Вывод протонного пучка с помощью изогнутого кристалла кремния
За время летней остановки У-70 в блоках 24 и 25 была заменена вакуумная камера укорителя. В этих блоках располагаются мишенные станции, которые обеспечивают вывод пучка в 14 канал. До замены камеры получение протонного пучка было хорошо изучено и являлось рутинной операцией. После замены координаты кристаллов изменились. Кроме того кристалл в 24 блоке пришел в негодность и был заменен на новый.
В задачу этого сеанса входит получение пучка протонов и проводка его по каналу до поляризованной мишени. Первый раз к решению этой задачи мы приступили 4 декабря. Результаты первого дня приводятся ниже
День минус два
Vchera byl fakticheski pervyi den', kogda mnogie iz nas pochuvstvovali real'noe priblizhenie seansa, kotoryi nachnetsya dlya nas 7 dekabrya. S ogon'kom rabotali ves' den' Semenov, Ukhanov, Mysnik, Khodyrev, Meschanin, Davidenko, Yakutin, Mochalov, Vasiliev. Vcherashnii den' prines nam puchok vmesto ozhidaeykh 8:00 v 18:20 - ves' den' byli nepoladki na bustere. V techenie dnya do puchka bylo sdelano sleduyuschee : - vygorel BS-225 (vo vremya!) - blok sinkhronizatsii v Seroi magistrali - i Alexei Palych razdobyl v OEA novyi blok. Pasha probuet otremontirovat' staryi, chtoby byl zapas v seanse; - obnaruzheno, chto, kogda zamenili barakhlivshii KP-49 i vernuli Davidenko ego rezinku ot trusov, na kotoroi etot blok rabotal poslednii mesyats, zabyli vernyt' na mesto vse moduli v etoi korzine. V rezyl'tate ne bylo LED-triggera (Akkuratnee nado nam rabotat'!!). Ispravili. - obnaruzheno, chto levyi (po puchku) generator LEDa ostavlen byl v samozapuske (esche raz - akkuratnee vsem nam nado rabotat' - my v bol'shom kollektive i za soboi vsegda nado smyvat'!!). Ispravili. - Posle togo, kak zarabotala DAQ i posli PEDy i LEDy, Khodyrev provel analiz i pokazal, chto imeem ~ 10 plokhikh PEDov i ~30 plokhikh LEDov (dyrki ili znacheniya <200). Meschanin i Yakutin seichas na oscillografe posmotreli vse pervye 7 schetchikov na vkhode v ADC - signaly 500-600 mV. Nasyschenie v ADC ? Izuchim segodnya. - Davidenko ves' den' s ABBoi vozilsya, no poka vse esche bezuspeshno - zamuchil virus, sozhravshii u nego na PC nuzhnuyu programmu, kotoruyu nado perenesti v chip. Prodolzhaet bit'sya s nenavistnym virusom. Na puchke byli s 18:20 do 23:30. Za eto vremya issledovali oba kristalla 24-yi i 25-yi. NA oboikh radiusakh 50 mm (5.5V na oboikh kristallakh) i 45 mm (6V na oboikh kristallakh) vo vsem diapozone uglov 20 mrad i 66 mrad protonnogo puchka ne uvideli ni na 50 GeV ni na 60 GeV. Ustoichivyi maksimum po S1S2 = 1200 protonov byl na 25-om kristalle na R=45 mm pri ugle fi = - 7.1, kogda mishen' 24/3 (uglerodnaya tkan') stoyala na R= +40. V chem delo ? Magnit M1A zhelezom stoyal na puchke ? Puchkist (13051) soobschil Yakutinu, chto magnit vyveden do kontsevika. V domike vnizu Yakutin videl goryaschuyu lamochku - vyvedeno. Vol'ty, kotorye nam zakazyval stavit' Minchenko ne sootvetstvuyut tem radiusam, na kotorye on rasschityval, i kristall dal'she stoyal ot ravnovesnoi orbity ? Letom posle zameny kamer 24 i 25 pomenyali sistemu koordinat. 24-yi kristall, k tomu zhe, novyi, tak kak staryi razbili letom. Chesnokov, kotoryi ustanavlival kristally, v Italii. V khode raboty obnaruzhili, chto u nas kollimatory byli zakryty, a bump 5/4 byl ne toi polyarnosti. Razdvinuli kollimatory na +70 i perepolyusovali 5/4 - ne pomoglo dlya kristalla, no pomoglo dlya monitora Ukhanova-Mysnika M1(M1 - eto Mysnik 1 ??). Poleznyi monitor (integrator na FEU na vykhode iz shtanov U70 v 25-om promezhutke) - on nam pokazyval vchera, est' li voobsche ryadom s kristallom v kol'tse protonnyi puchok. Edinstvennym radostnym momentom bylo blizhe k polunochi, kogda vdrug dozimetristy zavopili, chto poshli prevysheniya po 66-oi tochke (nad kanalom pod perekhodom) - znachit, puchok byl gde-to ryadom, no zavernyt' v kanal kristallom my ne smogli. Sleduyuschee uprazhnenie s uskoritel'schikami v subbotu (zavtra) s 8:00 do 20:00. Nuzny idei - kak poluchit' puchok ?
