Future LP works

2009/09/02Manabu Togawa

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Future LP work• RUN9 analysis (200 & 500 GeV)– Offline analysis & scaler analysis

• For future run– Operation• ZDC/SMD operation

– Upgrade of scaler mode• Independent operation w/o PHENIX DAQ• SMD scaler : Add

– Charge veto info.– ZDC energy info. – BBC hit info.

• Make BBC scaler ?2

RUN9 analysis• We could use scaler data and offline analysis data

which are produced by production.– Outputs are LR and UD asymmetries.

Many thanks for Ruizhe to implement LP analyzer on production.

• Details are described in https://www.phenix.bnl.gov/WWW/p/draft/togawa/run9/localpol_run9_operation.pdf (pptx)

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Future : upgrade for SMD scaler• Independent operation – Currently ZDC (any?) LL1 needs BB GTM start;

SMD scaler needs to BB GTM start.– It could be independent (GL1 GTM always running)

• Add charge veto and/or ZDC energy information.– Need to consider small AN at beginning of fill.–While very stable at √ s = 200 GeV data.

4Fill#10364 Fill#10325

Possible thought of small AN

• Beam orbits– Colliding with finite crossing angle

• Double collision– Check rate dependent (using BBC)

• Background– Check rate dependent (using BG counters)

Detector(ZDC,SMD) FEM DAQ

LL1FPGA

ADC, TDCCharge

SMD : Make hit map according to the energy deposit above 20 MIP

TriggerZDC info.

SMD info.via fiber

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Need to monitor

Need to reduce

BBC

CV

Add :Could reduce BG

Correlation with BG counters

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Fill#10300

Unknownincrease

Unknownincrease

Inserted “blue V0” collimator

Inserted any collimator ?

Need to reduce

Fill#10450 (3/28 21:40 – 3/29 5:50)

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Change at here significantly10×10-4 12×10-4

Change at here significantly-8×10-4 -4×10-4

Yellow LR asymmetry

Residual transverse components are significantly changed during this fill.

CNI measurements were :3/28 20:53 37.4±3.0 %3/29 00:01 37.6±1.9 %3/29 03:00 36.4±3.0 %

Yellow UD asymmetry

Waldo’s comment :Automatic orbit correction was not working in fill 10450.• The horiz orb showed a two clear states, but vert drifted.

Need to monitor

Will make BBC scaler ?• Luminosity 62 : 200 : 500 = same rate (roughly)• Cross section at BBC 62 : 200 : 500 = 14 : 24 : 30 (mb)

– 62& 200 : Analysis note 688 500 : Amaresh’s presentation at W meeting (2009/06/12)

• ZDCN|S ratio relative to BBC 62 : 200 : 500 = 24 : 36 : 67• Total count rate for ZDCN|S 62 : 200 : 500 = 1 : 8 : 48• Total AN/∆AN 62 : 200 : 500 = 1 : 9 : 42

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√ s BBCLL1(NoVtx)

ZDCN|S

62 13.5 kHz 3.3 kHz (24%)200 171 kHz 62 kHz (36%)500 859 kHz 573 kHz (67%)

AN 62 : 200 : 500 ~ 2 : 6 : 12 (%)

Typical rate for ZDCN|S relative to BBC

Estimation for scaler• Total AN/∆AN 62 : 200 : 500 = 1 : 9 : 42– 62 GeV 1 s / point (5 mins) 3 s / 45 mins.– In addition, BG from charged particles are very high.

• From pythia simulation, only 14% is neutron while ~25-33% for 200 and 500 GeV (with 5 GeV threshold).

* Need to consider polarization, rate.

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500 GeV : ~50 s / point (5 mins.) 200 GeV : ~10 s / point (5 mins.)

Charged particles AN at PHENIX BBC in √ s = 200 GeV• Analysis done by Kazuya :

https://www.phenix.bnl.gov/WWW/p/draft/aoki/meetings/run6/aoki-bbcLP-20060612.ppt

• It will achieved 5 s measurement / hour will be cross check

BLUEFORWARD

YELLOWFORWARD

1-LR 2-LR 3-LR 4-LR

Fit func: p0 x cos( x – p1)

Divided by pol.(pol ~50%)

Possibilities• Use BB FEM out– BB FEM has TDC1 out

put in front– Some of them now are

used for BBC-MPC coin. Scaler.

– Just put all out to scaler• Via logic unit??

• Same as SMD scaler– Hit information is sent via

fiber to LL1.– Scaler will make on BBC

LL1 board same as SMD board

– Current BB LL1 is not re-programable.

– New BB board for multi. collision logic has possibility ??• No decision to make new one

so far… 11

Thank you so much!

• Have a good LP !!!

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backup

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BBC PMTs

Left Right

BBC PMTs3

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1-L 1-R

2-L

2-RExclusive asym

(1-L) && !(1-R) VS!(1-L) && (1-R)

Used fills(runs)FILL(RUN) BBLL1

(run)205189 5.45M

8016 3.79M

8021 2.91M

8022 7.77M