

Frank used 2.23A on AR1-QUAD01/04 not 2.19

Further Investigations

• Vary LC2GS instead of LC1 (Frank shift #3056)• Vary AR1-SEXT02 instead of AR1-SEXT01

LPS plots

• Tracking LPS as beam goes through the chicane

• Compare for different sextupole and quadrupole strengths at nominal energy

• Comparing LPS based on different beam distributions for different setups (THZ and FEL)

• All at nominal energy (~26MeV)

Before Chicane

AR1-SEXT01 varied

Black 0ARed 3ABlue 9A

Current Histogram

Before Chicane

AR1-SEXT01 varied

Black 0ARed 3ABlue 9A

Post Chicane

AR1-SEXT01 varied

Black 0ARed 3ABlue 9A

Current Histogram

Post Chicane

AR1-SEXT01 varied

Black 0ARed 3ABlue 9A

Before Chicane

AR1-QUAD01/04 varied

Red 2.11ABlue 2.15ABlack 2.19AGreen 2.23A

Current Histogram

Before Chicane

AR1-QUAD01/04 varied

Red 2.11ABlue 2.15ABlack 2.19AGreen 2.23A

Post Chicane

AR1-QUAD01/04 varied

Red 2.11ABlue 2.15ABlack 2.19AGreen 2.23A

Current Histogram

PostChicane

AR1-QUAD01/04 varied

Red 2.11ABlue 2.15ABlack 2.19AGreen 2.23A

THZ setup

Before Chicane

THZ setup

Post Chicane

FEL Black

THZ Red

Before Chicane

Current histogram

FEL Black

THZ Red

Before Chicane

FEL Black

THZ Red

Post Chicane

Current histogram

FEL Black

THZ Red

Post Chicane