Day -1
From vasiliev_at_mx.ihep.su Tue Dec 9 05:47:27 2003
Date: Sun, 07 Dec 2003 12:25:27 GMT+03:00
From: A.N.Vasiliev
To: vasiliev_at_mx.ihep.su, davidenko_at_mx.ihep.su, mochalov_at_mx.ihep.su,
grishin_at_mx.ihep.su, minaev@fnal.gov, morozov@sirius.ihep.su, semenov_at_mx.ihep.su, ukhanov_at_mx.ihep.su, melnik@jlab.org, kravtsov@fnal.gov, nurushev_at_mx.ihep.su, mikhalin_at_mx.ihep.su, khodyrev_at_mx.ihep.su, gonchar@jlab.org, nogach_at_mx.ihep.su, shester@jlab.org, meschanin_at_mx.ihep.su, soloviev_at_mx.ihep.su, MATULENK@RCF2.RHIC.BNL.GOV, derevcht@fnal.gov
Cc: vasiliev_at_mx.ihep.su
Subject: "Day -1" na seanse
Vchera (dec 6) byl fakticheski tretii i poslednii den' pered nashim ofitsial'nym vremenem na seanse. Rabotali ves' den' te zhe : Semenov, Ukhanov, Mysnik, Khodyrev, Meschanin, Davidenko, Yakutin, Mochalov, Vasiliev.
Na pervoi polovine stola uskoritels'chiki zanimalis' medlennym vyvodom na 22-oi kanal. V etom seanse FODS - edinstvennaya ustanovka, kotoraya mozhet dat' fiziku. FODS imeet 1-yi prioritet v seanse. Fedotov i Karrshev ves' den' proveli na nastroike MV na 22-oi. S nami ves' den' rabotal tol'ko Minchenko. Na vtoroi polovine stola. Puchok byl s ~10:00 utra do ~22:00, kogda my, obessilennye, sdulis' i prekratili rabotu.
24-yi kristall mertvyi! Ni pri kakikh uglakh i razumnykh radiusakh puchka ne bylo sovsem. Ne bylo ego pri otsutstvii 27-oi misheni i s nei na r=-35. Etim kristallom v etom seanse dal'she est' smysl tol'ko togda zanimat'sya, kogda poyavitsya kakya-to yarkaya ideya. Esli zhe ne poyvitsya - nado dozhdat'sya "vskrytiya" posle seansa.
Na 25-om kristalle bez 27-oi misheni pri R=6.9V (34 mm) ~400 tys. na S1S2, no S1S2S3/S1S2 = 2%. Puchok vkhodit v kanal koso, pod bol'shim uglom k osi kanala. S pomosch'yu 18-ogo udalos' podnyat' eto otnoshenie do 10%, no schet S1S2 upal v 5 raz. S 27-oi mishen'yu S1S2 byl raz v ~5 men'she.
