9/25/2006 All experimenters meeting A. Jansson 1

Tevatron Ionization Profile

Monitors

Andreas Jansson

9/25/2006 All experimenters meeting A. Jansson 2

Team rooster

Accelerator DivisionA. Jansson, C.Lundberg, D.Slimmer, L.Valerio, J.Zagel, T.Anderson, A. Chen, R.Dysert , S.McCormick , S. Suleimani , C.Rivetta, B.Hively , D.Miller , J.Volk

Particle Physics DivisionK.Bowie, T.Fitzpatrick, A.Bross, H.Nguyen, T.Zimmermann Z.Tang

Computing DivisionR.Kwarciany, M.Bowden

Technical DivisionH.Glass, D.Harding, V. Kashikin

Also thanks to the DOE for the RunII upgrade money!

9/25/2006 All experimenters meeting A. Jansson 3

Motivation

• Luminosity is inversely proportional to beam size.

• Don’t dilute the emittance!

• Measure beam size turn-by-turn, especially at injection (to detect focusing errors).

9/25/2006 All experimenters meeting A. Jansson 4

IPM detector

0.2T

MCP-1kV-100V

0V

0V

-9.9kV-10kV

All signal cables are enclosed in a Faraday cage!

9/25/2006 All experimenters meeting A. Jansson 5

DAQ system

• CMS-QIE chip digitizes signal in tunnel.

• Serial data uplink on optical fiber.

• Receiver and data buffer in upstairs PC

• Timing + QIE clock + QIE clock supplied from PC thru cat-5E cable

Timing card(PCI)

Timingfanout

QIE cards(16x 8 ch)

Data Buffer(2x 8 links)

(PCI)

Host PC (LabView)

Service buildingTunnel

9/25/2006 All experimenters meeting A. Jansson 6

Setup

Control PCE0 service building

IPM detector and QIE boardsTev E0 straight section

Nitrogen injection systemTev E0 straight section

9/25/2006 All experimenters meeting A. Jansson 7

Beam profile at 150GeV

• Proton bunch #22 at 150GeV during store #4772.

• Measured beam size 1.05mm, turn-by-turn variation ~50um.

• Total signal per bunch ~1.7pC.

1 cm

30 turn average

single turn

Single bunch proton profiles

Magnet at 200A

9/25/2006 All experimenters meeting A. Jansson 8

Flying wire comparison

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1 4 7 10 13 16 19 22 25 28 31 34

Bunch

Bea

m s

ize

(mm

)

Flying wire

IPM

y = 1.0089x

0

0.5

1

0 0.5 1

Flying wire

IPM

Known electronics problem (cross talk from timing pulse)

Comparison of vertical beam size from IPM and nearby Flying Wire.Tuning of abort gap cleaner timing had caused blow-up of certain bunches. From MAD lattice file, expect a 13% wider beam at Flying Wire. See ~1%.

9/25/2006 All experimenters meeting A. Jansson 9

Injection turn-by-turn

0.2 0.4 0.6 0.8

0.1

0.2

0.3

0.4

Proton bunch #21 turn-by-turn

1 cm

Store #4772 Magnet at 200A

RMS profile width

0.9

1.0

1.1

1.2

1.3

[mm

]

0.0 0.5 1.0

0 10 20

FF

T0 10 20 30 40

0

5

10

15

20

25

30

0

35

turn

s

9/25/2006 All experimenters meeting A. Jansson 10

Transfer tuning study

• September 20th: changed selected x-fer line quads

• Nominal settings• Q701 at -22A• Q701 at -42A• Q711 at -25A

NB. Q711 was found to steer the beam significantly

9/25/2006 All experimenters meeting A. Jansson 11

Measured mismatch vectors

• Nominal settings• Q701 at -22A• Q701 at -42A• Q711 at -25A

• Need to increase Q711 by ~15A (saturation?)

• Should result in 5-10% smaller vertical emittance

• Should have very little effect on horizontal plane.

• Should have been tested this morning…

-0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

9/25/2006 All experimenters meeting A. Jansson 12

A first look at pbars

• First look at circulating pbars during store 4963 on Tuesday September 19th !

(average over 40 turns)

9/25/2006 All experimenters meeting A. Jansson 13

Conclusions

• Tevatron Ionization Profile Monitor see vertical injection mismatch, which can be mitigated with transfer line quad corrections.

• Should result in 5-10% smaller emittance, and corresponding increase in luminosity. May also alleviate beam-beam effect on protons.

• Still need to look at horizontal plane (need to fix tunnel hardware).

• Have seen coasting pbars, but pbar mismatch measurements (single turn) may need higher vacuum pressure.

9/25/2006 All experimenters meeting A. Jansson 14

Extra slides

9/25/2006 All experimenters meeting A. Jansson 15

100 turns

Four injection measurements superimposed

9/25/2006 All experimenters meeting A. Jansson 16

500 turns

FFT of:

First 100 turnsTurn 100-400

9/25/2006 All experimenters meeting A. Jansson 17

P150 transfer line

Plot from M. Berdnikov

9/25/2006 All experimenters meeting A. Jansson 18

Beam profile at low beta

• Proton bunch #1 at low beta during store #4758.

• Measured beam size 0.55mm, turn-by-turn variation (noise) 20µm.

• Total signal per bunch ~1.3pC.

30 turn average

single turn

Magnet at 200A

9/25/2006 All experimenters meeting A. Jansson 19

QIE card

• 8 channels (CMS QIE8) per board.

• Achieved noise ~1.8fC with 4’ cable.

• Data is combined with timing information, serialized by CERN GOL ASIC (rad hard) and sent thru optical fiber at 1.1Gbps data rate

• Timing fanout board cleans up and distributes clock and timing signals

9/25/2006 All experimenters meeting A. Jansson 20

Data buffer card

• Handles 8 incoming optical links (64 channels, 1.1 GB/s of data)

• Can sparsify data on–the-fly based on timing masks

• 512MB RAM allows for– 20.000 turns of continuous

data– 90.000 turns for 72 bunches– 6 million turns for a single

bunch

• Read out thru PCI64 bus.• Two boards are used to

handle 128 channels.

• IPM buffer board doubled as prototype for BTeV L1 data buffer.

• Considered for use in MICE experiment.

9/25/2006 All experimenters meeting A. Jansson 21

Timing card

• Produces the 15MHz (2/7 RF) QIE clock

• Decodes and transmits beamsync revolution marker + injection and trigger events

• Controls QIE settings.

396 ns (21 buckets)

p-pbar separation ~120ns

RF

2/7

9/25/2006 All experimenters meeting A. Jansson 22

Software

• Both IPMs now have new software and firmware.

• Software/Firmware still being improved.

• Vertical IPM works pretty well.

• Horizontal IPM has some hardware problems (one dead FE board, one FE board with a sync problem, several broken channels) that require an access.

NB. REAL DATA!