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Data Collection RTD720 scope and RR wall current monitor and R86 ( by Ming-Jen)

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{. With protons. RR pbar Longitudinal Emittance during Beam Stacking and Unstacking and Some Issues Chandra Bhat MI/RR Group February 12, 2003. Data Collection RTD720 scope and RR wall current monitor and R86 ( by Ming-Jen)

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slide1

{

With

protons

RR pbar Longitudinal Emittance during Beam Stacking and Unstackingand Some IssuesChandra Bhat MI/RR GroupFebruary12, 2003
  • Data Collection
    • RTD720 scope and RR wall current monitor

and R86 ( by Ming-Jen)

    • A TCLK event for multiple triggers in sequence

(by Craig McClure and Greg Vogel)

  • Case Studied
    • Pbar Stacking
    • Pbar Un-stacking
    • De-bunching and Re-bunching in 2.5 MHz rf buckets
    • Compression and De-compression
  • Issues
dedicated variable event
Dedicated Variable Event

A new TCLK event

E6 is allotted for this

purpose for future usage

four different timing during stacking

el =88eVs

DE/E=0.13%

el =81eVs

DE/E=0.23%

el =14.5eVs

DE/E=0.27%

el =64eVs

DE/E=0.29%

el =78.5eVs

el =13eVs

el =64eVs

DE/E=0.29%

el =77eVs

Four Different Timing during Stacking
three different timing during un stacking

el > 13.7eVs

el = 29eVs

DE/E=0.31%

el >42.7eVs

(26bkts)

(85bkts)

el = 15eVs

DE/E=0.1%

el = 29eVs

DE/E=0.31%

el = 44eVs

(26bkts)

(85bkts)

el = 46eVs

DE/E=0.33%

(52bkts)

Three Different Timing during Un-stacking
pbar un stacking rr mi transfer 5 january 8 2003

el = 17eVs

DE/E=0.30%

el >13.7eVs

el >30.7eVs

el = 11.5eVs

DE/E=0.26%

el =28.5eVs

el = 29eVs

DE/E=0.31%

Pbar Un-stacking(RRMI Transfer 5, January 8, 2003)
de bunching and re bunching in 2 5 mhz rf buckets

= 85bkts

V=2kV

De-bunching time = 20 sec

Hold off time = 8 sec

Re-bunching time = 20 sec

= 48bkts

Before de-bunching

De-bunched

After re-bunching

De-bunching and Re-bunching in 2.5 MHz rf buckets
de bunching and re bunching in 2 5 mhz rf buckets continued

= 85bkts

V=2kV

V=1.4kV

De-bunching time = 3 sec

Hold off time = 8 sec

Re-bunching time = 3 sec

= 48bkts

Before de-bunching ; el = 4.8eVs

De-bunched

After re-bunching ; el = 6.2eVs

Conclusions :

Emittance Growth ~30%

De-bunching and Re-bunching in 2.5 MHz rf buckets(continued)
de bunching and re bunching in 2 5 mhz rf buckets continued1

= 85bkts

V=2kV

V=1.4kV

De-bunching time = 20 sec

Hold off time = 8 sec

Re-bunching time = 20 sec

= 48bkts

Before de-bunching ; el = 5.5 eVs

De-bunched

After re-bunching ; el = 8.0 eVs

Conclusions :

Emittance Growth ~ 45%

De-bunching and Re-bunching in 2.5 MHz rf buckets(continued)
esme simulations of de bunching and re bunching in 2 5 mhz rf buckets

At Injection

After Re-bunching

De-bunching time = 3 sec

Hold of time = 2sec

Re-bunching time = 3 sec

ESME Simulations of De-bunching and Re-bunching in 2.5 MHz rf buckets
some issues
Some Issues
  • The data have been analyzed using a primitive (but accurate) method. We need to automatize this. We need this information on every transfer  This is a lots of work (we are working on it)
  • By integrating the area and calibrating it with I:RBEAM we can measure beam intensity on each transfer
  • We see systematic difference in emittance from sequence to sequence during stacking and un-stacking of pbars, which is indicative of emittance dilution. This needs more study. This can be done using protons
  • At present the stacking and un-stacking sequences are about 100 sec long. This has impact on collider operation. We should revisit them and optimize.
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