Chto s 25-ym ? Pochemu net puchka v kanale? Vkatili 25-yi na R=7.9V _ po otsenke Minchenko 28 mm. Stali srezat' 75% puchka s MV na 22-oi. S1S2 vyros do 10^6, a otnoshenie ostalos' 2%. Zavopili s 22-ogo, i my ot'ekhali nazad. No etim faktom znachitel'no podtverdili, chto sistema koordinat Minchenko pravil'naya, a Grishina s proshlykh seansov uzhe izmenena. Gipoteza ostaetsya, chto navedenie na 25-yi bylo nevernoe iz-za nevernogo ispol'zovaniya (nedoispol'zovaniya) bumpov. V kontse etikh 12-chasovykh muchenii Minchenko proronil : "Nado ispol'zovat' pravil'nye bumpy". Kogda vyspetsya, uznaem u nego, kakie byli bumpy i kakie on imel v vidu pod "pravil'nymi". My rabotali eti dva dnya ,4-ogo i 6-ogo, peredav initsiativu polnost'yu uskoritel'schikam. Vypolnyali ukazanie Grishina, chto upravlenie puchkom dolzho idti s SV. Upravlenie bylo, no puchka ne uvideli v kanale.
Davidenko ves' den' s ABBoi vozilsya, no poka vse esche bezuspeshno - on pobedil virus, sozhravshii u nego na PC nuzhnuyu programmu, nashel i ispravil posledovatel'no ryad oshibok v montazhe bloka, no ABBA tak i ne zarabotala. So slovami "u menya krizis zhanra" on ushel domoi v 9-om chasu vechera. Na dannyi moment ABBA ne rabotaet.
Prodolzhalis' raboty po detektoru i elektronike CHSPP. Khodyrev-Meschanin-Vasiliev zamenil tri fibera i, tem samym, ispravili tri schetchika. Zamenili ADC vo 2-oi korzine (4-e mesto), i propali bol'shie RMS v PEDakh. Perenesli ryad kanalov na 16-e mesta - pomoglo. Khorosho, chto Meschanin-Khodyrev- Yakutin-Davidenko pered seansom, zameniv paru desyatkov ADC, osvobodili vse 16-e mesta v 3-kh korzinakh. U nas est' stepeni svobody pri bor'be s defektami v ADC. PEDy v poryadke (krome 4-kh mest v 1-oi korzine - effekt propadaet i poyavlyaetsya vnov'). Po LEDam i mu-mezonam ostalis' 4 vazhnykh mertvykh schetchika. Svet v fibere v nikh est'. Nado deliteli menyat'.
Itogo : chto u nas na 7-e dekabrya, na nachalo seansa :
-------------------------------------------------------
1) protonnyi puchok v kanal cherez 25-yi kristall tak i ne popal,
24-yi kristall mertv;
2) ABBA ne rabotaet ;
3) CHSPP i elektronika v udovletvoritel'nom sostoyanii, khotya trebuyut postoyannogo vnimaniya i dovodki do luchshego sostoyaniya.
Proigryvaem poka po vazhnym faktoram seansa 1:2.
Day 1
From vasiliev_at_mx.ihep.su Tue Dec 9 05:47:54 2003
Date: Mon, 08 Dec 2003 13:34:08 GMT+03:00
From: A.N.Vasiliev
To: vasiliev_at_mx.ihep.su, davidenko_at_mx.ihep.su, mochalov_at_mx.ihep.su,
grishin_at_mx.ihep.su, minaev@fnal.gov, morozov@sirius.ihep.su,
semenov_at_mx.ihep.su, ukhanov_at_mx.ihep.su, melnik@jlab.org, kravtsov@fnal.gov,
nurushev_at_mx.ihep.su, mikhalin_at_mx.ihep.su, khodyrev_at_mx.ihep.su,
gonchar@jlab.org, nogach_at_mx.ihep.su, shester@jlab.org,
meschanin_at_mx.ihep.su, soloviev_at_mx.ihep.su, MATULENK@RCF2.RHIC.BNL.GOV,
derevcht@fnal.gov
Cc: vasiliev_at_mx.ihep.su
Subject: "Day 1" v seanse
Resent-Date: Mon, 08 Dec 2003 13:34:10 GMT+03:00
December 8, 2003 12:00
Vchera (dec 7) byl pervyi den' nashego ofitsial'nogo
vremeni na seanse. Dnem rabotali Semenov-Mochalov-Soloviev-
Prudkoglyad, a noch'yu Davidenko-Morozov-Belikov-Ponomarev.
