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May 16, 2023 113 likes •191 views

MD1388: A tiv e Halo Con trol using narro w band exitation at injetion Morales 1 , 2 Hetor Garia Brue 2 Redaelli 2 tino 2 Ro derik , Sefano , Gianlua V alen , h 2 agner 2 Xu 2 Daniel V alu , Jos hk a W , C.

SLIDE 1 MD1388: A tiv e Halo Con trol using narro w band ex itation at inje tion He tor Gar ia Morales1,2 Ro derik Bru e2 , Sefano Redaelli2 , Gianlu a V alen tino 2 , Daniel V alu h2 , Jos hk a W agner2 , C. Xu2 LHC Collimation T eam

Ro y al Hollo w a y Univ ersit y

London, Egham, UK

CERN, Genev a, Switzerland August 2, 2016

SLIDE 2 Motiv ation T esting a new te hnique for the depletion

erp

pulated

b eam tails with presen t hardw are. The study

the metho d

b e v ery b ene ial for HL-LHC to a v

spurious b eam dumps b y pro viding an a tiv e halo

trol. Narro w band ex itation Apply a narro w band ex itation using the transv erse dump er (ADT) for dieren t frequen ies to ex ite the desired amplitude.

SLIDE 3 Pro edure Previous attempts Gained exp erien e from previous MDs arried

in 2015. These tests w ere not fully

n lusiv

e. One promising ase to b e done again in this MD. Inje t 4 nominal bun hes and sta y at inje tion. Blo w up

the bun hes. (2σ ) Measure prole with wire s anners. ADT ex itation. Measure prole with wire s anners. Get rid

all but blo wn up bun h. S rap e do wn the remaining bun h to get a more a urate prole

the b eam tails. Diamond dete tor to distinguish bun h b y bun h losses. Reinje t and measure again.

SLIDE 4 Bun h s heme 4 nominal bun hes Referen e bun h (×2 ): Outside the ADT windo w. Blo wn up bun h: Inside ADT windo w, fat tails bun h to in rease monitoring signal. Witness bun h: Inside ADT windo w, nominal bun h to sho w that the

is not ae ted.

SLIDE 5 MD

erview T

time: ∼ 5 h (in luding w aiting time) (Start 8:00, Finish: 13:00). In parallel with rystal MD. Three measuremen ts arried

SLIDE 6 Preliminary results Fixed frequen y: Q ADT = 0.295 ≈ 5.5σx T w

measuremen

ts at xed ADT frequen y: Q ADT = 0.295 (5 min). W e

repro du e what w e

bserv

ed in previous MDs.

in tensit y de rease for the ex ited bun h while

ther

remained unp erturb ed. No emittan e in rease

bserv

ed. F requen y s an: Q ADT = (0.2908 →

0.2986) ≈ (4.5σx → 6σx)

One measuremen t with s an in ADT frequen y Q ADT = 0.2908 → 0.2986 .

in tensit y loss for the ex ited bun h. Small de rease (< 0.2% ) in in tensit y for witness bun h. T

e analyzed

ine.

SLIDE 7 Con lusions The MD w as arried

in parallel with the rystal

llimator

MD. W e tested again the a tiv e halo

trol using resonan t ADT ex itation. Similar s heme as the

used in previous MDs. 2 nominal witness bun hes not ae ted b y the ADT ex itation and 2 nominal bun hes under the ADT ee ts,

the blo wn up (2ε ) W e rep eated the same ase as in the 2015 MD that ga v e promising results. Fixed frequen y (Qx = 0.295 ) and ADT amplitude 0.03. In this ase the in tensit y w as de reased b y 1% while emittan e sta y ed

nstan

t and the

ther

bun hes w ere not ae ted. Detailed

analysis is

ngoing

in luding diamond dete tors data, but w e

btained

promising results using this metho d for tail depletion. The ee tiv eness

this metho d dep ends

the remaining halo p

pulation

after the ex itation whi h has to b e analyzed

from the s raping data.