Elektronnyi puchok my vot uzhe v techenie 28 chasov ne
poluchili ot uskoritel'cshikov. U nikh ne rabotala novaya
avtomaticheskaya (cherez PC) sistema navedeniya bampov na
vnutrennie misheni, a pod utro slomalsya lineinik. Poka
stoim do 13:00 po prognozam U70.
Davidenko noch'yu s ABBoi vozilsya, no poka vse esche
bezuspeshno. So slov Pashi u nego pri vklyuchenii/vyklyu-
chenii dvigatelya inogda po X nabrasyvaetsya chislo 200.
Eto mozhet byt' odna i ta zhe navodka s fiksirovannoi
chastotoi v fiksirovannykh vremennykh vorotakh.
s privychnymi slovami "u menya krizis zhanra" on
ushel domoi spat'. Na dannyi moment ABBA ne rabotaet -
ni v avtomaticheskom, ni v ruchnom rezhime.
Vsem smenam nado uzhe nastorozhit'sya i byt' gotovymi k
tomu, chto budem vruchnuyu rabotat' so staroi ABBoi.
Eto utomitel'no, no chto ostaetsya ? Esli u kogo est'
voprsy ili pozhelaniya po stilyu raboty po peremescheniyu
detektora - obraschaites' pryamo k Davidenko.
Prodolzhalis' raboty po detektoru i elektronike CHSPP.
Meschanin-Yakutin zamenili deliteli na 4-kh schetchikakh,
i oni zarabotali na myuonakh i na LEDakh. Posle zameny
T-162 v 1-oi korzine ADC net poka defektov "9-ogo/4-ogo
bita". Na dannyi moment vse PED i LED OK!
Itogo : chto u nas na 8-e dekabrya :
------------------------------------
1) - protonnogo puchka v kanale ne bylo;
2) - elektronnogo puchka v kanale ne bylo;
3) - ABBA ne rabotaet ;
3) + CHSPP i elektronika v rabochem sostoyanii, vse
PED i LED OK - dyr v detektore i elektronike net.
Tak kak DAQ Semenova i ON-LINE Mochalova rabotayut
nadezhno uzhe davno, to ne budem zanimat'sya pripiskami i
vklyuchat' eto v nash tekuschii aktiv. Togda :
proigryvaem poka po vazhnym faktoram seansa 1:3.
-----------------------------------------------
Day 2
From vasiliev_at_mx.ihep.su Sat Dec 13 05:34:54 2003
Date: Tue, 09 Dec 2003 10:53:25 GMT+03:00
From: A.N.Vasiliev <vasiliev_at_mx.ihep.su>
To: vasiliev_at_mx.ihep.su, davidenko_at_mx.ihep.su, mochalov_at_mx.ihep.su,
grishin_at_mx.ihep.su, minaev@fnal.gov, morozov@sirius.ihep.su,
semenov_at_mx.ihep.su, ukhanov_at_mx.ihep.su, melnik@jlab.org, kravtsov@fnal.gov,
nurushev_at_mx.ihep.su, mikhalin_at_mx.ihep.su, khodyrev_at_mx.ihep.su,
gonchar@jlab.org, nogach_at_mx.ihep.su, shester@jlab.org,
meschanin_at_mx.ihep.su, soloviev_at_mx.ihep.su, MATULENK@RCF2.RHIC.BNL.GOV,
derevcht@fnal.gov
Cc: vasiliev_at_mx.ihep.su
Subject: "Day 2" v seanse
Resent-Date: Tue, 09 Dec 2003 10:53:28 GMT+03:00
Resent-From: <ukhanov_at_mx.ihep.su>
Resent-To: <UKHANOV@RAMPEX.IHEP.SU>
December 9, 2003 10:30 a.m.
Vchera byl vtoroi den' seansa. Posle 5 smen prostoya v 16:00
nachalos' navedenie na nas. Priglasili Maisheeva. V 18:00
poluchili puchok i otpustili Maisheeva. S1S2=20,000, S1S2S3=7,000.
S1S2S3/S1S2 = 35%. Maisheev skazal, chto ran'she v luchshem sluchae
bylo 50%, no Vasya nashel po zhurnalam, chto 70%. Nas ustroil
35%-puchok. Rezhim kanala 23 GeV ne menyali, chtoby impul's
znat' i dal'she k nemu privyazyvat'sya. Pereshli k rabote na
e-puchke.
Podobrali napryazhenie CSPP 1620 V tak, chtoby na scope signaly
byli 1000 mV v otkalibrovannykh v proshlom seanse schetchikakh.
Podpravili napryazhenie generatora LEDa pod novoe HV. Postavili
staruyu ABBu, tak kak Davidenkovskaya ne rabotaet. Proverili
esche raz kontseviki na kanale i podvyazali kabeli s kamer
Rampexa. Sostavili sistemu koordinat peremescheniya ABBy.
Vystavili napryazhenie na 20 schetchikakh, na kotorykh letom i
uzhe v seanse menyali FEU ili deliteli. Na 17-ti udalos' dobit'sya
1000 mV, a na 3-kh net. Na 3023 - 500mV, na 1918 - 550 mV,
na 2707 - 1500 mV. Pasha podpravil zaderzhki v godoskopakh i
Galo schetchik vklyuchil v triggernuyu skhemu, posadiv ego
po zaderhzke na S1S2S3.
Zadacha 1 : Kalibrovka na 23 GeV v zone 12x8.
---------------------------------------------
V techenie 9-ti chasov otkalibrovali oblast' 12x8 schetchikov
(s zapasom, s uchetom poperechnykh utechek livnya), gde
budem formy livnya pri raznykh energiyakh nabirat'. Zapisali
250 Mb dannykh v faily /data/helix/1/run03-12/cspp_calib_23GeV.
Peremeschenie posle kazhdogo spilla na 100 otschetov po X
v zadannoi zone i 25 otschetov po Y, kogda dostigaetsya granitsa
zony. Vse rukami. Chelovek prikovan k pul'tu ABBA i smotrit
na zelenye pereschetki Leontieva, byl li priem v proshedshem
spille ili net. Byl - dvigaet. Rasstoyanie v odin schetchik -
eto 511 otschetov po X ili 142 otscheta po Y. V schetchike
poluchaetsya vsego ~ 7-8 tys. elektronov pri takoi rabote.
Dostatochno dlya kalibrovki.
Zadacha 2 : Forma livnya na 23 GeV bez veschestva v zone 6x5.
------------------------------------------------------------
V 10:00 nachali nabor formy livnya v zone 6x5 (vnutri zony 12x8)
na 23 GeV bez veschestva. Interesno etu formu livnya budet sravnit'
s toi, chto nabrali na PROZe bolee 20 let nazad na etom zhe
detektore. Detektor postarel za 20 let. I forma "postarela" ?
Pishem v faily /data/helix/1/run03-12/cspp_shower_23GeV.
Za spill (rabotaem na vtoroi polovine stola) zapisyvaem
~300 triggerov na disk. Tak kak formu livnya budem sgonyat' k
odnomu schetchiku, to poluchitsya ~200-250 tys. sobytii dlya
formy livnya za odin progon po zone 6x5.
Day 3
From vasiliev_at_mx.ihep.su Sat Dec 13 05:35:01 2003
Date: Wed, 10 Dec 2003 14:19:55 GMT+03:00
From: A.N.Vasiliev <vasiliev_at_mx.ihep.su>
To: vasiliev_at_mx.ihep.su, davidenko_at_mx.ihep.su, mochalov_at_mx.ihep.su,
grishin_at_mx.ihep.su, minaev@fnal.gov, morozov@sirius.ihep.su,
semenov_at_mx.ihep.su, ukhanov_at_mx.ihep.su, melnik@jlab.org, kravtsov@fnal.gov,
nurushev_at_mx.ihep.su, mikhalin_at_mx.ihep.su, khodyrev_at_mx.ihep.su,
gonchar@jlab.org, nogach_at_mx.ihep.su, shester@jlab.org,
meschanin_at_mx.ihep.su, soloviev_at_mx.ihep.su, MATULENK@RCF2.RHIC.BNL.GOV,
derevcht@fnal.gov
Cc: vasiliev_at_mx.ihep.su
Subject: "Day 3" v seanse
Resent-Date: Wed, 10 Dec 2003 14:19:58 GMT+03:00
Resent-From: <ukhanov_at_mx.ihep.su>
Resent-To: <UKHANOV@RAMPEX.IHEP.SU>
December 10, 2003, 14:00
Vchera byl tretii den' seansa. Zavershili k ~14:30
Zadachu # 2. Kstati, po otsenkam on-line sostav puchka 23 GeV:
90% - electrons, 4% - muons, 6% - pions.
Zadacha 2 : Forma livnya na 23 GeV bez veschestva v zone 6x5.
------------------------------------------------------------
V faily /data/helix/1/run03-12/cspp_shower_23GeV za 4 chasa
zapisali 100 Mb. Ranee bylo zapisano esche 250 Mb po zone
12x8 - eti dannye tozhe budut ispol'zovany dlya formy livnya
na 23 GeV bez veschestva. V summe mozhno schitat' 350 Mb.
V.A.Kormilistin k ~16:00 ustanovil v CHSPP "bolvanku STAR"
na 4 s lishnim rad.dliny. Sognav detektor na kontseviki,
my opredelili lyufty. Za sutki raboty s pul'tom ABBA na
X lyuft sostavil v summe 1.5 schetchika (~850 delenii),
a na Y 0.2 schetchika. Rekomendatsii k dal'neishei rabote :
pri progone v lyubuyu storonu po ABBe, esli proskochili
svoe znachenie, ne nado delat' popravochnykh obratnykh
dvizhenii!!
K 11:30 segodnyashnego dnya reshili zadachu # 3.
Zadacha 3 : Forma livnya na 23 GeV s veschestvom v zone 4x3.
------------------------------------------------------------
V faily /data/helix/1/run03-12/cspp_shower_23GeV_STAR za
17 chasov zapisali 500 Mb. Poterya energii v bolvanke ~20%.
U Dimy v Geante 19%. Soglasie! Posle rekomendatsii po
pol'zovaniyu pul'tom ABBA, vyskazannykh vchera ustno, lyufty
za sleduyuschie sutki umen'shilis' znachitel'no :
po X 0.4 schetchika (~200 delenii), a po Y lyufta net sovsem.
Pereshli na rezhim 9 GeV, vkatili vtoroi konvertor. Maisheeva
vyzvali. No uskoritel' sdulsya v 11:30 i s tekh por stoit
(seichas 14:15). Kak zarabotaet U70 i poluchim normal'nyi
puchok e- na 9 GeV, pereidem k zadache 4 - Forma livnya na
9 GeV s veschestvom v toi zhe zone 4x3. Vsego zhe u nas 9
zadach na e- puchke.
Day 4
From vasiliev_at_mx.ihep.su Sat Dec 13 05:35:09 2003
Date: Thu, 11 Dec 2003 07:33:20 GMT+03:00
From: A.N.Vasiliev <vasiliev_at_mx.ihep.su>
To: vasiliev_at_mx.ihep.su, davidenko_at_mx.ihep.su, mochalov_at_mx.ihep.su,
grishin_at_mx.ihep.su, minaev@fnal.gov, morozov@sirius.ihep.su,
semenov_at_mx.ihep.su, ukhanov_at_mx.ihep.su, melnik@jlab.org, kravtsov@fnal.gov,
nurushev_at_mx.ihep.su, mikhalin_at_mx.ihep.su, khodyrev_at_mx.ihep.su,
gonchar@jlab.org, nogach_at_mx.ihep.su, shester@jlab.org,
meschanin_at_mx.ihep.su, soloviev_at_mx.ihep.su, MATULENK@RCF2.RHIC.BNL.GOV,
derevcht@fnal.gov
Cc: vasiliev_at_mx.ihep.su
Subject: "Day 4" v seanse
Resent-Date: Thu, 11 Dec 2003 07:33:23 GMT+03:00
Resent-From: <ukhanov_at_mx.ihep.su>
Resent-To: <UKHANOV@RAMPEX.IHEP.SU>
December 11, 2003, 7:00
Vchera byl chetvertyi den' seansa. Posle zaversheniya zadachi # 3
pereshli na rezhim 9 GeV, vkatili vtoroi konvertor. Uskoritel'
prostoyal 7 chasov (11:30-18:30).
Kogda zarabotal U70, poluchili puchok 9 GeV, raskryv kollimatory
simmetrichno K3 na +/-15, K1 na +/- 15 i K2 na +/- 10
po otnosheniyu k rezhimu 23 GeV. Izmerili, chto tsentral'nyi
impul's v kanale s kollimatorami "a-la 23 GeV' i "a-la 9 GeV"
odin i tot zhe v predelakh 1%. Korrektiruyuschie magnity na
9 GeV vyklyucheny (na 23 GeV KMX vklyuchen na 30 delenii).
Tsentral'nyi impul's "rezhima 9 GeV" s nashim triggerom
S1S2S3*antigalo okazalsya 10 GeV/c (predpolagaya, chto predyduschii
byl 23 GeV i chto shlkala CHSPP lineina v diapozone 10-23 GeV).
Budem, odnako, nazyvat' etot puchok "puchkom 9 GeV", chtoby ne
putat'sya, tak kak rezhim vsekh elementov, nachinaya s M5
masshtabirovan k 23 GeV kak 9/23.
Antigalo imeet dyru 14 mm, S3 imeet diametr 18 mm. Otnoshenie
ploschadei 0.6. Otnoshenie schetov takzhe 0.6. To est', vo-pervykh,
puchok shirokii v raione S3, a vo-vtorykh S3 effektiven i na Antigalo
uzhe ne ostaetsya gala puchka - vse srezano uzhe S3. Antigalo
tol'ko svoei men'shei dyroi rabotaet.
V puchke 9 GeV pri raskrytykh na +/-15 kollimatorakh
S1S2= 15,000, S1S2S3=920, S1S2S3Antigalo = 550, priem v PC = 200.
pri kollimatorakh "a-la 23 GeV"
S1S2= 4100, S1S2S3=230, S1S2S3Antigalo = 140, priem v PC = 70.
S 22:00 do 4:30 s effektivnost'yu U70~65% nabirali statistiku
po zadache 4 - forma livnya na 9 GeV s veschestvom v toi zhe
zone 4x3. K 4:30 nabrali 82 Mb. Zapisali 338,000 sobytii, iz nikh
otvechayut nuzhnomu summarnomy energovydeleniyu v CHSPP 137,000
S 4:30 stoim po vakuumu. Samogo gospodina/tovarischa Lapygina
(druga Mel'nika-Shestermanova po velosipednym zabegam i politicheskim
sporam do khripoty i obid) vydernuli iz teploi krovatki, no tishina -
prognozov net. Ne zasnul li on v kol'tse ?!
V pervoi polovine segodnyashnego dnya Misha Ukhanov i K* s kranom
zaimutsya peremescheniem Rampex-ECAL. V eto vremya (nezavisimo ot
nabrannoi statistiki) Kormilitsinu nado budet ubrat' bolvanku STAR.
Pereidem na sleduyuschuyu zadachu # 5 - forma na 9 GeV s HV = 1620V
bez veschestva, a zatem podnimem HV do 1800V i zaimemsya do
utra pyatnisty zadachei # 6 - kalibrovka 1/2 CHSPP na 9 GeV.
Tak kak my prostoyali pervye 5 smen namertvo (7 dec 8:00 -
8 dec 16:00), to zhelatel'no nam porabotat' do subboty do
16:00, nabrav za eto vremya formy livnya na 9 GeV (zadacha 7),
3 GeV (zadacha 8) i 6 GeV (zadacha 9) dlya Prozy - vse pri
rabochem HV = 1800 V. A zatem by istoskovavshiesya po puchku
rampexovtsy navalilis' na ECAL, a prozisty nemnogo pereveli
by dukh i dali CHSPP peredyshku.
Day 5
From vasiliev_at_mx.ihep.su Sat Dec 13 05:35:17 2003
Date: Fri, 12 Dec 2003 12:44:50 GMT+03:00
From: A.N.Vasiliev <vasiliev_at_mx.ihep.su>
To: vasiliev_at_mx.ihep.su, davidenko_at_mx.ihep.su, mochalov_at_mx.ihep.su,
grishin_at_mx.ihep.su, minaev@fnal.gov, morozov@sirius.ihep.su,
semenov_at_mx.ihep.su, ukhanov_at_mx.ihep.su, melnik@jlab.org, kravtsov@fnal.gov,
nurushev_at_mx.ihep.su, mikhalin_at_mx.ihep.su, khodyrev_at_mx.ihep.su,
gonchar@jlab.org, nogach_at_mx.ihep.su, shester@jlab.org,
meschanin_at_mx.ihep.su, soloviev_at_mx.ihep.su, MATULENK@RCF2.RHIC.BNL.GOV,
derevcht@fnal.gov
Cc: vasiliev_at_mx.ihep.su
Subject: "day 5" v seanse
Resent-Date: Fri, 12 Dec 2003 12:44:51 GMT+03:00
Resent-From: <ukhanov_at_mx.ihep.su>
Resent-To: <UKHANOV@RAMPEX.IHEP.SU>
December 12, 2003, 12:00
Vchera byl pyatyi den' seansa. Pozadi 20 iz 44 smen seansa.
Zadachu 4 (forma livnya na 9 GeV s veschestvom) zavershili
v 9:00 vchera - brigada Mishi zanyalas' ECAL. Vsego v zadache
4 nabrano 100 Mb dannykh. Zapisano 394,000 sobytii, iz nikh
poleznykh 165,000 tak kak v 9 gev puchke tol'ko 40% elektrony.
Ostal'noe - muony i piony.
Posle etogo snyali HV s CSPP, Kormilitsin ubral STAR-bolvanku,
vklyuchili HV=1620 obratno. NAchalsya poslednii etap programmy
na elektronakh - PROZA. Sognali po X na kontsevik - lyuft po X
sostavil uzhe vsego 93 otscheta ili 0.18 schetchika. Prostoyali
po uskoritelyu do 18:00. Dnem zamenili BS-225 - on daval zavisanie
ESPILL signala.
Zatem v techenie 4-kh chasov vypolnili zadachu 5 (32 Mb dannykh) -
forma livnya na 9 Gev bez veschestva pri HV=1620V.
V 23:00 11 dek pereshli na CHSPP na HV=1800V. Podobrali napryazhenie
na generatore LEDa tak, chtoby vse LEDy byli OK. K polunochi nachali
zadachu 6 - kalibrovka 1/2 CSPP na 9 Gev pri HV = 1800V dlya
PROZy. V nastoyaschii moment kalibrovka prodolzhaetsya. Nabrano 110 Mb
dannykh. Iz ~400 schetchikov CHSPP-720, kotorye nado otkalibrovat',
otkalibrovano ~60, to est' 15%. Shli po 2 spilla na tochku. Uskorimsya.
Pereshli na 1 spill na tochku.
Iz pervykh 20 smen nashego vremeni prostoi uskoritelya sostavili, kak
minimum, 8.5 smen (podrobnye raschety v zhurnale PROZA-4 na str.36).
To est', real'no my kak by 11.5 smen na puchke. Po nashei programme
seansa na elektronakh my vypolnili Etap 1 - Podgotovka, Etap 2 - STAR
i pervuyu zadachu v poslednem Etap 3 - PROZA. K utru my ~ 1 smenu
zanimalis' zadachei 6. Na vse eto u nas bylo zaplanirovano 11 smen.
To est', my idem po planu. No nam esche nado 9 smen, chtoby vypolnit'
programmu na elektronakh. A vsego ostalos' 24 smeny seansa rampex/proza.